JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
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
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产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2024
·
IF 5.3
Jin Liu,Qian Zhong,Yanjin Wang,Zezhi Zhang,Huiqin Zheng,Bin Yan,Yurong Shi
Designing photocatalysts with p-n heterojunction structures is an effective way to boost the separation of photogenerated carriers and stimulate the photocatalytic degradation activity. Herein, an efficient visible-light responsive AgI/BiSI p-n heterojunction photocatalyst was successfully constructed. X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, and electrochemical measurements confirmed that the AgI/BiSI p-n heterojunction structure was beneficial to the separation and transfer of photogenerated carriers, promoting the generation of main active species (•O 2 − and h + ). Furthermore, the photocatalytic degradation rate constants of Acid Red 1 (0.4699 min −1 ) and metronidazole (0.0730 min −1 ) over the optimal AgI/BiSI were about 8.4 and 3.0 times higher than those over pure AgI, respectively. This work provides a heterojunction engineering strategy to design high-efficient photocatalysts for the degradation of refractory organic pollutants.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22550-22560
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IF 3.925
Lili Wang,Lei Chen,Mengyao Tang,Shoujie Jiang,Dawei Gao
A novel AgI/Ag6Si2O7/PET Z-scheme heterojunction photocatalyst with strong redox capability was fabricated via a facile successive ionic layer adsorption and reaction (SILAR) method to degrade methyl orange (MO). Compared with Ag6Si2O7/PET and AgI/PET, the prepared AgI/Ag6Si2O7/PET heterojunction exhibits superior photocatalytic performance under visible light because of its strong interfacial coupling effects. The degradation rate constant of the optimal AgI/Ag6Si2O7/PET is up to 0.144 min−1, which is approximately 5.5 and 9.6 times greater than that of Ag6Si2O7/PET and AgI/PET, respectively. The radical capture experiments and ESR characterization demonstrate that h+ and ˙O2− are two major oxidative species responsible for the photocatalytic degradation of dyes. The PL, photocurrent and EIS analyses indicate that AgI/Ag6Si2O7/PET shows enhanced electron–hole pair separation efficiency. This phenomenon is related to three aspects, namely the high light-harvesting efficiency, greatly enhanced accessibility to the active site, and the formation of Z-scheme heterojunction structures that effectively improve the photoelectron–hole separation efficiency and the redox capacity of the photocatalyst. Our work, therefore, provides novel insights into the development of a heterojunction composite with boosted photocatalytic activity, excellent stability, and reusability for the degradation of organic pollutants.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Feihu Zhang,Xinyan Xiao,Yu Xiao,Xia Cheng
Dye effluent is a serious threat to water ecosystem and human health, so it is urgent to develop high-efficient and stable semiconductor photocatalysts to solve the water pollution problem. A novel AgI/CAU-17 composite with 0D/2D hierarchical heterostructure was first constructed by growing AgI particles on CAU-17 nanorods via a mild deposition-precipitation procedure. The optimal 50% AgI/CAU-17 composite displayed the greatest photodegradation rate of 96.7% for RhB , 81.3% for TC and 50.3% for MO, under the simulated solar-light illumination for 70 min. The corresponding apparent rate constants were 0.04401, 0.02227 and 0.01104 min −1 , which were 23.79, 15.25 and 19.73-times higher than those of CAU-17, and 4.94, 1.79 and 6.29-times higher than those of AgI. The improved photodegradation performance could be owing to the following causes: 1) The 0D/2D hierarchical heterostructure endowed AgI/CAU-17 composite with tight interfacial contact, which could supply sufficient channels for the migration of photoinduced carriers; 2) The type II charge migrate pathway facilitated the segregation and migration of photoexcited carriers; 3) The AgI/CAU-17 heterostructures reinforced the light absorption capacity and augmented the specific surface area. In addition, various photocatalytic conditions were researched to imitate the degradation process of RhB in the real aqueous system. The radical capture experiments and EPR test attested that h + and •O 2 - played an important part in the photodegradation of RhB. This study illustrated the tremendous application potential of AgI/CAU-17 heterojunctions in water purification and provided a simple and reliable idea for the preparation of Bi-MOFs composite photocatalysts.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 28
·15782-15797
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IF 4.22
Jiang Danni,Zhou Yu,Wang Ping,Huang Chao,Zhu Jian,Liu Zhiming
In the MOFs-based composites, the co-catalyst nanoparticles loads tend to agglomerate. In the self-assembly process of MOFs-based composites, the use of acid modulators solved the accumulation of AgI nanoparticles cocatalyst. The active sites of carboxyl groups and mesoporous structure brought by acid modulator provide more loading sites for AgI nanoparticles. The novel AgI/D-MIL-53(Fe) showed good adsorption and photocatalytic performance in the process of removing tetracycline pollutants. Compared to the degradation efficiency of the MIL-53(Fe) with 50.8%, it of AgI/MIL-53(Fe) increased to 85.1% and which further increased to 96.2% by AgI/D-MIL-53(Fe) based on the HCl modulator. On the one hand, it is beneficial for the mesoporous D-MIL-53(Fe) modulated by HCl modulator to disperse the AgI nanoparticles co-catalyst. On the other hand, AgI nanoparticles, as a photosensitive agent, adsorb visible light to generate photogenerated electrons and holes, and electrons rapidly transferred to the heterojunction bridge Ag 0 and then captured by the holes from the D-MIL-53(Fe). The construction of AgI/D-MIL-53(Fe) Z-scheme heterojunction provided favorable conditions for the rapid separation and photogenerated electrons and holes. Finally, ·O 2 − , ·OH and h + as the main active free radicals were driving forces. This study provided more possibilities and opportunities for the construction of mesoporous MOFs-based composites.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 12
·4954-4968
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IF 1.941
Ding Tingting,Xiao Xinyan,Wang Yi,Lu Mingli
A novel 0D/2D Z-scheme AgI/Bi 24 O 31 Br 10 photocatalyst was prepared through the simple solvothermal and coprecipitation method, in which AgI nanoparticles were decorated on the surface of Bi 24 O 31 Br 10 nanosheets. The AgI/Bi 24 O 31 Br 10 composites exhibited improved photocatalytic activity for the degradation of rhodamine B (RhB) in comparison with pristine Bi 24 O 31 Br 10 and AgI under simulated sunlight irradiation. Specifically, AB-30 (mass fraction of AgI, 30%) composite exhibited remarkable photocatalytic activity of 97.6% towards RhB degradation under 120 min of simulated sunlight irradiation, and its RhB degradation rate constant ( k ) was approximately 20.7 and 2.9 times higher than that of pure Bi 24 O 31 Br 10 and AgI, respectively. The improvement of photocatalytic performance of as-prepared AgI/Bi 24 O 31 Br 10 heterojunction composites was ascribed to the synergistic effect of wide visible-light harvest capacity and the rapid transfer and separation efficiency of charge carriers. UV–vis diffuse reflectance spectra (DRS) analysis validated that the introduction of AgI could broaden the visible-light absorption of AgI/Bi 24 O 31 Br 10 composite. The results of electrochemical impedance (EIS), photocurrent response and photoluminescence spectra (PL) tests showed that AgI/Bi 24 O 31 Br 10 composite possessed the efficient separation and migration of photogenerated charge carriers. Trapping experiments of free radicals certified that ·O 2 − was the main reactive species in the process of degradation. And a probable photocatalytic mechanism of Z-scheme heterojunction between Bi 24 O 31 Br 10 and AgI was proposed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 8
·2298-2309
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IF 3.174
Shizi Luo,Xinyan Xiao,Yi Wang,Mingli Lu
BACKGROUND The commonly used RhB dye is a carcinogen that is widely found in environmental matrices and poses a threat to aquatic biota and human health. However, conventional wastewater treatment processes do not effectively remove low concentrations of these pollutants. Herein, the P-Bi 4 O 5 Br 2 /AgI (PBA) heterojunction was synthesized via a polyvinylpyrrolidone (PVP)-assisted solvothermal and precipitation method in this work. RESULTS The photocatalytic efficiency of the PBA heterojunction was evaluated by degrading rhodamine B (RhB) with the irradiation of simulated sunlight. P-Bi 4 O 5 Br 2 /AgI-50 (PBA-50, the mass fraction of AgI in the composite was 50%) composite could degrade 98% RhB under 90 min irradiation of 500 W Xenon lamp, and its pseudo first-order reaction rate constant was 0.04265 min −1 , which was 17.1, 2.16, and 2.94 times higher than that of Bi 4 O 5 Br 2 , P-Bi 4 O 5 Br 2 , and AgI, respectively. Besides, the effects of the dosage of photocatalyst and the anion on the photocatalytic degradation of RhB over PBA-50 were analyzed. CONCLUSION The enhanced photocatalytic activity of PBA was attributed to its better visible light capture ability, larger specific surface area, and faster photogenerated carrier separation efficiency, all of which were confirmed by scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), UV-Vis diffues reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical analysis. In addition, the free radical trapping experiments confirmed that ·O 2 − and h + were the main active species for degradation of RhB. Additionally, the smaller bandgap and the more negative conduction band position of Bi 4 O 5 Br 2 were reached after the introduction of PVP. Accordingly, a possible type-II heterojunction photocatalytic mechanism of P-Bi 4 O 5 Br 2 /AgI was proposed. © 2021 Society of Chemical Industry (SCI).
研究领域:
环境科学
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材料科学
·
光催化技术
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yue Tang,Xiaolin Pi,Huiying Li,Xueni Zhang,Lijun Luo,Fengzhi Jiang
This study presents the synthesis of highly active BiPO 4 /AgI/BC composite photocatalysts via a green, simple, and low-cost ambient temperature precipitation method. The electron transfer rate and visible-light responsiveness can be effectively enhanced by utilizing BiPO 4 compounded with the semiconductor AgI, which has a narrow bandgap and good visible-light responsiveness. Additionally, the introduction of biocarbon (BC) enhances the absorption and separation of photogenerated electrons and holes under visible light. Notably, the synthesized BP-AgI 0.6 -BC 5 % could remove 99.16 % and 99.7 % of EE2 and E2, respectively, at a concentration of 3 mg/L after 40 min of light exposure. The capture experiments and electron paramagnetic resonance spectroscopy reveal that the main active substance in the system is ·O 2 - , with BC playing a crucial role in enhancing the ·O 2 - concentration in the system. The findings from phytotoxicity and antimicrobial tests reveal that BP-AgI 0.6 -BC 5 % can efficiently degrade pollutants, producing degradation products that are substantially less toxic than the original pollutants. Moreover, it can remove more than 99.99 % of E. coli under both dark and light conditions, demonstrating excellent antimicrobial performance. Additionally, the photocatalytic mechanism and degradation pathway were examined in this study. Notably, the composite photocatalysts synthesized in this study achieved efficient degradation of EE2 and E2 under visible light conditions while exhibiting efficient bactericidal function. Furthermore, the room-temperature preparation method is conducive to industrial-scale production, highlighting a better prospect for practical applications.
研究领域:
环境科学
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材料科学
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生物学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Jushi Weng,Jun Chen,Yifei Xu,Xinru Hu,Chuangyun Guo,Yang Yang,Jingyi Sun,Lianshe Fu,Qing Wang,Jiamin Wei,Tinghai Yang
Increasing the exposure of active sites and improving the intrinsic activity are necessary considerations for designing a highly efficient photocatalyst. Herein, an In 2 S 3 /AgI stable Z-scheme heterojunction with highly dispersed AgI nanoparticles (NPs) is synthesized by the mild self-templated and in-situ ion exchange strategy. Impressively, the optimized In 2 S 3 /AgI-300 Z-scheme heterojunction exhibits superior photodegradation activity (0.020 min −1 ) for the decomposition of insecticide imidacloprid (IMD), which is extremely higher than that of pure In 2 S 3 (0.002 min −1 ) and AgI (0.013 min −1 ). Importantly, the three-dimensional excitation-emission matrix (3D EEMs) fluorescence spectra, high-resolution mass spectrometry (HRMS), the photoelectrochemical tests, radical trapping experiment, and electron spin resonance (ESR) technique are performed to clarify the possible degradation pathway and mechanism of IMD by the In 2 S 3 /AgI-300 composite. The enhanced photocatalytic performance is attributed to the highly dispersed AgI NPs on hierarchical In 2 S 3 hollow nanotube and the construction of In 2 S 3 /AgI Z-scheme heterojunction, which can not only increase active site exposure, but also improve its intrinsic activity, facilitating rapid charge transfer rate and excellent electron-hole pairs separation efficiency. Meanwhile, the practical application potential of the In 2 S 3 /AgI-300 composite is systematically investigated. This study opens a new insight for designing catalysts with high photocatalytic performance through a convenient approach.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Materials Science
·
2021
·Vol. 15
·期 2
·241-252
·
IF 2.765
Du Yan,Niu Ziwen,Yan Tingjiang,Zhu Kunlei,Yu Yang,Jing Zhihong
Carbon-molybdenum disulfide (C-MoS 2 ) ultrathin nanosheets were prepared by a hydrothermal process, and then AgI/C-MoS 2 were synthesized via an in-situ deposition method. This ternary heterojunction composite exhibited better photocatalytic activity compared with those of one-component (pristine MoS 2 ) and bicomponent (AgI/MoS 2 and C-MoS 2 ) materials for the degradation of organic dyes under the visible-light irradiation. In particular, by comparing with AgI/MoS 2 , the significant role of conductive amorphous carbon in AgI/C-MoS 2 in enhancing the charge transfer during the photocatalytic degradation of dyes was first confirmed by photocurrent response and electrochemical impedance spectroscopy (EIS). A possible photocatalytic mechanism was proposed based on the capture experiment results. Furthermore, a straightforward and interesting way had been applied to test the recycled/newly-prepared AgI/C-MoS 2 composite for revealing its distinctive self-cleaning performance and recyclability characteristic besides its good photocatalytic activity. This work could provide a reference for the design of other new ternary heterojunction composite materials with special structures and properties.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Jing Li,Dandan Wang,Siyuan Zhao,Rui Ma,Jifeng Guo,Zhuoya Li,Dong Wang,Yue Xuan,Liping Wang
Novel oxygen vacancies-enriched AgI/Cu-BiVO 4 (ACBV) S-scheme heterojunction catalysts were constructed to boost photocatalytic organics degradation and M. aeruginosa inactivation with peroxymonosulfate (PMS) assistance. Specific interfacial charge transfer and abundant active centers were guided by introducing Cu doping and AgI coupling into BiVO 4 , with the catalytic activity and mechanism systematically investigated. The optimal 0.25-ACBV heterojunction exhibited 97.6% tetracycline (TC) degradation under PMS-assisted visible light and achieved effective inactivation of M. aeruginosa within 20 min (78.8%). The S-scheme heterostructure from Cu-BiVO 4 to AgI and synergistic effects endowed the system with high-energy carrier transfer kinetics and strong oxygen reduction capability. Meanwhile, the redox cycling of Cu 2+ /Cu + and surface oxygen defects served as electron acceptors to accelerate interfacial charge separation and as adsorption activation sites for PMS, promoting efficient mass transfer in the non-homogeneous system. This study inspires the design of high-performance S-scheme photocatalytic activators and expands their potential applications in environmental remediation.
研究领域:
环境科学
·
光催化材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
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IF 9.7
Chuantao Wang,Xiang Li,Xueting Lv,Xin Huang,Yueyue Zhao,Tiantian Deng,Jiale Zhang,Jun Wan,Yanzhong Zhen,Tuo Wang
The construction of S-scheme heterojunction with excellent redox ability holds promising prospects for photocatalytic environment remediation. However, the rationally design of the heterojunction interface to achieve efficient charge transfer still faces challenges. In this study, we fabricated a tight-contacted S-scheme heterojunction by in situ anchoring AgI nanoparticles onto WO 3 nanoplates. The significant difference in Fermi energy levels between WO 3 and AgI results in the formation of a space charge region around the interface and bending of the energy band, facilitating directional migration and spatial separation of charge carriers. This contributes to enhanced generation of superoxide radicals (•O 2 − ) and holes (h + ) active species, leading to a significant increase in chlortetracycline (CTC) degradation rate. The apparent rate constant for CTC removal using the WO 3 /AgI (WA-2) is approximately 15 times higher than that observed for pure WO 3 . Furthermore, WA-2 exhibits universal degradation effects on tetracycline (TC) and oxytetracycline (OTC). Molecular dynamics (MD) simulation reveals the synergistic adsorption effect of WO 3 and AgI on CTC and reactive oxygen species molecules. Based on Fukui function calculation of CTC molecules and degradation intermediates, liquid chromatography-mass spectrometry (LC-MS) analysis, photocatalytic degradation pathway over WO 3 /AgI was determined to be sequential demethylation followed by dechlorination and decarbonylation. These findings provide valuable insights into high-performance S-scheme heterojunctions interface design and elucidation of pollutant degradation mechanism.
研究领域:
环境科学
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材料科学
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计算化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）