MOLECULES
·
2023
·Vol. 28
·期 23
·7906
·
IF 4.6
Rong Li,Xing Lu,Jinxiang Gao,Yifan Chen,Shunlong Pan
Peroxyacetic acid (PAA)-based advanced oxidation processes (AOPs) have attracted much attention in wastewater treatment by reason of high selectivity, long half-life reactive oxygen species (ROS), and wider applicability. In this study, cobalt ferrite (CoFe2O4) was applied to activate PAA for the removal of ofloxacin (OFX). The degradation of OFX could reach 83.0% via the CoFe2O4/PAA system under neutral conditions. The low concentration of co-existing anions and organic matter displayed negligible influence on OFX removal. The contributions of hydroxyl radicals (·OH), organic radicals (R-O·), and other reactive species to OFX degradation in CoFe2O4/PAA were systematically evaluated. Organic radicals (especially CH3C(O)OO·) and singlet oxygen (1O2) were verified to be the main reactive species leading to OFX destruction. The Co(II)/Co(III) redox cycle occurring on the surface of CoFe2O4played a significant role in PAA activation. The catalytic performance of CoFe2O4remained above 80% after five cycles. Furthermore, the ecotoxicity of OFX was reduced after treatment with the CoFe2O4/PAA system. This study will facilitate further research and development of the CoFe2O4/PAA system as a new strategy for wastewater treatment.Keywords:peroxyacetic acid;cobalt ferrite;organic radicals;singlet oxygen;fluoroquinolone antibiotics
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Ruobing Yu,Zhicong Wu
In this study, by the application of the strong interaction between a metal-organic framework material and ofloxacin, ZIF-8 was proposed as an absorbent to remove ofloxacin from wastewater. The results demonstrated that ZIF-8 could remove 96.3 ± 1.1% of ofloxacin from the ofloxacin solution of 100 mg/L, and the maximum equilibrium adsorption capacity reached 194.1 ± 0.4 mg/g, which is superior to that of an adsorbent based on physical adsorption. The high specific surface area and strong interaction between ofloxacin and ZIF-8, including strong hydrogen bonding , complexation of unsaturated metals, and electrostatic interactions , contributed to the adsorption process . Moreover, the adsorption efficiency reached 80.2% after four adsorption cycles. The pseudo-second-order kinetics and Langmuir adsorption model can describe the adsorption of ofloxacin by ZIF-8. Therefore, ZIF-8 is a promising material for the treatment of wastewater containing ofloxacin.
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Analytical Methods
·
2020
·Vol. 12
·期 39
·4783-4788
·
IF 2.596
Caiyun Jiang,Ting Wu,Jiaxun Liu,Yuping Wang
A novel composite (AgNPs-MIPs) was prepared by combining nano-silver particles with an ofloxacin (OFL) imprinted thermo-sensitive hydrogel. The thermo-sensitive optical properties of the composite were studied and it was used as a Raman substrate for the detection of ofloxacin. The results have shown that the position and intensity of the plasmon resonance absorption peak of the AgNPs-MIPs can be reversibly changed with the change of temperature, and the intensity of the ofloxacin Raman signal increases with the increase of temperature. Because the hydrogel combined Raman enhancement of silver nanoparticles, the selectivity of molecularly imprinted materials and the intelligent response of thermo-sensitive hydrogels, it can realize rapid, in situ, trace and selective detection of ofloxacin. Moreover, the detection limit can reach 10−10 mol L−1.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Guowen Wang,Dong Wang,Xiaoli Dong,Xiufang Zhang,Hongchao Ma
Flat Na 2 S 2 O 8 @PVDF-g-PDMAEMA/PVDF inorganic–organic composite membrane was prepared by sequential use of atom transfer radical polymerization (ATRP), non-solvent induced phase inversion separation (NIPS) and post-dipping treatment. The membrane was tested in a membrane chemical reactor (MCR) system for concurrent advanced oxidation and ultrafiltration of ofloxacin (OFLX) under UV irradiation. Results indicated that the production of sulfate radicals (SO 4 − ) from persulfate can achieve 54% removal efficiency of OFLX, outperforming single advanced oxidation processes (AOPs) or ultrafiltration treatment. The best performance, was secondary to the combination of high redox potential of the SO 4 − , hydrophilicity of N,N-dimethylaminoethyl methacrylate (DMAEMA) and molecular cutoff of polyvinylidene fluoride (PVDF) ultrafiltration membrane. This study also identified factors related to successfully preparing composite membranes with concurrent positive charges and hydrophilicity. Characterization using XRD, FTIR and EDS showed that introducing PDMAEMA into the polymer mixture and post-dipping were both required to obtain a multifunctional membrane, which can electrostatically attract negative S 2 O 8 2− species. Judging from SEM results, the formation mechanisms of the composite membrane structure were derived from instantaneous liquid–liquid demixing.
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Haiping Li,Bo Zhang,Fanping Meng,Siyuan Shao,Yufan Xia,Yu Yao
The pollution of quinolone antibiotics in the marine environment has attracted widespread attention, especially for ofloxacin (OFL) and oxolinic acid (OXO) due to their frequent detection. However, few studies have been conducted to assess the behaviors and microbial community response to these antibiotics in marine sediments, particularly for potential antibiotic-resistant bacteria. In this work, the adsorption characteristics, natural attenuation characteristics, and variation of microbial communities of OFL and OXO in marine sediments were investigated. The adsorption process of antibiotics in sediments occurred on the surface and internal pores of organic matter, where OFL was more likely to be transferred from seawater to sediment compared with OXO. Besides, the adsorption of two antibiotics on sediment surfaces was attributed to physisorption (pore filling, electrostatic interaction) and chemisorption (hydrogen bonding). The natural attenuation of OFL and OXO in marine sediment followed second-order reaction kinetics with half-lives of 6.02 and 26.71 days, respectively, wherein biodegradation contributed the most to attenuation, followed by photolysis. Microbial community structure in marine sediments exposure to antibiotics varied by reducing abundance and diversity of microbial communities, as a whole displaying as an increase in the relative abundance of Firmicutes whereas a decrease of Proteobacteria . In detail, Escherichia-Shigella sp., Blautia sp., Bifidobacterium sp., and Bacillus sp. were those antibiotic-resistant bacteria with potential ability to degrade OFL, while Bacillus sp. may be resistant to OXO. Furthermore, functional predictions indicated that the microbial communities in sediment may resist the stress caused by OFL and OXO through cyano-amino acid metabolism, and ascorbate and aldarate metabolism, respectively. The research is key to understanding fate and bacterial resistance of antibiotics in marine sediments.
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THIN SOLID FILMS
·
2025
·
IF 2
Iram Hussain,Lisha Zhang,Zhizhen Ye,Jin-Ming Wu
In this work, a low-temperature method for creating nanostructured TiO 2 thin films with controlled morphologies for the photocatalytic degradation of the persistent antibiotic pollutant ofloxacin in water is presented. A Ti–H₂O₂ interaction was used to produce hydrogen titanate nanowires, which were subsequently converted into three different nanostructures: anatase nanowires by calcined at 450°C, porous nanorods and hierarchical nanoflowers by treating at 80°C for 72 hours with hot water and sulfuric acid, respectively. Controls over surface area, hydroxyl group contents, and crystal phase composition were made possible by these post-treatments. With a reaction rate constant of 0.72 h⁻¹ and a photocatalytic efficiency of 98% ofloxacin degradation in 4 hours under UV light, TiO 2 nanoflowers outperformed commercial benchmark P25 mixed phase TiO 2 nanoparticle films (0.64 h⁻¹) among the different nanostructures. The mixed anatase-rutile phase, high surface area of 49.1 m²/g, large pore volume of 0.15 mL/g, and numerous surface hydroxyl groups are responsible for the superior performance. These results show that morphology-engineered TiO 2 films can be used to treat water effectively through photocatalysis.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Xuechang Ren,Yujie Zhang,Linhai Yang,Zuoyan Chen
In this paper, cobalt-doped graphitic carbon nitride composite photocatalyst (CoCNx) was prepared by a simple high temperature calcination approach. The catalytic activation performance of the catalyst for PMS was measured with ofloxacin as the simulated pollutant under solar light irradiation, and the effects of the amount of catalyst, PMS concentration and the initial concentration of ofloxacin on the activation performance were investigated. The results showed that CoCNx showed the higher catalytic activity for ofloxacin, and the degradation rate of ofloxacin (50 mg/L) in the CoCN10/PMS system reached 83.4% after 1 h of sunlight exposure, which was 3.4 of that in the CN/PMS system. The free radical quenching experiment showed that sulfate radical (SO 4 •− ) was the main active species in the CoCN10/PMS system. Cobalt doped graphite carbon nitride exhibits great potential for application in the degradation of environmental pollutants.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2014
·
IF 3.163
Dandan Zhou,Bingfa Chen,Min Wu,Ni Liang,Di Zhang,Hao Li,Bo Pan
Intensive human activities in agricultural areas resulted in significant alteration of soil properties, which consequently change their interactions with various contaminants. This process needs to be incorporated in contaminant behavior prediction and their risk assessment. However, the relevant study is missing. This work was designed to examine the change of soil properties and ofloxacin (OFL) sorption after tillage. Soil samples were collected in Yuanyang, Mengzi, and Dianchi areas with different agricultural activities. Although the mineral compositions of soils from Yuanyang and Dianchi differed greatly, these compositions are similar after tillage, especially for paddy soils . Soil pH decreased generally after OFL sorption, suggesting that ion exchange of OFL with protons in soil organic matter (SOM) was important for OFL sorption. However, a positive relationship between SOM and OFL sorption was not observed. On the contrary, increased SOM decreased OFL sorption when soils from the same geological location were compared. Generally speaking, tillage activities or dense vegetations greatly decreased OFL sorption. The higher OFL sorption in B horizon than A horizon suggested limited leaching of OFL through soil columns. The summed sorption calculated based on the sorption of individual soil components and their percentages in soils was higher than the intact soil. This phenomenon may be understood from the interactions between soil components, such as the coating of SOM on mineral particles. This study emphasizes that soil should be treat as a dynamic environmental matrix when assessing antibiotic behaviors and risks, especially in the area with intense human activities.
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CHEMOSPHERE
·
2018
·
IF 4.427
Xiaofeng Wang,Yin Li,Ruiyang Li,Hongwei Yang,Beihai Zhou,Xiaomao Wang,Yuefeng Xie
Fluoroquinolones (FQs) are very ubiquitous in water environment in China. The commonly application of free available chlorine (FAC) during water treatment stimulated the focus on the transformation of FQs during chlorination. Among these FQs, norfloxacin (NOR) and ofloxacin (OFL) are the representatives of secondary amine FQs and tertiary amine FQs, respectively. To better understand the difference between secondary amine FQs and tertiary amine FQs during chlorination, reaction kinetics, products and mechanisms were determined. The maximum k app of NOR were four orders of magnitude higher than that of OFL. Moreover, eleven products of NOR and twelve products of OFL were obtained by LC−MS/MS analysis. For the two FQs, the common reactive sites were three nitrogen atoms , benzene ring, carboxyl group and double bond by chlorination. For OFL, the ether ring was also active in aqueous system. The formation mechanisms of these products were presented in this study. The main reaction pathways were electrophilic addition to nitrogen, nucleophilic substitution to benzene ring, halodecarboxylation of carboxyl group and hydrolysis of ether ring. Na 2 S 2 O 3 as a reducing agent had large effect on the chlorination of secondary amine FQ, but no effect on tertiary amine FQ. Be different to secondary amine FQ, the opening of quinolone ring happened in tertiary amine FQ after halodecarboxylation of carboxyl group.
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Pengfei Liu,Fuwei Yang,Xingyu Xu,Manqing Zheng,Ming Liao,Yuqing Chen,Zhengqiu Yuan,Rui Zhang,Jiayin Li
This study develops a hierarchical diatomite-supported NiCoFe-LDH (De@NiCoFe-LDH) for peroxymonosulfate (PMS) activation to degrade ofloxacin (OFL). The analysis of SEM, XRD, FTIR, XPS and BET were used to characterize the samples. The as-prepared De@NiCoFe-LDH possesses a high specific surface area and abundant active sites, which contribute to its superior catalytic performance. Under the conditions of 0.2 g/L catalyst, 0.3 mM PMS, 20 mg L −1 OFL, and pH 5.2, 99.7 % of OFL was removed within 40 min, markedly outperforming the unsupported LDH. The removal fitted with the pseudo-first-order reaction kinetics well with rate constant of 0.1470 min −1 . ESR and quenching studies indicate that the OFL degradation proceeds via a mixed radical (SO₄• − , •OH, O₂• − ) / non-radical ( 1 O₂) mechanism, primarily driven by 1 O₂. Mechanism investigation suggested that the redox cycles of Ni 2+ /Ni 3+ , Co 2+ /Co 3+ and Fe 2+ /Fe 3+ on the surface of De@NiCoFe-LDH were crucial for PMS activation. In addition, the ideal reusability and versatility of De@NiCoFe-LDH as well as low-toxicity of treated water endowed the De@NiCoFe-LDH/PMS system with a wide range of applications.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Zhangxu Chen,Fanli Meng,Qihong Cai,Minglian Fu,Danchen Zhu
To solve the problem of ofloxacin pollution in contaminated water, Fe3O4 and ZIF-8 were prepared by a solvothermal method and stirring at normal temperature, respectively. Furthermore, a series of magnetic ZIF-8/reduced graphene oxide (Fe3O4/ZIF-8/rGO) composite aerogels with different mass ratios were synthesized by reduction and freeze-drying methods. The products were characterized using a Fourier transform infrared spectrometer, an X-ray diffractometer, a field emission scanning electron microscope, and a thermogravimetric analyzer. Taking ofloxacin (OFL) as the target pollutant, an orthogonal test was carried out to explore the optimum conditions for removing ofloxacin with the composite aerogel: under the conditions of an illumination time of 8.0 h, a mass ratio of 10 : 15 : 20 for Fe3O4/ZIF-8/rGO, a composite aerogel dosage of 8 mg, and an initial concentration of ofloxacin of 50 mg L−1, the removal rate of ofloxacin reached 98.87%. After being recycled five times, the removal rate remained at 90.23%. The prepared Fe3O4/ZIF-8/rGO composite aerogel and the developed ofloxacin removal procedure could provide a reference for the treatment of quinolone antibiotics and PPCPs in polluted water. Moreover, they can be expected to alleviate the energy crisis and enhance the application of solar energy to deal with environmental remediation in the future.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yan Wu,Yue Zhou,Hongchen Long,Xiangyu Chen,Yuanyuan Jiang,Lei Zhang,Tao Le
The study investigates a bimetallic organic framework (Zn/Eu-MOF) based fluorescent probe for visual detection of ofloxacin (OFL) in pork, beef and fish. The developed sensing probe recognizes OFL through internal filtration and cation-π interaction between OFL and Zn/Eu-MOF, resulting in a distinct color change from orange-red to light green. The content of OFL can be determined through RGB analysis by a mobile-phone. The developed sensing probe offers several advantages such as broad linear range (0.1 ∼ 80 μM), rapid response time (30 s), low detection line (0.44 μM). The effectiveness of the sensing probe can last for five rounds with good recovery. Moreover, the application of the sensing probe on pork, beef and fish samples are reliable, with recoveries ranging from 93.4 to 112.1%, and the relative standard deviations (RSD) within 1.17% to 2.06%. These results suggest that the developed sensing probe could have significant potential for practical on-site test in food.
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