Adsorption Of Methyl Red Research Articles

Methyl Red Adsorption on Biochar Obtained by Physical Activation of Caraway Seeds with Carbon Dioxide.

In this study carbon adsorbents were produced from caraway (Carum carvi L.) seeds, through direct and physical activation by carbon dioxide. The resulting biochar adsorbents were analyzed using low-temperature nitrogen adsorption-desorption isotherms and Boehm titration. Furthermore, the acid-base properties of the biochar samples obtained were examined, and the pH of their aqueous extracts was determined. The obtained adsorbents had a specific surface area ranging between 10 to 70 m2 /g. Resulting carbon materials exhibited a predominance of basic groups on their surfaces. The sorption capacities of methyl red for the samples varied from 3 to 20 mg/g. Conducted adsorption studies determined, that the adsorption kinetics of the dye on biochar materials followed a pseudo-second order model and the adsorption process was best described by the Freundlich isotherm, indicating the development of a multi-layer adsorbate on their surfaces. The effectiveness of adsorption in aqueous solutions of methyl red increased with the rise in process temperature. Moreover, the adsorption process was found to be spontaneous and endothermic based on thermodynamic investigations.

Adsorption of Methyl Red on porous activated carbon from agriculture waste: Characterization and response surface methodology optimization

Activated carbon is an internationally recognized adsorbent substance that removes contaminants from industrial discharges. In this study, we evaluate the capacity of Activated carbon produced by the chemical carbonization of Rosemary root, considered agricultural waste, by using phosphoric acid as an activator to adsorb Methyl Red (MR) from aqueous solutions. To identify the optimum conditions for the carbonization process, the effects of several factors on the removal of methyl red were examined. These parameters included carbonization time, temperature, phosphoric acid concentration, and contact time, with the help of experimental design. We found that 550 °C is the optimal temperature for carbonization of rosemary root, and the concentration of H3PO4 was discovered to be 5.5 mol/l. What about the times we determined for contact time and carbonization time, which were 30 min and 120 min, respectively. The resulting Activated Carbon of Rosemary Root (ACRR) material was then characterized using XRD, FTIR, Boehm titration, SEM/EDX, RAMAN, and Zeta potential. A batch system is used to perform our adsorption. In addition to pH effects, initial MR concentration, contact time, and masse effect were examined, and all the results were confirmed via experimental design using full factorial. In the present study, 15 mg of the adsorbent exhibited an adsorption capacity of 154.53 mg/g at pH 3.25 and a temperature of 328.15 k at a concentration of dye 50 mg/l. The adsorption results of methyl red onto ACRR powder showed that the adsorption process was best correlated with Freundlich isotherm and pseudo-second-order kinetic. According to the thermodynamic study, the system is exothermic. In order to understand the activated sites presented on MR and the mechanism of adsorption, density functional theory (DFT) using the B3LYP/6-311G base was used. Furthermore, the experimental results agree with the results of the computational model.

Adsorption of Methyl Red and Methylene Blue on Carbon Bioadsorbents Obtained from Biogas Plant Waste Materials.

In this study, biocarbon was obtained from the waste material corn digest. Carbon adsorbents were obtained by physical activation of the precursor with CO2. Detailed physicochemical characterization of the biocarbon was carried out using low-temperature nitrogen adsorption/desorption, Boehm titration, zero-charge point (pHpzc) and iodine number. In addition, the sorption capacity of the biocarbon agents towards an aqueous solution of methylene blue and methyl red was determined, and the kinetics of the adsorption process were determined. The biocarbon adsorbents were characterized by an average developed specific surface area covering the range from 320 to 616 m2/g. The sorption capacity of the biocarbon adsorbents against methylene blue ranged from 40 mg/g to 146 mg/g, and for methyl red it covered the range from 31 mg/g to 113 mg/g. It was shown that the efficiency of organic dye removal by the obtained biocarbons depends on the initial concentration of the adsorbate solution, its mass, shaking rate, adsorbent-adsorbate contact time and temperature. The results obtained from the Langmuir and Freundlich kinetic models showed that the Langmuir model is the most suitable model for describing the adsorption of the studied pollutants on biocarbon. In turn, the adsorption kinetics of dyes is described according to the pseudo-second-order model. Adsorption studies also showed that as the process temperature increases, the removal efficiency of methylene blue and methyl red increases.

Multi-factorial investigation of the effect of biochar of the secondary medicinal residue of snow lotus on the adsorption of two azo dyes,methyl red and methyl orange.

Azo dye residues pollute water, which are difficult to decompose, and posing a major threat to the ecological environment. The residues of Chinese medicine still have many possibilities for use after its medicinal value has been brought into play. In this study, secondary residue biochar activation (Na2 CO3 -modified, SBA) and secondary residue biochar (unmodified, SBC) were prepared from the secondary residue of snow lotus at 200-600°C. Surface features were obtained by Brunauer-Emmett-Teller N2 method and combined with scanning electron microscopy, and their structures were analyzed by x-ray diffraction spectroscopy, Fourier infrared and near-infrared spectroscopy. The effects of five factors, including initial concentration, contact time and adsorption temperature and so forth, on the adsorption of methyl red (MR) and methyl orange (MO) solutions were investigated. Results showed that the biochar yield, specific surface area, and pore size increased after modification. modification promoted the formation of the internal structure aromatization and oxygen-containing functional groups. Adsorption experiments showed that the surroundings pH = 8, the dyes adsorption concentration of 8 mg/L, adsorption temperature of 20-40°C and time of about 1 h were more stable. Under the condition, the removal of MO by SBA could reach approximately 60%-80% (480-640 mg/g), while the removal of MR could reach more than 90% (>720 mg/g).The charcoal prepared and modified under high temperature conditions was more effective for MO adsorption, while MR relied on low temperature effectively. This study provides a new choice of adsorbent for MR and MO and finds a new direction for the utilization of snow lotus residues.

Removal of methyl red from wastewater using a NiO@Hyphaene thebaicaseed-derived porous carbon adsorbent: kinetics and isotherm studies

In this study, the adsorption of methyl red (MR) dye from wastewater on nickel oxide (NiO) doped in porous carbon derived fromHyphaene thebaica(HT) seeds (NiO@HT derived C) as an adsorbent material was investigated.

Methyl Red Adsorption on Pristine and Al and Ga-Doped (6, 0) and (7, 0) Zigzag BNNTs: A DFT Study

Methyl Red Adsorption on Pristine and Al and Ga-Doped (6, 0) and (7, 0) Zigzag BNNTs: A DFT Study

The effect of head group of surfactant on the adsorption of methyl red onto modified coffee residues

The effect of the head group structure of surfactant on the adsorption of methyl red (MR) onto modified coffee residues (MCRs) has been investigated. The coffee residue (CR) was modified by a cationic surfactant, namely Dodecyltrimethyl ammonium bromide (DTAB) and a zwitterionic surfactant, namely N, N-Dimethyldodecylamine N-oxide (DDAO). The CR and MCRs (DTAB–CR and DDAO–CR) were characterized by using SEM, EDX, BET and FTIR analysis. The effect of pH, contact time and initial MR concentration on the adsorption process was studied. Langmuir and Freundlich isotherm models were used to evaluate the experimental data. Adsorption equilibrium data were fitted to Langmuir isotherm, and the maximum adsorption capacities with DTAB–CR and DDAO–CR was 66.66 and 76.72 mg/g, respectively. On the other hand, the results of kinetic studies showed that the data were in maximum agreement with the pseudo-second-order kinetic model. Based on the experimental data and the proposed adsorption mechanism, it was concluded that zwitterionic surfactant is the most efficient for the adsorption of MR.

Ultrasound‐assisted enhanced and rapid uptake of anionic dyes from the binary system onto MnFe2O4/polyaniline nanocomposite at neutral pH

Remediation of toxic dyes from an aqua matrix using novel nanocomposites as adsorbent is an attractive yet challenging task, especially when the adsorption process needs to be operated at near‐neutral solution pH. Recently, conducting polymer‐based novel nanocomposites have been studied widely for environmental remediation because of their high distinctive surface area, mesoporous nature, easy synthesis process, availability of the low‐cost monomer, and comprehensive range of functionality. This research deals with the fabrication and application of manganese ferrite and polyaniline nanocomposite (MnF‐PANI‐NC) for the ultrasound‐assisted adsorption of methyl red (MR) and congo red (CR) dye from binary dye solution at neutral pH. The X‐ray diffraction pattern of MnF‐PANI‐NC confirmed the successful impregnation of manganese ferrite onto polyaniline, and the field emission gun scanning electron microscopy and transmission electron microscopy images revealed the nanoscale formation of this composite. The saturation magnetization of ~20 emu/g endorses the easy magnetic separation of MnF‐PANI‐NC from dye solution. MnF‐PANI‐NC has revealed higher adsorptive affinity towards MR and CR dye concerning pure PANI and pure MnF nanoparticles at near‐neutral solution pH. Assimilation of ultrasound wavse in this adsorption procedure improved the mass transfer rate significantly, and within 6 min of reaction more than 95% of MR and CR dye removal was achieved. Ultrasound waves also enhanced the equilibrium dye uptake efficiency (more than 95%) of MnF‐PANI‐NC compared to the adsorption reaction by overhead stirring (40–50%) and shaking (40–60%) for both MR and CR dyes. Kinetic modeling of the experimental data revealed accurate fitting of the pseudo‐second‐order model in association with intraparticle diffusion. Binary dye adsorption onto MnF‐PANI‐NC obeyed the Langmuir isotherm model accurately, and maximum adsorption capacities of 294.12 and 317.46 mg/g were observed for MR and CR dyes, respectively.

Study on the Adsorption of Methyl Red by Bentonite / Chitosan Composites

A composite material is formed by using chitosan and bentonite under the condition of dissolution with acetic acid. The material was characterized by scanning electron microscope thermogravimetric analysis and infrared spectroscopy. The effects of initial concentration of methyl red, adsorption time, pH, and amount of adsorbent on adsorption were investigated. Then, the adsorption process was analyzed from kinetics, and related parameters were calculated. The results showed that the composite material has a wider pH range than using chitosan as an adsorbent to adsorb methyl red; The mass ratio of chitosan to bentonite is 0.08:1, the removal rate of methyl red is the best; The amount of adsorbent used is 0.7mg to reach saturation for a volume of 25mL of methyl red solution with a concentration of 20ug/l; the adsorption of methyl red by the material conforms to the pseudo-second-order kinetic model.

Adsorption of methyl red on biogenic Ag@Fe nanocomposite adsorbent: Isotherms, kinetics and mechanisms

UV–visible spectroscopy, transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy were used for the characterization of core-shell Ag@Fe bimetallic nanocomposites. Thermal and photochemical methods were used for the degradation of methyl red in the presence of Ag@Fe. Batch experiments showed that the initial [dye], dose of Ag@Fe, [NaBH4], and temperature were affected by degradation and adsorption. The kinetics study showed that the removal had an induction period followed by an autoacceleration, which depended on the dose. The apparent pseudo-first order rate constants for the degradation of methyl red (MR) increased and decreased with increasing [Ag@Fe] and [NaBH4], respectively, but remained constant at higher [NaBH4]. The equilibrium adsorption data were fitted to Langmuir, Freundlich and Temkin isotherms. The maximum adsorption capacity from the Langmuir isotherm was determined to be 125 mg/g for the physisorption of MR onto the surface of Ag@Fe. The pseudo-first rate constant was calculated (7.5 × 10−3 s−1) for the UV-light assisted degradation of MR.

Fluorescence Quenching Investigation of Methyl Red Adsorption on Aluminum-Based Metal-Organic Frameworks.

The adsorption of methyl red (MR) isomers (ortho, meta, and para) on metal-organic frameworks (MOFs) was investigated by using a fluorescence quenching technique. All three MR isomers were found to quench the fluorescence of MOFs effectively. Nonlinear fluorescence quenching trends were observed in Stern-Volmer plots. A modified nonlinear Stern-Volmer equation with the concepts of multiple adsorption sites, adsorption strength, and quencher accessibility was successfully adopted to fit the fluorescence quenching data. The fitted parameters were correlated with the structural properties of MRs and MOFs. The order of quenching efficiency was found to be m-MR > p-MR > o-MR for all MOFs. This indicates that MR molecules not only adsorb via carboxylate-metal bonding but also adsorb through π-π interactions between the aromatic rings of MR and linker molecules in MOFs. The position of the carboxylate group in MRs and the structure of the linkers in MOFs are the key factors affecting the fluorescence quenching efficiency.

Adsorption of methyl red on activated carbon derived from custard apple (Annona squamosa) fruit shell: Equilibrium isotherm and kinetic studies

Activated carbon prepared from custard apple (Annona squamosa) shell by K2CO3 (ACCO3) and H3PO4 (ACPO4) activation were used to study the removal of methyl red (MR) from aqueous medium. The BET surface area, pore volume and pore size of the ACCO3 was 431.3m2/g, 0.054cm3/g and 21.63Ǻ and that of ACPO4 was 1065.0, 0.269cm3/g and 31.91Ǻ, suggesting mesoporous nature of the activated carbons. The FT-IR spectra established the occurrence of –COOH and –OH functional groups. SEM images suggested porous and heterogeneous surface. The contact time, adsorbent dose, initial concentration of MR, initial solution pH and temperature were optimized by batch method. The isotherm modeling of the adsorption data over the concentration range (80–130mg/L) at 303, 313 and 323K was performed using non-linear regression analysis. The data best described by Langmuir isotherm over the entire concentration range. The negative ΔG° and positive ΔH° values indicated spontaneous and endothermic adsorption process. The kinetic modeling revealed that the experimental data followed the pseudo-first order and pseudo-second order rate equations for ACPO4 and ACCO3, respectively.

Adsorption of Methyl Red by Water‐Hyacinth (Eichornia crassipes) Biomass

The surface characteristics and adsorbent properties of biomass, obtained from low-cost and environmentally problematic water hyacinth, were determined. Optimum conditions for the elimination of the industrial dye Methyl Red (1) from aqueous solution were established by means of a batch adsorption technique. The ultimate adsorption capacity of water-hyacinth biomass in terms of the elimination of 1 was calculated from a Langmuir-type isotherm as 8.85x10(-2) mol g(-1) at 30 degrees and at an optimum solution pH of 8.0. Dye elimination was found to be associated with strong electrostatic forces (physisorption), the overall process being slightly endergonic (deltaG>0). Our study shows that water hyacinth has a great potential of removing color from wastewater and other dye-polluted aquatic systems.

Adsorption of methyl red on sterchamol

The mode of retention of methyl red on Sterchamol is studied by the adsorption of compounds containing some of the functional groups active for hydrogen bonding in the methyl red molecule. It is shown that two types of adsorbing centres exist on the Sterchamol surface. An adsorbate with an oxygen or nitrogen electron-donor atom in its molecule deactivates only one type of centre. Both electron donors are present in a methyl red molecule, allowing both types of active sites to be deactivated by this adsorbate.

Quantitative Determination of Methyl Red Adsorption on Stationary Phases Used in Liquid Chromatography

Abstract The method described is a modification of the dye adsorption method, first published by Shapiro and Kolthoff. It is reproducible and allows the estimation of the relative amount of the reachable free silanol groups on silica gels and reversed phase materials which are frequently used as stationary phases in liquid chromatography. Results obtained with commercially available thin layer and high performance liquid chromatographic materials, as well as with self-made reversed phase materials, are reported.

Reversed- and normal-phase high-performance liquid chromatography of 18-hydroxylated steroids and their derivatives : Comparison of selectivity, efficiency and recovery from biological samples

The chromatographic behaviour of adrenal 18-hydroxysteroids, and a series of derivatives thereof, has been studied in reversed-phase and normal-phase high-performance liquid chromatography (HPLC). Both 18-hydroxycorticosterone and 18-hydroxy-11-deoxycorticosterone exhibited a marked loss of chromatographic efficiency when separated on incompletely-covered C 18 reversed-phase packings with methanol-water gradient elution. Maximum-coverage reversed-phase supports (as determined by methyl red adsorption) showed no such effect, nor was it seen when aprotic solvents, such as dioxane, were used. This phenomenon is unique among the wide range of adrenal and testicular steroids that we have studied and affords a useful test, applicable under aqueous conditions, of coverage by the alkylsilane reversed phase, a factor of considerable importance in the successful resolution of complex mixtures of adrenal steroids by reversed-phase HPLC. The retention times of the 20-methoxy, 20-ethoxy, 21-acetoxy, etiolactone, 11β, 18-ether and dimeric derivatives of the naturally-occurring 18-hydroxysteroids have been determined in relation to major adrenal steroids. Procedures for extraction and reversed-phase HPLC of 18-hydroxysteroids from tissues without the formation of these less polar forms, which can complicate their separation by other chromatographic techniques, are illustrated with respect to a human malignant adrenocortical tumour which caused hypermineralocorticism.

Surface Areas from Adsorption of Methyl Red by Column Chromatography

Surface Areas from Adsorption of Methyl Red by Column Chromatography