APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Zexiao Zheng,Irene M.C. Lo
Pharmaceuticals and personal care products (PPCPs) and Escherichia coli ( E. coli ) are ubiquitous in sewage posing adverse effects on both ecosystems and human health. Herein, we propose a multifunctional photoelectrochemical (PEC) system to simultaneously degrade PPCPs, disinfect E. coli , and produce H 2 . To this end, an optimized MoS 2 @BL-BiVO 4 photoanode with reduced bulk and surface charge recombination was synthesized, exhibiting a photocurrent density of 2.21 mA/cm 2 at 1.0 V vs. Ag/AgCl in actual sewage, 8.1 times that of P-BiVO 4 . The MoS 2 @BL-BiVO 4 photoanode achieved complete degradation of 2 ppm benzophenone-3 and inactivation of E. coli in sewage with 89.32 μmol H 2 evolution at 1.0 V vs. Ag/AgCl in 30 min. Chloride ions in the sewage played a critical role in the PEC system: they were activated to become chloride-based radicals ( Cl, ClO) for sewage treatment and worked as hole scavengers to increase H 2 evolution. Natural organic matters in the sewage played a dominant role in impeding the PEC reactions because they can quench the reactive species and were adsorbed onto the photoanode’s surface to block charge separation. The PEC system shows good efficiency when degrading various PPCPs, and excellent reusability and stability, giving it great practicality.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2022
·Vol. 57
·期 8
·5376-5387
·
IF 3.612
Hai Chi,Yujie Li,Guoqin Liu
Summary In this study, a new electrochemical strategy based on the fabrication of a molecularly imprinted sensor onto a MoS 2 -loaded peanut shell carbon complex with gold nanoparticles (AuNPs) and nitrogen-doped carbon dots (N-CDs) was proposed for the detection of benzo(a)pyrene (BaP). Molecularly imprinted polymer (MIP) films were prepared by cyclic voltammetry (CV) using 2-mercaptobenzimidazole (2-MBI) as a functional monomer in the presence of BaP. The surface morphologies, structural characteristics and electrochemical properties of the obtained MIP/AuNPs/N-CDs/PSBC/MoS 2 /GCE were investigated via scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), UV–Vis spectrometry, fluorescence spectrometry, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimised conditions, the detection range of the electrode towards BaP varied from 5 nM to 20 μM with a detection limit of 1.5 nM. The prepared electrochemical sensor also exhibited good stability, relevant reproducibility and high selectivity. The application of the sensor in the actual analysis of edible oil samples showed promising results, thereby being relevant as a biomimetic sensing platform for the detection of chemical hazards in food and environment.
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高影响因子
Water
·
2023
·Vol. 16
·期 1
·121
·
IF 3.4
Xiaoze Yin,Huaqin Yin,Renjie Wang,Jinnan Wang,Aimin Li
Novel Fenton-like catalyst HKUST-1(Cu)/MoS2-3-C with a non-equilibrium-state surface was constructed for selective degradation of phenolic contaminants. Electron-polarized distribution facilitated the formation of σ-Cu-ligand between electron-poor Cu centre and phenolic compounds, which not only enhanced radicals generation but also accelerated the Cu(I)/Cu(II) redox. Meanwhile, ≡Mo–OOSO3−complexes formed by the electron-rich Mo centre and peroxymonosulfate (PMS), could directly oxidize phenolic contaminants with the generation of SO4•−. The radical quenching experiments and EPR tests indicated that both SO4•−and•OH played a dominant role in the reaction. Additionally, O2could be reduced to O2•−by OVs and subsequently converted into1O2over the Mo centre. DFT calculation, FT-IR, and in situ Raman spectra analysis results demonstrated that phenolic compounds and PMS were respectively adsorbed by electron-poor Cu centre and electron-rich Mo centre, favouring the electrons transfer from phenolic contaminants to Mo centre for PMS activation. With synergistic effects of σ-Cu-ligand and ≡Mo–OOSO3−complexes, HKUST-1(Cu)/MoS2-3-C achieved a high degradation rate of phenolic contaminants and utilization efficiency of PMS.Keywords:fenton-like catalyst;non-equilibrium-state surface;σ-Cu-ligand;≡Mo–OOSO3−complex;phenolic contaminants degradation
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Feihu Mu,Qiong Cai,Hao Hu,Jian Wang,Yun Wang,Shijian Zhou,Yan Kong
To solve the problem of energy shortage and environmental pollution, the construction of properly designed photocatalysts is a promising method. Here, UiO-66-(COOH) 2 /ZnIn 2 S 4 Z-scheme photocatalyst decorated with MoS 2 nanosheets was designed and constructed as a novel 3D hierarchical structure via hydrothermal methods. In this particular 3D hierarchical structure, the UiO-66-(COOH) 2 nanoparticles are decorated in the interweaving petal nanosheets of ZnIn 2 S 4 microspheres, while the co-catalyst of MoS 2 is folded at the edge of these interweaving petals. The excellent heterojunctions with highly exposed catalytic active sites are correspondingly built, and the close interfacial interaction between UiO-66-(COOH) 2 , MoS 2 and ZnIn 2 S 4 create a stage for fast transfer of photogenerated electrons, which are both effective for the photocatalytic reaction process. Also, the Z-scheme charge-transfer process improves the oxidizability and reducibility between UiO-66-(COOH) 2 and ZnIn 2 S 4 . As a result, the optimized UiO-66-(COOH) 2 /MoS 2 /ZnIn 2 S 4 photocatalyst exhibits excellent photocatalytic hydrogen production (18.794 mmol h −1 g −1 ) and reduction of Cr(VI) (0.06850 min −1 ) under simulated solar light irradiation, which are 15.3 and 6.7 times higher than that of bare ZnIn 2 S 4 , respectively, and also the prominent stability and excellent recyclability are obtained. This study provides new insights into the research on the Z-scheme system containing MOF components for growing energy and environmental demands.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenming Zhang,Xinyan Zhao,Youwei Zhao,Jiaqing Zhang,Xiaoting Li,Lide Fang,Ling Li
Herein, we first propose a facile strategy to synthesize Co9S8 and MoS2 nanocrystals embedded in porous carbon nanoflake arrays supported on carbon nanofibers (Co9S8-MoS2/N-CNAs@CNFs) by the pyrolysis of Mo-doped Zn, Co zeolitic imidazolate framework grown on carbon nanofibers and subsequent sulfuration. The electrocatalyst shows high and stable electrocatalytic performance, with a half-wave potential of 0.82 V for oxygen reduction reaction and an overpotential at 10 mA cm–2 for oxygen evolution reaction (0.34 V) and hydrogen evolution reaction (0.163 V), which outperform the metal–organic framework-derived transition metal sulfide catalysts reported so far. Furthermore, the Co9S8-MoS2@N-CNAs@CNFs are employed as an air cathode in a liquid-state and all-solid-state zinc-air battery, presenting high power densities of 222 and 96 mW cm–2, respectively. Such excellent catalytic activities are mainly owing to the unique three-dimensional structure and chemical compositions, optimal electronic conductivity, adequate surface area, and the abundance of active sites. Thus, this work provides an important method for designing other metal–organic framework-derived three-dimensional structural sulfide quantum dot multifunctional electrocatalysts for wider application in highly efficient catalysis and energy storage.
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DOI
PubMed
高影响因子
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