SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Qi Wang,Ningyi Li,Meng Tan,Man Deng,Guoxiang Yang,Qiang Li,Hao Du
Photocatalysis is an emerging technique for the remediation of refractory organic contaminants. Herein, a novel dual Z-scheme Bi/BiOI-Bi 2 O 3 -C 3 N 4 heterojunctions were constructed through a calcining process following with I − etching and UV-reduction processes. Various analytical technologies were adopted to characterize the materials. As a result, the Bi 0 decorated composite presented improved visible-light-response and rapid charge transfer. Due to the synergy of Bi 0 and dual Z-scheme heterostructures, a remarkable photocatalytic performance toward phenol degradation was achieved with the highest degradation efficiency of 93.2% and rate constant of 0.0161 min −1 over the optimal composite within 75 min of visible light irradiation. Interestingly, the concentration of the yielded benzoquinone considerably decreased with the introduction of C 3 N 4 . Trapping experiments and electron spin resonance (ESR) tests indicated that h + , O 2 − , OH and e − contributed to phenol remediation, and h + and O 2 − were the crucial species toward phenol degradation. Furthermore, outstanding stability was obtained only with a decline of 3.8% after 4 cycles. A reasonable charge transfer mechanism was also proposed. This work provides a new route for in situ construction of Bi 0 decorated dual Z-scheme heterojunction for phenolic compounds degradation.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Qi Wang,Xiaodong Shi,Enqin Liu,John C. Crittenden,Xiangjuan Ma,Yi Zhang,Yanqing Cong
AgI sensitized BiOI-Bi 2 O 3 composite (AgI/BiOI-Bi 2 O 3 ) with multi-heterojunctions was prepared using simple etching-deposition process. Different characterization techniques were performed to investigate the structural, optical and electrical properties of the as-prepared photocatalysts. It was found that the ternary AgI/BiOI-Bi 2 O 3 composite exhibited: (1) improved photocurrent response, (2) smaller band gap, (3) greatly reduced charge transfer resistance and (4) negative shift of flat band potential, which finally led to easier generation and more efficient separation of photo-generated electron-hole pairs at the hetero-interfaces. Thus, for the reduction of Cr(VI), AgI/BiOI-Bi 2 O 3 exhibited excellent photocatalytic activity under visible light irradiation at near neutral pH. AgI/BiOI-Bi 2 O 3 was optimized when the initial molar ratio of KI to Bi 2 O 3 and AgNO 3 to Bi 2 O 3 was 1:1 and 10%, respectively. The estimated k Cr(VI) on optimized AgI/BiOI-Bi 2 O 3 was about 16 times that on pure Bi 2 O 3 . Good stability was also observed in cyclic runs, indicating that the current multi-heterostructured photocatalyst is highly desirable for the remediation of Cr(VI)-containing wastewater.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
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2025
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IF 6.1
Meixin Li,Zongbo Song,Shanshan Li,Mati Ullah Khan,Yongzhi Wang,Yunsi Xu,Shun Wang,Ling Kong,Zhiwei Chen,Feng Sang
Patulin (PAT), a potent mycotoxin commonly found in fruit and vegetable products, represents a critical threat to food safety and public health. Its cytotoxicity arises from the disruption of intracellular signaling pathways and oxidative balance, leading to gastrointestinal impairment, immune suppression, and systemic toxicity. To mitigate these risks, we present a label-free photoelectrochemical (PEC) aptasensor for ultrasensitive PAT detection, employing an in situ-synthesized Ag 2 S quantum dot (QD)-sensitized BiOI/Bi 2 O 3 heterojunction. The BiOI/Bi 2 O 3 heterostructure enhanced charge carrier separation, while the in situ-anchored Ag 2 S QDs functioned as effective photosensitizers, significantly amplifying the PEC response. Integrated with a PAT-specific aptamer, the sensor demonstrated selective target recognition, achieving a linear detection range from 0.001 to 100 ng/mL and a remarkably low detection limit of 0.56 pg/mL. The aptasensor exhibited high selectivity against structurally similar mycotoxins, excellent stability (94.2% signal retention through 15 on/off light irradiation cycles). Successful PAT quantification in spiked apple juice samples confirmed its practicality for real-world applications. This study establishes a sensitive, cost-effective, and reliable analytical tool for monitoring mycotoxins in food safety protocols.
研究领域:
食品安全
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分析化学
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纳米技术
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生物传感器
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毒理学
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光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Tongtong Zhang,Yuqi Wang,Xin Xie,Yanning Shao,Yuhao Zeng,Siyu Zhang,Qishe Yan,Zhongjun Li
A dual Z-scheme carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 photocatalyst were synthesized by simple solvothermal and calcination methods. The physical and chemical properties of prepared samples were explored via a series of characterization and Density Functional Theory (DFT) calculations. The formation mechanism of the composite photocatalyst was systematically studied and the formation process was simulated. Under the irradiation of visible light, 10% carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 exhibited the best photocatalytic performance. And the kinetics reaction model was followed pseudo-first-order kinetics. Moreover, the possible TC degradation pathways were established based on LC-MS. The enhanced photocatalytic activity was mainly attributed to the dual Z-scheme heterojunction formed by carbon-bridged g-C 3 N 4 deposition on the surface of Bi 2 O 3 and BiOI and a higher charge transfer rate of carbon-bridged g-C 3 N 4 , which effectively promoted the separation and transfer of electron-hole pairs. The trapping experiments were carried out to further explore its photocatalytic mechanism. This work provided an in-depth understanding of g-C 3 N 4 and bismuth-based catalysts.
研究领域:
材料科学
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光催化
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Qi Wang,Hong Wu,Qiaoyuan Gao,Dagang Lin,Yongjie Fan,Ran Duan,Yanqing Cong,Yi Zhang
Plasmonic Bi 0 modified BiOI-Bi 2 O 3 composite (Bi/BiOI-Bi 2 O 3 ) was prepared via in situ UV reduction method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) techniques were carried out to identify the formation of semimetal Bi 0 . The results indicated that the dot-like bismuth particles were originated from the partial reduction of lattice Bi 3+ to Bi 0 by accumulated conduction band electrons in BiOI-Bi 2 O 3 . The as-prepared ternary composite exhibited enhanced visible-light-response, decreased charge transfer impedance and higher charge carrier density relative to unmodified BiOI-Bi 2 O 3 . Due to synergistic effect between plasmonic Bi 0 and BiOI-Bi 2 O 3 heterojunction , dramatically enhanced photocatalytic activity for phenol degradation can be achieved. After 3.5 h visible light irradiation, the value for phenol removal efficiency was ca. 60% and 100% on BiOI-Bi 2 O 3 and Bi/BiOI-Bi 2 O 3 , respectively. The calculated zero-order rate constant on Bi/BiOI-Bi 2 O 3 was 1.7 and 3.9 times that on BiOI-Bi 2 O 3 and Bi 2 O 3 , respectively. In addition to phenol, organic dyes (zwitterionic RhB , cationic MB and anionic Org II) were also used as model pollutants. Pronounced photocatalytic degradation by Bi/BiOI-Bi 2 O 3 can be observed, further confirming the importance of Bi 0 . Trapping experiments using different scavengers indicated that photogenerated holes were major active species during the degradation of phenol. Furthermore, good stability was also observed in 5 successive cyclic runs. This study opens a new strategy for in situ preparation of plasmonic Bi 0 modified composite.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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