Removal Rate Of Methylene Blue Research Articles

Poly(sodium 4-styrenesulfonate) brushes-functionalized UiO-66-NH2 metal-organic framework for high and selective adsorption of dyes

Advanced adsorbents with high adsorption capacity and adsorption selectivity are desirable. Here, a Zr-based metal-organic framework (MOF), UiO-66-NH2 @poly(sodium 4-styrenesulfonate, Nass), was synthesized using the high surface area of MOFs as a substrate and the high grafting density of surface initiated-atom transfer radical polymerization (SI-ATRP). UiO-66-NH2 @poly(Nass) was used to adsorb different dyes. The maximum adsorption capacity (Qm) of methylene blue (MB) and basic fuchsine (BF) was 299.8 and 789.2 mg·g−1, respectively, which were higher than those of Sudan I (SD I, 6.340 mg·g−1), neutral red (NR, 188.1 mg·g−1), methyl orange (MO, 199.5 mg·g−1), and acid chrome blue K (AK, 122.3 mg·g−1). The adsorption isotherms and kinetics were investigated, and it was confirmed that the Langmuir isotherm and the pseudosecond-order kinetic model fit our adsorbents. In the binary mixed solution, the removal rate (R) of MB reached 64.44%, while that of MO was only 3.340% for MB/MO. R was 64.29% for MB and 21.97% for AK for MB/AK and 97.45% for BF and 30.03% for MO for BF/MO, verifying the preferential selectivity to adsorb basic dyes. The superior adsorption was ascribed to multiple interactions, including electrostatic interaction, hydrogen bonding, and π–π accumulation. In addition, the effect of grafting poly(Nass) on the pore size of UiO-66-NH2 was studied. The excellent stability showed that the R dropped by less than 15.62% after five consecutive cycles. The UiO-66-NH2 @poly(Nass) was applied in the determination of MB and BF in water, crucian carp, and green shrimp. Good linearity was observed for MB (R2 = 0.9971) and BF (R2 = 0.9993) in the range of 0.2–30 and 0.5–50 μg·mL-1, respectively, with satisfactory recoveries (in the range of 87.45–101.3% for MB and 90.34–98.86% for BF), achieving favorable practicability.

In situ synthesis of novel high-efficiency visible-light-driven p-n heterojunction BiOBr/Ag2CrO4 photocatalysts

In this work, novel visible-light-driven BiOBr/Ag2CrO4 p-n heterojunction photocatalysts were prepared by a simple in situ deposition method and characterized, the photocatalytic activity of the prepared BiOBr/Ag2CrO4 heterojunction was significantly higher than those of the pure BiOBr and Ag2CrO4 samples. Under 20 min visible-light irradiation, the degradation rate of methylene blue (MB) by BiOBr/Ag2CrO4 was as high as 98.3%, the kinetic reaction rate constant of degradation was 20.68 times higher than that of BiOBr and the removal rate of MB was still maintained at 90.8% after five cycles. This work provides a new option for the simple preparation of high-efficiency p-n heterojunctions.

Nitrogen-doped hydrochars from shrimp waste as visible-light photocatalysts: Roles of nitrogen species

The increasing shrimp waste production has caused severe environmental problems. In this study, nitrogen-doped hydrochars (NDHCs) were facilely synthesized from shrimp waste and glucose by one-pot hydrothermal carbonization (HTC). The characterizations showed that NDHCs had large surface areas of up to 30.5 m2 g−1 with numerous functional groups on their porous surfaces. The nitrogen content (1.3–2.8%) and species distribution in NDHCs were associated with the amount of added glucose. These NDHCs were applied as visible-light-induced photocatalysts, and their photocatalytic performances were evaluated by methylene blue (MB) degradation. The removal rate of MB reached 88.9% after 1 h of visible light radiation by NDHC-1, which was 2.3 times higher than that of glucose-derived hydrochar (GHC). The mechanism study showed that the improved photoactivity of NDHCs was attributed to the increased adsorption capacity by porous surface and the promoted formation of hydroxyl radicals by synergistic effects of quaternary N and pyrrolic N during photocatalysis. This study offered a green approach to preparing tunable, efficient, and low-cost photocatalyst from waste biomass and insight into the photocatalytic mechanism of hydrochar materials.

Activation of peroxymonosulfate by magnetic CuFe2O4@ZIF-67 composite catalyst for the study on the degradation of methylene blue

In this research, a novel magnetically recoverable composite catalyst, CuFe2O4 @ZIF-67, was synthesized. CuFe2O4 @ZIF-67 composite catalyst was applied to degrade methylene blue (MB) in water by activating peroxymonosulfate (PMS). The results showed that the degradation rate of MB (20 mg/L) reached 98.9% in 30 min in the 0.2-CuFe2O4 @ZIF-67 (75 mg/L) + PMS (125 mg/L) system. Both electron paramagnetic resonance (EPR) studies and radical quenching experiments revealed that SO4−•, •OH, 1O2 and •O2− were involved in the degradation of MB. We proposed a catalytic mechanism of PMS activation by CuFe2O4 @ZIF-67. With the synergistic effect of Co3+/Co2+, Fe3+/Fe2+ and Cu2+/Cu+ redox cycles, it can keep its outstanding catalytic activity. Recycling tests showed that the removal rate of MB can still be maintained above 85%, indicating that CuFe2O4 @ZIF-67 has good reusability. In general, owing to its reusability and excellent catalytic activity, the CuFe2O4 @ZIF-67 composite catalyst has a good application prospect in water pollution control.

Effect of carbonization temperature of carbon felt on removal of methylene blue: carbon felt as the cathode of Electro-Fenton system

The surface properties of carbon fiber have been regarded as the critical factor for 2-electron oxygen reduction (ORR) and degradation of organic pollution in Eletro-Fenton process. The aim of this work was to investigate the effect of carbonization temperature on the performance of carbon felt as the cathode for degradation methylene blue (MB). This work was adopted carbon felt that obtained at the carbonization temperature of 1050, 1600, 2000 °C respectively, comparison of the electrogeneration of H2O2 and MB removal rate at pH 3. Compared with CF-B and CF-C, high-yield H2O2 production (38.9 mg L−1, 1.3 mg h−1 cm−2) and high-degradation rate of MB (96.7%, kinetics constant: 0.0623 min−1) in CF-A system have been achieved. The hydrophilic was carried by water contact angle test, indicated that the inert of surface: CF-C > CF-B > CF-A. The disorder degree of surface was characterized by Raman spectroscopy, and in combination with CV and LSV tests, revealed the ORR catalysis properties of different types cathode. This study suggested that lower temperature of carbonization was in favour of carbon felt as the Electro-Fenton cathode to degenerate organic pollution.

Two-dimensional ultrathin MoS2 modified hydrogenated TiO2 nanoparticles for superior photocatalytic degradation under simulated sunlight

Photocatalysis is an effective technology for degradation of organic contaminants. Herein, we firstly synthesized hydrogenated TiO2 (HT) nanoparticles by calcining P25, and on the basis of HT, two-dimensional ultrathin MoS2/HT binary composites with different component ratios (MHT-20%, MHT-30% and MHT-35%) were controlled prepared. UV–vis diffuse reflectance spectra (DRS) showed that the HT nanoparticles exhibited stronger absorption towards visible light in the range of 550–800 nm compared to P25, and the introduction of two-dimensional ultrathin MoS2 nanosheets further enhanced the visible light absorption ability of MHT composites. Under simulated sunlight irradiation, the removal test of methylene blue (MB) in the present of various photocatalysts indicated that the catalytic performance of HT sample was better than that of P25, and MHT binary composites displayed more excellent photocatalytic performance. A maximum removal efficiency of MB reached 95% within 4 h over MHT-30% photocatalyst. Moreover, the kinetic constant of MHT-30% catalyst is 5.6, 3.6 and 2.5 times as much as that of P25, MoS2 and HT, respectively. In addition, the repeated degradation study and composition analysis of MHT-30% before and after photocatalytic reaction showed that MHT-30% photocatalyst exhibited good stability, and the removal rate of MB still reached 88% in four cycles. The improved and stable photocatalytic performance of MHT-30% can be attributed to band matching and tight interface bonding between MoS2 and HT, which accelerated the electron transfer and broaden the visible-light response range.

Multi-step preparation of Fe and Si modified biochar derived from waterworks sludge towards methylene blue adsorption

A magnetic nitrogen-doped sludge-based biochar (NAlSB–Fe–Si) was prepared based on waterworks sludge for raw material and dicyandiamide for nitrogen source to adsorb methylene blue (MB) from water. And the magnetic particles loaded on the adsorbent were obtained through functionalizing iron and silicon ions which were extracted from the biochar by acid and alkali impregnation. Physicochemical properties of sludge-based biochar (SB) were analyzed by SEM, BET, FTIR, XRD, XPS and VSM. Compared with the original biochar, NAlSB–Fe–Si had richer pore structure and higher pore volume, and the SiO2 and Fe3O4 loading made the specific surface area increased by 200%. Possible adsorption mechanism was proposed by exploring the initial pH, MB concentration and reaction time. Results revealed that alkaline environment was more conducive to the rapid removal of cationic dyes such as MB. Pseudo-second-order kinetic model and intra-particle diffusion model could describe the adsorption behavior of MB on NAlSB–Fe–Si. The fitting results of Langmuir model showed that adsorption temperature is positively correlated with adsorption capacity, and the maximum adsorption capacity of MB on nitrogen-doped sludge-based biochar (NSB) and NAlSB–Fe–Si at 25 °C was 26.47 and 300.36 mg/g, respectively. Finally, the MB removal rate of NAlSB–Fe–Si could still reach 70% after four cycles, indicating that the composite was an efficient cationic dye adsorbent, and its preparation could be regarded as a way of resource utilization of waterworks sludge.

An iron–based biochar for persulfate activation with highly efficient and durable removal of refractory dyes

The magnetic biochar catalyst (Fe@BC) was synthesized by pyrolyzing Fe–tanned collagen fiber based on the tanning process and used as a high–efficiency and recyclable persulfate (PS) activator to degrade refractory dyes. In this study, methylene blue (MB) was chosen as a model pollutant to evaluate the performance of the Fe@BC/PS system. Results illustrated that MB was completely removed within 20 min with a rate constant (kobs) of 0.2246 min–1, which was much higher than that of pure biochar (0.0497 min–1), and high mineralization efficiency (92%) for MB degradation was obtained. Notably, the MB removal rate still reached 72% after 20 cycles. The high catalytic activity and excellent recycling performance could be attributed to the uniformly dispersed iron species, abundant oxygen functional groups, and defective carbon matrix. Radical quenching experiments and electron paramagnetic resonance studies illustrated that SO4•– was the predominant free radical for MB degradation. Moreover, other refractory dyes could also be rapidly and efficiently removed from the Fe@BC/PS system. This work is expected to propose a promising catalyst for the degradation of refractory dyes and open a new possibility for the durable removal of refractory organic dyes.

Activated Carbons derived by Phosphoric acid Activation of Agricultural waste and their Adsorption of Methylene Blue

Agricultural wastes can be considered as suitable raw materials for activated carbon production, as activated carbon is considered as an economical adsorption material. Seeds from biomass of Ziziphus mauritiana Lam, grown in Algerian have been valorized for activated carbon production by the phosphoric acid, activation method with pyrolysis temperatures of 400, 500 and 600 °C. The effect of changes in pyrolysis temperatures on the yield and quality of the prepared activated carbon was studied. The obtained activated carbons were characterized by FT-IR and MB adsorption, a good yield of 38,625 %, a high BET surface area of 915,58 m2/g. The removal rate of methylene blue was strongly influenced by contact time, adsorbent mass and pH. An excellent removal % of methylene blue (MB) was obtained at the preferred temperature of 500 °C (AC 500).

Micromorphology control of the lignin-based activated carbon and the study on the pyrolysis and adsorption kinetics

The waste corncob-based lignin (AL) treated by alkali was applied as feedstock to prepared activated carbon (AC) for the methylene blue (MB) adsorption. To explore the pyrolysis mechanism of ALs, the pyrolysis kinetics were discussed by the methods of Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) equations at different heating rates, which are widely applied in the determination of dynamic parameters with reduction of the errors of multi-step dynamics. In the process of preparing lignin-based activated carbon (LC), the relationship between pyrolysis condition and structure of LCs was systematically investigated. The maximum specific surface area of LCs reached 1215.83 m2/g with high the mesoporous proportion (77.3%) at optimal activation conditions including activation temperature (550 °C), activation duration (120 min) and phosphoric acid concentration (50%). For the adsorption of methylene blue (MB) solution, the fitted kinetic model was in accordance with the pseudo-second-order kinetic model. The adsorption capacity of MB could achieve as high as 493.28 mg/g (± 5 mg/g), and the highest removal rate of MB could reach 99.0% (± 0.2%) during the secondary adsorption process. This work offers a prospective proposal to provide theoretical reference for producing LC based on pyrolysis of alkaline lignin, and utilize the LC as potential adsorbent in the dyeing wastewater treatment.

Effective enhancement of electron migration and photocatalytic performance of nitrogen-rich carbon nitride by constructing fungal carbon dot/molybdenum disulfide cocatalytic system

To find a cocatalyst that can replace noble metals, fungal carbon dot (CD) modified molybdenum disulfide (MoS2) cocatalyst system was designed. The composites were prepared by hydrothermal and calcination methods with different ratios of CDs, MoS2 and nitrogen-rich carbon nitride (p-C3N5). p-C3N5 has excellent electronic properties, and MoS2 modified by CDs (D-MoS2) can significantly enhance the photocatalytic performance of p-C3N5 by improving the photogenerated electron migration efficiency. The experiments showed that the developed CDs/MoS2/C3N5 composites exhibited excellent performance in both photocatalytic hydrogen (H2) evolution and methylene blue (MB) degradation, with CMSCN5 (D-MoS2 with 5% mass fraction) showing the best photocatalytic activity. The corresponding H2 evolution rate of CMSCN5 was 444 μmol g-1h−1 and 1.45 times higher than that of unmodified p-C3N5, by 120 min, the removal rate of MB was up to 93.51%. The 5 cycle tests showed that CMSCN5 had great stability. The high charge mobility and high density of H2 evolution active sites of MoS2 nanosheets, together with the electron storage and transfer properties of CDs can obviously improve electron migration and reduce the photogenerated carrier recombination on the p-C3N5 surface. The design and preparation of such composites offer broad prospects for the development of photocatalytic systems with noble metal-free cocatalysts.

Peroxymonosulfate activation by algal carbocatalyst for organic dye oxidation: Insights into experimental and theoretical

Preparation of nitrogen-doped algal carbocatalyst (NC) for peroxymonosulfate (PMS) activation to oxidative degrade methylene blue (MB), and the mechanism of radical and nonradical pathway in N-C/PMS system are investigated. Firstly, a series of N-doped carbonaceous materials (NC) were prepared using nitrogen-rich Taihu blue algae biomass as precursor at different annealing temperatures. It was found that the NC prepared by annealing at 800 °C (N-C-8) showed an optimal MB degradation performance of over 99% after 60 min. Confirmed by electron paramagnetic resonance (EPR) analyses and radical quenching experiments, radical and nonradical pathway (1O2 oxidation and electron-transfer) are both involved in MB degraded process. Moreover, both graphitic N derived from the intrinsic Taihu blue algae, and nitrogen vacancy evolved from nitrogen dopants decomposition exhibited high correlation with the MB removal rate in the N-C/PMS system. Finally, three possible degradation pathways of MB were proposed based on the Density Functional Theory (DFT) calculation and identified intermediates. Overall, this work provides a new insight into the intrinsic roles of nitrogen-dopants and nitrogen vacancies on the as-prepared carbocatalyst for PMS activation, and advances the understanding of the resource utilization of algal biomass.

Synthesis of ZnO nanometer powders doped with Ce4+ ions and the photocatalytic degradation of dying wastewater

Ce4+-doped nanometer ZnO powder was synthesized by so-l gel method. The microstructures and properties of the samples were characterized through XRD, UV-Vis and FTIR. The results indicated that the Ce4+ was successfully incorporated into ZnO, and the diameter of the nanometer was about 10.7nm. It induced the redshifting in the UV-Vis spectra. The photocatalytic activity of the samples was investigated using methylene blue (MB) as the model reaction under irradiation with ultraviolet light. The results showed that the doping of Ce4+ could increase the photocatalytic activities of ZnO nanopowders and that the best molar ratio of Ce4+ was n(Ce)/n(Zn) = 0.05, that the surfactant was sodium dodecyl sulfate, and that the nanometer ZnO was calcinated at 550 ℃ for 3 hours. Meanwhile, it inspected the effect of photocatalytic efficiency through the pH of MB, the amount of catalyst, and illumination time. The experimental results revealed that the initial mass concentration of MB was 10 mg/L, that the pH value was 7-8, that the dosage of Ce4+/ZnO photo-catalyst was 5 g/L, that the UV-irradiation time was 2 h, and that the removal rate of MB reached above 85%. Under the optimized conditions, the degradation rate of real dye wastewater was up to 87.67% and the removal efficiency of COD was 63.5%.

Composite hydrogel membrane with high mechanical strength for treatment of dye pollutant

• The PVA-TiO 2 composite membrane with high tensile strength was developed. • The tensile strength of membrane can reach 14.3 MPa. • The maximum adsorption capacity of membrane to methylene blue is about 318.47 mg/g. • After 4 d of nature light treatment, the removal rate of methylene blue is 99.85%. • The membrane has the potential for the treatment of dye pollutant in industry. By adding dimethyl sulfoxide (DMSO), nano titanium dioxide (TiO 2 ) and sodium carbonate (Na 2 CO 3 ) to polyvinyl alcohol (PVA), the PVA-TiO 2 composite hydrogel membrane with high mechanical properties and photocatalytic ability was prepared using the freeze–thaw cycle method. The addition of DMSO and TiO 2 can effectively improve the mechanical strength of the composite hydrogel membrane and its photocatalytic degradation efficiency of dye. By optimizing the raw material ratio and preparation process, the tensile strength of the prepared composite membrane can reach 14.3 MPa, which is the highest among the reported membrane of its kind. The maximum tensile toughness is 8.16 MJ/m 3 , indicating the good ductility. The maximum adsorption capacity of methylene blue (MB) calculated from Langmuir isotherm model is 318.47 mg/g and after 4 d nature light treatment, the dye removal rate can reach 99.85%.

Effective heterointerface combination of 1D/2D Co-NiS/S-g-C3N4 heterojunction for boosting spatial charge separation with enhanced photocatalytic degradation of organic pollutants and disinfection of pathogens

The restricted visible light captivation and unwanted prompt recombination of photoinduced carriers remarkably hinder the activity of photocatalysts for the removal of organic pollutants. In this study, a new type heterojunction 1D/2D photocatalyst based on cobalt doped NiS nanorods (NRs) S-g-C 3 N 4 nanosheets (NSs) was effectively fabricated by self-assembly technique, and its photocatalytic performance for methylene blue (MB) degradation and antibacterial activity under visible light were explored. The quick electron transport of S-g-C 3 N 4 NSs and the compatible energy band positions of S-g-C 3 N 4 and 4% Co-NiS NRs synergistic accelerate the separation and transmission of e - and h + pairs across the Co-NiS/S-g-C 3 N 4 heterointerface. The as-constructed heterostructures were assessed by cutting-edge analytical techniques such as SEM, XRD, EDX, FTIR, TEM, UV–vis, XPS, PL, transient photocurrent and BET. Additionally, this rational design enriches visible-light absorption and demonstrates a high BET surface area. Advantaging from the combing effect of 1D and 2D nanostructures, the 25% Co-NiS/S-g-C 3 N 4 heterostructures achieve a significant photocatalytic MB removal rate of 98%, substantially enriched than that of undoped NiS NRs (32%), 4% Co-NiS NRs (55%) and S-g-C 3 N 4 (29%). Simultaneously, the inherent photo-corrosion feature of S-g-C 3 N 4 was stifled by concurrent coupling with Co-NiS NRs and modifying with Co, which was proved over a stability assessment with 6 repeated experimental results. Antibacterial activity of 25% 1D/2D Co-NiS/S-g-C 3 N 4 nanocomposites (NCs) alongside four bacterial species was explored by irradiation of visible light. Our findings highlight the inordinate distinction of the successful heterointerface coupling of Co-NiS/S-g-C 3 N 4 1D/2D heterojunction as a potential photocatalyst system for boosted photocatalytic removal of MB and decontamination of pathogens. • Novel cobalt modified 1D NiS NRs 2D S-g-C 3 N 4 NSs coupled heterojunction photocatalyst was constructed. • The superior visible light-harvesting ability of designed 1D/2D heterojunction. • The photocatalytic organic pollutants degradation activity of Co-NiS/S-g-C 3 N 4 is enlarged 3.34 times. • Rapid charge transportation found over 25% Co-NiS/S-g-C 3 N 4 heterojunction.

Study on the Adsorption Performance of Casein/Graphene Oxide Aerogel for Methylene Blue.

Casein (CS) and graphene oxide (GO) were employed for the fabrication of a casein/graphene oxide (CS/GO) aerogel by vacuum freeze drying. Fourier transform infrared spectroscopy, scanning electron microscopy, surface area and micropore analysis (BET), and thermogravimetric analysis were used to characterize the specific surface area, structure, thermal stability, and morphology of the CS/GO aerogel. The influence of experimental parameters such as the GO mass fraction in the aerogel, metering of the adsorbent, pH, contact time, and temperature on the adsorption capacity of the CS/GO aerogel on methylene blue (MB) was also investigated. According to Langmuir isotherm determination, the maximum removal rate of MB from the CS/GO aerogel was 437.29 mg/g when the temperature was 293 K and pH was 8. Through kinetic and thermodynamic studies, it is found that adsorption follows a pseudo-second-order reaction model and is also an exothermic and spontaneous process.

Efficient removal of cationic and anionic dyes by surfactant modified Fe3O4 nanoparticles

Magnetic nanoparticle adsorbents overcome the difficulty of solid-liquid separation in adsorption technology systems. However, their extremely large specific surface energy results in high levels of nanoparticle agglomeration and reduces their adsorption efficiency. To solve this problem, this study modified Fe3O4 particles with sodium dodecyl sulfate (SDS) and Cetyl Pyridine Chloride (CPC). Compared with pure Fe3O4 particles, the size distributions of SDS@Fe3O4 and CPC@Fe3O4 were more uniform, with a high level of magnetism and the capacity to achieve rapid separation (56.49 emu/g for SDS@Fe3O4 and 55.89 emu/g for CPC@Fe3O4). The results of dye adsorption tests showed that the adsorption effect was improved after modification, resulting in adsorption capacities of 62.43 mg/g for methylene blue (MB) by SDS@Fe3O4 and 176.98 mg/g for Congo red (CR) by CPC@Fe3O4. XRD results showed that the structure did not change, while FTIR results showed that no new functional groups were formed after adsorption. Adsorption followed pseudo-second-order reaction models, indicating that adsorption occurs via chemical adsorption processes. The adsorption process occurred mostly in accordance with the Langmuir model, which illustrates that monolayer adsorption was the dominant process. Thermodynamic data indicates that the adsorption process was endothermic and spontaneous. The adsorption mechanism for MB by SDS@Fe3O4 may be electrostatic adsorption and hydrophobic interaction, while for CR by CPC@Fe3O4 the mechanism may be electrostatic adsorption and hydrogen bonding. In addition, after five cycles of regeneration, the removal rate of MB was >77.0% and the removal rate of CR was >91.9%, confirming the excellent regeneration performance of Fe3O4. The simple and environmentally friendly manufacturing method, efficient adsorption process, rapid magnetic separation, indicate that surfactant modification of magnetic nanoparticles is an effective method for dye adsorption and removal.

Rare cis‐Dioxido Uranyl Framework Crystalline Complexes: Synthesis, Structure, Characterization and Properties

AbstractThe trans‐dioxido uranyl frameworks named as [(UO2)(Aip)(DMA)] (1), H[(UO2)(Aib)3] (2) and rare cis‐dioxido [(UO2)Co(Suc)2(H2O)4] (3), and [(UO2)Ni(Suc)2(H2O)4] (4) have been synthesized, which based on 5‐aminoisophthalic acid (H2Aip), 3‐aminobenzoic acid (HAib), and succinic acid (H2Suc) as ligands. They were characterized by Fourier Transform Infrared spectra, UV‐vis absorption spectra, single‐crystal X‐ray diffraction, powder X‐ray diffraction and thermogravimetry analysis. It was found that uranium ion of the complex 1 is in the pentagonal bipyramidal coordination environment, while those of the complexes 2–4 are in the hexagonal bipyramidal coordination environment. Complexes 1, 3, and 4 are 3D network structures, 2 is a discrete structure. In particular, geometry of O=U=O for 1 and 2 are trans, ones for 3 and 4 are cis. The highest removal rate of methylene blue was almost to 96 % by complex 1 as an adsorbent, which illustrates that potential application on dye adsorption.

A novel cellulose‐derived carbon aerogel@Na2Ti3O7 composite for efficient photocatalytic degradation of methylene blue

AbstractA scale‐up and sustainable method was developed to fabricate novel photocatalyst cellulose‐derived carbon aerogel@Na2Ti3O7 composite (CAT) by in situ growth of Na2Ti3O7 nanowhisker on the surfaces of fibers. With a three‐dimensional (3D) mesoporous network interconnected structure and a high specific surface area (248.92 m2/g), CAT exhibited excellent photocatalytic activity and methylene blue (MB) removal rate (98.3%). The photocatalytic experimental results showed that the CAT could degrade MB in the aqueous solution within 90 min. Compared with most reported catalysts, CAT exhibited a higher MB removal rate and shorter catalytic time. Therefore, the photocatalyst CAT based on environmentally friendly and low‐cost cellulose displayed great application potential in the degradation of MB.

Preparation of Nanosized TiO₂-Photocatalyst From-Sludge (TFS) and the Characteristics of Concrete Sidewalk Blocks Using TFS.

In this study, nano-sized low cost titanium dioxide (TFS) was prepared using sludge from sewage treatment and performance was verified. To remove air pollutants, the photocatalytic degradation of methylene blue and efflorescence characteristics is assessed according to the mixing ratio of the nano-sized TFS by applying them to concrete sidewalk blocks. The photocatalytic degradation performance of concrete sidewalk blocks shows that the methylene blue removal rate of specimens containing 2.5%, 5%, and 10% of nano-sized TFS is 29%, 27%, and 38%, respectively. When the nano-sized TFS is mingled on the surface of the sidewalk block, the performance of anti-corrosion and antifouling showed excellency mainly due to the moisture blocking derived by the antifouling function of photocatalysts.