JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2024
·Vol. 71
·期 2
·209-219
·
IF 1.6
Jing Nan,Hai-Qi Wang,Rong-Chao Xue,Li-Ping Yu
Sulfamethoxazole (SMX) has numerous adverse effects and is present in various water systems; thus, the development of a rapid and accurate analytical method to detect SMX in water systems is crucial for protecting the environment and human health. A sulfamethoxazole molecularly imprinted photonic polymer (MIPP-SMX) capable of facile naked-eye recognition of target molecules was synthesized using the dual-functional monomers acrylamide and methacrylic acid. The color of the MIPP-SMX changed from green to blue in water samples containing sulfamethoxazole (SMX) in the concentration range of 0.5–5.0 mM. Furthermore, a linear correlation existed between the detected Bragg diffraction peak shift Δλ and SMX concentrations in water ranging from 0.5 to 2.0 mM. The detection limit for SMX was 0.3 mM. A recovery rate of 91.9%–108.5% was achieved when the polymer sensor was used to detect SMX in river water samples, with a relative standard deviation of 4.9%–6.0%. The designed MIPP-SMX enabled rapid visual detection of SMX in water samples. The proposed method represents a significant advancement in the visual detection of SMX in environmental water samples.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Jian Gao,Jingyu Wu,Yuancai Chen
This study found that bio-Pd 0 nanoparticles could launch proton motive force (PMF)-mediated antibiotics efflux pump (AEP) to confer the detoxification capability on Citrobacter freundii , as evidenced by the highest sulfamethoxazole (SMX) specific degradation rate (81.7 μg L −1 mg −1 protein d −1 ) at high PMF (pH 6). The batch experiment and RT-qPCR results indicated that bio-Pd 0 activated the AcrB efflux pump through upregulating the AEP transcriptional regulation factor ramA (2.7–3.1 times), which benefited the intra/extracellular respiration and ATP production/utilization. Path analysis revealed that the prosperity of metabolic activity and extracellular electron output capacity enabled SMX biodegradation, mainly through the electron redistribution and energy optimization with the formate dehydrogenase/hydrogenase based Short-chain (FDH/Hase-S-chain). The upregulation of hypE (2.7–8.6 times) and atpD (1.9–2.3 times) genes encoding the Hase respiratory chain and the F-type ATP synthase, respectively, further supports this mechanism. These novel findings provided a new strategy to improve the biodegradation efficiency of antibiotics wastewater.
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PubMed
高影响因子
Water Cycle
·
2023
·
IF 0
Jiaolong Zhang,Shuting Gou,Zhe Yang,Chaolin Li,Wenhui Wang
The application of promising g-C 3 N 4 has been limited by poor photogenerated electron-hole separation and limited absorption for visible light. Sulfamethoxazole (SMX) is a typical antibiotic drug that is used worldwide and hard to be disposed through conventional wastewater treatment methods. Herein, S-scheme Fe 2 O 3 /g-C 3 N 4 heterojunction was successfully prepared via a facile one-step sintering method and applied to photodegrade SMX under visible light irradiation. The integration of Fe 2 O 3 and g-C 3 N 4 shows superior charge separation and light absorption ability. As a result, the removal efficiency of 11 wt% Fe 2 O 3 /g-C 3 N 4 reaches to 99.2% within 30 min, which is visibly higher than 59.5% of pure g-C 3 N 4 . ·O 2 − and ·OH are demonstrated to be the predominant active species for SMX photodegradation, and the possible degradation pathway is also proposed based on electronic band structure of Fe 2 O 3 /g-C 3 N 4 heterojunction. This study presents a facile construction of g-C 3 N 4 based S-scheme photocatalyst and offers an environmentally friendly approach to effectively remove organic pollutants using renewable solar energy.
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Chemical Engineering Journal Advances
·
2021
·
IF 0
Ting Zhou,Jiangkun Du,Zhijie Wang,Guangfeng Xiao,Liting Luo,Muhammad Faheem,Haibo Ling,Jianguo Bao
Contaminants destruction via advanced oxidation processes using catalyst and heat for peroxydisulfate (PDS) activation have been proven to be a feasible method in environmental remediation. Nevertheless, the synergistic activation of PDS by Mn-based catalysts and heat was barely reported in early investigations. In this study, we focused on a systematic investigation of PDS activation over manganese dioxide (MnO 2 ) under the assistance of heat for sulfamethoxazole (SMX) degradation. Effects of some key reaction parameters such as PDS concentration, MnO 2 dosage, initial pH and temperature were evaluated. The MnO 2 /heat/PDS synergistic system presented high performance on SMX degradation compared to the MnO 2 /PDS and heat/PDS systems. The degree of synergistic effect between MnO 2 and heat in the MnO 2 /heat/PDS system was calculated and it was 88.62%. Both SO 4 •− and • OH rather than 1 O 2 were detected to be responsible for SMX oxidation. Based on identified oxidation products by the liquid chromatography-quadrupole/time-of-flight mass spectrometry, the transformation pathways of SMX in MnO 2 /heat/PDS system followed mainly four major pathways (a) cleavage of S-N bond; (b) hydroxylation for benzene ring; and (c) dehydrogenation of the amino group. Moreover, MnO 2 could keep its excellent catalytic performance even after four consecutive oxidation cycles. Therefore, this paper advances the understanding of the synergy of MnO 2 with heat for enhanced PDS activation.
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Frontiers in Environmental Science
·
2023
·
IF 4.6
Gan Xinhong,Song Yang,Liu Guoqiang,Zhang Huijuan,Yang Jianhua
We hydrothermally synthesized a flower-shaped ZnO/ZnIn2S4(ZnO/ZIS) Z-scheme heterojunction, which could decompose antibiotics efficiently. Meanwhile, the photocatalysts degradation of sulfamethoxazole (SMX) as the representative pollutant by ZnO/ZIS were studied deeply. When irradiated by a xenon lamp (500 W), ZnO/ZIS (0.20 g/L) degraded SMX (2.5 mg/L) in 6.5 h with an efficiency of 74.9%. The O2− and h+ played key roles in the visible light-assisted decomposition of SMX by ZnO/ZIS, while the role of OH was supplementary. Additionally, we investigated the mechanism of the generation of active species environmentally persistent free radicals (PFRs) within the SMX degradation using ZnO/ZIS by performing computations and experimental analyses based on density functional theory. Besides, PFRs (predominantly oxygen-centered) generated during the visible light-assisted SMX degradation by ZnO/ZIS had a concentration of 1011 spin/mm3. The generation of PFRs involves two major events, i.e., chemical adsorption and electron transfer. To adsorb the precursor F9a on ZnO, the energy required was −2.03 eV, and the electrons were transferred to the ZnO/ZnIn2S4 heterojunction from the precursor F9a. The PFRs only had minor negative impacts on the SMX degradation through ZnO/ZIS.
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高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2016
·
IF 3.13
Zhenyang Yu,Guohua Sun,Yanjun Liu,Daqiang Yin,Jing Zhang
Trans-generational effects are increasingly used to indicate long-term influences of environmental pollutants. However, such studies can be complex and yield inconclusive results. In this study, the trans-generational effects of sulfamethoxazole (SMX) on Caenorhabditis elegans on lifespan, reproduction and population growth were tested for 7 consecutive generations, which included gestating generation (F0), embryo-exposed generation (F1), germline-exposed generation (F2), the first non-exposed generation (F3) and the three following generations (F4–F6). Results showed that lifespan was significantly affected by embryo exposure (F1) at 400 µm SMX with a value as low as 47% of the control. The reproduction (a total brood size as 49% of the control) and population growth (81% of the control) were significantly affected in germline exposure (F2). Lifespan and reproduction were severely inhibited in non-exposed generations, confirming the real trans-generational effects. Notably, initial reproduction and reproduction duration showed opposite generation-related changes, indicating their interplay in the overall brood size. The population growth rate was well correlated with median lethal time, brood size and initial reproduction, which indicated that the population would increase when the nematodes lived longer and reproduced more offspring within shorter duration.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 86
·期 3
·568-583
·
IF 2.43
Deng Yu,Wang Min,Yang Yunpeng,Li Xiaodong,Chen Wenqing,Ao Tianqi
Biochar has been reported as an excellent adsorbent for antibiotics, but the application faces the challenges of complicated separation. Here, MgFe 2 O 4 -magnetic biochars (MBCs) derived from corncob were synthesized at 300 °C to remove sulfamethoxazole (SMX) and tetracycline (TC) simultaneously. The characteristics of MBC300 had a high magnetic intensity. MBC300 had the maximum adsorption capacity of SMX with 50.75 mg/g and the high adsorption amount of TC with 120.36 mg/g respectively, which were 4.49 and 6.48 times those of BC300. MBC300 had the advantage of energy conservation compared with MBC450 and MBC600. The better fitting kinetics and isotherms indicated that the SMX and TC sorption onto MBC300 were governed by chemisorption. FTIR and XPS analyses confirmed that the SMX sorption onto MBC300 was dominated by polar interactions and π-π electron donor-acceptor interactions (π-π EDA). Furthermore, the TC sorption was involved in pore filling, π-π EDA, H-bonds, and surface complexation. MBC300 presented effective adsorption of SMX and TC over a wide range of pH. The competition between antibiotics and coexisting pollutants of dissolved organic matter (DOM), Ca 2+ , CO 3 2− , and PO 4 3− significantly inhibited the sorption. The results indicate that MBC300 is an effective and promising adsorbent to treat SMX and TC simultaneously. MgFe 2 O 4 -magnetic biochar prepared at low temperature (300 °C) had good magnetic intensity. MBC300 had the highest adsorption capacity of SMX. SMX sorption was dominated by polar interactions and π-π EDA. TC sorption was involved in pore filling, π-π EDA, H-bonds, and surface complexation.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Su Yan,Lingling Zhan,Xiaoqing Meng,Dianzhan Wang,Xiaomeng Wang,Guanyu Zheng,Junhe Lu,Lixiang Zhou
Ultraviolet (UV)/peroxydisulfate (PDS) system has been employed for degrading organic pollutants in water, but the insufficient production of reactive species in the system limits the mineralization of organic pollutants. This study evaluated for the first time the effectiveness of integrating iron hydroxysulfates, including schwertmannite (Sch) and jarosite (Jar), with UV/PDS system for sulfamethoxazole (SMX) degradation in water. The optimal conditions identified for 40 μM SMX degradation were PDS 2 mM, photocatalysts 1 g L -1 and pH 3 in both of Sch/UV/PDS and Jar/UV/PDS systems. A synergetic effect between UV/PDS and Sch/UV processes was found in Sch/UV/PDS system with synergistic factor of 1.15, which drastically enhanced the production of reactive species ( OH and SO 4 •- ) and consequently improved SMX degradation and TOC mineralization. Additionally, schwertmannite exhibited higher photocatalytic activity than jarosite in UV/PDS system for both SMX degradation and TOC mineralization. In Sch/UV/PDS system, ≡Fe(OH) 2+ on schwertmannite can be efficiently photolyzed to ≡Fe 2+ and OH under UV irradiation with O 2 – generation, in which the produced reactive species contributed to a relatively small fraction of SMX degradation. More importantly, the regeneration of ≡Fe 2+ accelerated PDS activation to SO 4 •- / OH, which was responsible for the degradation of most SMX. However, the photoreduction of ≡Fe 3+ to ≡Fe 2+ on jarosite by UV irradiation was insignificant, thus leading to the poor PDS activation to SO 4 •- / OH and a lower SMX degradation rate. The degradation pathways of SMX in Sch/UV/PDS system were further proposed based on the identified degradation intermediates of SMX. Besides, schwertmannite exhibited a good adaptability in wide pH (2–9) range, good stability, and recyclability for catalyzing SMX degradation in UV/PDS system. Therefore, integrating schwertmannite with UV/PDS system is an attractive method for efficiently removing organic pollutants in water.
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高影响因子
ACS ES&T Water
·
2022
·
IF 0
Qiu-Jin Xu,Ling-Dong Shi,He-Ping Zhao
As one of the most widely used antibiotics, sulfamethoxazole (SMX) is frequently detected in wastewater, imposing a high risk to human health. Current biological and chemical methods for SMX removal are generally lacking in efficiency or are cost-intensive. Here, we demonstrated highly efficient catalytic SMX removal by using a H2-based membrane palladium-film reactor (H2-MPfR), which delivered H2 directly to palladium (Pd0) nanoparticles through bubbleless hollow fibers. The SMX removal rate using this system could reach up to 4.25 mg/L per h, much higher than many other biological or chemical reduction processes. Low H2 partial pressure (e.g., 0.025 MPa under the experimental condition) was proved sufficient for high-rate SMX removal, while appropriate Pd dosage (e.g., 100 mg/dm2) and hydraulic retention time were favorable for maintaining the efficiency of SMX removal. Furthermore, high-performance liquid chromatography and quadrupole-time-of-flight mass spectrometry analyses revealed that the H2-MPfR may remove SMX by destroying the isoxazole ring, and the transformation products have a lower toxicity than SMX. Overall, this study sheds light on catalytic SMX degradation and is helpful in developing cost-effective strategies for removing antibiotics from wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jie Dong,Weihua Xu,Shaobo Liu,Youzi Gong,Ting Yang,Li Du,Qiang Chen,Xiaofei Tan,Yunguo Liu
The conversion of biomass wastes to highly efficient biochar-based catalysts has attracted more and more attention because it meets the environmental protection concept of waste recycling. In this work, a novel magnetic catalyst (CoFe 2 O 4 @BC) was developed by using alkaline lignin, the dominant by-products of papermaking industry, as feedstock for biochar. More importantly, PAA (CH 3 C(=O) OOH) was successfully activated by CoFe 2 O 4 @BC nanoparticles for sulfamethoxazole (SMX) elimination. The catalytic activity of CoFe 2 O 4 @BC on PAA activation was systematically studied. When PAA was 825 μM and CoFe 2 O 4 @BC was 100 mg/L, 10 mg/L SMX could be completely degraded. The cycle of Co 3+ /Co 2+ of CoFe 2 O 4 @BC prompted the generation of acetyl(per)oxyl groups (CH 3 C(O)O• and CH 3 C(O)OO•), which were believed to be the dominant reactive substances for SMX degradation. The degradation of SMX was promoted under near-neutral pH conditions, and was inhibited when humic acid and HCO 3 − were added, while the Cl − showed a negligible influence. According to the analysis of oxidation products, three main transformation pathways of SMX were illustrated. The remarkable stability and magnetic separability of CoFe 2 O 4 @BC make it have a wider application prospect in the treatment of various wastewater.
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高影响因子
Frontiers in Environmental Science
·
2023
·
IF 4.6
Zhang Meilin,Li Shaofeng,Sun Jian,Sun Jianping,Wang Lei,Zhao Rui
To reduce the hazard of sulfamethoxazole (SMX) to the water ecology, the removal mechanism of SMX in wastewater was revealed. This study evaluated the PVDF/DA modified membrane in the membrane bioreactor (MBR) toward the removal and degradation of SMX as a recalcitrant micropollutant. A strategy of dopamine for surface modification of polyvinylidene fluoride (PVDF) membrane was proposed, and PVDF/DA membrane was prepared. Subsequently, PVDF/DA was run in the MBR for 60 days, and the reactor could produce good removal ability for SMX after certain acclimation. When the SMX concentration increased from 0.5 to 2 mg/L, liquid chromatography was used for analysis, and the results showed that the average removal rate was above 85%. The removal effect of COD and NH4+-N and the degree of membrane fouling were also evaluated. By measuring the extracellular polymer (EPS) content, the results showed that after 30 days of operation, the protein and polysaccharide contents in the cake layer on the surface of the PVDF membrane were 1.35 times and 1.49 times that of PVDF/DA membrane, respectively, and the PVDF/DA membrane could alleviate membrane fouling, thereby improving the service life of the membrane and reducing its operating cost. Finally, degradation by-products are evaluated to achieve deeper insight into the degradation mechanisms in the MBR process.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xing Liu,He Wen,Jing Wang,Ziwen Dai,Yimeng Shi,Bahar Ozbey-Unal,Cigdem Balcik,Jiakuan Yang,Shushan Yuan
Catalytic ceramic membranes (CCM) featuring catalytic and separating functions, show huge potential in water treatment. Nevertheless, the inability of catalytic ceramic membrane with high catalytic performance to be produced by current fabrication method are the bottleneck preventing their applications. Herein, the high performance CoCuAl@SiC CCM were successfully prepared by coating Al gel interlayer, hydrothermal reaction and annealing in reductive atmosphere. Annealing in reductive atmosphere play key role in enhancing the catalytic property of CoCuAl@SiC CCM. 99.3 % sulfamethoxazole (10 mg·L −1 ) degraded by CoCuAl@SiC CCM annealing at 300 °C and 0.5 mM PMS in 1 min under a wide pH range of 3.5–11.0 and in the presence of anions. Quenching tests confirmed the dominant role of singlet oxygen ( 1 O 2 ) in SMX degradation. The abundant oxygen vacancies and redox cycles of Co 3+ /Co 2+ and Co 2+ /Co 0 on CoCuAl@SiC CCM are crucial for PMS activation. In addition, the SMX degradation pathways were found to comprise deamination, hydroxylation, and ring open according to the degradation intermediates of SMX. This study not only provides an approach for the preparation of catalytic membranes with excellent catalytic activity, but also sheds a novel insight into the indispensable role of oxygen vacancy.
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高影响因子
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