SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Changming Zhang,Guomin Xu,Xiaochao Zhang,XiuShuai Guan,Wensheng Wu,Jinbo Xue,Caimei Fan
It is rather important to increase CO 2 adsorption capacity and improve separation efficiency of photo-induced carriers for solar-driven photocatalytic CO 2 reduction. Herein, millimeter-sized nitrogen-doped porous carbon spheres (NPCS-F6) with metal-like activity, as bifunctional support to immobilize and tailor Bi 2 Sn 2 O 7 nanoparticles (Bi 2 Sn 2 O 7 /NPCS-F6) for enhancing CO 2 photoreduction activity, have been constructed by suspension polymerization assisted with carbonization and impregnation method. Bi 2 Sn 2 O 7 /NPCS-F6 composite photocatalyst realized the photocatalytic CO 2 reduction activity to CO of 203.25 μmol·g −1 under 8 h simulated sunlight irradiation, approximately 1.34 times and 11.53 times higher than that of pure Bi 2 Sn 2 O 7 (152.03 μmol·g −1 ) and NPCs-F6 (17.61 μmol·g −1 ), respectively. The excellent CO 2 reduction activity should be attributed to the synergistic effect of Bi 2 Sn 2 O 7 and NPCS-F6, in which Bi 2 Sn 2 O 7 loaded on the surface of NPCS-F6 improved the hydrophobic property, promoted the oxidation reaction of H 2 O and provided more effective electrons for photocatalytic CO 2 reduction. On the other hand, large specific surface area and alkaline nitrogen species (N-6, N-5) of NPCS-F6 provided more reaction sites, while hierarchical pore structure and N-Q as electron transfer channels favored the separation of photogenerated electron-hole pairs. Finally, the possible photocatalytic CO 2 reduction mechanism for Bi 2 Sn 2 O 7 /NPCS-F6 was proposed. Our findings should provide a favorable and feasible strategy to immobilize powder photocatalyst on millimeter-sized bifunctional carbon spheres for efficient photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Chenyan Wu,Qianhong Shen,Suhua Zheng,Xinyu Zhang,Jiansong Sheng,Hui Yang
A novel Bi 2 Sn 2 O 7 @MIL-100(Fe) composite photocatalyst was fabricated by loading Bi 2 Sn 2 O 7 nanoparticles on the surface of mesoporous MIL-100(Fe). The structure-property relationships of such composite photocatalyst were studied. The results exhibit that the formed Bi 2 Sn 2 O 7 @MIL-100(Fe) heterojunction promote the separation of photo-generated carriers, leading to the enrichment of photo-generated electrons on MIL-100(Fe). Meanwhile, MIL-100(Fe) can provide more active sites for photocatalytic reaction due to its extraordinary specific surface area. Therefore, the Bi 2 Sn 2 O 7 @MIL-100(Fe) composite photocatalyst exhibits excellent superoxide-radical-dominated photocatalytic activity and is more propitious to degrading the contaminants such as ciprofloxacin, which can be efficiently degraded in the absence of superoxide radicals. The Bi 2 Sn 2 O 7 @MIL-100(Fe) composite reveals enhanced photocatalytic activity for degrading ciprofloxacin with rate constant (0.0143 min −1 ) 1.96 and 3.86 times higher than that of pure MIL-100(Fe) (0.0073 min −1 ) and pure Bi 2 Sn 2 O 7 (0.0037 min −1 ), respectively.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Hanlu Zeng,Yunlan Xu,Dengjie Zhong,Yuqin Yang,Qingmei Qiao
Photocatalytic fuel cell (PFC) provides a new method to degrade organic pollutants and recover their energy simultaneously. In this work, a novel flower-like hierarchical photoanode (PANI/Bi 2 Sn 2 O 7 /BiOBr/Ti) was synthesized by solvothermal method and assembled with Cu cathode to form a PFC for rhodamine B (RhB) degradation and simultaneous power generation. The crystal structure, chemical composition, and morphology of the photoanode was characterized by a variety of analysis techniques. The photocatalytic activity of the ternary hierarchical composite photoanode was superior to that of single and binary composite photoanodes. Its maximum photocurrent density, maximum power density, degradation rate and FF were 0.241 mA·cm −2 , 21.52μW·cm −2 , 92.97 % (90 min) and 0.18, respectively. In addition, it still maintains high photocatalytic activity after five consecutive uses. Based on the analysis results of transient photocurrent (i-t), EIS, DRS spectrum, M-S curve and free radical capture experiments, the improvement of photocatalytic performance of PANI/Bi 2 Sn 2 O 7 /BiOBr/Ti photoanode is attributed to the formation of dual Z-scheme heterojunction between PANI and BiOBr and between Bi 2 Sn 2 O 7 and BiOBr, which realizes the rapid separation and transfer of electron-hole pairs, and retains the strong oxidation of holes in VB of BiOBr and the strong reduction of electrons in LUMO of PANI and CB of Bi 2 Sn 2 O 7 . This study provides a new research idea for the design and construction of high efficiency photoanode in PFC system.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jinru Lin,Pengfei Zhu,Mei Liu,Ming Duan,Han Lu,Zhaoxin Huang
An all-solid-state Z-scheme Bi 4 O 5 I 2 /GO/Bi 2 Sn 2 O 7 (BI41/1.5GO/BS41) ternary heterojunction was constructed by hydrothermal-ultrasonic assisted aqueous precipitation-heat treatment method. Taking the degradation effect of tetracycline hydrochloride (TC-HCl) as a reference, the BI41/1.5GO/BS41 composite catalyst exhibits the best photocatalytic performance, and its photocatalytic reaction rate constant is 3.82 that of Bi 2 Sn 2 O 7 . When the dosage of BI41/1.5GO/BS41 was 0.8 g/L, the degradation rate of TC-HCl solution with initial concentration of 15 mg/L was 90.31 % (pH=8) under visible light irradiation for 120 min. Moreover, the BI41/1.5GO/BS41 also has excellent salt tolerance, universality and recycling stability. The free radical capture experiments and electron paramagnetic resonance (EPR) tests found that •O 2 and h + were the main active substances for photocatalytic degradation of TC-HCl. The characterization results show that the improvement of photocatalytic performance of BI41/1.5GO/BS41 is due to the successful construction of all-solid-state Z-scheme heterojunction with graphene oxide (GO) as an electron transport medium, which not only reduces the transfer resistance of photogenerated electrons but also improves the separation efficiency of photogenerated carriers. Finally, the TC-HCl solution after visible light degradation was detected by the liquid chromatography mass spectrometry (LC-MS), and the possible intermediate products and degradation pathways were speculated. This work provides a new perspective on the application of all-solid-state Z-scheme heterojunction photocatalysts to environmental remediation.
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
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 24
·7277-7289
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IF 4.478
Wang Min,Hou Li,Chen Xiaoyu,Lin Tianran
A simple homogeneous photoelectrochemical (PEC) sensing platform based on an alkaline phosphatase (ALP)–mediated pesticide assay was established for the sensitive detection of omethoate (OM). The Bi 2 S 3 @Bi 2 Sn 2 O 7 heterojunction was used as a photoactive material to provide stable background photocurrent signals. The inhibition of OM on ALP and PEC determination was carried out in the homogeneous system. In the absence of OM, dephosphorylation of L-ascorbic acid 2-phosphate trisodium salt (AAP) was catalyzed by ALP to produce the enzyme-catalyzed product (L-ascorbic acid, AA). AA, as an electron donor, could capture photogenerated holes on the Bi 2 S 3 @Bi 2 Sn 2 O 7 heterojunction, thus inhibiting the recombination of electron holes to achieve an increase of the photocurrent signal. When the OM was introduced, the enzyme activity of ALP was reduced due to the organophosphorus pesticides (OPs)–based enzyme inhibition, and the AA produced by catalytic hydrolysis was also reduced, thus reducing the photocurrent signal. Compared with the traditional PEC sensor for OPs, this homogeneous PEC sensor avoided immobilization procedures, covalent labeling, separation, and the steric hindrance effect caused by immobilized biomolecules, which achieved high recognition efficiency and caused a reduction in analysis time. Additionally, an ALP-mediated pesticide assay for the determination of OPs with a simplified experimental process further improved the stability and reproducibility of the PEC sensor. The PEC sensor showed high sensitivity to the target OM within a dynamic range of 0.05 ~ 500 ng mL −1 , and the detection limit was 0.0146 ng mL −1 . Additionally, the PEC biosensing system showed good selectivity and anti-interference ability, and exhibited a satisfactory result in spinach and mustard samples. Graphical abstract A homogeneous PEC biosensor based on ALP inhibition strategy was constructed for OM detection in vegetable samples via Bi 2 S 3 @Bi 2 Sn 2 O 7 heterojunction as the photoactive substrate material
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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生物传感器
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农药分析
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DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
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2025
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IF 1.7
Wang Wenxue,Zhan Su,Liu Canwen,Zhou Lin,Zhou Feng
To address the issue of high electron–hole recombination rate in conventional catalysts used for the photocatalytic treatment of ballast water, this work designed and synthesized a Bi 2 Sn 2 O 7 /BiOCl heterojunction photocatalyst via a simple hydrothermal method. After 30 min of simulated sunlight irradiation, it exhibited outstanding inactivation efficiency against marine bacteria. The Bi 2 Sn 2 O 7 /BiOCl-0.6 heterojunction achieved an inactivation efficiency of up to 92%, 2.4 times higher than that of pure Bi 2 Sn 2 O 7 . Performance experiments and electrochemical analysis demonstrate that the heterojunction optimizes electron transfer pathways, enhances electron–hole separation efficiency, and promotes the generation of hydroxyl radicals, thereby significantly improving photocatalytic performance. This study offers novel insights for developing highly efficient photocatalytic ballast water treatment materials suitable for complex marine environments. Graphical abstract
研究领域:
环境科学
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材料化学
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光催化
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海洋环境工程
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2016
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IF 2.477
Xiaojuan Zhao,Jiajie Yu,Hongda Cui,Tianhe Wang
In this study, for the first time, BSO/g-C 3 N 4 composite photocatalysts were synthesized by high temperature solid-state reaction method. The influence of systematically varied g-C 3 N 4 contents on the photocatalytic activity was investigated in detail. The photocatalytic activity of the catalysts was evaluated through the degradation of methylene blue (MB) and acid red 18 (AR 18) as target pollutants under visible light irradiation. The results demonstrated the photocatalytic performance of the BSO/g-C 3 N 4 composites was greatly enhanced compared to pure photocatalyst. In addition, the optimized photocatalytic efficiency for MB and AR 18 was achieved when the mass percentage of g-C 3 N 4 in the composite was 60%. And based on our analysis, it is proposed that the BSO/g-C 3 N 4 has the characteristic of direct Z-scheme type photocatalyst. The excellent photocatalytic performance was interpreted in terms of enhanced visible light absorption and efficient separation of electrons and holes. Compared with hydrothermal method, this method only involves sintering in air at a moderately elevated temperature, so it is efficient and more preferred for industrial scale production.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Haidong Luo,Shengjiang Zhang,Fozia Batool,Suhang Chen,Fengqi Zhao,Kangzhen Xu
The construction of an S-scheme heterostructure is considered as a promising strategy for enhancing photocatalytic performance. Herein, a three-dimensional Bi 5 O 7 I (BOI) microsphere decorated with Bi 2 Sn 2 O 7 (BSO) nanoparticles was prepared for the first time via a simple ultrasonic-assisted electrostatic self-assembly strategy and used for the degradation of 2,4-dinitrophenylhydrazine. 3 wt% Bi 2 Sn 2 O 7 /Bi 5 O 7 I has the highest degradation activity (93.7 %), with an apparent rate constant of 0.0848 min −1 , which is 2.55 times that of the original Bi 5 O 7 I (0.0333 min −1 ). Moreover, the optimal binary heterojunction photocatalyst has good reusability and universal applicability. The results of cyclic voltammetry tests clarify that the optimal photocatalyst can provide more surface reactive sites. The results of radical trapping experiments and electron spin resonance indicate that holes (h + ) and superoxide radicals are the main active radicals in the degradation process of 2,4-dinitrophenylhydrazine. Photoelectrochemical and photoluminescence confirm that 3 wt% Bi 2 Sn 2 O 7 /Bi 5 O 7 I composites exhibit the highest separation rate of photogenerated carriers. Finally, based on the results of experimental studies and theoretical calculations, the S-scheme charge transfer path on Bi 2 Sn 2 O 7 /Bi 5 O 7 I composite is determined. This work provides a new perspective on how to design high-performance S-scheme bismuth oxyhalide-based heterojunction photocatalysts for solar energy conversion.
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
PubMed
高影响因子
ACS Sensors
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2024
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IF 8.2
Tianshuang Wang,Wei Tao,Xueying Kou,Liupeng Zhao,Peng Sun,Geyu Lu
Constructing a bilayer structure has not been reported as a method to mitigate the adverse effect of water poisoning on oxide chemiresistors while simultaneously enhancing gas selectivity and sensitivity. To address this challenge, pyrochlore-Bi2Sn2O7 has been first utilized as an overlayer on a ZnO sensing layer for constructing a bilayer acetone chemiresistor, leading to remarkable improvement in the performance for trace-level (500 p-p-b) acetone detection under high humidity (80% relative humidity). In addition, owing to the catalytic predecompositions of ethanol across the overlayer, an outstanding acetone gas selectivity (Sacetone/Sethanol = 2.9) has been achieved, with a more than 4-fold improvement compared with monolayer ZnO chemiresistor (Sacetone/Sethanol = 0.7). More significantly, comprehensive experiments coupled with in situ characterizations have verified the generation of hydroxyl radicals (•OH) on the Bi2Sn2O7 overlayer. These radicals are capable of enhancing the kinetics between •OH and acetone, reducing the activation energy required for the gas sensing reaction, and thus leading to an unexpected phenomenon of enhanced acetone sensitivity under high humid conditions (Sacetone at 80% RH > Sacetone at 5% RH). These demonstrations offer crucial insight into the precise design of highly efficient overlayers for breath sensing.
研究领域:
材料科学
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传感器技术
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医学检测
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Shiming Zhang,Yiyuan Rong,Jingwen Wei,Zhihong Li,Ting Liang,Zebin Yu,Hongxiang Zhu,Shuangfei Wang,Yanping Hou
Fabrication of efficient photocatalysts with great visible light utilization ability, rapid carriers’ separation, and suitable redox potential is essential for improving photocatalytic CO 2 reduction. Herein, flower-like microspheres Bi 2 Sn 2 O 7 /NiAl-layered double hydroxide (BSO/LDH) heterojunctions were prepared by hydrothermal process for CO 2 reduction. The Bi 2 Sn 2 O 7 nanoparticles were dispersed on NiAl-LDH nanosheets, with tight contact interface, which facilitated charges transfer and exposing more catalytic active sites. Results of photochemical deposition of metal/metal oxide demonstrated that interfacial charges transfer of the BSO/LDH followed Z-scheme mechanism, endowing more desired redox potential and more efficient carriers separation. The 30%-BSO/LDH showed the highest CO and CH 4 yields of 37.91 and 1.18 μmol g −1 h −1 under visible light irradiation, 3.4 and 2.0 times higher than those from the NiAl-LDH, respectively. The main intermediates during CO 2 reduction were carboxylate (COOH*) and aldehyde group (CHO*), and CO 2 reduction pathways and mechanism were proposed accordingly. This study provided referential strategy for designing efficient heterojunction photocatalysts for CO 2 conversion.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
ACS Sensors
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2026
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IF 10.9
Yiwen Zhou,Zichen Zheng,Kewei Liu,Marc Debliquy,Carla Bittencourt,Chao Zhang
Chemiresistive gas sensors designed for the detection of agricultural volatile organic compounds (VOCs) play a crucial role in monitoring crop growth and ensuring the quality of agricultural products. However, conventional metal oxide gas sensors continue to encounter challenges related to high power consumption and limited detection capabilities. In this study, bismuth stannate oxide Bi2Sn2O7 (BSO) quantum dots were synthesized via a hydrothermal method to facilitate room-temperature detection of 1-octanol. A systematic investigation was conducted to elucidate the relationship between the gas sensing performance of the material and its microstructure, surface valence states, and electronic structure. The BSO-8 sensor, characterized by an exceptionally high specific surface area (BET = 143.57 m2 g−1), demonstrated a wide detection range of 1−50 ppm, exhibiting a remarkable response of 75.06 ± 1.25 at 50 ppm under 30% relative humidity. Additionally, the sensor displayed excellent reproducibility, long-term stability, and significant selectivity toward 1-octanol. Further mechanistic insights were obtained through valence band spectroscopy and density functional theory calculations, which provided a comprehensive understanding of the evolution of the electronic structure and gas adsorption behavior. These findings demonstrate the potential of BSO-based sensors for practical applications in detecting 1-octanol at 30% RH, highlighting its significance as a key biomarker for agricultural VOCs.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Di Zhang,Maoquan Wu,Juanyuan Hao,Shengliang Zheng,Yang Yang,Tongjie Yao,You Wang
Promoting charge migration and enhancing redox ability of photogenerated carriers are important for the development of highly efficient semiconductor-based photocatalyst. Here, BiOBr/Bi 2 Sn 2 O 7 heterojunction with oxygen vacancies (OVs) was constructed by homogeneously depositing Bi 2 Sn 2 O 7 nanoparticles on the Vo-BiOBr surface. The experimental results manifested that Vo-BiOBr/Bi 2 Sn 2 O 7 displayed better performance for rhodamine B, ciprofloxacin, and tetracycline degradation than counterparts without OVs . The characterization results proved OVs played the essential role for enhanced performance via improving the separation efficiency of charge carriers, increasing the visible light harvest, and lowering conduction band position. Moreover, mechanism study revealed that an inner electric field was built at the interface, leading to a Z-scheme path of photogenerated electron. This study provided an efficient strategy for designing highly efficient photocatalyst for solving environmental pollution.
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
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