CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Caicheng Long,Sicong Liu,Xiao Li,Jing Zhu,Lei Zhang,Taiping Qing,Peng Zhang,Bo Feng
In view of the increasing threat of chlortetracycline (CTC) in water to human health and the ecological environment, how to detect and remove CTC in wastewater simply and effectively remains an important and challenging task. Herein, a multifunctional platform for the simultaneous detection and degradation of CTC is developed by in-situ synthesis of carbon dots (CDs) in the two-dimensional (2D) WS 2 interface by covalent bonding. The as-prepared 2D WS 2 /CDs nanocomposites can not only be used as an intelligent fluorescence probe for CTC detection with good sensitivity (LOD = 7.5 nM) and selectivity but also has good photodegradation ability for CTC (degradation efficiency attained 85.58%). Moreover, the possible mechanisms for the detection and photodegradation of CTC by 2D WS 2 /CDs were also investigated by theoretical calculations, time-resolved fluorescence decay curves, and electron spin resonance (ESR) analyses. The exceptional photoelectric properties of 2D WS 2 /CDs are ascribed to the CDs bound onto the 2D WS 2 interface by covalent bonding forming heterojunctions, which effectively promote strong interfacial interactions between CDs and 2D WS 2 , thereby providing more effective charge transfer and enhancing the detection efficiency and photocatalytic activity. In addition, the possible degradation pathway for CTC was speculated via identification of intermediates and frontier electron density calculation. Overall, this study not only proves that the 2D WS 2 /CDs nanocomposites have great potential for the simultaneous detection and degradation of CTC in aquatic environments but also provides a novel idea for the efficient and stable design of multifunctional nanomaterials for environmental pollution monitoring and purification, which is of great significance to both practical applications and basic research.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Jie Zhao,Qiang Song,Qiang He,Dionysios D. Dionysiou,Fei Wu,Yawei Feng,Xinying Zhang
The design of eco-friendly Bi 1.81 MnNbO 6.72 /sulfite system for efficient degradation of chlortetracycline was achieved. The feasibility of synthesizing Bi 1.81 MnNbO 6.72 by hydrothermal method was determined by X-ray diffraction. The magnetic test suggested that Bi 1.81 MnNbO 6.72 possessed paramagnetic properties, indicating unpaired electrons were present. Scanning electron microscope and transmission electron microscopy images revealed that Bi 1.81 MnNbO 6.72 octahedra exhibited exposed [1,1,1] crystal plane containing high density of Bi, Mn and Nb metal atoms. Large numbers of metal atoms will facilitate heterogeneous catalytic process. In a batch system with aeration, Bi 1.81 MnNbO 6.72 could be used as sulfite activator for the disposal of chlortetracycline. The reaction kinetics of the degradation process conformed to the pseudo-second-order kinetic model. In Bi 1.81 MnNbO 6.72 /sulfite process, initial pH, Bi 1.81 MnNbO 6.72 dosage, sulfite and chlortetracycline concentrations, as well as inorganic salt ions had great effect on chlortetracycline degradation. Under optimal conditions, the efficiency of Bi 1.81 MnNbO 6.72 /sulfite system for degradation of chlortetracycline could reach 76.2%. Moreover, Mn (II) plays a key role in the initiation of the catalytic reaction in Bi 1.81 MnNbO 6.72 /sulfite process. Generated SO 3 ●‒ could act as main reactive species in Bi 1.81 MnNbO 6.72 /sulfite process, while HO ● was also involved. Three new degradation products were detected by UHPLC/MS/MS and the possible degradation pathways in this system were proposed. Based on this, we believe that Bi 1.81 MnNbO 6.72 /sulfite is a type of process for degradation of organic contaminants with research significance and application prospects.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 33
·19401-19409
·
IF 3.119
Lu An,Pengfei Xiao
Tetracycline antibiotics are widely used in human and veterinary medicine; however, their gradual increase in the aquatic environment poses a serious threat to human health and ecosystems. The reactivity of peroxydisulfate (PDS) in the degradation of chlortetracycline (CTC) in aqueous solution using a zero-valent iron/activated carbon (AC) microelectrolysis method (Fe0–AC/PDS) was investigated by batch experiments. The results showed that the effects of different systems were as follows: Fe0–AC/PDS > Fe0/PDS > AC/PDS > Fe0–AC > AC > Fe0 > PDS. In the Fe0–AC/PDS system, the degradation efficiency of CTC could reach 88% under the following optimal experimental conditions: Fe0 dose of 0.4 g L−1, PDS dose of 2 g L−1, pH of 3 and initial CTC concentration of 50 mg L−1. The presence of Cl−, HCO3− and H2PO4− inhibited the degradation of CTC, while humic acid accelerated the degradation rate of CTC. The mineralization of CTC was evaluated from the TOC, with a value of 31.44% in 7 h. Free radical identification experiments showed that SO4−˙ and O2−˙ were involved in the degradation of CTC. The iron and carbon materials had good reusability, and the degradation rate of CTC was still approximately 70% after four cycles. Finally, the possible mechanism for the degradation of CTC by the Fe0–AC/PDS systems was discussed. Based on the above conclusions, Fe0–AC microelectrolysis is a new heterogeneous catalytic method for green and efficient activation of PDS and demonstrates potential applicability in the treatment of wastewater.
研究领域:
环境科学
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Zhang Sinan,Wang Jihong,Wang Shuhua,Leng Su
Contamination of chlortetracycline (CTC) in water is a global problem that needs to be addressed urgently. Biochar immobilization of microorganisms is an effective way to remove CTC contamination from sewage. In this study, the CTC removal effect of free bacteria LZ01 and erding medicine residues biochar immobilized LZ01 was compared by shake flask batch experiments. The results showed that immobilized LZ01 significantly improved the CTC removal rate by 15.27% compared to free LZ01. The immobilization of LZ01 also significantly improved the environmental tolerance and the reusability and storage stability of strain LZ01. The optimal conditions for CTC removal (83.83%) by immobilized LZ01 were determined by response surface methodology: temperature of 33.98 °C, pH of 7.84, initial CTC concentration of 73.75 mg/L, and inoculation dose of 0.51% (w/v). The experimental results of treating CTC from simulated sewage showed that the immobilized LZ01 could remove more than 64% of CTC from the sewage. The ion of Cu 2+ accelerated the removal of CTC by immobilized LZ01, and the removal rates could reach 81.07%, 85.07%, and 87.50% in three sewages, i.e., river sewage, pond water, and farming wastewater, respectively. This study provides a feasible, effective, and rapid biological removal technique for the treatment of CTC pollution in sewage.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Hongbo Chen,Yefeng Zhou,Xiayi Hu,Ke Tian,Junfeng Zhang
Due to the widespread use of antibiotics in healthcare and livestock production , antibiotic resistance genes and residual antimicrobials would enter environment and further discharge into the municipal sewage system. The objective of this work was to explore the potential effect of chlortetracycline (CTC) on biological nutrient removal from wastewater. Thus, the effects of CTC on biological phosphorus and nitrogen removal were investigated with respect to the viability of bacteria, the activities of key metabolic enzymes, and the transformations of intermediate metabolites. Results showed that the presence of 0.1 mg·L −1 CTC did not show any impact on biological phosphorus and nitrogen removal. Nevertheless, the long-term exposure to 1 and 10 mg·L −1 CTC decreased TN removal efficiency from 77.4% to 64.1% and 53.4%, respectively. Meanwhile, the presence of 10 mg·L −1 CTC decreased the SOP removal efficiency from 96.3% to 78.1%. Mechanism studies indicated that CTC could affect the activities of reductase and the transformations of polyhydroxyalkanoates and glycogen, resulting in inhibition of denitrification and phosphorus uptake, which may be the major reason for the high level of CTC showing adverse influence on wastewater biological nutrient removal.
研究领域:
环境科学
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微生物学
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污水处理
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产品关联
DOI
PubMed
高影响因子
Sustainability
·
2022
·Vol. 14
·期 10
·5892
·
IF 3.889
Zhifeng Liu,Xun Fang,Lingyuan Chen,Bo Tang,Fengmin Song,Wenbin Li
We used three purple soil (Hechuan, Jialing, and Cangxi) samples from the Jialing River basin as the research objects and added different proportions of an acid–base modifiedAlternanthera philoxeroidesbiochar (Cm) to the purple soil to study the effect of Cmon the adsorption of chlortetracycline (CTC) in the purple soil. The results indicated the following: (1) At 30 °C and pH = 6, the soil adsorption capacity increased with an increasing initial concentration of CTC. The maximum adsorption amount of CTC for each tested sample was in the range of 2054.63–3631.21 mg/kg, and the adsorption capacity in different Cmamended soils was ranked in the order of 10% Cm> 5% Cm> 2% Cm> CK. The adsorption capacity of CTC increased with an increase in the proportion of Cm. Furthermore, under the same addition ratio of Cm, Hechuan soil was found to have a better adsorption effect for CTC than Jialing and Cangxi soil. (2) The Langmuir model was the most suitable for fitting the adsorption behavior of CTC on different purple soils, and the fitting coefficients were all greater than 0.9, indicating that the adsorption of CTC on each soil sample occurred via monolayer adsorption. The thermodynamic experiment results showed that an increase in temperature was beneficial to the process of CTC adsorption, which was a spontaneous, endothermic, and entropy-adding process. (3) At pH = 6, the ionic strength ranged from 0.01 to 0.5 mol/L and the adsorption capacity of CTC of the soil samples decreased with an increase in ionic strength. In the range of pH 2–10, the adsorption capacity of CTC in all the soil samples decreased with an increase in pH. The inhibition capacity of CTC in the soil samples under acidic conditions was notably higher than that under alkaline conditions.Keywords:Alternanthera philoxeroides;biochar;modification;chlortetracycline;adsorption capacity;Jialing River
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
JOURNAL OF CONTAMINANT HYDROLOGY
·
2024
·
IF 3.5
Yuting Song,Hongyan Deng,Wenbin Li,Shuni Zhou,Xin Liu
To study the pollutants immobilization and economy of biologically amended coastal soil , Alternanthera philoxeroides biomass (Bm), biochar (Bc), and dodecyldimethyl betaine (BS) modified Bc (BS-Bc) were used to amend coastal soil from Jialing, Fu, and Qu River. A runoff experiment was used to simulate the longitudinal migration and morphological changes of Pb(II) and chlortetracycline (CTC) in each amended coastal soil, and the economy of pollutants immobilization by different amended coastal soil were compared. The equilibrium time of Pb(II) and CTC in each amended coastal soil ranked in the order of BS-Bc-amended > Bc-amended > Bm-amended > unamended coastal soil. The average Pb(II) and CTC flow rate in different amended coastal soils presented an opposite trend with the equilibrium time. Pb(II) and CTC content all reduced with the increasing runoff length. Under the same soils, the content changes presented Bm and Bc amended > unamended > BS-Bc amended. CEC and clay content of coastal soils were the key factors affecting Pb(II) and CTC immobilization. The immobilization mechanisms were electrostatic attraction, ion exchange, surface precipitation, and complexation to Pb(II) and ion exchange and complexation to CTC. The economy of Pb(II) and CTC immobilization ranged from 0.5 to 9.0 and from 1.0 to 5.4 mg/¥, and coastal soil amended by BS-Bc had practical application value and high economy.
研究领域:
环境科学
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生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 14
·13822-13831
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IF 2.76
Li Yuanzhu,Wang Haijiao,Liu Xiaoxia,Zhao Guangyu,Sun Ying
The dissipation of different residual states of tetracycline antibiotics (TCs) including oxytetracycline (OTC), tetracycline (TC), and chlortetracycline (CTC) laboratory microcosm systems was investigated in this study. The residues were fractionated by stepwise extractions into aqueous state (KCl solution extracts), organic state (MeOH extracts), residual state I (citric acid-sodium citrate buffer and ethyl acetate extracts) and residual state II (acetonitrile-EDTA-McIlvaine buffer extracts) for accurate evaluation of TCs pollution. The antibiotics in the aqueous state were hardly detected, whereas the antibiotics in the organic state dissipated relatively fast (not detectable within 15 days after application) and followed simple first-order kinetics (SFOK) ( R
2 from 0.929 to 0.990). While first-order double-exponential decay model (FODED) ( R
2 from 0.840 to 0.999) and availability-adjusted first-order model (AAFO) ( R
2 from 0.939 to 0.999) had a better fit on the dissipation of both residue state I and II than SFOK. TCs in these states were likely sequestered into a dormant undegradable phase since no degradation product was detected during the entire experiment. In addition, the overall 50 % dissipation values (i.e., stability) of the three TCs were OTC > TC > CTC. The TCs tend to dissipate faster in the high water content and organic matter soil.
研究领域:
环境科学
·
微生物学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiahao Cui,Xiaolong Gao,Bo He,Yong Yao,Yifan Zhao,Tiecheng Wang,Xianqiang Yin
The bimetallic oxides heterojunction structure from new 3D-ZIF was prepared to degrade the chlortetracycline by PDS activation. The system achieved more than 95 % degradation of chlortetracycline within 40 min. Theoretical calculations and physicochemical characterization of the NiZnCo-N-C proved that the material had better electron transfer properties and multi-site reactivity, and the presence of Zn provided an effective intermediate medium for the reaction of Co and Ni, while the non-metallic N-C component also constituted good electron reaction sites. Meanwhile, the existence of abundant oxygen vacancies established the good foundation for the formation of oxygen radicals in the material, and the rapid electron transfer processes speeded up non-radical processes such as electron transfer and 1 O 2 .The combination of two degradation pathways reduced the impact of environmental factors, the PDS + NiZnCo-N-C system exhibited relatively stable or even better performance in the existence of inorganic anions. Furthermore, the structure of the NiZnCo-N-C had the smallest d-band center, which efficiently adsorbed PDS molecules and broke the O-O bond in PDS. DFT Conclusion and LC-MS of CTC suggested the various reaction processes in the system. Our study provided new solutions and insights for the organic pollutions in the aquatic environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Si Duan,Yuan Gao,Guihong Lan,Haiyan Qiu,Bo Xu,Xiangming Liu,Ming Zhang,Yusong Chen
Functionalization of ligands is an effective strategy to enhance the adsorption performance of adsorbents. In this study, MIL-101(Fe)-R (R = -H, –OH, –NH 2 , and –NO 2 ) was selected as a platform for systematically studying the impact of functionalization on the adsorption behavior of chlortetracycline (CTC). A series of characterizations were conducted on the prepared MIL-101(Fe)-R to clarify the influence of organic linkers on the microscopic morphology, pore structure, and surface functionality of the adsorbents. Additionally, the effects of different functional groups on the adsorption behavior of MIL-101(Fe)-R were compared to screen for MOFs with high efficiency in removing CTC. Experimental results showed that the maximum adsorption capacities (q m ) of MIL-101(Fe), MIL-101(Fe)–NH 2 , MIL-101(Fe)–OH, and MIL-101(Fe)–NO 2 were 418.980 mg/g, 559.854 mg/g, 187.387 mg/g, and 154.131 mg/g, respectively. Among them, MIL-101(Fe)–NH 2 exhibited a higher mass transfer rate (reaching equilibrium in 15 min). Based on apparent adsorption behavior, adsorption kinetics, isotherm and thermodynamic studies, as well as FTIR and XPS characterizations before and after adsorption, the performance modulation mechanism of MIL-101(Fe)-R in CTC adsorption was discussed in detail. Combined with density functional theory (DFT) calculations, the host–guest interaction controlling the adsorption behavior was understood at the molecular level, demonstrating the optimal binding sites of the adsorbents. This study provides guidance for the design of efficient MOF adsorbents for antibiotic wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Rong Deng,Zhilan Wang,Jing Chen,Lianqin Zhu,Yaqin Shi,Wenli Xue
Ti 3 C 2 QDs with good water solubility and photoluminescence properties was prepared by nitrogen and phosphorus doping (N,P-Ti 3 C 2 QDs). The probe has a fluorescence emission peak at 420 nm and emits bright blue fluorescence, which can distinguish and detect two antibiotics with similar structures, chlortetracycline (CTC) and tetracycline (TC). The fluorescence enhancement effect can be realized by the interaction with CTC. The linear range is 2–22 μM, and the detection limit is as low as 0.53 μM. And the change of fluorescent color from bright blue to bright purple can be observed with the naked eye. At the same time, with the addition of TC, the fluorescence of N,P-Ti 3 C 2 QDs can be quenched by static quenching effect, and the fluorescence color changes from bright blue to yellowish green. The detection range is 4.1–20.5 μM, and the detection limit is as low as 0.16 μM.Therefore, on this basis, a strategy for simultaneous detection and recognition of CTC and TC is proposed. The method has been successfully applied to the determination of CTC and TC in milk samples. This paper provides a new detection method for the identification of tetracycline antibiotics and taps the application potential of Ti 3 C 2 QDs in food detection.
研究领域:
分析化学
·
食品安全
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Xiupeng Jiang,Youcai Zhao,Wenxiao Zhang,Qiyuan Zheng,Dong Li,Guofang Zhang,Tao Zhou
Anaerobic digestion (AD) is a highly efficient and promising method for treating waste activated sludge (WAS). Nevertheless, the presence of chlortetracycline (CTC) in WAS introduced uncertainty into the AD process. This study revealed that the cumulative methane yield was increased by 27.5 % with the CTC concentration at 50 mg/kg dry sludge by enhancing hydrolysis, acidification and methanogenesis during which specific microbial communities were enriched and related functional genes were enhanced. Subsequent investigations found the accumulation of extracellular polymeric substances (EPS) was improved and methane-producing microorganisms (e.g., Bacteroidetes and Euryarchaeota ) were also enriched under CTC exposure. Metagenomic analysis further elucidated that CTC significantly increased functional genes related to bacterial secretion system and metabolism of organic matter for methane production (e.g., pyruvate metabolism and methane metabolism). This study shed light on the substantial impact of CTC on the AD of WAS and provided a promising strategy for improvements in anaerobic fermentation.
研究领域:
环境科学
·
微生物学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）