Water
·
2022
·Vol. 14
·期 16
·2569
·
IF 3.53
Weifan Gao,Guichang Zhang,Xiaoping Zhang,Shaoqi Zhou,Zihao Wang
The catalytic capability of original carbon nitride (CN) is limited by a small specific surface area and high electron–hole recombination rate. In this study, WO3-loaded porous carbon nanosheets (MCA-CN/WO3) were synthesized by thermal treatment with melamine, cyanuric acid and WCl6. The MCA-CN/WO3could degrade 98% of the methylene blue (MB) within 30 min in the photo-Fenton-like process, displaying better catalytic activity than the original CN (30%), pure MCA-CN (63%) and original CN/WO3(87%). The results of photoluminescence and electrochemical impedance spectroscopy demonstrated that the Z-scheme heterojunction of MCA-CN/WO3inhibited the recombination of electrons and holes. In addition, the porous nanosheet structure accelerated the electron transfer and provided abundant active sites for MB degradation. A radical quenching experiment indicated that the Z-scheme heterojunction facilitated the decomposition of H2O2to produce1O2for MB degradation. The possible degradation pathways of MB were proposed.Keywords:photo-Fenton-like process;WO3-loaded porous carbon nitride nanosheet;Z-scheme heterojunction;MB degradation
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 10
·2871-2880
·
IF 3.709
Peiyi Li,Yuting Su,Zhanbo Hu,Yukai Zheng,Qian Zhou,Xiao Ouyang
In this study, three different types of biochar (biomass materials were beech wood, corncob, and bamboo) were loaded with bismuth to form bismuth impregnated biochars (named respectively as Bi@WBC, Bi@CBC, and Bi@BBC) to investigate their properties (pore structure and surface chemistry characteristics) on methylene blue (MB) removal capacities. Three bismuth impregnated biochars made from different biomass materials were ranked for their adsorption capacity of MB as follows: Bi@WBC > Bi@CBC > Bi@BBC, in which Bi@WBC showed the largest Langmuir adsorption capacity of 178.59 mg g −1 . While the specific surface area (SSA) and pore volume of Bi@WBC were the largest (accounting for 477.74 m 2 g −1 and 0.15 cm 3 g −1 , respectively), according to the FTIR and XPS results, Bi@WBC (72.3%) exhibited a higher proportion of Bi O bonds than the Bi@CBC (52.3%) and Bi@BBC (48.4%) did. Conclusively, the rich porous structure and surface functional groups of Bi@WBC affected the adsorption capacity of MB, and the chemical adsorption provided the main contribution. © 2022 Society of Chemical Industry (SCI).
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Polymers
·
2021
·Vol. 13
·期 18
·3054
·
IF 4.329
Yiming Zhou,Te Li,Juanli Shen,Yu Meng,Shuhua Tong,Qingfang Guan,Xinxing Xia
This article reports effective removal of methylene blue (MB) dyes from aqueous solutions using a novel magnetic polymer nanocomposite. The core-shell structured nanosorbents was fabricated via coating Fe3O4nanoparticles with a layer of hydrogel material, that synthesized by carboxymethyl cellulose cross-linked with poly(acrylic acid-co-acrylamide). Some physico-chemical properties of the nanosorbents were characterized by various testing methods. The nanosorbent could be easily separated from aqueous solutions by an external magnetic field and the mass fraction of outer hydrogel shell was 20.3 wt%. The adsorption performance was investigated as the effects of solution pH, adsorbent content, initial dye concentration, and contact time. The maximum adsorption capacity was obtained at neutral pH of 7 with a sorbent dose of 1.5 g L−1. The experimental data of MB adsorption were fit to Langmuir isotherm model and Pseudo-second-order kinetic model with maximum adsorption of 34.3 mg g−1. XPS technique was applied to study the mechanism of adsorption, electrostatic attraction and physically adsorption may control the adsorption behavior of the composite nanosorbents. In addition, a good reusability of 83.5% MB recovering with adsorption capacity decreasing by 16.5% over five cycles of sorption/desorption was observed.Keywords:nanosorbents;magnetic nanocomposite;dye adsorption;hydrogel;methylene blue
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 36
·16679-16688
·
IF 3.591
Lijuan Zhang,Dongqing Zhao,Yao Lu,Jinghan Chen,Haotian Li,Jinghan Xie,Yue Xu,Haikuan Yuan,Xijian Liu,Xueyan Zhu,Jie Lu
A highly efficient strategy was developed to fabricate a graphene oxide modified cellulose nanocrystal/PNIPAAm IPN (GO-CNC/PNIPAAm IPN) hydrogel, which was capable of effectively adsorbing cationic and anionic dyes. The adsorption of Congo red (CR) and methylene blue (MB) was investigated based on the effects of pH, adsorption isotherms, adsorption kinetics, and recycling experiments. The adsorption capacities for CR and MB of the GO-CNC/PNIPAAm IPN hydrogel adsorbent were 728.8 mg g−1 and 281.9 mg g−1, respectively, and the difference is due to complex electrostatic and chemisorption effects between the adsorbent and the dye, which could be explained using the Langmuir isotherm adsorption model and pseudo-second-order kinetics model. In addition, the GO-CNC/PNIPAAm IPN hydrogel could be used repeatedly, and the adsorption capacities for CR and MB were 84.9% and 82.4% of the original hydrogel after five re-adsorption experiments, respectively. This type of adsorbent provided the advantages of being low-cost, having simple preparation, being non-polluting, and having good adsorption effects and a long service life, which is promising for its use in dye wastewater treatment in the future.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Yanping Zhang,Peng Xiangshi,Jiayu Tian,Fen Li,Xuteng Fan,Liran Ma,Ruijun Zhang
Waste waterworks sludge and walnut shell were employed to synthesize a composite catalyst consisting of Fe 0 /Fe 3 O 4 /biochar using a one-step pyrolysis process . The synthesized catalyst was applied to active peroxymonosulfate (PMS) for studying the degradation of methylene blue (MB). Various characterization results confirmed that Fe 0 and Fe 3 O 4 were distributed on the surface of composite catalyst, which had a porous structure and large specific surface area of 109.87 m 2 /g. Owning to these structural properties, the composite catalyst presented desirable catalytic capability and reusability. When 0.4 g/L PMS and 0.3 g/L composite catalyst were added into the MB solution (pH 7), 99.9% MB could be degraded within 60 min at a high reaction rate of 0.1550 min −1 , which was much better than that of zero valent iron (ZVI)/PMS system. After the three cycles, the catalyst could still maintain an MB degradation of over 68.0%. The free radical quenching experiments and electron paramagnetic resonance experiments demonstrated that SO 4 − ∙ and HO ∙ were generated during the activation of PMS. The X-ray photoelectron spectrometer analysis revealed that Fe 3 O 4 and various functional groups, such as C O were formed on the composite catalyst, and the Fe 2+ was oxidized to Fe 3+ . Furthermore, the iron leaching experiments indicated that both the homogeneous and heterogeneous reactions occurred during the catalysis of PMS using the synthesized composite catalyst. Acidity and higher temperature were conducive to the catalytic reaction . This study offers a green and sustainable route for simultaneously degrading contaminants and reusing wastes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiafeng He,Gao Song,Xinyue Wang,Ling Zhou,Jumei Li
It is greatly significant to remove organic dyes and antibiotics in water because they are extremely harmful for human health and environment. In this work, we successfully developed magnetic Fe 3 O 4 /GO/Ag composite microspheres, using Fe 3 O 4 microspheres as cores to wrap graphene oxide (GO) interlayer and further in situ depositing silver nanoparticles onto GO layer. The microspheres were characterized by SEM, XRD , XPS and Raman spectroscopy . As compared to Fe 3 O 4 /Ag microspheres, Fe 3 O 4 /GO/Ag composite microspheres displayed higher activity for SERS detection, and also catalytic reaction due to the synergistic interaction of GO nanosheets and Ag nanoparticles. Subsequently, the Fe 3 O 4 /GO/Ag composite microspheres were employed to quantitatively detect aromatic molecules, methylene blue (MB) in aqueous solution, showing the limit of detection was low down to 10 −9 M and the correlation coefficients (R 2 ) of the linear relationship between SERS intensities and logarithmic concentrations was high up to 0.91. Moreover, the Fe 3 O 4 /GO/Ag composite microspheres as catalysts completely degraded methylene blue and ciprofloxacin in 12 min with the presence of NaBH 4 . Finally, Fe 3 O 4 /GO/Ag composite microspheres were utilized to effectively follow the degradation reaction process of MB by SERS. Taken together, Fe 3 O 4 /GO/Ag composite microspheres present SERS application potentials in terms of trace and quantitative detection of chemicals, and in-situ monitoring catalytic degradation of organic pollutants.
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Nanomaterials
·
2021
·Vol. 11
·期 6
·1609
·
IF 5.076
Wei Zhu,Xueliang Jiang,Kun Jiang,Fangjun Liu,Feng You,Chu Yao
A highly efficient adsorbent for methylene blue (MB) adsorption was developed by combination of carboxymethyl cellulose (CMC) and graphene oxide (GO) via a simple one-step hydrothermal method. The as-synthesized CMC/GO composite aerogel has a mesoporous structure with an average pore diameter of 30 nm and a high specific surface area of 800.85 m2·g−1. Moreover, the CMC/GO composite aerogel demonstrates a significant selectivity for the dye adsorption, especially for MB, where its adsorption capacity can reach 244.99 mg·g−1with an excellent recyclability for more than nine times. Thus, the prepared CMC/GO composite aerogel would be an effective adsorbent for dyes adsorption, owing to the merits of high efficiency, reusability, and eco-friendliness.Keywords:adsorption;aerogel;carboxymethyl cellulose;graphene;methylene blue;reusability
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SENSORS
·
2020
·Vol. 20
·期 19
·5506
·
IF 3.275
Yufeng Hu,Hanwen Xing,Gang Li,Minghuo Wu
Tiny changes in the mass of the sensor in a quartz crystal microbalance with dissipation monitoring (QCM-D) can be observed. However, the lack of specificity for target species has hindered the use of QCM-D. Here, molecularly imprinted polymers (MIPs) were used to modify a QCM-D sensor to provide specificity. The MIPs were formed in the presence of sodium dodecyl benzene sulfonate. Imprinted layers on Fe3O4nanoparticles were formed using pyrrole as the functional monomer and cross-linker and methylene blue (MB) as a template. The MIPs produced were then attached to the surface of a QCM-D sensor. The MIPs-coated QCM-D sensor could recognize MB and gave a linear response in the concentration range 25 to 1.5 × 102µg/L and a detection limit of 1.4 µg/L. The QCM-D sensor was selective for MB over structural analogs. The MIPs-coated QCM-D sensor was successfully used to detect MB in river water and seawater samples, and the recoveries were good. This is the first time MB has been detected using a QCM-D sensor. Mass is an intrinsic property of matter, so this method could easily be extended to other target species by using different MIPs.Keywords:groundwater;magnetic imprinted polymers;methylene blue;quartz crystal microbalance;surfactant
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POWDER TECHNOLOGY
·
2021
·
IF 5.134
Ting Zhang,Qingqing Ma,Mengqi Zhou,Changyu Li,Jianchao Sun,Weijie Shi,Shiyun Ai
Rationally designing efficient nanomaterials for heterogeneous activation of peroxymonosulfate (PMS) is necessary for environmental remediation. Nitrogen-containing carbon/FeCo 2 O 4 composites (FeCo 2 O 4 -N-C) were prepared by annealing the iron and cobalt in the ZIF-67 (Fe-Co-ZIF) precursor at different reaction temperatures. In the presence of PMS, 400 °C calcined nitrogen-containing carbon/FeCo 2 O 4 composites (FeCo 2 O 4 -N-C-400) was used as catalyst for heterogeneous Fenton degradation of methylene blue (MB) and nearly 100% MB was removed within 10 min without pH adjustment. FeCo 2 O 4 -N-C-400 had excellent catalytic activity profiting from the uniform distribution of bimetals and nitrogen doping, which ensured the exposure of sites with high catalytic activity. Free radical quenching experiments showed that a large number of reactive oxygen species (SO 4 .- and . OH) were the cause of pollutant degradation. At the same time, the possible degradation mechanism of MB in FeCo 2 O 4 -N-C-400/PMS system was proposed. In addition, FeCo 2 O 4 -N-C-400 can still degrade 60% of MB after four cycles, which indicated that the catalyst had long-term catalytic durability and recyclability.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 2
·2026-2040
·
IF 2.478
Zhang He,Qian Jianhua,Zhang Jie,Xu Jiasheng
TiO 2 @Sn(Sb)O 2 core–shell composites (TiO 2 @SnO 2 , TiO 2 @Sb 2 O 4 and TiO 2 @Sb-SnO 2 ) have been prepared through a chemical co-precipitation method with a calcination process. The mixture hydrolysates of SnCl 4 and SbCl 3 have been deposited on the surface of TiO 2 as the precursor. These hydrolysates have been converted to Sn(Sb)O 2 particles, leading to the formation of the TiO 2 @Sn(Sb)O 2 core–shell structure. Their electrochemical performances and electrocatalytic degradation efficiencies of methylene blue (MB) have been investigated. It is found that TiO 2 @Sb-SnO 2 electrode presents a larger effective electrocatalytic area and more electroactive sites, which provide more contact points between the pollutant and electrode and enhance electrocatalytic oxidation activity. The TiO 2 @Sb-SnO 2 electrode exhibits a higher degradation efficiency (97.6%) than that of TiO 2 @SnO 2 (80.1%) and TiO 2 @Sb 2 O 4 (34.9%). The TiO 2 @Sb-SnO 2 electrode provides a 91.1% degradation efficiency after five cycles test, indicating a high stability during degradation process. These results show that the as-prepared TiO 2 @Sb-SnO 2 electrode can provide a promising application to treat dye wastewater, which relies on its core–shell structure.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
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IF 3.99
Mingyang Chen,Yong Shen,Lihui Xu,Guanghong Xiang,Zhewei Ni
Adsorption treatment of dyes from industrial effluent by hydrogel adsorbent has been a research hotspot, but few high-performance hydrogel adsorbents with high adsorption capacity have been reported. Previously reported poly (acrylic acid) PAA-based hydrogel adsorbents show a low swelling ratio due to the unsatisfactory cross-linked structure, which causes a passive impact on the exhibit of adsorptive sites and the penetration of water inside the hydrogel. Herein, we prepared a novel super-adsorbent nanocomposite (NC) hydrogel adsorbent by employing vinyl hybrid silica nanoparticles (VSNPs) with average diameter of 30 nm as crosslinking agent. The introduction of an optimal content of VSNPs effectively forms a well three-dimensional network structure. The structure system of our NC hydrogel effectively promotes the active sites on the polymer chains to be exposed to dye molecules. Thus, the NC hydrogel adsorbent achieved a high adsorption capacity of 1690 mg/g for adsorbing methylene blue and obtain a high removal ratio of 90 % within 40 min. Furthermore, the hydrogel exhibits excellent reusability after 4 repeated cycles of adsorption and desorption. The work confirmed that the VSNPs can build a well covalent hybrid cross-linked system of a PAA-based hydrogel without other organic crosslinkers and further provided a new method to develop novel hydrogel adsorbent with enhanced adsorption capacity for removing organic dyes from industrial wastewater.
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ACS Omega
·
2020
·
IF 2.87
Lu Lu Xiong,Rong Huang,Hui Hui Chai,Ling Yu,Chang Ming Li
A facile, cost-effective, and eco-friendly method was proposed to synthesize Fe3O4@tannic acid@Au nanocomposites (Fe3O4@TA@Au). First, Fe3O4 nanoparticles with diameters of 20 and 200 nm were synthesized by co-precipitation and solvothermal methods, respectively. Gold nanoparticles were deposited on magnetic Fe3O4 through tannic acid-metal-polymer intermediate-layer-mediated reductions. The catalytic activities of the as-prepared Fe3O4@TA@Au were investigated by spectroscopically monitoring the reduction of 4-nitrophenol (4-NP) and methylene blue (MB), which could be achieved within several minutes with an excess of NaBH4. The impact of the Fe3O4 size on the overall catalytic ability of the Fe3O4@TA@Au was systematically studied. The reaction rate constants of the Fe3O4-20 nm@TA@Au for 4-NP and MB reduction were 0.432 and 0.543 min–1, respectively. For the Fe3O4-200 nm@TA@Au nanocomposite, the optimized reaction rate constants for 4-NP and MB reduction were 3.09 and 0.441 min–1, respectively. Due to magnetic separation, the Fe3O4@TA@Au could be easily harvested and recycled. After five recycling cycles, the catalytic ability remained over 90%, and the recycling process could be completed in several minutes, highlighting its potential as a catalyst for 4-NP and MB removal.
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