ACS ES&T Water
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2025
·
IF 4.3
Cheng-Xin Chen,Han-Jun Sun,Jie Ding,Chen-Hao Cui,Jia-Yi Wang,Xian Zhao,Geng Luo,Yi-Lin Zhao,Yan Li,Yuan Tian,Ji-Wei Pang,Nan-Qi Ren,Shan-Shan Yang
The activation of persulfate by nonmetallic carbon-based catalysts has emerged as a promising strategy for the efficient degradation of organic contaminants in wastewater. In this study, amine-functionalized graphene (AGR) was synthesized via a facile reduction of graphene oxide (GO) using diethylenetriamine (DETA), which incorporated nitrogen-containing functional groups to enhance catalytic performance. Comprehensive characterization confirmed the partial removal of oxygen-containing groups from GO and the successful incorporation of amine functionalities. The synthesized AGR was employed as a highly effective catalyst for peroxydisulfate (PDS) activation, achieving an impressive 86.3% removal efficiency of sulfamethoxazole (SMX) within 60 min, with a reaction rate constant of 0.029 min–1. Notably, the catalyst demonstrated excellent recyclability, maintaining consistently high SMX removal efficiency after regeneration. The superior catalytic performance of AGR was primarily attributed to the introduction of amine groups, which facilitated charge redistribution within the graphene framework, thereby promoting efficient electron transfer between SMX and PDS. Electrochemical analyses and reactive species identification revealed that SMX degradation was primarily governed by nonradical mechanisms, including electron transfer and the generation of singlet oxygen (1O2). This study provides critical insights into the design of robust carbon-based catalysts with enhanced stability and reduced susceptibility to environmental interferences.
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高影响因子
JOURNAL OF CONTAMINANT HYDROLOGY
·
2025
·
IF 4.4
Jianxin Fan,Jiaxin Yang,Ting Duan,Yuchen Gong,Jiaoxia Sun
The widespread use of sulfamethoxazole (SMX) has led to pervasive antibiotic contamination in aquatic environments, where suspended particulate matter (SPM) serves as a critical mediator in the retention, transport, and fate of antibiotic pollutants within riverine ecosystems. However, existing research predominantly emphasizes adsorption mechanisms under static batch equilibrium conditions, overlooking the dynamic interplay between SPM and antibiotics across hydrodynamic conditions regimes.Thus, the dynamic adsorption process of SMX on SPM was investigated through a series of annular flume experiments, and the MIKE 21 model was employed to simulate the migration of SMX and SPM. Results showed that the SMX adsorption amounts decreased significantly with increasing flow velocity, and the SMX desorption would occur when hydrodynamic conditions changed suddenly, especially for the continuous enhancement in velocity. As hydrodynamics stabilized, the re-adsorption of SMX would occur. The adsorption process of SMX was related with the property changes of SPM, and the enhancement of hydrodynamic conditions can significantly weaken the surface complexation between SPM and SMX, further resulting in a decrease in the SMX adsorption amounts. Meanwhile, high flow velocity would cause more obvious pore filling of SMX on SPM and led the clearer SMX adsorption fluctuations under the varying the hydrodynamic conditions. The MIKE 21 simulations identified that the continuous enhanced hydrodynamics significantly prolonged the interaction time between SMX and SPM, while the weak hydrodynamics and high SPM concentrations could particularly slow the SMX diffusion downstream.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Xiudan Liu,Longjun Rao,Yuyuan Yao,Haixiang Chen
Developing an efficient and metal-free bifunctional catalyst for the simultaneous degradation of antibiotic and reduction of Cr (VI) has been regarded as increasingly attractive yet challenging objectives in the environmental catalysis field. Herein, phosphorus-doped carbon fibers (P-CFs) was innovatively prepared by doping and calcination methods, characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy . Sulfamethoxazole (SMX) as the target contaminant was selected to evaluate the catalytic activity of P-CFs in PMS activation , over 90% SMX removal and 82.75% mineralization were high-efficiently achieved in the P-CFs/peroxymonosulfate (PMS) system. Particularly, P-CFs/PMS system exhibited a superior catalytic oxidation performance over a wide pH range (3.5–9.5) and even in the complicated water matrix. Surprisingly, the presence of humic acid (HA) in the P-CFs/PMS system could achieve about 2 times enhancement on SMX removal, different from most reports about the inhibition of HA in PMS activation. More importantly, Brunauer−Emmett−Teller (BET) method and XPS analysis revealed that the highly toxic Cr (VI) could be reduced to Cr (III) by P-CFs. Furthermore, electron spin resonance (ESR) combined with various trapping agents demonstrated that SO 4 • − , •OH and 1 O 2 . were generated and participated in the SMX degradation , while the free electron in P-CFs played a main role in Cr (VI) reduction. This finding not only provided a high-efficiency strategy in the treatment of wastewaters containing organic contaminants and heavy metals Cr (VI), but might open new insights into an innovative metal-free catalyst in environment remediation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 28
·13767-13784
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IF 3.553
Li Yulian,He Junyong,Zhang Kaisheng,Hong Peidong,Wang Chengming,Kong Lingtao,Liu Jinhuai
Abstract Magnetic porous manganese ferrite nanoparticles (Mn x Fe 3-x O 4 ) with diverse ingredient Mn/Fe mole ratios were synthesized to degrade sulfamethoxazole (SMX) antibiotic residues involving peroxymonosulfate (PMS) dissociation to produce free radical SO 4 •− , • OH and singlet oxygen 1 O 2 in the absence of heat and light. With the increase in proportion of manganese, the degradation efficiency of SMX increased from 19 to 70% in 30 min. The removal efficiency of SMX increased following the concentration increase of PMS (from 1 ~ 10 mM). After 60 min, the total organic carbon went down by 20%, and the concentration of NH 4 + and NO 3 − accumulated obviously simultaneously. EPR study and chemical probe method, depending on scavenging revealed that SO 4 •− , • OH and 1 O 2 were generated and contributed to the degradation system. Based on the capture of eleven decomposition by-products by LC/MS, two different degradation pathways of SMX were determined, mainly consisting of cleavage of the S–N bond, hydroxylation of benzene and heterocyclic ring, oxidation of amino group and ring-opening cleavage processes. The nanoparticle reuse tests showed that the porous magnetic manganese ferrite nanoparticles could still maintain a high degradation efficiency after five oxidative degradation reactions. The magnetic porous manganese ferrite nanocrystals could activate the PMS to oxidize SMX antibiotic residue without additional energy. Graphic abstract
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高影响因子
ENVIRONMENTAL POLLUTION
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2018
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IF 4.358
Zhendong Zhao,Wenjun Zhou
Biochars produced from wheat straw at 400 °C (BC400) and 700 °C (BC700) were treated with three typical soil minerals to examine the effects of soil minerals on biochar properties and adsorption capacity for sulfamethoxazole (SMX). Mineral treatment enlarged the surface area and pore size of biochar, and the electron donating capacity (EDC) of the mineral-treated biochars also increased due to the increased phenolic group in BC400 and the enhanced conjugated π-electron system in BC700, respectively, which in turn affected the adsorption capacity of biochars for SMX. The adsorption of SMX on BC700 was increased after mineral treatment due to the facilitating effect of π–π electron donor-acceptor interaction as indicated by the positive correlation of surface adsorption amount ( Q A ) of SMX with EDC of biochars ( R 2 = 0.92–0.96). In contrast, mineral treatment decreased SMX adsorption on BC400, which could be attributed to the potential association of organic matter with minerals via coprecipitation and adsorption, in addition to the weak adsorption capacities of soil minerals for SMX. These results can provide a new insight for better understanding the interaction between biochar and soil minerals and its effect on adsorption capacity of biochar for organic pollutants.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qidi Liu,Jun Hou,Jun Wu,Lingzhan Miao,Guoxiang You,Yanhui Ao
The inefficiency of conventional biological treatment for removing sulfamethoxazole (SMX) is posing potential risks to ecological environments. In this study, an intimately coupled photocatalysis and biodegradation (ICPB) system consisting of Fe 3+ /g-C 3 N 4 and biofilm was fabricated for the treatment of synthetic domestic wastewater containing SMX. The results showed that this ICPB system could simultaneously remove 96.27 ± 5.27% of SMX and 86.57 ± 3.06% of COD, which was superior to sole photocatalysis (SMX 100%, COD 4.2 ± 0.74%) and sole biodegradation (SMX 42.21 ± 0.86%, COD 95.1 ± 0.18%). Contributors to SMX removal in the ICPB system from big to small include LED photocatalysis, biodegradation, LED photolysis, and adsorption effect of the carrier, while COD removal was largely ascribed to biodegradation. Increasing initial SMX concentration inhibits SMX removal rate, while increasing photocatalyst dosage accelerates SMX removal rate, and both had no impact on COD removal. Our analysis of biofilm activity showed that microorganisms in this ICPB system maintained a high survival rate and metabolic activity, and the microbial community structure of the biofilm remained stable, with Nakamurella and Raoultella being the two dominant genera of the biofilm. This work provides a new strategy to effectively treat domestic wastewater polluted by antibiotics.
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高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Junwei Liu,Xinyue Yang,Tao Gao,Yuehan Zhang,Dandan Pan,Jian He,Xiangwei Wu
The widespread use of sulfamethoxazole (SMX) has raised significant concerns regarding environmental residue pollution and the emergence of bacterial antibiotic resistance. Anaerobes play crucial roles in the biogeochemical element cycle and the degradation of organic pollutants; however, the pure-cultured anaerobes involved in SMX anaerobic degradation and their underlying mechanisms remain largely unknown. In this study, a novel anaerobic bacterium, Cupidesulfovibrio sp. strain SA-9, was isolated and characterized for its ability to degrade SMX. Strain SA-9 preferentially utilized lactate or pyruvate as electron donors and sulfate, nitrate, or carbonate as electron acceptors to drive SMX degradation. The degradation T 1/2 values of SMX at concentrations ranging from 10 to 800 μM were between 6.0 and 17.2 d under optimal conditions which included pH 7.0-8.0, 30–37°C, sulfate as the electron acceptor, and pyruvate as the electron donor. Strain SA-9 degraded SMX via isoxazole ring cleavage, acetylation, and hydroxylation, and the ECOSAR-predicted results and bacterial growth inhibition assays indicated that these pathways was detoxifying. Multi-omics analysis and heterologous expression revealed that strain SA-9 degraded SMX via a reductive transformation pathway fueled by electron donors oxidized through the TCA cycle, with electrons transferred through a chain involving flavin-dependent thymidylate synthase (FDTS) and ferredoxin (Fd) to reduce electron acceptors that provide reducing power for SMX degradation. Furthermore, the degradation half-life ( T 1/2 ) values of SMX at 10 and 50 μM were 1.7 and 1.8 d in actual wastewater. Strain SA-9 significantly enhanced SMX removal and mitigated the dissemination risk of ARGs sul1 and sul2 in actual wastewater. This study elucidates the anaerobic microbial resistance mechanism to SMX and highlights the potential of strain SA-9 for the bioremediation of SMX-contaminated water.
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高影响因子
Journal of Water Process Engineering
·
2019
·
IF 3.173
Senlin Ma,Xingtao Zuo,Juan Xiong,Cong Ma,Zhongbing Chen
An ozonation process combined with hydrophobic adsorbent high silica ZSM-5 (HSZSM-5) was designed to enhance sulfamethoxazole (SMX) removal and reduce the ozone consumption. The promoted effect of HSZSM-5 on SMX removal was investigated in terms of SMX removal and TOC removal efficiency as well as the ozone consumption. The impacts of pH and CO 3 2− /HCO 3 - were also analyzed. The presence of HSZSM-5 helped to increase the SMX degradation and TOC removal efficiency and their kinetics rate constants. HSZSM-5 adsorption behaviors for SMX and its degradation intermediates were responsible for the findings. Direct ozone oxidation was the main mechanism of SMX removal as HZSM-5 could not contribute to producing H 2 O 2 and •OH. Much higher CO 3 2− /HCO 3 - concentration (≥10 mM) and pH value (>7) were in favor of SMX degradation. HSZSM-5 had a positive contribution to SMX removal. The mass ratio of ozone consumption to the removed SMX reduced to 0.63 g O 3 /g SMX. This system of introducing high silica zeolite in the ozonation/adsorption process is an environmentally and economically sound technology to removal micropollutants.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 35
·52995-53008
·
IF 5.19
Xia Xinjing,Deng Lin,Yang Lingfang,Shi Zhou
Using MXene as substrate, CoOOH@MXene with different mass content of CoOOH were prepared and used to active peroxymonosulfate (PMS) for the sulfamethoxazole (SMX) degradation. The sample characterizations demonstrated the successful preparation of CoOOH@MXene. CoOOH@MXene possessed much higher BET surface area (183.82 m 2 /g) than CoOOH (85.36 m 2 /g) and MXene (6.89 m 2 /g) due to the good dispersibility of CoOOH particles on MXene. Due to its large surface area, 1.3CoOOH@MXene displayed the best catalytic performance for the degradation of SMX. With 0.2 g/L of 1.3CoOOH@MXene and 0.5 mM of PMS, 20 μM of SMX was completely eliminated in 10 min. The degradation followed pseudo-first-order kinetic model well, with rate constants of 0.33 min −1 for 1.3CoOOH@MXene and 0.054 min −1 for CoOOH. Influencing factors of initial pH, catalyst dosage, PMS concentration, SMX concentration, and co-existing anions on SMX degradation were assessed systematically. Recycling tests verified the excellent reusability and stability of the catalyst. Quenching experiments and electron paramagnetic resonance analysis substantiated that 1 O 2 played a leading role. Moreover, the intermediates were identified, and degradation pathways and activation mechanism of CoOOH@MXene for PMS were proposed. This work may highlight the application of MXene with transition metals in PMS activation.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiaolong Yu,Xu Jin,Nan Wang,Yuanyuan Yu,Xifen Zhu,Meiqin Chen,Yongming Zhong,Jianteng Sun,Lizhong Zhu
The threat caused by the misuse of antibiotics to ecology and human health has been aroused an extensive attention. Developing cost-effective techniques for removing antibiotics needs to put on the agenda. In current research, the degradation mechanism of sulfamethoxazole (SMX) by sulfidated nanoscale zerovalent iron (S-nZVI) driven persulfate, together with the potential risk of intermediates were studied. The degradation of SMX followed a pseudo-first order kinetics reaction with k obs at 0.1176 min -1 . Both SO 4 •− and •OH were responsible for the degradation of SMX, and SO 4 •− was the predominant free radical. XPS analysis demonstrated that reduced sulfide species promoted the conversion of Fe (III) to Fe (II), resulting in the higher transformation rate of SMX. Six intermediates products were generated through hydroxylation, dehydration condensation, nucleophilic reaction, and hydrolysis. The risk of intermediates products is subsequently assessed using E. coli as a model microorganism . After E.coli exposure to intermediates for 24 h, the upmetabolism of carbohydrate, nucleotide, citrate acid cycle and downmetabolism of glutathione , sphingolipid, galactose by metabolomics analysis identified that SMX was effectively detoxified by oxidation treatment . These findings not only clarified the superiority of S-nZVI/persulfate, but also generated a novel insight into the security of advanced oxidation processes .
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Hui Feng,Yuxin Li,Shaobo Zhang,Jiaxin Xu,Jieyu Xu,Hua Zou,Gang Pan
Developing highly selective adsorbents for antibiotic removal from aquatic environments is often hindered by the instability of molecular recognition sites in aqueous media. Traditional molecularly imprinted polymers (MIPs) frequently exhibit impaired performance in water due to the disruption of non-covalent interactions. This study presented a general strategy for the fabrication of “greenificated” MIPs utilizing a deep eutectic solvent (DES) as both a functional monomer and a structure-directing porogen in a one-pot synthesis. The resulting polymer, MIP-DES/(20% MeOH), targeted sulfamethoxazole (SMX) through a “solvent-reactant synergy” mechanism. Under optimized conditions, the adsorbent achieved a maximum capacity of 59.58 mg/g and an imprinting factor of 1.80. Mechanistic elucidation using density functional theory (DFT) and spectroscopic analysis confirmed that the recognition was governed by specific hydrogen bonding, π-π interactions, and hydrophobic effects, which remained stable despite interference from competitive analytes, 12 water matrices and natural organic matter. Comprehensive assessments including AGREEMIP, life cycle analysis, biological toxicity, and long-term desorption together confirmed environmental friendliness of both pristine and SMX-saturated adsorbent. This work demonstrates that DES-mediated imprinting provides a robust pathway for the sustainable production of high-performance materials capable of selective recognition in complex engineered and natural water systems.
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高影响因子
Water
·
2026
·Vol. 18
·期 11
·1334
·
IF 3.5
Taowei Qian,Longfei Wang
Microalgal biotransformation plays an important role in determining the environmental fate of trace antibiotics. However, the role of polystyrene microplastics (PS-MPs) in regulating algal stress responses and antibiotic biotransformation remains poorly understood. In this study, PS-MPs and sulfamethoxazole (SMX) were selected as representative pollutants to investigate the toxic effects, defense responses, and SMX degradation mechanism of typical microalgae, i.e.,Chlorella sorokiniana, under single- and combined exposure conditions (PS-MPs: 10 mg/L; SMX: 0.5 and 5 mg/L) over 8 days. The results showed that co-exposure significantly alleviated growth inhibition, photosynthesis inhibition, and reactive oxygen species (ROS) accumulation. Meanwhile, antioxidant enzyme activities decreased, whereas extracellular polymeric substance (EPS) secretion increased markedly, with the highest exopolysaccharide content reaching 83.22 ± 0.13 mg/L in the PS-MPs + 5 mg/L SMX group. Compared with the 5 mg/L SMX group, the biodegradation ratio and total removal ratio of SMX in the PS-MPs + 5 mg/L SMX group increased from 28.90% to 39.50% and from 40.90% to 50.50%, respectively. The relevant research proved that high EPS secretions facilitated SMX degradation and consequently reduced biotoxicity. Moreover, eleven degradation products and three potential transformation pathways were identified during the incubation. During the co-exposure of SMX and PS-MPs, most metabolites exhibited lower toxicity and bioaccumulation potential than SMX, indicating reduced ecological risk in the presence of PS-MPs. These findings provide new insight into the fate of antibiotics in microplastic-contaminated aquatic systems.
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高影响因子
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