Article
Chemistry, Physical
Yuhong Wang, Dongsheng Wang, Hu Xu, Jun Yu, Tingting Chen
Summary: The design and construction of heterojunction photocatalysts, especially using metal-organic frameworks (MOFs), is found to enhance photocatalytic performance. In this study, a MOF-902(Ti) and BiOCl heterojunction (TB) was developed for efficient degradation of antibiotic tetra-cycline (TC) under visible light. The TB heterojunction exhibits superior photocatalytic activity compared to MOF-902(Ti) and BiOCl, attributed to improved visible light response, increased surface area/pore volume, enhanced charge carrier separation and transfer. Reactive species trapping confirms the involvement of center dot O2-, e-, and h+ in the TC photodegradation. A possible mechanism for the enhanced photocatalytic activity of TB heterojunction is proposed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Chunpeng Gao, Gang Liu, Xinmei Liu, Xiaoyi Wang, Miaomiao Liu, Yunlong Chen, Xue Jiang, Guanxiang Wang, Zhengchun Teng, Wenlong Yang
Summary: In this study, a flower-like BB-3 (n-Bi2O3/n-BiOCl) heterojunction photocatalyst was reported for the first time, showing significantly improved photocatalytic performance under visible light irradiation. The BB-3 heterojunction was synthesized using a one-step stirring method and exhibited superior photocatalytic activity compared to pure Bi2O3 and BiOCl, attributed to the enlarged absorption region and generated built-in electric field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Shuoping Ding, Tianao Dong, Tim Peppel, Norbert Steinfeldt, Juncheng Hu, Jennifer Strunk
Summary: Porous hierarchical microspheres composed of amorphous SiO2 and crystalline beta-Bi2O3 were synthesized via a solvothermal process and subsequent calcination, with amorphous SiO2 contributing to enhanced thermostability of beta-Bi2O3. Photocatalytic activity of the synthesized samples was found to be significantly influenced by phase composition and morphology, with samples containing highly crystalline beta-Bi2O3 phase exhibiting optimal performance in tetracycline hydrochloride degradation under visible light irradiation at low catalyst dosage. The synergistic effect of porous structure, light absorption capability, and charge carrier separation efficiency were identified as key factors contributing to the samples' photocatalytic activity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Tingwei Wang, Qian Zhu, Chen Huo, Zhengliang Yin, Qingye Shi, Junkai Tao, Fukun Su, Shunsheng Cao
Summary: Combining morphology modification with heterojunction is an effective approach to enhance the photocatalytic activity of TiO2-based photocatalysts for wastewater treatment. In this study, a novel flower-like TiO2/Bi2O3 (FTB) photocatalyst was developed by depositing Bi2O3 nanoparticles on the surface of flower-like TiO2 (FT). The successful formation of p-n heterojunction between flower-like TiO2 and Bi2O3 was confirmed, which facilitates efficient charge separation. Due to the narrow bandgap of Bi2O3 and the unique flower-like microstructure, FTB exhibits a photocurrent 1.67 times higher than that of FT, resulting in a higher photo-degradation rate (92.7%) of levofloxacin compared to FT photocatalyst (approximately 80%). Moreover, FTB demonstrates excellent anti-interference capability towards environmental factors and good cyclability. This work provides new insights into the development of TiO2-based photocatalysts with advanced performance for antibiotic removal.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Chemical
Pengwei Jia, Yuanliang Li, Zhanshen Zheng, Yan Wang, Tong Liu
Summary: Combining photocatalyst with piezoelectric materials is an effective way to improve the photocatalytic performance. In this study, a flower-like SrBi4Ti4O15/BiOCl composite is successfully prepared, and its photocatalytic degradation performance is significantly enhanced by the piezoelectric effect. Under the synergistic action of ultrasound and light, the polarized SrBi4Ti4O15/BiOCl exhibits a remarkable degradation rate of the dye RhB.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Pengwei Jia, Yuanliang Li, Zhanshen Zheng, Yan Wang, Tong Liu
Summary: The study proposes a flower-like SrBi4Ti4O15/BiOCl composite, whose photocatalytic degradation performance is effectively improved by piezoelectric effect, providing a new pathway for pollutant treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
Min Zhao, Yajun Yang, Zhenxing Zha, Shihai Cui, Yafei Li, Jing Yang
Summary: A carbon microsphere/BiOCl heterojunction with oxygen vacancy was synthesized by the hydrothermal method, and its structure, morphology, and physicochemical properties were investigated. The composite exhibited twice the photocatalytic activity for tetracycline degradation compared to pure BiOCl. The degradation products and pathways of tetracycline were analyzed using fluorescence spectroscopy and Fukui indices, and the possible photocatalytic mechanism was explored.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Chemical
Min Liu, Mengjie Lu, Huihui Xie, Xiaojuan Fu, Yao Wang, Weidong Zhang, Yahong Xie, Ying Qi
Summary: Flower-like Bi2WO6/BiOCOOH heterojunction photocatalysts were successfully synthesized by one-pot method. They exhibited enhanced visible light absorption and improved photocatalytic activity due to the efficient separation of photogenerated electron and hole pairs. The degradation experiments of tetracycline and ciprofloxacin under simulated sunlight irradiation demonstrated their excellent performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Baikang Zhu, Debin Song, Tianbo Jia, Wuyang Sun, Dongguang Wang, Luhui Wang, Jian Guo, Linglei Jin, Lu Zhang, Hengcong Tao
Summary: The direct Z-scheme 2D/2D heterojunction Fe3O4/Bi2WO6 photocatalyst showed efficient degradation of ciprofloxacin, with comparable photocatalysts prepared by controlling the hydrothermal temperature and iron content. This photocatalyst has potential for marine pollution treatment with boosted activities.
Article
Chemistry, Multidisciplinary
Haiyan Jiang, Yang Li, Xu Wang, Xiaodong Hong
Summary: The study successfully synthesized Bi2WO6/BiOCl composite photocatalysts through microstructure design and construction of heterojunctions, which exhibited excellent photocatalytic activity due to their unique nanostructure and heterojunction, facilitating efficient separation of photogenerated electrons and holes as well as physical adsorption of organic molecules. The generation of reactive species under visible light irradiation and the proposed Z-scheme heterojunction transfer mode further elucidate the photocatalytic mechanism of the composite material.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Hao Ma, Xia Yang, Xiaoning Tang, Xinyue Cao, Rong Dai
Summary: A series of beta-Bi2O3 materials with different Co doping amounts were prepared via a co-precipitation and pyrolysis process. Co doping enhanced the visible light utilization rate by reducing the band gap and improving electron-hole separation efficiency, leading to optimal efficiency for both electron-hole separation and antibacterial effect when doped with 0.4% Co. The enhanced antibacterial properties of 0.4%-CBO were attributed to increased production of reactive oxygen species (ROS), particularly center dot O-2(-), which contributed significantly to its antibacterial effect.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Daoguang Teng, Jie Qu, Peng Li, Peng Jin, Jie Zhang, Ying Zhang, Yijun Cao
Summary: This study developed a green strategy to synthesize a high-performance photocatalyst, α-Bi2O3/BiOCl composite material, for the degradation of organic dyes. The composite material exhibited excellent photocatalytic activity and a high removal rate under visible light irradiation.
Article
Chemistry, Physical
Yali Cui, Jian Zheng, Zhijia Zhu, Chunyan Hu, Baojiang Liu
Summary: The construction of heterojunction composites using suitable semiconductor materials is effective for the removal of organic pollutants from wastewater. Bi4O7/Cu-BiOCl nanocomposites were synthesized and characterized as photocatalysts. The composites showed excellent photodegradation performance and high stability in the degradation of tetracycline under visible light irradiation. Furthermore, the possible degradation pathways were investigated, and the mechanism was studied, providing a new approach for the design of bismuth-based heterojunction photocatalysts.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Engineering, Environmental
Mengchi Liu, Peng Ye, Men Wang, Lele Wang, Chao Wu, Jing Xu, Yuanping Chen
Summary: Constructing S-scheme heterojunction derived from metal-organic frameworks (MOFs) with high photoredox ability and boosted charge separation efficiency is promising in photocatalytic wastewater treatment. In this study, an S-scheme heterojunction composed of MOF-BiOCl and MoS2 nanosheets was constructed, resulting in enhanced degradation efficiency of tetracycline (TC). The optimized MOF-BiOCl/MoS2-3 composite exhibited the highest TC degradation rate. This improvement is attributed to the in situ synthesis of BiOCl nanosheets from Bismuth-MOFs, which preserved the ultrahigh porosity and specific surface area of the MOFs, and the intimate interfacial contacts provided by the 2D/2D geometry.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Maira Liaqat, Khalid Nadeem Riaz, Tahir Iqbal, Ghulam Nabi, Muhammad Rizwan, M. Shakil
Summary: Heterostructure BiVO4/Bi2O3 nanocomposites with enhanced visible light activity were synthesized through a hydrothermal route. The p-n heterojunction formed between the p-type Bi2O3 and n-type BiVO4 effectively reduced the recombination of photogenerated charge carriers, leading to excellent photocatalytic performance and stability.
