Journal of Cleaner Production
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2024
·
IF 9.7
Jiashuai Hu,Jie Chen,Xiaoling Liu,Jie Liang,Ke Zhang,Bing Jiang,Hongbing Luo,Lin Li,Xiaochan An,Xiaobing Chen,Xiaojun Chen,Wei Chen,Wancen Xie,Yong Wang,Xiaohong Zhang
Hydrothermal carbonation carbon (HTCC) is increasingly acknowledged as a promising photocatalytic material for degrading antibiotics in water due to its green and cost-effective properties. While ethanol and water are prevalent solvents in the preparation of HTCC, research examining the influence of solvent combinations on the photocatalytic efficacy of HTCC is lacking. The influence of various ethanol-water co-solvent preparation ratios (0, 20, 40, 60, 80, and 100 wt% ethanol concentration in the co-solvent) on the photocatalytic degradation activity of trimethoprim (TMP) by HTCC was examined in this study. The results indicated that altering ethanol solvent preparation concentrations modulates the morphological characteristics, surface functional groups, and photochemical attributes of co-solvent HTCC materials. HTCC prepared using an 80 wt% ethanol solvent concentration demonstrated the most efficient TMP photocatalytic degradation (>90%). The TMP degradation kinetic constants of 80 wt% ethanol concentration co-solvent HTCC were 3.29 and 1.51 times greater compared to those of HTCC prepared using only water or ethanol as solvents, respectively. •O 2 − predominantly served as the key reactive oxygen species in TMP photocatalytic decomposition by 80 wt% ethanol concentration co-solvent HTCC, with its generation mechanism linked to the intrinsic furan donor-acceptor (D-A) conjugated structure of HTCC. An increase in ethanol solvent preparation concentration promotes the formation of more furan units, increased coupling of donor-acceptor (D-A) conjugation, a lower D-A ratio, and enhanced generation of short-chain aliphatics in HTCC, which then directly impacts its electron transfer capability, bandgap structure, light absorption capacity, and photocatalytic degradation efficiency. This work provides fresh strategies for the preparation and photocatalytic performance modulation of water treatment photocatalysts based on HTCC.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wen Lu,Aimin Wang,Yanyu Zhang,Songyu Ren,Zhongguo Zhang
In this work, an innovative strategy combining vacuum ultraviolet (VUV) and K doping graphite carbon nitride (K-g-C 3 N 4 ) was proposed for antibiotic removal in aqueous. The properties of K-g-C 3 N 4 were systematically characterized by XRD, FT-IR, BET, SEM, UV-vis DRS, and XPS, showing that K-g-C 3 N 4 possessed a larger specific surface and richer functional groups than g-C 3 N 4 . The catalytic efficiency of K-g-C 3 N 4 was investigated for the trimethoprim (TMP) removal under VUV irradiation. Compared with UVC photolysis, VUV photolysis, UVC/g-C 3 N 4 , VUV/g-C 3 N 4 , and UVC/K-g-C 3 N 4 processes, VUV/K-g-C 3 N 4 enhanced the pseudo-first-order reaction rate constant of TMP removal by 2.0–19.7 times and the mineralization rate by 9.0%-38.2%. Electron paramagnetic resonance results and quenching experiments validated that O 2 •- , • OH, 1 O 2 , h + , and e - were engaged in the VUV/K-g-C 3 N 4 process. The fluorescent spectra of O 2 •- -substituted and • OH-substituted products revealed that the K-g-C 3 N 4 greatly enhanced the quantity of O 2 •- and • OH during VUV irradiation. The VUV/K-g-C 3 N 4 system produced marginally more H 2 O 2 and • OH than the UVC/K-g-C 3 N 4 system, confirming that K-g-C 3 N 4 predominantly utilized the UVC and other ultraviolet–visible light emitted by the VUV lamp, with VUV having a minor effect. Furthermore, K-g-C 3 N 4 had exceptional stability and reusability, efficiently degrading various contaminants under VUV irradiation. This work offered a comprehensive insight into VUV/K-g-C 3 N 4 process as a novel approach for antibiotic removal from water.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 57
·120590-120604
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IF 5.8
Lu Wen,Ren Songyu,Zhang Yanyu,Wen Ximeng,Zhang Zhongguo,Wang Aimin
A comparative study on the mineralization of antibiotic trimethoprim (TMP) in neutral medium was investigated by applying irradiation with five types of ultraviolet lamps. Among these lamps, the whole envelope of one lamp contained ordinary quartz, which could only transmit ultraviolet-C (UVC) light. For the other four lamps, approximately one tenth, a quarter, a half, and full of envelopes were comprised of high-purity synthetic quartz, which can transmit both vacuum ultraviolet (VUV) and UVC light. TMP decay was well fitted to pseudo-first-order reaction kinetics and occurred more quickly as the VUV intensity increased. Poor mineralization was achieved in the absence of VUV light, whereas the mineralization efficiency was also enhanced with increasing VUV intensity. The presence of hydroxyl radicals ( • OH), superoxide radicals (O 2 •− ) and singlet oxygen ( 1 O 2 ) during VUV photolysis of water was confirmed by electron paramagnetic resonance (EPR) analysis. Appropriate radical quenching experiments and fluorescent molecular probe detection provided the evidence that • OH played a significant role in TMP mineralization. Higher VUV intensity favored the generation of H 2 O 2 and • OH. The evolution of NH 4 + and NO 3 − as well as carboxylic acids (formic, acetic, oxalic, and oxamic acids) released in the treated solution were quantified. Ten aromatic intermediates were also identified by UPLC-QTOF-MS. Thereby, a plausible reaction sequence for TMP mineralization in VUV/UVC photolysis was finally proposed. Graphical Abstract
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PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 12
·3333-3343
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IF 3.709
Yongjun Song,Aimin Wang,Songyu Ren,Yanyu Zhang,Zhenjun Wen,Zhongguo Zhang
BACKGROUND It would be highly advantageous to develop a heterogeneous electro-Fenton (HEF) system in which the catalyst is fixed to recycle easily and the electrode itself can produce and activate H 2 O 2 simultaneously. In this study, a new sandwich-like bifunctional cathode using carbon cloth (CC) loaded with FeOCl nanoparticles and activated carbon fiber (ACF) was fabricated and used in the HEF process for the degradation of antibiotic trimethoprim (TMP). RESULTS Experimental results showed that the activated carbon fiber and FeOCl-modified carbon cloth cathode (ACF/CC@FeOCl) exhibited a promising catalytic performance to reduce O 2 to generate H 2 O 2 on the surface of ACF and activate H 2 O 2 to generate hydroxyl radicals ( • OH) at the active sites of FeOCl nanoparticles, thus enabling a rapid TMP degradation in a wide pH range (3–9). Various influencing factors, such as applied cathodic current, pH and TMP concentration, were investigated, and the optimal condition was found at 0.36 A, pH 3.0, and 100 mg L −1 TMP, where 99.7% TMP was degraded within 90 min and 74.4% total organic carbon (TOC) was removed within 360 min. Under the condition of 0.36 A and initial pH 6.8, 100 mg L −1 TMP was completely degraded within 120 min and the mineralization efficiency could achieve 61.5% within 360 min. The coumarin fluorescence probing technique and radical quenching experiments revealed that • OH was the predominant reactive oxygen species (ROS) in the ACF/CC@FeOCl-HEF process. CONCLUSION The reusability and stability tests showed that the ACF/CC@FeOCl cathode has excellent performance and good stability, and this is very promising for the efficient degradation of refractory organic pollutants in the HEF process. © 2022 Society of Chemical Industry (SCI).
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Yili Ding,Yanzhi Ma,Charles Ding,Jiehua Nie,Zhe Xu
Through cyclodextrin selection from phase solubility study, complexation method screening, and complexation condition optimization by using single and orthogonal strategy, the complexes of trimethoprim with methyl β -cyclodextrin, HP β -cyclodextrin and HP- γ -cyclodextrin with the best solubility increasing so far were prepared and confirmed by FTIR, DSC and proton NMR spectra. The in vitro pharmacokinetic study showed that trimethoprim was 80 %–90 % released in three complexes in 20 min., and in their dog's in vivo pharmacokinetic study, the C max was increased from 0.22 µg/mL to 0.85 µg/mL, 0.7 µg/mL and 0.72 µg/mL, the AUC 0∼40 was increased from 2.35 µg*h/mL to 3.94 µg*h/mL, 5.06 µg*h/mL and 6.73 µg*h/mL, the LC was shorten from 2.17 L/kg/h to 0.89 L/kg/h, 0.56 L/kg/h and 1.07 L/kg/h for the complexes with methyl β -cyclodextrin, HP β -cyclodextrin and HP- γ -cyclodextrin respectively. After combination with sulfamethoxazole cyclodextrin complex, the antibacterial activity of the complex of trimethoprim with methyl β -cyclodextrin was increased significantly compared with the pure drug alone, indicated that this complex can be used as new potent antibacterial agent.
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高影响因子
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