WATER RESEARCH
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2022
·
IF 13.4
Zheng-Yu Dong,Yi-Li Lin,Tian-Yang Zhang,Chen-Yan Hu,Yang Pan,Zheng-Xiong Zheng,Yu-Lin Tang,Bin Xu,Nai-Yun Gao
Permanganate (Mn(VII)) is widely used as a mild oxidant in water treatment. However, the reaction rates of some emerging contaminants with Mn(VII) are extremely low. In this study, benzoquinone (BQ), a redox mediator with the important component in dissolved organic matter (DOM), enhanced the oxidation of bisphenol A (BPA) by Mn(VII) in a wide pH range of 4.0-10.0. The redox cycle of BQ would produce semiquinone radicals, which could act as ligands to stabilize the formed Mn(III) in the system to promote the oxidation of BPA. Notably, the presence of BQ might promote the formation of MnO 2 . A novel mechanism was proposed that singlet oxygen ( 1 O 2 ), Mn(III)-ligands (Mn(III)-L) and in-situ formed MnO 2 were the main contributors to accelerate BPA degradation in the Mn(VII)/BQ system. Under acidic conditions, the in-situ formed MnO 2 involved in the redox reaction and part of the Mn(IV) was reduced to Mn(III), indicating that the electron transfer of BQ promoted the formation of active Mn species and enhanced the Mn(VII) oxidation performance. Semiquinone radicals generated by BQ transformation would couple with the hydrogen substitution products of BPA to inhibit BPA self-coupling and promote the ring-opening reactions of BPA. Mn(VII)/BQ had better effect in raw water than in pure water, indicating that the Mn(VII)/BQ system has high potential for practical application. This study provided insights into the role of DOM in enhancing the Mn(VII) oxidation in water treatment.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·1852-1864
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IF 11.806
Zhang Feng,Lian Mengying,Alhadhrami A.,Huang Mina,Li Bin,Mersal Gaber A. M.,Ibrahim Mohamed M.,Xu Miaojun
Enzyme immobilization technique has a broad application prospect in the area of biotechnology, biochemistry, and environmental remediation. In this study, the composite hydrogel consisting of dopamine functionalized cellulose nanofiber and alginate was fabricated for immobilization of laccase. Infrared spectra, scanning electron micrographs, and energy dispersive X-ray analysis demonstrated that the laccase molecules were covalently immobilized onto the surface of composite hydrogel. The immobilized laccase exhibited the highest enzymatic activity about 462 U·g −1 . Compared with free laccase, the pH, temperature, and storage stabilities of immobilized laccase were improved dramatically. Moreover, the immobilized enzyme can be easily separated from reaction system and reused. It retained 79.6% of its initial activity after 14 cycles of operation. Immobilized laccase was utilized for efficient degradation of bisphenol A (BPA) from polluted water, and the affecting factors on BPA removal efficiency were analyzed. Greater than 82% of BPA was removed under optimum conditions. A small amount of ABTS was added into BPA degradation; the removal efficiency had reached up to 98.7%. Results indicated that the immobilized laccase has great potential for industrial applications. Graphical abstract
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Foods
·
2022
·Vol. 11
·期 9
·1178
·
IF 5.561
Xiaoqi Li,Shuyuan Du,Fangyuan Tian,Minglu Wang,Ying Wang,Hongyan Zhang,Liguo Zang
The residue of estrogenic-disrupting compounds (EDCs) that are secreted by cows, added as drugs, and present in the feed may exist in dairy products. A gold nanoparticles (AuNPs)-estrogen receptor (ER) cocktail colorimetric assay equipped with ER cocktail solid phase extraction (SPE) was established to screen EDCs. Nine EDCs with high, moderate, and low estrogenic activity were selected to be the representative targets. The recognition range of the colorimetric assay combined with the ER cocktail SPE was wider than that of a single ERα or ERβ. The lowest detection limit of the established assay was about 10−9mg·mL−1. The detection limits of estrone, bisphenol A, and bisphenol B were about one order of magnitude lower than the method based on a single ER. The recoveries of the spiked nine EDCs were between 80.0% and 110.0%, and daidzein was identified in the dairy product. The developed method has potential application prospects in food safety and environmental monitoring.Keywords:estrogenic-disrupting compounds;estrogen receptor cocktail;solid phase extraction;gold nanoparticles colorimetric assay;dairy products
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Journal of Cleaner Production
·
2022
·
IF 11.072
Qingxin Xu,Xuejiao Liu,Dengguo Lai,Zhenjiao Xing,Pamphile Ndagijimana,Zhiwei Li,Yin Wang
It is of vital importance for industrial applications by developing simple, robust, economic, eco-friendly and easy scale-up methods for fabricating hydrophobic mesoporous activated carbon (MAC) from sustainable raw materials with high adsorption performance for bulky organic pollutants removal . Herein, a novel one-step facile approach coupling carbothermal reduction with catalytic activation was firstly established for preparing the coconut shell-based hydrophobic MAC modified with nanoscale zero-valent iron (NZVI@MAC). The in-situ synthesized NZVI (merely 0.33 wt%) by carbothermal reduction could not only catalyze the gasification reaction between carbon and CO 2 to fabricate MAC (d BET = 5.17 nm, S BET = 933.12 m 2 g −1 ), but also catalyze the amorphous carbon to form hydrophobic graphitic layers covering its surface. In striking contrast to the unmodified activated carbon, the NZVI@MAC surprisingly exhibited a remarkably 8.62-fold higher initial adsorption rate and a slightly increased adsorption capacity of 327.60 mg g −1 for bisphenol A (BPA). Intriguingly, the high mesoporous proportion (70–90%) of NZVI@MAC with the average pore size of 4.1–5.2 nm was effective in reducing the diffusion resistance for BPA. Such high adsorption performance under neutral conditions was primarily attributed to the strong hydrophobic interaction , π-π interaction and the weak hydrogen bonding. Moreover, the NZVI@MAC showed robust anti-interference properties in actual environmental conditions containing various inorganic ions and in a wide pH range (3–10). Therefore, the cost-effective, eco-friendly, sustainable and recyclable hydrophobic NZVI@MAC with stable structure and excellent performance for bulky organic adsorption is a promising material for practical applications, especially in drinking water purification.
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CHEMOSPHERE
·
2022
·
IF 8.943
Jinghan Guo,Boyao Zhou,Shuangying Li,Yayan Tong,Zhi Li,Menghua Liu,Yanhui Li,Tongxu Qu,Qingxiang Zhou
Present work depicted a novel electrochemical sensor fabricated with magnetic carbon dots (M-CDs) and cetyltrimethylammonium bromide (CTAB) modified glassy carbon electrode (GCE) for selective measurement of 3,3′,5,5′-tetrabromobisphenol A (TBBPA) in beverages. The M-CDs composite material revealed good electrocatalytic activity, and CTAB has strong hydrophobic interaction which enable it have good enrichment capacity of hydrophobic compounds, and combination of them further enhances the electrochemical signal. Hence CTAB decoration can markedly improve the detection performance of TBBPA. Electrochemical properties of the fabricated sensor was investigated through performing cyclic voltammetry (CV). The morphology and functional groups of the modified materials were examined with transmission electron microscope (TEM) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the synthesized material had a spherical-like structure, good dispersion properties and plenty of functional groups on the surface. The effects of incubation potential, incubation time, pH of electrolyte, and scanning rate on oxidation peak current were investigated. Under optimal conditions, the designed sensor had good linear range of 1 nM–1000 nM, and the detection of limit of the constructed sensor was 0.75 nM. The constructed sensor was utilized to detect TBBPA in vitamin water, scream drink and genki forest, and satisfactory detection performance had been achieved.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Zhendong Zhao,Wenjun Zhou,Daohui Lin,Lizhong Zhu,Baoshan Xing,Zhiqi Liu
High metal loading of single-atom catalysts enables excellent catalytic activity, but possibly causes serious aggregation problem. Herein, a series of diatomic FeCo−N/C-x (x represents metal content) were skillfully designed and applied to improve the catalytic activity for peroxymonosulfate (PMS) activation toward degrading organic micropollutants. The unprecedented dual active sites, referring to Fe(N 3 )−Co(N 3 ) moiety and FeCo alloy, are constructed on the obtained FeCo−N/C-x, thereby exhibiting significantly greater performance toward degrading aqueous phenol (e.g., 0.316 min −1 for FeCo−N/C-3) via PMS activation, compared with those of traditional single-atom Co−N/C (0.011 min −1 ) and Fe−N/C (0.018 min −1 ). Combined experimental and theoretical calculations demonstrate the independent functions of dual active sites, in which Fe(N 3 )−Co(N 3 ) and FeCo alloy can decrease the energy barrier of O−O bond cleaving resulting in the formation of high-valent FeCo O reactive species and singlet oxygen, respectively. This study opens up a new platform toward constructing dual active sites for enhanced Fenton-like catalytic activity.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Lu Zhao,Hanlin Zhang,Zhipeng Dai,Ai-Yong Zhang,Jiao Yin,Shuchuan Peng,Heng Liang
The efficient recycling of agricultural chestnut shell waste is of considerable interest due to its large availability and economic feasibility. Herein, an alkaline-activated biochar was thermally prepared using chestnut shell by finely regulating main conditions; its morphological, structural and physic-chemical properties were well characterized. Fenton-like capacity to trigger peroxymonosulfate activation for superior pollutant degradation with high efficiency and good selectivity was validated in different water matrix. Both radical formation and electron transfer were identified as reaction pathways, while the selective non-radical mechanism played the major role in pollutant degradation. Surface ketonic groups were identified as the main reactive sites for non-selective radical production, while crystal edges and structural defects on sp 2 /sp 3 carbon network could smoothly mediate the selective electron transfer from pollutant to oxidant in the non-radical Fenton-like catalysis. The two-mixed radical/non-radical pathways exhibited important advantages for environmental decontamination , in comparison with the one-single radical or non-radical mechanism. Our study provided a promising recycling strategy for agricultural chestnut shell, as well as an environment-friendly catalyst for heterogeneous Fenton-like catalysis in green water purification rendered by the synergistic radical/non-radical reaction pathways.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
·
IF 4.383
Bing Xiao,Minghao Xu,Bin Lu,Yun Wang,Hui Liu,Rufen Chen
Economical elimination of organic pollutants from waste water has be paid more attention owing to its environmental and ecological significance. In this study, an easily achievable process to in-situ fabricate copper and co-modified Z-scheme BiOCl/Bi 2 O 3 heterojunction was proposed. The study on the formation mechanism indicated that the introduction of copper ions is favorable for the formation of Bi-based catalyst with flaky morphology while the addition C-dots makes the nanosheets loosely be packed and intercrossed each other. The composite exhibited a high degradation efficiency for Bisphenol A (BPA) and 91% of BPA was removal within 35 min under xenon lamp irradiation. The excellent photocatalytic performance was attributed to the synergistic effect of the in-situ formation Z-scheme BiOCl/β-Bi 2 O 3 heterojunction, multiple charge transfer channels including Cu 2+ /Cu + and C-dots, and efficient charge separation. The electron paramagnetic resonance (EPR) analysis and quenching tests revealed that O 2 •− play a main role in degradation of BPA. Based on the experimental results, the photo-catalytic mechanism is proposed and the degradation path of BPA is revealed.
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Small
·
2022
·Vol. 18
·期 9
·2104941
·
IF 15.153
Lixue Yang,Haoqi Yang,Shengyan Yin,Xiuyan Wang,Mingwei Xu,Guolong Lu,Zhenning Liu,Hang Sun
The Fenton-like reaction has great potential in water treatment. Herein, an efficient and reusable catalytic system is developed based on atomically dispersed Fe catalyst by anchoring Fe atoms on nitrogen-doped porous carbon (Fe SA/NPCs). The catalyst of Fe SA/NPCs exhibits enhanced performance in activating peroxymonosulfate (PMS) for organic pollutant degradation and bacterial inactivation. The Fe SA/NPCs + PMS system demonstrates a high turnover frequency of 39.31 min −1 in Rhodamine B (RhB) degradation as well as a strong bactericidal activity that can completely sterilize an Escherichia coli culture within 5 min. Meanwhile, the degradation activity of RhB by Fe SA/NPCs is improved up to 28 to 371-fold in comparison with the controls. Complete degradation of RhB can be achieved in 30 s by the Fe SA/NPCs + PMS system, demonstrating an efficiency much higher than most traditional Fenton-like processes. Experiments with different radical scavengers and density functional theory calculations have revealed that singlet oxygen ( 1 O 2 ) generated on the N-coordinated single Fe atom (Fe-N 4 ) sites is the key reactive species for the effective and rapid pollutant degradation and bacterial inactivation. This work innovatively affords a promising single-Fe-atom catalyst/PMS system for applying Fenton-like reactions in water treatment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 31
·47549-47560
·
IF 5.19
You Wenqiao,Li Youlin,He Dandan,Zeng Youmei,Zhu Jiangwei,You Xiaofeng,Wang Kang,Zhou Guangming,Peng Guilong
In the present study, pyrophosphate (PP) was used to activate peroxymonosulfate (PMS) for acid orange 7 (AO7) removal under neutral pH conditions. The removal rate of AO7 (20 mg/L) was 84% within the reaction time with a rate constant value of 0.0165 min −1 under optimum conditions. Additionally, the effects of the concentrations of PMS and PP in solutions with various pH values and the coexisting inorganic anions on AO7 removal were measured. In addition, the performance of phosphate (P(V)) on PMS activation was compared with that of phosphite (P(III)) species. In contrast to P(III), the concentration of P(V) showed a positive correlation with the efficiency of AO7 decolorization. PMS activation in different types of buffer solutions was also examined, and the results indicated that the decolorization efficiency of AO7 induced by PP addition, and the buffer solution also contributed to PMS self-decomposition. Singlet oxygen ( 1 O 2 ) might be the primary reactive oxygen species (ROS) in the PP/PMS system in which AO7 is decolorized at an initial pH of 7.06, as indicated by quenching experiments and electron spin resonance (ESR) tests. Therefore, PP/PMS systems may be promising technologies for removing organic contaminants, particularly for PP-rich electroplating wastewater.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 12
·2102036
·
IF 6.389
Qi Ouyang,Qilin Gui,Chang Liu,Xiaonong Chen
Endocrine disruptors (EDCs) are widely detected in water resources owing to the abuse of plastic products, posing a serious global concern. Unfortunately, the rapid, effective, and economical removal of trace EDCs from water remains a significant challenge. Herein, a novel adsorptive membrane (PVPM) with excellent recyclability and stability is prepared by the UV-initiated grafting of poly(N-vinylpyrrolidone) (PNVP) onto the surface of polypropylene fibrous membrane (PPM). The PVPM exhibits high flux, low-pressure drop, and excellent adsorption performance. It can efficiently capture trace (10 µg L −1 ) EDCs with a removal efficiency of 99%. Notably, the adsorption performance of the PVPM remains unchanged even in river water. A mechanism for the adsorption is proposed based on adsorption kinetics and thermodynamics. Specifically, dynamic hydrophobic microdomains are generated between amphiphilic PNVP and EDCs and form co-aggregates on the PPM substrate. This co-aggregation is responsible for the large adsorption capacity for EDCs. A large decrease in the free energy (−16.65 kJ mol −1 ) of the adsorption process provides additional evidence for the strong adsorption affinity of the PVPM to EDCs. This study introduces a new pathway for designing low-cost and high-performance membrane adsorbents for prompt and efficient capture of trace EDCs from water.
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Journal of Environmental Sciences
·
2022
·
IF 6.796
Fuyou Du,Zhan Lai,Huiyang Tang,Haiyan Wang,Chenxi Zhao
In this work, a novel dual Z-scheme Bi 2 WO 6 /g-C 3 N 4 /black phosphorus quantum dots (Bi 2 WO 6 /g-C 3 N 4 /BPQDs) composites were fabricated and utilized towards photocatalytic degradation of bisphenol A (BPA) under visible-light irradiation. Optimizing the content of g-C 3 N 4 and BPQDs in Bi 2 WO 6 /g-C 3 N 4 /BPQDs composites to a suitable mass ratio can enhance the visible-light harvesting capacity and increase the charge separation efficiency and the transfer rate of excited-state electrons and holes, resulting in much higher photocatalytic activity for BPA degradation (95.6%, at 20 mg/L in 120 min) than that of Bi 2 WO 6 (63.7%), g-C 3 N 4 (25.0%), BPQDs (8.5%), and Bi 2 WO 6 /g-C 3 N 4 (79.6%), respectively. Radical trapping experiments indicated that photogenerated holes (h + ) and superoxide radicals (•O 2 − ) played crucial roles in photocatalytic BPA degradation. Further, the possible degradation pathway and photocatalytic mechanism was proposed by analyzing the BPA intermediates. This work also demonstrated that the Bi 2 WO 6 /g-C 3 N 4 /BPQDs as effective photocatalysts was stable and have promising potential to remove environmental contaminants from real water samples.
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