JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 22
·19797-19808
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IF 2.22
Wang Peng,Xu Shiyu,Wang Jiayu,Liu Xuezheng
Photocatalysis technology has received much attention on the treatment of antibiotics residues. In this paper, CdS quantum dots (QDs)-decorated TiO 2 (CDS-T for short) have been prepared successfully through a photodeposition method and utilized as photocatalysts for degradation of metronidazole (MTZ). Under visible light irradiation for 60 min, the degradation ratio of MTZ over CDS-T-3 that was prepared by 3 h of photodeposition reached up to 90.9%, which was 1.5 times than that reached over commercial CdS. The decoration of CdS QDs onto TiO 2 can enlarge light absorption range to visible region. Furthermore, greatly improved separation efficiency of photogenerated carriers is realized through forming heterojunction. Activity control experiments demonstrate that O 2 · − serve as the main active species, while ·OH and holes (h + ) play secondary roles on the MTZ degradation. Moreover, electron spin resonance (ESR) technique, terephthalic acid photoluminescence (TA-PL) technique and N,N-diethyl-p-phenylenediamine (DPD) method confirm that larger amounts of active species are generated from CDS-T-3 than that from commercial CdS under visible light. This study can not only offer an easy method to prepare CdS quantum dots-decorated TiO 2 but also enlarge its application in solving the problem of metronidazole contamination.
研究领域:
环境科学
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材料科学
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高影响因子
Materials
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2022
·Vol. 15
·期 10
·3731
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IF 3.748
Dan Yuan,Shungang Wan,Rurong Liu,Mengmeng Wang,Lei Sun
A novel material of self-shaped ZnO-embedded biomass carbon foam pellets (ZnO@BCFPs) was successfully synthesized and used as fluidized particle electrodes in three-dimensional (3D) electro-peroxone systems for metronidazole degradation. Compared with 3D and 2D + O3systems, the energy consumption was greatly reduced and the removal efficiencies of metronidazole were improved in the 3D + O3system. The degradation rate constants increased from 0.0369 min−1and 0.0337 min−1to 0.0553 min−1, respectively. The removal efficiencies of metronidazole and total organic carbon reached 100% and 50.5% within 60 min under optimal conditions. It indicated that adding ZnO@BCFPs particle electrodes was beneficial to simultaneous adsorption and degradation of metronidazole due to improving mass transfer of metronidazole and forming numerous tiny electrolytic cells. In addition, the process of metronidazole degradation in 3D electro-peroxone systems involved hydroxyethyl cleavage, hydroxylation, nitro-reduction, N-denitrification and ring-opening. The active species of ·OH and ·O2−played an important role. Furthermore, the acute toxicity LD50and the bioconcentration factor of intermediate products decreased with the increasing reaction time.Keywords:electro-peroxone process;particle electrode;metronidazole;degradation mechanism;detoxification
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2017
·Vol. 26
·期 2
·765-777
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IF 1.877
Sun Lei,Chen Dongmei,Wan Shungang,Yu Zebin
Biochar derived from sugarcane bagasse was prepared at different pyrolysis temperatures and holding times for adsorption of dimetridazole and metronidazole from aqueous solution. The optimal pyrolysis temperature and holding time were 500 °C and 120 min, respectively. The removal efficiencies of dimetridazole and metronidazole were 98.0% and 88.8%, respectively, at biochar dosage of 4.0 g L −1 and solution temperature of 30 °C. Kinetics data were fitted by four kinetics models, and results indicated that adsorption was governed by pseudo-second-order kinetics. Adsorption is a multi-step process that involves film diffusion and pore filling. In addition, five isotherm models were employed to describe the adsorption equilibrium. Brunauer–Emmett–Teller model presented better fitting for the adsorption equilibrium, and the maximum adsorption capacities were 72.17 and 23.61 mg g − 1 for dimetridazole and metronidazole, respectively. The calculated values of ΔG 0 and ΔH 0 indicated the non-spontaneous and exothermic nature of the adsorption process at the range of temperature studied. Thermodynamic studies also revealed that physical and chemical adsorptions were co-action. The adsorption mechanisms of dimetridazole and metronidazole onto biochar were mainly hydrogen bonding and π–π interaction. All the results revealed that sugarcane bagasse biochar can be used as alternative to costly adsorbents for the removal of dimetridazole and metronidazole from aqueous solution.
研究领域:
环境科学
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化学工程
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高影响因子
Nanomedicine
·
2023
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IF 5.5
Meng Yan,Wen Liang,Lan Du,Rongjuan Guo,Yu Cao,Sheng Ni,Yuan Zhong,Kun Zhang,Kai Qu,Xian Qin,Liang Chen,Wei Wu
Aim: This study focused on treating periodontitis with bacterial infection and local over accumulation of reactive oxygen species. Materials & methods: Polydopamine nanoparticles (PDA NPs) were exploited as efficient carriers for encapsulated metronidazole (MNZ). The therapeutic efficacy and biocompatibility of PDA@MNZ NPs were investigated through both in vitro and in vivo studies. Results: The nanodrug PDA@MNZ NPs were successfully fabricated, with well-defined physicochemical characteristics. In vitro, the PDA@MNZ NPs effectively eliminated intracellular reactive oxygen species and inhibited the growth of Porphyromonas gingivalis. Moreover, the PDA@MNZ NPs exhibited synergistic therapy for periodontitisin in vivo. Conclusion: PDA@MNZ NPs were confirmed with exceptional antimicrobial and antioxidant functions, offering a promising avenue for synergistic therapy in periodontitis.Tweetable abstractClick to tweetA nanotherapeutic composed of dopamine nanoparticles loaded with metronidazole exhibited antimicrobial and antioxidative activities, presenting a safe and effective approach to periodontitis.
研究领域:
药剂学
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口腔医学
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纳米医学
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DOI
PubMed
高影响因子
RSC Advances
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2018
·Vol. 8
·期 70
·40022-40034
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IF 2.936
Wei Du,Qin Xu,Dangqin Jin,Xiaoyu Wang,Yun Shu,Liming Kong,Xiaoya Hu
This work investigated the feasibility and efficiency of a heterogeneous photo-Fenton catalyst, Fe/Si codoped TiO2, for the degradation of metronidazole (MNZ) under visible light irradiation. The Fe/Si codoped TiO2 was prepared via a facile and simple sol–gel solvothermal process followed by annealing at 480 °C for 4 hours. High resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) measurements revealed that the photo-Fenton process did not change the structure, textural and surface morphologies of this catalyst. Elemental mapping results indicated the good dispersion of Fe and Si ions in TiO2. Nitrogen adsorption and desorption measurements indicated that Si doping increased the surface area of the catalysts. The Fe and Si doping narrowed the band gap of TiO2. They also facilitated the transfer of photo-generated electrons from TiO2 to Fe(III). Under visible light irradiation and the optimum operating conditions, MNZ could be completely degraded in 50 min by this catalyst within a wide pH range. Hydroxyl radicals and holes were verified to be responsible for degrading MNZ. The leaching of iron ions was less than 0.047 ppm even after illuminating the catalyst for 6 hours, indicating the good stability of the Fe/Si codoped TiO2. The as-prepared catalysts with excellent catalytic activity, and remarkable reusability and stability could provide a new insight into the preparation of photocatalysts and have wide applications for antibiotics removal.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Meng Wu,Minghao Xu,Jiaojiao Yang,Yun Wang,Bin Lu,Hui Liu,Rufen Chen
The elimination of pharmaceutical wastewater has aroused great attention because of its environmental and ecological significance. In this work, an efficient photo-assisted FeP/peroxodisulfate (PDS) system was constructed and applied to the degradation of antibiotic. About 98.47 % Metronidazole (MNZ) could be removed by FeP/PDS after 20 min at its natural pH under the irradiation of 10 W fluorescent. The SO 4 •− , HO • and O 2 •− radicals were involved in MNZ degradation, in which SO 4 •− played the major role. Both Fe δ+ and P δ– in FeP as well as surface oxidized ≡Fe 2+ could be used as activity sites to activate PDS. The rate-determining step of Fenton-like reaction (M (n+1)+ → M n+ ) can be accelerated through internal electron transfer of FeP. Moreover, the Fe 2 O 3 /FeP hetero-structure on the surface of FeP particles also took part in PDS activation under light irradiation. This finding illustrates a potential utilization of metal phosphide as a photo-assisted Fenton-like catalyst to remove organic pollutants in the environment.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 415
·期 18
·4221-4232
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IF 4.478
He Ziguo,Liu Jiaxu,Zhang Cheng,Sun Yudie,Chen Qian,Zhang Jian,Liu Shengjun,Yue Caibo,Ye Mingfu,Zhang Kui
Humic acid–based carbon dots (HACDs) have excellent properties and are widely used in environmental detection, bioimaging, and optoelectronic materials. Herein, we investigated the structure–activity relationship between the morphology and optical properties of HACDs, and reported on a novel strategy for metronidazole (MNZ) and ornidazole (ONZ) sensing in multiple real samples. It was found that the average particle size decreased from 3.28 to 2.44 nm, optimal emission wavelength was blue-shifted from 500 to 440 nm, and the quantum yield (QY) improved from 5 to 23% with the temperature increasing from 110 to 400 °C. Under the oxidation of hydrogen peroxide (H 2 O 2 ) and potassium permanganate (KMnO 4 ), the UV–vis spectra of HACD aqueous solution showed time-dependent behavior, and the fluorescence emission of HACDs achieved spectrally tunable multi-color luminescence in the temporal dimension. The surface of HACDs contained a large number of hydroxyl (–OH) and carboxyl (–COOH) fluorophores, resulting in excellent pH sensing. Meanwhile, the synthesized HACDs revealed sensitive response to MNZ and ONZ with the limit of detection (LOD) of 60 nM and 50 nM in aqueous solutions, which had also been successfully applied in various actual samples such as lake water, honey, eggs, and milk with satisfactory results because of the inner filter effect (IFE). Our research is advantageous to enhance the potential applications of HACDs in advanced analytical systems. Graphical abstract
研究领域:
分析化学
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环境科学
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生物医学工程
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Wanlin Gan,Zhiwei Yang,Yuhan Zhang,Yu Guo,Jing Zhang
In response to the current demand for the development of efficient and stable photocatalysts for sulfite (S(IV)) activation, this study introduces C 3 N 5 to activate S(IV) under visible-light (VL) irradiation and elucidates the mechanism of the VL/C 3 N 5 /S(IV) system to degrade organic pollutants. The k obs value for the removal of metronidazole in the VL/C 3 N 5 /S(IV) system reached 0.07245 min −1 in 12 min. Subsequently, the activation mechanism of S(IV) and the generation of reactive species were studied. The results indicate that the excellent degradation performance of the VL/C 3 N 5 /S(IV) system is due to the generation of carriers in C 3 N 5 under visible light. The S(IV) reacts with photogenerated holes, producing •SO 4 - and •OH in a chain reaction. This study not only broadens the application scope of C 3 N 5 as a photocatalyst but also presents a novel S(IV) activation strategy, enriching the understanding of S(IV) activation mechanisms.
研究领域:
环境化学
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光催化
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污染物降解
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材料科学
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水处理技术
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DOI
高影响因子
CHEMOSPHERE
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2019
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IF 5.108
Shisheng Zhang,Tao Lin,Wei Chen,Hang Xu,Hui Tao
The residues of pharmaceuticals and personal care products (PPCPs) in environmental waters have been widespread concerned. Metronidazole (MNZ), normally employed to treat inflammation and infection, was chosen as one model PPCP. The degradation of MNZ by chlorination could be fitted by pseudo-first-order kinetics as the observed pseudo-first-order rate constants increasing from 0.0302 min −1 to 0.2872 min −1 . However, the kinetics during chloramination of MNZ followed pseudo-second-order reaction, whose estimated half-live was approximately 6–8 times longer than chlorination. The chlor(am)ination of MNZ especially formed chloroform (CF), dicholoacetamide (DCAcAm), tricholoacetamide (TCAcAm) and dichloroacetonitrile (DCAN), and their yields were overall lower under chloramination than chlorination. During chlorination, the yield of CF was increased from 0.35 ± 0.02% to 2.06 ± 0.12% with 1–20 chlorine/MNZ molar ratio, whereas the formations of DCAcAm, TCAcAm and DCAN increased firstly and then decreased. Increasing chloramine dosage promoted the concentrations of scheduled disinfection byproducts (DBPs). CF and TCAcAm kept continuous generation in chlor(am)ination versus reaction time. Compared with the chlorination, the chloramination of MNZ was more dependent on pH value due to the self-degradation of chloramine. Faintly acidic condition favored N-DBPs' formation in MNZ when it was subjected to chlor(am)ination. The chloramination of MNZ produced cytotoxicity and genotoxicity by 10–15 folds lower than chlorination, and DCAN formed during chloramination dominated both DBPs' yields and toxicity contribution. Opposite to chlorination, the integrated toxicity of MNZ during chloramination varied linearly versus N-DBPs' yields.
研究领域:
环境科学
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毒理学
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2017
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IF 2.084
Xiangyu Wang,Shan Cong,Jun Ma
To enhance the activity and dispersibility of nano zero-valent iron particles (NZVI), PVDF·Al 2 O 3 film is innovatively modified by an environmentally friendly reagent, polydopamine (PDA), via one-step grafting with an in situ simultaneous self-polymerization of PDA onto PVDF·Al 2 O 3 film surface before immobilization of NZVI in the PVDF·Al 2 O 3 film. The resultant PDA/PVDF·Al 2 O 3 –NZVI (PPAN) hybrid exhibits high activity and reusability for metronidazole (MNZ) removal. Investigation on mechanical strength of PDA/PVDF·Al 2 O 3 film indicates that the tensile strengh and modulus of elasticity of the film are significantly improved. Compared with unimmobilized NZVI, the removal efficiency of MNZ by PPAN-2 hybrid synthesized under optimized conditions is increased by 40.2%. Such excellent performance can be attributed to –OH and/or –NH groups in PDA polymer structure that facilitate the interaction and coordination between the precursor of NZVI and functional groups coating on PVDF·Al 2 O 3 film, resulting in the enhanced loading amount, dispersion, and activity of NZVI on PPAN-2 hybrid. Kinetics of MNZ removal by PPAN-2 are found to follow a two-parameter pseudo-first-order model. The presence of humic acid (HA) slightly inhibits the activity of PPAN-2 for MNZ removal. This research suggests that PPAN hybrid may be a promising functional composite for antibiotic wastewater treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Xiangyu Wang,Peng Liu,Jun Ma,Huiling Liu
For the first time, hydrophilized and functionalized polyacrylonitrile (PAN) membrane was synthesized via two-stage process, addition of polyvinyl alcohol and in situ polymerization of acrylic acid (AA), and nano zero-valent iron (NZVI) was incorporated within modified membrane. The as-prepared PAA/PAN-NZVI (PPN) composites possessed superior reactivity for metronidazole (MNZ) with transformation ratio 2.03 and reaction rate 4.77 times higher than that by bare NZVI. Meanwhile, the enhanced stability and recyclability of PPN composites were maintained over repeated cycles. The major advantages of synthetic method lie in the remarkably increased loading and decreased agglomeration of NZVI. Moreover, with hydrophilized and functionalized synthesis processes of membrane, the potential risk of released iron ions was not a concern due to strong chelation of grafted carboxyl groups. Analyses of morphological characteristics (FE-SEM), chemical structure (FTIR), element valence and groups (XPS) of samples confirmed the successful graft of carboxylic acid groups and formation of a uniform iron nanoparticles coating onto PAN matrix. The reaction kinetics of MNZ with PPN composites were well-described by a two-parameter pseudo-first-order decay model with activation energy of 29.5 kJ/mol. The co-solutes except humic acid had a negligible effect on MNZ transformation. Determination of intermediates revealed that nitro reduction, N-denitration and hydroxyethyl cleavage were the main pathways for transformation of MNZ. The findings suggest that the novel composites possess huge potential for antibiotics wastewater treatment.
研究领域:
环境科学
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材料科学
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高影响因子
Advanced Sensor Research
·
2024
·Vol. 3
·期 5
·2300185
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IF 0
Jialuo Zhuang,Zijian Li,Hong Bi
The development of fluorescent probe with high spectral overlap with analyte is favorable for the sensing applications via inner filter effect, which requires facile tuning of their structure and photophysical properties. Herein, the rational design of blue emissive carbon dots (B-CDs) is reported for effective detection of metronidazole (MNZ) in both deionized water and real water samples. The design strategy is based on the elaborate choice of precursors that allows precise control over the nitrogen-doping degree and graphitization content of B-CDs. As a result, the as-prepared B-CDs exhibit a specific and quick fluorescence quenching response to MNZ via the IFE mechanism because of their good spectral overlap in absorbance. This approach shows a broad linear range (0.5–160 µ m ), low detection limit (0.1 µ m ), and moderate selectivity, suggesting its promise for practical applications in environmental sensing.
研究领域:
分析化学
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环境科学
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材料科学
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DOI
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