Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Han-Qing Zhao,Peili Lu,Fei Chen,Hongcheng Bai,Chen-Xuan Li,Guan-Nan Zhou,Jing Wang,Lilan Zhang,Yang Mu
Natural organic matters (NOMs), sulfide and organic pollutants such as antibiotics might all coexist in natural water environments. However, the impact of NOMs on aerobic organic pollutants transformation by sulfide is still poor understood. In this study, it observed that 50 ppm (14.55–23.05 mg C L −1 ) of various NOMs could facilitate the aerobic transformation of antibiotic ciprofloxacin (CIP) by sulfide, and the pseudo first order reaction rate k ranged from 3.24 × 10 −4 to 27.6 × 10 −4 min −1 for different sources of NOMs compared with 1.36 × 10 −4 min −1 for control one at pH 6.5. Moreover, sulfide oxidation process would play important roles for the aerobic CIP transformation, while transformation of other intermediate sulfur species did not directly promote CIP transformation. Electron paramagnetic resonance (EPR) and quenching experiments indicated that singlet oxygen ( 1 O 2 ) was the main active specie playing important roles in the process of aerobic CIP transformation with presence of sulfide and NOMs. Furthermore, carbonyl groups of the NOMs, especially the quinones , were demonstrated to play a critical role to promote the transformation of intermediate H 2 O 2 to 1 O 2 . This study provides a better understanding for the NOMs-mediated aerobic organic pollutants transformation by sulfide in aqueous environments.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 7
·3630-3639
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IF 3.591
Kaijia Li,Hongxiang Ou,Dongsheng Zhou,Chenxia Gong,Honglai Xue,Yuyan Li
Graphene oxide (GO) has the advantages of a high specific surface area and great mechanical properties, which make it useful in the field of adsorption; however, it is difficult to obtain and utilize nano-size GO for adsorption and separation. In this study, zinc ion crosslinked GO and sodium alginate aerogel microspheres (Zn–GO@SA) were prepared using the ion–gel method and used for ciprofloxacin (CIP) adsorption, and this was easy to separate and collect from solutions. Methods such as SEM, EDX, FT-IR, and TGA were used for physical and chemical characterization. The adsorption properties and mechanisms were examined via static and dynamic adsorption experiments. The results indicated that the Zn–GO@SA aerogel microspheres had abundant and ordered cavities. The adsorption isotherm and kinetic data fitting results showed that the adsorption process was consistent with the Freundlich model and a quasi-second-order kinetics model. The adsorption of CIP was a multi-layer adsorption process dominated by chemical adsorption. At 308 K, the maximum adsorption capacity was 134.85 mg g−1, while increasing the adsorption temperature had an adverse effect on CIP adsorption. The results of regeneration and dynamic adsorption experiments showed that Zn–GO@SA aerogel microspheres maintained good adsorption performance after repeated use, which means they have potential for practical applications.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 6
·1-14
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IF 2.132
Xiong Jinyan,Li Wei,Zhao Kai,Li Weijie,Cheng Gang
A simple and environment-friendly approach to prepare zinc oxide nanoaggregates was achieved by employing ethylene glycol–H 2 O as the reaction medium. The composition and structure of the as-fabricated ZnO products were confirmed using X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, and nitrogen adsorption measurements. By tailoring the volume ratio of ethylene glycol to water, coral-like, flower-like, and nanoparticulate ZnO nanoaggregates were successfully synthesized. The impact of the structure of the as-obtained ZnO nanoaggregates on the photocatalytic degradation of ciprofloxacin was further studied. Under simulated solar light irradiation, the photocatalytic removal rate of coral-like, flower-like, and nanoparticulate ZnO nanoaggregates for ciprofloxacin was 45%, 80%, and 90%, respectively. The reactive species trapping experiment result indicated that the generated holes, OH − , and ·O 2 − active species mainly contributed to the degradation of ciprofloxacin. On the basis of photoluminescence spectra and photo/electrochemical measurement results, the prevention of electron-hole recombination and the rapid charge transfer upon the ZnO nanoparticle aggregates resulted in their efficient photocatalytic activity.
Engineered zinc oxide nanoaggregates for photocatalytic removal of ciprofloxacin with structure dependence
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Catalysts
·
2019
·Vol. 9
·期 12
·1062
·
IF 3.444
Yue Wang,Xiaoxiao Zhu,Dongqing Feng,Anthony K. Hodge,Liujiang Hu,Jinhong Lü,Jianfa Li
The Fenton-type oxidation catalyzed by iron minerals is a cost-efficient and environment-friendly technology for the degradation of organic pollutants in water, but their catalytic activity needs to be enhanced. In this work, a novel biochar-supported composite containing both iron sulfide and iron oxide was prepared, and used for catalytic degradation of the antibiotic ciprofloxacin through Fenton-type reactions. Dispersion of FeS/Fe3O4nanoparticles was observed with scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). Formation of ferrous sulfide (FeS) and magnetite (Fe3O4) in the composite was validated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Ciprofloxacin (initial concentration = 20 mg/L) was completely degraded within 45 min in the system catalyzed by this biochar-supported magnetic composite at a dosage of 1.0 g/L. Hydroxyl radicals (·OH) were proved to be the major reactive species contributing to the degradation reaction. The biochar increased the production of ·OH, but decreased the consumption of H2O2, and helped transform Fe3+into Fe2+, according to the comparison studies using the unsupported FeS/Fe3O4as the catalyst. All the three biochars prepared by pyrolysis at different temperatures (400, 500 and 600 °C) were capable for enhancing the reactivity of the iron compound catalyst.Keywords:biochar;iron mineral;heterogeneous catalysts;antibiotic;advanced oxidation processes;water treatment;organic pollutants;Fenton reactions
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BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Chaofan Zheng,Huaili Zheng,Chao Hu,Yili Wang,Yongjuan Wang,Chun Zhao,Wei Ding,Qiang Sun
Magnetic biosorbents with specific morphological and molecular structure (PMCCs) were designed for the removal of ciprofloxacin (CIP) from water. Radical polymerization method was applied to immobilize the designed polymer brushes onto core-shell shaped magnetic microspheres to fabricate PMCCs. PMCCs exhibited a maximum adsorption capacity of 527.93 mg·g −1 , which is much higher than reported adsorbents, owing to the complete stretch of polymer brushes and increased active sites as well as enhanced interaction. The investigation on the adsorption behavior of PMCCs for CIP manifested that CIP adsorption well fitted the Langmuir isotherm model and pseudo-second-order kinetic model. The calculated thermodynamic parameters suggested that CIP adsorption onto PMCCs was spontaneous and exothermic. Further recycling experiments showed a loss of less than 20% in the CIP adsorption capacity after five times, demonstrating the reusability of the as-designed biosorbents.
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高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Yi Li,Suge Zhang,Yugui Han,Shanshan Cheng,Wenping Hu,Jingjing Han,Yanan Li
Ciprofloxacin (CIP) is a pervasive ecosystematic contaminant which is classified as highly effective broad-spectrum antibiotic. In this work, CIP was degraded by a self-prepared ternary Ce 3 ZrFe 4 O 14-x /CF composite cathode (x referred to oxygen vacancies) undergoing the heterogeneous electrocatalytic process. The influences of operating parameters such as pH, applied current and loading capacity, were estimated by removing efficiency. Compared with the pure carbon felt (CF), 3.8 wt% Ce 3 ZrFe 4 O 14-x /CF composite cathode showed the efficient degradation of CIP in broad pH range 3.0–6.0 with 100 mA. The degradation rates reached more than 98.0% at the wide pH range in 3 h, even reached 100% at pH = 3. The results indicated that the Ce 3 ZrFe 4 O 14-x /CF composite emerged a brilliant electrocatalysis in enhancing oxygen active species with converting reactions in Ce 4+ ↔Ce 3+ and Fe 3+ ↔Fe 2+ . For further understanding the ternary Ce 3 ZrFe 4 O 14-x /CF composite electrode, we used SEM, BET, TEM, XRD, XPS, TOC , HPLC–MS, EPR, CV and EIS to characterize and analyze. Also, it was deemed as a prospective cathode to accomplish industrialization for CIP degradation, based on lower energy consumption and wide pH range.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Lan-jia Pan,Jie Li,Chun-xing Li,Xiao-da Tang,Guang-wei Yu,Yin Wang
Ciprofloxacin (CIP) is an antibiotic drug frequently detected in manure compost and is difficult to decompose at high temperatures, resulting in a potential threat to the environment. Microbial degradation is an effective and environmentally friendly method to degrade CIP. In this study, a thermophilic bacterium that can degrade CIP was isolated from sludge sampled from an antibiotics pharmaceutical factory. This strain is closely related to Thermus thermophilus based on 16S rRNA gene sequence analysis and is designated C419. The optimal temperature and pH values for CIP degradation are 70 °C and 6.5, respectively, and an appropriate sodium acetate concentration promotes CIP degradation. Seven major biodegradation metabolites were identified by an ultra-performance liquid chromatography tandem mass spectrometry analysis. In addition, strain C419 degraded other fluoroquinolones, including ofloxacin, norfloxacin and enrofloxacin. The supernatant from the C419 culture grown in fluoroquinolone-containing media showed attenuated antibacterial activity. These results indicate that strain C419 might be a new auxiliary bacterial resource for the biodegradation of fluoroquinolone residue in thermal environments.
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CHINESE CHEMICAL LETTERS
·
2017
·
IF 1.932
Xu-Zhi Zhang,Meng-Shi Huang,Qian-Qian Yang,Dong-Sheng Ding,Jun Zhao,Wen-Rong Yang,Ke-Ming Qu
By employing an electrical micro-titration system, in which a capacitively coupled contactless conductivity detector (C 4 D) was used to monitor the reaction process in real time, herein a novel method for determining ciprofloxacin hydrochloride (CIPHCl) was developed for the first time. Mode 1: Standard CIPHCl solutions at different concentrations were loaded into reaction cells, respectively, and were titrated with standard Ag + . Upon the titration, the formation of a precipitate alters the number of ions in the solution, raising the change of conductivity, which was monitored by a special C 4 D to construct a titration curve. The endpoint of the titration was located from the peak of the curve. Between the elapsed time and the initial concentration of titrand, a linear relationship was established over the range of 2.0–8.0 mmol/L. Mode 2: Standard Fe 3+ took the place of Ag + , and was used as titrant to recognize ciprofloxacin contributed to the formation of complexation, which also resulting a change of solution conductivity. Under optimized conditions, a working range of 1.0–5.0 mmol/L CIPHCl was found. Because the reaction solutions were isolated from the working electrodes, this pioneer work shows significant simplicity and cost-effectiveness, by eliminating the requirements for detector exchange/renewal between different measurements, and by involving no auxiliary chemicals. Both of the two approaches were applied successfully to determine CIPHCl in tablet samples. And the results were in good agreement with those obtained by reference method.
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WATER ENVIRONMENT RESEARCH
·
2025
·Vol. 97
·期 2
·e70020
·
IF 1.9
Zonglin Li,Junsen Wang,Bomin Fu,Frederic C. Meunier,Mohamad Sleiman,Jean-Marc Chovelon,Hongtao Wang
The waste activated sludge (WAS) generated from sewage treatment accumulates antibiotics including ciprofloxacin (CIP), which may be released into the environments if WAS is not handled properly. Therefore, there is a need to develop technologies aiming at removing CIP from sludge. In this study, electrically activated peroxymonosulfate (E/PMS) was investigated to remove CIP from WAS. The optimal conditions for the degradation of CIP in sludge by E/PMS were determined by response surface methodology (RSM) simulations combined with experimental validation. The highest CIP removal level of 93.8% was achieved in 10 min at a dosage of 250 mg/g dry solid (DS) PMS, and an electrolysis voltage of 23 V. E/PMS facilitated the generation of radicals involved in the elimination of CIP. The contribution of free radicals showed that SO 4 •− is more important than HO • in this process. A degradation pathway for CIP in sludge was proposed based on the detected byproducts and density functional theory (DFT) calculations. The E/PMS process also promoted sludge disintegration, dewatering, heavy metal removal, and morphological transformation. The total content of all six heavy metals decreased, with As and Cr being converted into more stable forms, thereby reducing their leaching rates. The E/PMS process also reduced the toxicity of the sludge filtrate. Finally, the analysis of economic feasibility and energy consumption showed that E/PMS has a significant potential for controlling antibiotics and promoting the harmlessness of sludge. Practitioner Points Effective removal of ciprofloxacin (CIP) from waste activated sludge by electrically activated peroxymonosulfate (E/PMS). Reaction time has little effect on CIP removal from sludge. The degradation sites of CIP in sludge were the piperazine ring, the quinolone fraction, and the cyclopropyl. Promotion of sludge decomposition and dewatering, heavy metal stabilization, and decrease of sludge filtrate toxicity by the E/PMS process. Graphical Ciprofloxacin in sludge was degraded in a direct and indirect way by electrically activated peroxymonosulfate process, while sludge dewaterability was effectively improved.
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Aggregate
·
2025
·
IF 13.7
Yuge Wang,Lipei Ren,Yan Zhuang,Dongfang Liu,Zhixun Zhang,Lei Zhuo,Qian Zhang,Xiwei Guo,Xingfang Xiao,He Zhu
Photocatalysis is a renewable and eco-friendly process with great potential for the purification of ciprofloxacin (CIP) in water. However, conventional methods tend to focus on the design of photocatalysts, which pays less attention to the photothermal performance, resulting in a limited purification rate. Here, we propose a photothermal-photocatalytic textile based on carbon fiber felts decorated with homogeneous titanium dioxide films to efficiently purify CIP in water. The carbon fiber felts decorated with titanium dioxide films show high solar absorption (∼93 %) for solar water evaporation and simultaneous photocatalytic degradation for CIP purification. Notably, the enhancement of local wettability by titanium dioxide films on carbon fiber felts promotes photothermal efficiency. The carbon fiber felts decorated with titanium dioxide films demonstrate an evaporation rate of 1.19 kg m −2 h −1 , achieving an efficiency of 72.5 % under 1 sun. The experimental results reveal that the local thermal effect can effectively enhance catalytic degradation. CIP is almost completely degraded under sunlight, whereas the degradation efficiency under UV light is 55.8%. Specifically, we observe that CIP can be effectively degraded in purified water and condensed water. Moreover, the carbon fiber felts decorated with titanium dioxide films exhibit multidirectional degradation performance and stable physical and chemical properties, maintaining stable photothermal and photocatalytic performance even after prolonged sunlight exposure and repeated use. This work provides a paradigm for harnessing the abundant sunlight for antibiotic degradation.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Longjie Xiao,Hongkui Zhang,Xue Song,Yongde Liu,Jie Zhang,Feiyue Wang,Guihua Yan,Han Zhang,Tianzeng Jin,Jihong Zhao
This study investigated the competitive adsorption behavior and underlying mechanism of a potassium carbonate-activated sycamore flocculent biochar (KBC-SF) for the simultaneous removal of oxytetracycline hydrochloride (OTC-HCl) and ciprofloxacin (CIP) from aqueous environments. The structural and surface properties of KBC-SF were comprehensively characterized using SEM, FTIR, Raman spectroscopy, XPS, and N 2 adsorption–desorption analysis (BET). OTC-HCl and CIP concentrations quantified by validated UV–Vis spectrophotometry. The biochar exhibited a high specific surface area (1651 m 2 /g) and abundant oxygen-containing functional groups. In binary systems, maximum adsorption capacities at 45 °C reached 533 mg/g for OTC-HCl and 366 mg/g for CIP, which were substantially lower than those in single-solute systems, indicating significant competitive antagonism with OTC-HCl showing stronger affinity. The adsorption followed pseudo-second-order kinetics and was best described by the Freundlich isotherm, suggesting multilayer chemisorption. Thermodynamic parameters confirmed that the process was spontaneous and endothermic. Despite moderate interference from coexisting ions (e.g., Al 3+ , CO 3 2− ) and various real water matrices, KBC-SF maintained nearly complete removal efficiency. The adsorption process was dominated by π–π electron donor–acceptor (EDA) interactions, hydrogen bonding, and pore filling. These findings highlighted the excellent applicability and robustness of KBC-SF for removing coexisting antibiotics in complex aquatic environments.
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OZONE-SCIENCE & ENGINEERING
·
2018
·
IF 1.232
Shengtao Jiang,Jianzhong Zhu,Zibo Wang,Min Ge,Huayue Zhu,Ru Jiang,Enmin Zong,Yujiang Guan
The nanosized Fe3O4 catalyst was synthesized via a modified reverse coprecipitation method and characterized by means of a scanning electron microscope (SEM) and an X-ray diffraction (XRD) analysis instrument. The degradation efficiency and reaction rate of Fe3O4 in activating sodium persulfate used to degrade ciprofloxacin were determined from the catalyst dosage, oxidant concentration, and initial pH. The results showed that under the optimum conditions of a catalyst dosage of 2.0 g·L−1, a sodium persulfate concentration of 1.0 g·L−1, and an initial pH of 7, the degradation rate of ciprofloxacin was 93.73%, the removal rate of total organic carbon was 78%, and the first-order reaction constant was 0.06907 min−1 within 40 min. It was also demonstrated that the reactive oxygen species in the Fe3O4/sodium persulfate catalytic system were mainly composed of SO4– and supplemented by OH· and HO2· using probe compounds such as ethanol, tertiary butanol, and benzoquinone.
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