ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Banghao Du,Gongduan Fan,Shangwu Yang,Jing Luo,Jiaxin Wu,Kai-Qin Xu
In this study, humic acid (HA) enhanced 17β-estradiol (17β-E2) degradation by Er 3+ -CdS/MoS 2 (ECMS) was investigated under ultrasonic and light conditions. The degradation reaction rate of 17β-E2 was increased from (14.414 ± 0.315) × 10 −3 min −1 to (122.677 ± 1.729) × 10 −3 min −1 within 90 min sonophotocatalytic (SPC) reaction with the addition of HA. The results of quenching coupled with chemical probe experiments indicated that more reactive intermediates (RIs) including reactive oxygen species (ROSs) and triplet-excited states were generated in the HA-enhanced sonophotocatalytic system. The triplet-excited states of humic acid (3 HA*), hydroxyl radical (•OH), and superoxide radical (•O 2 − ) were the dominant RIs for 17β-E2 elimination. In addition, the energy- and electron-transfer process via coexisting HA also account for 12.86% and 29.24% contributions, respectively. The quantum yields of RIs in the SPC-ECMS-HA system followed the order of 3 HA* > H 2 O 2 > 1 O 2 > •O 2 − > •OH. Moreover, the spectral and fluorescence characteristics of HA were further analyzed during the sonophotocatalytic reaction process. The study expanded new insights into the comprehension of the effects of omnipresent coexisting HA and RIs formation for the removal of 17β-E2 during the sonophotocatalytic process.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2016
·
IF 4.556
Lingling Zhang,Huan Qi,Zhengxu Yan,Yu Gu,Weiqiang Sun,Abraham Amenay Zewde
The present study evaluated inactivation efficiency of a sonophotocatalytic process using ZnO nanofluids including ultrasonic parameters such as power density, frequency and time. The result showed that inactivation efficiency was increased by 20% when ultrasonic irradiation was combined with photocatalytic process in the presence of natural light. Comparison of inactivation efficiency in photocatalytic, ultrasonic and sonocatalytic processes using Escherichia coli as a model bacteria identified that inactivation efficiencies are shown in the following order: ultrasonic irradiation < sonocatalysis < photocatalysis < sonophotocatalysis. Furthermore, inactivation mechanism of sonophotocatalysis was proposed. Studies of reactive oxygen species (ROS) and zinc ions (Zn 2+ ) release evaluation revealed that ROS play a key role in bacterial inactivation rather than Zn 2+ . Permeability of outer membrane (OM) and inner membrane (IM) of E. coli bacterial cells were studied and exhibited that sonophotocatalysis increased the permeability of OM and IM significantly. The enhanced bacterial inactivation effect in sonophotocatalytic process contributed to acoustic cavitation, sonocatalysis of ZnO and sonoporation phenomenon.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 20
·5959
·
IF 3.623
Jing Zhang,Weijie Zhao,Jiaqi Pan,Ruimin Tang
The Polyacrylonitrile (PAN)/g-C3N4/CdS nanofiber sono-photocatalysts were successfully synthesized by an ordinary electrospining-chemical deposition method. The PAN/g-C3N4/CdS heterojunction nanofibers constructed with the CdS nanoparticles deposited on the PAN/g-C3N4nanofibers. The g-C3N4/CdS heterojunction increase of light absorption and the construction of heterojunction can depress recombination of charge carrier and PAN nanofibers improve the recyclability successfully. Finally, a highly effective photocatalytic activity was performed by degradation of Rhodamine B (RhB) in visible light irradiation. Furthermore, an ultrasonic method is introduced into the sono-photocatalytic system to enhance the degradation efficiency of RhB ascribed to the synergistic effect of ultrasound.Keywords:PAN/g-C3N4/CdS heterojunction;low power ultrasound;sono-photocatalytic activity;nanofibers
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Banghao Du,Gongduan Fan,Shangwu Yang,Zhuoyi Chen,Jing Luo,Weiwei Yu,Junyi Yu,Qi Wei,Yushan Lu
Reactive oxygen species (ROS) play a considerable role in the catalytic reaction for removing organic pollutants, however, the generation and transformation mechanism by catalyst with light and ultrasonic irradiation still requires intensive investigation. In this study, a novel Er 3+ -CdS/MoS 2 (ECMS) composite was synthesized, and the synergetic degradation effects for 17β-estradiol (17β-E2) during the sonophotocatalytic (SPC) process were investigated. The contribution of ROSs for eliminating 17β-E2 during the SPC process through quenching experiments was generally ranked in the following order: superoxide radical (•O 2 − ) ≈ hole (h + ) > hydroxyl radical (•OH) > H 2 O 2 > singlet oxygen ( 1 O 2 ). •OH plays a crucial role in 17β-E2 removal by ECMS under sonocatalysis and photocatalysis conditions. The transformation process among ROSs was further analyzed and elucidated in the light of the probe measurement results with positive or negative correlation among ROSs. Besides, we observed a phenomenon that the generated concentration of •O 2 − rises first and then falls during the SPC process, which might be attributed to the formation of 1 O 2 via the oxidation of h + or recombination with •OH. This work clarifies the underlying mechanisms of sonophotocatalytic generation and transformation of ROSs in depth.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Gongduan Fan,Shangwu Yang,Banghao Du,Jing Luo,Xin Lin,Xia Li
A novel FeVO 4 /BiVO 4 heterojunction photocatalyst was synthesized by hydrothermal method. The FeVO 4 /BiVO 4 nanostructures were characterized by XRD, SEM, XPS, UV–vis, and photoluminescence spectroscopy. The effects of catalyst dosage, contaminant concentration, initial hydrogen peroxide (H 2 O 2 ) concentration, and pH value on the degradation of levofloxacin were investigated and several repeated experiments were conducted to evaluate the stability and reproducibility. The optimized process parameters were used for mineralization experiments. Reactive oxygen species , degradation intermediates, and possible catalytic mechanisms were also investigated. The results showed that the sonophotocatalytic performance of the FeVO 4 /BiVO 4 heterojunction catalyst was better than that of sonocatalysis and photocatalysis . In addition, the Type II heterojunction formed by the material still had good stability in the degradation of levofloxacin after 5 cycles. The possible degradation pathway and mechanism of levofloxacin by sonophotocatalysis were put forward. This work develops new sono-photo hybrid process for potential application in the field of wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 31
·16439-16447
·
IF 14.511
Bin Fang,Zipeng Xing,Fan Du,Weifeng Kong,Zhenzi Li,Wei Zhou
Sono-photocatalysis is considered a promising strategy for water decontamination and hydrolysis, and it is crucial to improve the sensitivity of the catalyst to mechanical forces to obtain more energy. In a single photocatalyst, the hollow structure refracts sunlight many times to improve light utilization, but with a sono-photocatalyst, can the hollow structure refract sound waves to enhance the sound field energy? This paper reports formation of CdS with different structures by controlling the etching rate and wrapping with hollow defective CoNi-LDH (HD-CoNi-LDH) to form a bilayer porous hollow framework structure. Characterization confirmed that evolution of CdS from the solid gave the bilayer a hollow framework state and improved the degree of sound field energy absorption. It was further shown that the honeycomb-like porous structure of HD-CoNi-LDH enhanced sound field energy absorption, which then acted on CdS to enable piezoelectric photocatalysis. Specifically, strong sound field absorption by hollow CdS@HD-CoNi-LDH increased the hydrogen precipitation rate by 3.5 times and the degree of bisphenol A degradation by approximately 30% compared to solid CdS. This work provides a new perspective for sono-photocatalysis.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Gongduan Fan,Chenjian Cai,Shangwu Yang,Banghao Du,Jing Luo,Yongfu Chen,Xin Lin,Xia Li,Yingmu Wang
In this study, Bi 2 MoO 6 /FeVO 4 core–shell heterojunction was adopted as sonophotocatalyst to investigate its sonophotocatalytic degradation of ciprofloxacin (CIP) under ultrasonic and visible light. The properties of Bi 2 MoO 6 /FeVO 4 sonophotocatalyst were analyzed by XRD, FTIR, SEM, TEM, BET, DRS, XPS, PL and EIS. The effects of different operating parameters on the sonophotocatalytic degradation performance of CIP were investigated. Under the optimal operating conditions, a CIP degradation efficiency of 98.2 % and a mineralization rate of 68.9 % could be achieved after 60 min of reaction. Kinetic studies showed that the degradation process obeyed a pseudo-first-order reaction with a rate constant of k sonophotocatalytic > k photocatalytic > k sonocatalytic . Before and after the addition of H 2 O 2 , the sonophotocatalytic degradation of CIP reached high synergy values of 2.02 and 2.50, respectively. The synergistic effect of degradation can be attributed to the generation of OH, O 2 − and h + in the system. Contribution rate calculation displayed that OH and h + were the most significant reactive oxygen species. In addition, twenty degradation products were identified by HPLC-MS analysis, and the toxicity of the degradation products was further analyzed by ECOSAR. Ultimately, three potential degradation pathways for CIP were proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yi Han,Mengxin Guo,Hongcheng Gao,Changyong Zhang,Keping Lu,Dejin Wang,Hongyu Xia,Zheng Peng
Sonophotocatalysis (SPC) has been designed as an emerging treatment technology to degrade organic pollutants in wastewater. Reed and Red mud waste were utilized to synthesize a novel heterojunction catalyst (RSRM50-1100) through co-pyrolysis processes. Several characterization tests and density functional theory (DFT) calculations confirmed that the FeAl 2 O 4 /Fe 3 O 4 /BC heterojunction was present in RSRM50-1100, and the spontaneous electron transfer occurred from FeAl 2 O 4 to Fe 3 O 4 within the heterojunction. Meanwhile, RSRM50-1100 exhibited excellent degradation and photoelectric properties in SPC system. Furthermore, a series of free radical identification experiments confirmed that 1 O 2 was dominant in the SPC system of RSRM50-1100. The generation of 1 O 2 stemmed from the reaction of h + / · O 2 − and •OH/ · O 2 − , with the •OH/ · O 2 − reaction dominating. These findings not only showed that a novel photocatalyst RSRM50-1100 had an excellent performance for mitigating water pollution, but also proposed a promising strategy for disposing solid wastes.
研究领域:
环境科学
·
催化
·
材料科学
·
水污染控制
·
化学工程
✓ 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）