Ratio Of Cellulose Research Articles

Research on the effect of the ratio of beeswax, palm wax,and carboxymethyl cellulose (MW-CMC) on the physicochemical properties of film-forming preparation and the ability to preserve purple passion fruits

Research on the effect of the ratio of beeswax, palm wax,and carboxymethyl cellulose (MW-CMC) on the physicochemical properties of film-forming preparation and the ability to preserve purple passion fruits

Major moisture shifts in inland Northeast Asia during the last millennium

Abstract Previous paleoenvironmental data synthesis indicates that arid central Asia (“westerlies Asia”) and mid-latitude East Asia (“monsoonal Asia”) show anti-phased moisture variations over the last millennium. However, there are very few records from inland Northeast Asia, which obscures the spatial extent of or the boundary between the two domains and hinders the assessment of climate change impacts and consequences across the region. Here, we present a multi-proxy record that combines peat properties, plant macrofossils, and isotopic ratios of Sphagnum moss cellulose from a unique precipitation-fed peatland in northern Northeast China to fill this critical data gap. The results show major centennial-scale moisture anomalies at this site, with drier and wetter conditions during the Medieval Warm Period and Little Ice Age, respectively, which resemble the pattern of moisture changes in “westerlies Asia”. During the period of rapid anthropogenic warming, the site is much drier, with isotopic evidence for threshold-like summer desiccation of peat-forming Sphagnum mosses. This study provides the long-term context and identifies the large-scale pattern of moisture variability in an inland region home to carbon-rich peatlands, forests, and permafrost soils, and highlights their potential vulnerability to future warming-enhanced drying that can be transmitted widely through atmospheric teleconnection.

Important role of cellulose and lignin in controlling the crystal structure of iron-carbon composite: Fe3C surpassing Fe0 in activating peroxymonosulfate

The mechanism of producing iron-carbon composites with different crystal structures by varied wood-based biomass remains unclear. Herein, cellulose and lignin as the important components of wood-based biomass were used to investigate the influence on the crystal structure of iron-carbon composites. Results showed that Fe3C could only be produced in cellulose-containing pyrolysis processes, while the pyrolysis of lignin could reduce the iron salt to Fe0. Additionally, prolonging pyrolysis time and increasing the ratio of cellulose to Fe also favored the production of Fe3C. When applied to activate peroxymonosulfate (PMS), the Fe@Cel0.5-4 typically dominated by Fe3C showed better performance than Fe@Ln1.0-4 which was dominated by Fe0 in the aspects of adsorption, electron transfer, retaining the iron species, sustainability, adaptability to complex water conditions, and the catalytic capability to degrade diclofenac (DCF). Quenching experiments and electron spin resonance results indicated the presence of free radicals (OH, SO4−, SO5− and O2−) and non-radical (1O2 and electron transfer process) pathways in both processes. However, the degradation of DCF in Fe@Cel0.5-4/PMS process was mainly dominated by 1O2 and electron transfer while was contributed by radical and nonradical pathways almost equally in Fe@Ln1.0-4/PMS process. This study may cast some light on the development of iron-carbon composites using wood-based biomass as the carbon source to synthesize the highly efficient catalyst for PMS activation.

Saccharification of Different Delignified Sawdust Masses from Various Trees Along the Lagos Lagoon in Nigeria

Sawdust, a major waste product of the forestry industry, is accumulating along the Lagos Lagoon in Lagos, Nigeria, without it being effectively managed. Besides its use in The saccharification of sawdust could contribute to the development of renewable energy sources and feedstock for bioproduct development. The process is, however, not that straightforward as variables such as the type of cellulase enzyme, pretreatment of the cellulose substrate, and optimizing of cellulase to cellulose ratio are a few that need to be optimized for the process to be effective in terms of glucose production.manufacturing sound-absorbing boards to reinforce concrete beams and for energy purposes, its potential as a renewable energy source and feedstock for bio-product development has not yet been realized. Cellulose, a glucose biopolymer and structural component of cellulose can be hydrolyzed by a hydrolytic enzyme known as cellulase. During the process, the enzyme breaks the B-1,4-glucosidic bond, which keeps the glucose units together, and by acting on this bond, numerous glucose units are released. As part of sawdust, the cellulose molecule is not freely available for the degradation action of the cellulase enzyme as it is strongly associated with lignin, which acts as bio-glue, keeping cellulose and hemicellulose together. Delignification is an effective technique that was used to make the sawdust from ten different trees along the Lagos Lagoon in Nigeria more susceptible to saccharification by cellulase isolated from the fungus Aspergillus niger. Delignified and non-delignified sawdust masses between 2 mg and 10 mg were incubated with the A. niger cellulase solution (2 mg.mL-1), whereafter, the amount of sugar produced by the cellulase action was determined. The percentage saccharification of each sawdust material was also linked with the amount of sugar produced during cellulase action. From these investigations was concluded that delignification increased sugar production when almost all the masses of different sawdust materials were degraded. It was also observed that the ratio of sawdust mass to enzyme concentration is an important variable that influences the effectiveness of the saccharification process. The percentage saccharification of the various sawdust materials was also determined, and it indicated that the highest percentage of saccharification was not obtained when the highest amount of sawdust was degraded, producing the highest amount of sugar.

Effect of Microbial Degradation Treatments on Lignocellulose, Cellulose, and Water-Holding Capacity of Four Typical Forest Fuels from Northeast China

Since forest fuel decomposes slowly and increases the risk of forest fires by accumulating over the years, forest fuel management to accelerate the decomposition process is essential to prevent forest fires and protect forest resources. In this study, we conducted experiments on forest fuels (Pinus sylvestris var. mongholica, Larix gmelinii, Quercus mongolica and Fraxinus mandshurica) in four typical plantation forests in northeast China by adding Trichoderma spp. to investigate the decomposition process and the changes in cellulose, hemicellulose and the water-holding capacity of the fuels. The addition of Trichoderma spp. accelerated the decomposition of cellulose, hemicellulose and lignin in the fuel. Trichoderma spp. promoted the ratio of water absorption and loss, as well as the water-holding capacity of the fuels. The ratio of water absorption and loss reached equilibrium when the decomposition time was up to 35 days, and the addition of Trichoderma spp. increased the maximal water-holding capacity of the fuel. The residual ratio of the four types of fuel degraded by the different treatments was inversely proportional to their maximal water-holding capacities and to the residual ratios of cellulose, hemicellulose and lignin. The residual ratios of degradation of the four fuels under different treatments were linearly related to their maximum water-holding capacity, cellulose, hemicellulose and lignin residual ratios. Trichoderma spp. had a positive effect on the degradation effect and water-holding capacity of fuel on the ground surface of four typical plantation forests. The study is of positive significance for the decomposition of fuel in forests, it promotes the development of biological fire prevention technology and provides a basis for the reinforcement of the management of fuel in forests and the protection of forest resources.

Fabrication and Characterization of Andrographolide-loaded Microsponges to Enhance Oral Bioavailability of Drug against Colon Cancer Using HT29 Cells

Background: The current research aimed to determine ways to improve the bioavailability of andrographolide (AGP) for use in colon cancer treatment by developing and evaluating microsponges loaded with the drug. Methods: Utilising the quasi-emulsion solvent diffusion approach, microsponges containing AGP were synthesised. A total of ten formulations were prepared using different concentrations of drug, polymer and other excipients. Particle size, shape, and differential scanning calorimetry (DSC) were used to characterise the microsponges that were created. To find out the rate at which the microsponges would expel their contents, researchers measured their release dynamics. In vitro anticancer activity of formulation was determined using HT29 cells Results: Results showed that the percentage yield of the formulations ranged from 10.85-41.03%. The highest drug concentration was achieved in formulation F8 with a particle size of 33.7 nm. SEM analysis demonstrated that the particles were round and possessed a rough and porous surface. Increasing the ratio of ethyl cellulose to AGP reduces surface roughness. The microsponge's DSC difractogram reveals prominent peaks at 18°, 24°, and 38° (2 θ) with reduced intensity, suggesting that the microsponges' crystalline character has diminished. In vitro drug release study showed 93.85% release upto 12 hours. Mathematical models showed normal release of the formulations with “n” values greater than 0.90 of all the formulations. Formulation F8 decreased the HT-29 cells' ability to survive. The percentage of cell cytotoxicity was 75.54 at 100μg/ml. Since AGP microsponges had a detrimental effect on the survival of colorectal cancer cells. Conclusion: It can be concluded from the study that prepared formulations possess anticancer properties against cancerous cells and can be used as an alternative anticancer drug.

Statistical Design Approach for the Formulation And Optimization of Nanosponges Using Poorly Water-soluble Candidate.

Nanosponges are one of the most innovative ways to use the newest developments in nanodrugs delivery. Nanosponges can catch drugs that dissolve in water or ones that don't. This work uses statistical design to find the best nanosponges for drugs that don't dissolve easily and make them. It was looked into how to statistically make the most of the effects of independent factors. The ethyl cellulose ratio and stirring rate were chosen based on how they affected the dependent variables, such as particle size and how well they were trapped. FTIR, SEM, zeta potential, entrapment efficiency, and particle size data were used to test the nanosponges that were made. Using carbopol, the best lot of nanosponges was added to the gel. Using ethyl cellulose and polyvinyl alcohol as stabilizers in the emulsion liquid diffusion method, it was possible to make drug-loaded nanosponges. It was possible to make the nanosponges composition work better by using Central Composite Design. It has been seen that making drug-filled nanosponges improves stability. The study showcased the enhanced capacity of a formulation with decreased particle size and high entrapment efficiency to disseminate effectively.

Optimized Design of Material Preparation for Cotton Linters-Based Carbon Black Dispersion Stabilizers Based on Response Surface Methodology.

Carbon black particles possess dimensions on the nanometer or sub-nanometer scale. When utilized, these particles have a tendency to aggregate, which compromises their stability under storage conditions. To address this issue, a dispersant was prepared using cotton short fibers as raw materials through etherification and graft polymerization with acrylamide (AM) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) as raw materials. The dispersant was then used to disperse carbon black to test its dispersing performance. A response surface optimization test was utilized to ascertain the influence of AMPS monomer mass, AM monomer mass, and potassium persulfate (KPS) initiator mass on the dispersibility of carbon black during dispersant preparation, and a set of optimal preparation conditions were obtained. The dispersion stability of carbon black in water was assessed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), elemental analysis (EA), thermogravimetric analysis (TG), zeta potential analysis, high magnification scanning electron microscopy (SEM), and contact angle measurements. Results revealed that the optimum mass ratio of carboxymethyl cellulose (CMC) to AMPS to AM was 1:0.69:1.67, with the KPS initiator comprising 1.56% of the total monomer mass. By incorporating the dispersant at a concentration of 37.50%, the particle size of carbon black particles was observed to decrease from 5.350 μm to 0.255 μm, and no agglomeration of carbon black particles occurred even after 3 weeks of storage.

Development, optimization, and in-vivo bioavailability study of erlotinib hydrochloride loaded microsponge for colon targeting

The present investigation aimed to develop as well as optimize microsponge containing erlotinib hydrochloride (ETB) that was composed of ethyl cellulose (EC) and pectin. The water solubility and enzymatic susceptibility make it easier to fabricate the microsponge formulation. The ETB loaded microsponge was manufactured using quasi-emulsion solvent diffusion process. By this technique, organic solution of the primary component is emulsified with stabilizing agents that are soluble in water. To design the formation of the microsponge, 32 factorial design was implemented. It was investigated how the response variables like particle dimension, entrapment efficiency, ETB diffusion at 12 ​h were influenced by independent variables such as rotation speed and the pectin to ethyl cellulose ratio. The optimal microsponge formulation loaded with ETB (F0) composed of 1:2.8 ratio of pectin to ethyl cellulose (EC) with stirring rate at 478 ​rpm. Particle dimension, entrapment efficiency, and ETB release at 12 ​h from optimized formulation were shown 104.89 ​± ​0.62 ​nm, 82.36 ​± ​2.85 ​%, and 85.49 ​± ​1.84 ​% respectively. The In-vivo pharmacokinetic study conducted on rabbit model shows a significant improvement in bioavailability. The optimized microsponge formulation has been found to have a higher Cmax than the ETB aqueous suspension. The stability of the formulation has been determined by the accelerated stability study of optimized microsponge formulation. This study indicated that the optimized formulation retained its stability even after 90days. In general, the present investigation demonstrated that drug loaded microsponge based formulation is a suitable method to improve the therapeutic efficacy and bioavailability of ETB.

Preparation and application of cattail residue-based magnetic cellulose composites for tetracycline antibiotics adsorption

Tetracycline antibiotics (TCs) are widely present in wastewater and surface water due to their extensive use. Removal of TCs from water is urgent. In this study, magnetic cellulose (MC) composites were prepared from cattail residues to adsorb oxytetracycline hydrochloride (OTC·HCl), chlortetracycline hydrochloride (CTC·HCl), and tetracycline hydrochloride (TC·HCl) from water. The influence of Fe3O4 content on the antibiotics removal was studied. The synthesized MC composites were characterized using FTIR, XPS, zeta potential, SEM, and XRD. Adsorption mechanisms and characteristics were explored using classic isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models) and common kinetic models (pseudo-first-order, pseudo-second-order, Elovich and Intraparticle diffusion models). Optimum adsorption capacity was achieved by MC2–1 (mass ratio of cellulose to Fe3O4 was 2:1), with a larger specific surface area (18.24 m2 g−1) and mesoporous structure. The adsorption processes were well described by the pseudo-second-order and Langmuir models. MC2–1 demonstrated maximum adsorption capacities of CTC·HCl (194.29 mg g−1), OTC·HCl (168.25 mg g−1), and TC·HCl (41.10 mg g−1). The results of models fitting and characterizations of the MC composites before and after the adsorption processes revealed that the main adsorption mechanisms were pore filling, hydrogen bonding, electrostatic interactions, and metal complexation. This study proposes a practical approach for utilizing wetland plant residues as an effective adsorbent for tetracycline antibiotics removal.

Ibuprofen Release from Poly(L-Lactic Acid)/Cellulose Blend Tablets: Box-Behnken Design for Optimization of the Influenced Parameters

According to the literature, blending PLA with cellulose, a natural polymer, can improve their use in the field of drug delivery systems. This work aimed to prepare a ternary mixture of ibuprofen, poly(L-lactic acid) (PLLA), and cellulose by the physical mixing method and to determine the effect of three selected factors (PLLA/cellulose blend ratio, percentage of the blend, and time of contact) on the amount of IBF released as a function of time. A Box-Behnken experimental design created using Minitab 17 software was used to study and optimize the selected factors. The percentage of IBF released significantly decreased with increasing PLLA/cellulose blend ratio (X1) and percentage of blend (X2). No significant interactions between the three factors were observed for Y1 (30 minutes), Y2 (60 minutes), and Y3 (120 minutes). A significant interaction between the PLLA/ cellulose ratio and the percentage of the blend was observed only for Y4 (180 minutes). ANOVA revealed that the refined mathematical model equations for Y1, Y3, and Y4 were more adequate than Y2 to explain the investigated total variations

Formulation Optimization and Evaluation of Herbal Films Containing Ethanol Leaves Extract of Cassia auriculata to Treat Chronic Constipation Disorder

An intriguing trend in recent years has been the designing of oral films containing extracts from medicinal plants. Therefore, efforts were made in the current work to create fast-dissolving herbal films using Cassia auriculata ethanol leaf extract in order to create a dosage form that would be more convenient to administer and treat chronic constipation disorders in the elderly. Varying ratios of hydroxy propyl methyl cellulose as polymer, propylene glycol as film softener, and a solvent-casting approach were utilized to create the quickly dissolving herbal films of C. auriculata leaf extract. A number of quality control measures, including weight fluctuation, thickness variation, surface pH, percentage moisture uptake, percentage moisture loss, disintegration time and folding endurance, were assessed. According to the findings, every film had a decent appearance, a smooth texture, was free of particle matter, and had excellent folding endurance. According to a content uniformity analysis, the drug is dispersed evenly across the entire film, and each one dissolves in less than 95 seconds. In-vitro dissolving studies using Paddle type apparatus in pH 6.8 phosphate buffer pH 6.8, which is simulated saliva, were performed for each film composition. Out of all nine formulations, formulation F5, which is an herbal film with 10% propylene glycol and 40% HPMC, exhibited complete drug release (99.6%) in 30 minutes and had a strong folding endurance value. The release of medication from films was found to follow a first-order kinetics. Overall, studies indicate that the most feasible dose form that can be used in medical settings for the treatment of chronic constipation disorder is fast-dissolving herbal films containing C. auriculata leaves extract. This is especially true for patients who have difficulty swallowing.

Fabrication of biocarbon catalyst for ORR by modulating the cellulose fraction of wheat stalk

Direct Methanol fuel cells (DMFC) have been limited in their utilization due to their slow cathodic oxygen reduction reaction (ORR) kinetics and the expensive cost of commercial Pt/C catalysts. It is critical to design an oxygen reduction process with high-efficiency catalysts. An approach for modulating the ratio of cellulose, hemicellulose, and lignin in the wheat stalk (WS)/wheat stalk binder (WS binder) precursor materials is proposed in this work. WS binder from alkalization and hydrothermal treatment was added to the WS to change the structure and shape of WS-based carbon materials by varying the ratios, which increased the ORR catalytic activity. The half-wave potential (E1/2) of the produced carbon material (15 wt% N/C (WS)) is 0.76 V, which was enhanced by 80 mV by adjusting the ratio of the WS/WS binder compared to 0 wt% N/C(WS). The E1/2 of 15 wt% Fe–N/C (WS) (0.85 V) was greater than that of commercial Pt/C (0.84 V). Besides, its catalytic oxygen reduction process was close to the 4-electron transfer pathway and had good methanol tolerance. The power density obtained with a cathode catalyst of 15 wt% Fe–N/C (WS) for DMFC was 1.39 mW cm−2 at 30 °C and 3.33 mW cm−2 at 60 °C. At different temperatures, the power densities were 1.59 and 1.54 times greater than those of commercial Pt/C catalysts, respectively.

Synthesis and characterization of composite membranes based on bacterial cellulose and coral powder

Preparation of bacterial cellulose and coral powder composite membranes has been carried out. Composite membranes were made by mixing bacterial cellulose with coral powder at different mass ratios at temperatures of 25 ºC, 40 ºC, 60 ºC and At 80 ºC, the composite membrane was evaluated for Fourier Transformation of Infrared, X-Ray Diffraction, degree of swelling, proton conductivity and methanol permeability. From the FT-IR analysis it was found that in the absorption area around 1461.385 – 911cm-1 showing the Si-O-Si stretching functional group, and in the absorption area around 3000 - 3500 cm-1 showing the (O-H) group which shows the semicrystalline composite membrane for each mass variation, according to the results of X-Ray Diffraction. The maximum proton conductivity has been measured as 3.32 x 10-3 S.cm-1 at 60°C, produces a degree of swelling of 31.14% and methanol permeability of 3.72 × 10-9 mol/cm.s for a mass ratio of bacterial cellulose:coral powder composite membrane 4:1.

Advanced Fabrication and Characterization of Hydrothermal Responsive Fabric from Microcrystalline Cellulose-Reinforced Shape Memory Polyurethane Filament

Demands for smart textiles have recently increased quickly in terms of functionality and responsiveness to wearers and environmental changes. This paper explores the development of hydrothermal responsive shape memory woven fabric from Microcrystalline Cellulose Reinforced Shape Memory Polyurethane Microcomposite Filament. The concentration of microcrystalline cellulose and drawing ratio of the filaments were first optimized according to the tensile strength and shape recovery ratio and taken as 15 wt% and 2.0 respectively. Hydrothermal responsive shape memory micro-composite filaments were then produced from shape memory polyurethane (SMPU) and microcrystalline cellulose (MCC) with optimized concentration and draw ratio by wet spinning process. The physical, mechanical, thermal and shape memory performances of the filaments were studied. The optimized filament was found to have a tensile strength of 0.91 cN/dtex and elongation of 385.2% in which the strength is much more improved when compared to a pure SMPU filament of strength 0.72 cN/dtex. The shape fixity and shape recovery results of the micro-composite filament were found to be 71.2% and 93.6% respectively. A woven fabric was manufactured from pure polyester, cotton as warp and SMPU-MCC filaments as weft and its breathability and shape memory properties were investigated. The air permeability of SMPU-PE fabrics was found to be 172.9 mm/s and 155.1 mm/s in its fixed temporary shape and recovered shape respectively. The water vapour permeability of SMPU-CT fabric was found to be 612.01 g/m2.h and 540.28 g/m2.h in its fixed temporary and recovered shape respectively which shows smart breathable fabrics can be made and adopted with enhanced properties.

Preparing robust superhydrophobic porous coatings on rough substrates

Superhydrophobic surfaces have attracted wide attention due to their excellent waterproof performance. However, the micro-nano structural superhydrophobic surfaces are always fragile due to the poor mechanical stability. We demonstrate robust superhydrophobic surfaces with fine mechanical stability by spraying superhydrophobic coatings on rough substrates. Compared with the superhydrophobic coatings on smooth substrates (SCSS), the superhydrophobic coatings on rough substrates (SCRS) exhibit better mechanical durability because that the microstructures of the rough substrates can effectively protect superhydrophobic coatings from being destroyed under external force. The water contact angles (WCAs) of the SCRSs maintain at 152.1° ± 1.2° after 100 g sand scouring and at 139.5° ± 3.1° after 1000 g sand scouring, while the corresponding WCAs of the SCSSs will drop to 131.8° ± 2.2° and 102.6° ± 5.8°, respectively. Meanwhile, the influence of spraying process parameters on coating morphology, thickness, hydrophobicity and durability has been studied. The ratio of TiO2 and ethyl cellulose in the coatings has been optimized, and the effects of the surface average roughness (Ra) and the coating thickness on the durability of the SCRSs have been studied. The SCRSs possess the best durability when the coating thickness is around 2/3 of the Ra of the substrate surface. The Ra of the substrate surface is fixed at 15.3μm, the durability of the SCRSs increases with the coating thickness at first. As the coating thickness exceeds 2/3 of the substrate Ra, the durability of the SCRSs decreases gradually if the coating thickness increases further. The conclusion is also verified by the SCRSs with aluminum alloys substrates under different Ra. Our work provides a feasible approach for the fabrication of robust superhydrophobic surfaces with excellent durability.

Determination of the cellulose- and lipid-containing components influence on the extrudate technological indicators

The effect of cellulose- and lipid-containing components on the technological parameters of the extruded mixture based on protein- and starch-containing raw materials on the technological parameters of the extrudate was studied. The use of components that modify such technological indicators of the extruded mixture as water resistance and swelling is substantiated. It is proposed to use sunflower husks and sunflower phosphatide concentrate as modifying additives to the mixture for extrusion. A rational ratio of the specified components in the extrudate was established to obtain indicators of water resistance in the range of 220...300 min and swelling in the range of 100...120 %. This is an important aspect of expanding the range of extruded products from the waste of oil and fat industries and obtaining high-quality competitive products. The object of the study is the dependence of water resistance and swelling of the extruded mixture on the content of modifying additives. Their rational ratio in the extrudate is: sunflower husk – 6.0 %; sunflower phosphatide concentrate – 5.0 %. The manufactured extrudate sample corresponds to commercial fish feed in terms of chemical composition and technological parameters, and also has a 4 times lower cost. A feature of the obtained results is the possibility of regulating the water resistance, swelling and porosity of the extrudate based on protein- and starch-containing raw materials, depending on the ratio of cellulose- and lipid-containing modifying additives. This allows to change the technological parameters of the finished product depending on the chemical composition of the mixture of raw components according to the requirements of the consumer. The results of the conducted research prove that cellulose- and lipid-containing secondary products of production can be successfully transformed into new competitive products

Karakteristik Arang Kulit Buah Kakao dan Arang Batang Bambu Terhadap Mutu Briket

The purpose of this research is to determine the optimum properties of biodegradable plastic made from banana weevil starch with the addition of straw cellulose as reinforcement. This research was conducted using Completely Randomized Method (CRD) with four treatments and four replications. In this study were the addition of straw cellulose with a ratio of starch and cellulose 1:0; 1:0,5 ; 1:1 and 1:1,5. Tests were carried out on strong tensile strength, elongation at break, biodegradation, swelling and water vapor transmission rate. The data obtained were analyzed statistically using analysis of variance (ANOVA). The addition of straw cellulose had a significant effect on the manufacture of biodegradable plastics. The result were biodegradable plastic increase tensile strength, decreases elongation at break, increase biodegradation and air resistance, reduces the rate of water vapor transmission. Biodegradable plastic with the best treatment is the ratio of starch starch ratio of 1 : 1.5 cellulose. The best result biodegrabable plastic has for tensile strength value of 9.56 MPa, elongation 6.8%, complete biodegradation on day 6, swelling 41.51% and WVTR 0.0156%.

GREEN ADSORBENT SYNTHESIS FROMORANGE MESOCARP CELLULOSE USING GRAFT COPOLYMERIZATION

The potential of agricultural waste like orange (Citrus sinensis) mesocarp is yet to be explored. Thus, in this study the extractionof green adsorbent that will be renewable, low cost and environmentally friendly from orange mesocarp was examined. The extraction was done using alkali pretreatment method followed by bleaching process to obtain cellulose and dissolvethe hemicellulose, lignin and other extractives. Then, graft copolymerisation of acrylamide onto the cellulose obtainedwas done usingfree radical initiation system. Grafting parameterswere studied by varying the effects of initiator concentrations,monomer to cellulose ratio, temperature and time. Distilled water was used toextract the formedpolyacrylamide (PAam)for 48 hours. And the characterization of the extracted and grafted cellulose samples was carried out by Fourier Transform Infrared Spectroscopy(FTIR).Orange mesocarp gave a cellulose average yield of 29.1%. The optimum grafting conditions were found to be 30OC at a time interval of 2 hours, ratio of monomer to cellulose being 3:1 and initiator concentration of 0.020M. The percentages of polymerization, graft and graft efficiency were 113.40, 86.83 and 45.90respectively. Also, the absorbance peaks of thesamplesconfirmed that grafting was effectively carried out on the cellulose backbone.

Biological denitrification performance of a novel sulfur-slow-release carbon source mixed filler

Long-term operation of the sulfur autotrophic denitrification (SAD) process leads to pH reduction, nitrite accumulation, a low nitrogen removal efficiency and excessive sulfate in the effluent. Two slow-release carbon source (SRC) fillers (reactors S2 and S3) consisting of different ratios of hydroxypropyl methyl cellulose, disodium fumarate, polyhydroxy fatty acid ester and Fe3O4 powder were designed to couple SAD with heterotrophic denitrification by using SRC and sulfur particles (reactor S1) as components, combining the advantages of both processes while avoiding secondary pollution. During reactor operation, S3 showed the best denitrification performance. Under the optimal hydraulic retention time of 4 h, different influent nitrate concentrations of 39.92 ± 0.59 mg/L and 20.22 ± 0.45 mg/L achieved average nitrate removal efficiencies up to 88.01 ± 3.62 % and 94.28 ± 2.52 %, and the average denitrification strength were 8.78 mg N/(L·h) and 4.77 mg N/(L·h), respectively. 16S rRNA gene analysis at the genus level showed that the coupled reaction had the highest relative abundance of Thiobacillus associated with SAD, and SAD dominated the coupled system.