Catalysts
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2022
·Vol. 12
·期 12
·1635
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IF 4.501
Mingjun Wang,Che Li,Bingfang Liu,Wenzhen Qin,Yu Xie
Heterojunction photocatalytic materials show excellent performance in degrading toxic pollutants. This study investigates the influence of calcination temperature on the performances of floral Bi2O3/TiO2composite photocatalyst crystal, which was prepared with glycerol, bismuth nitrate, and titanium tetrachloride as the major raw materials via the solvothermal method. XRD, SEM/TEM, BET, Uv-vis, and XPS were employed to analyze the crystal structure, morphology, specific surface area, band gap, and surface chemical structure of the calcined temperature catalysts. The calcination temperature influence on the catalytic performance of composite photocatalysis was tested with rhodamine B (RhB) as the degradation object. The results revealed the high catalytic activity and higher photocatalytic performance of the Bi2O3/TiO2catalyst. The degradation efficiency of the Bi2O3/TiO2catalyst to RhB was 97%, 100%, and 91% at 400 °C, 450 °C, and 500 °C calcination temperatures, respectively, in which the peak degradation activity appeared at 450 °C. The characterization results show that the appropriate calcination temperature promoted the crystallization of the Bi2O3/TiO2catalyst, increased its specific surface area and the active sites of catalytic reaction, and improved the separation efficiency of electrons and holes.Keywords:calcination temperature;Bi2O3/TiO2compound;visible light;photodegradation
研究领域:
材料科学
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环境化学
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光催化
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DOI
高影响因子
MOLECULES
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2023
·Vol. 28
·期 2
·882
·
IF 4.6
Mingjun Wang,Che Li,Bingfang Liu,Wenzhen Qin,Yu Xie
Photocatalysis is a hopeful technology to solve various environmental problems, but it is still a technical task to produce large-scale photocatalysts in a simple and sustainable way. Here, nano-flower β-Bi2O3/TiO2composites were prepared via a facile solvothermal method, and the photocatalytic performances of β-Bi2O3/TiO2composites with different Bi/Ti molar ratios were studied. The nano-flower Bi2O3/TiO2composites were studied by SEM, XRD, XPS, BET, and PL. The PL result proved that the construction of staggered heterojunction enhanced the separation efficiency of carriers. The degradation RhB was applied to study the photocatalytic performances of prepared materials. The results showed that the degradation efficiency of RhB increased from 61.2% to 99.6% when the molar ratio of Bi/Ti was 2.1%. It is a mesoporous approach to enhance photocatalytic properties by forming heterojunction in Bi2O3/TiO2composites, which increases the separation efficiency of the generated carriers and improves photocatalytic properties. The photoactivity of the Bi2O3/TiO2has no evident changes after the fifth recovery, indicating that the Bi2O3/TiO2composite has distinguished stability.Keywords:Bi2O3/TiO2;heterojunction;photocatalysts;degradation RhB
研究领域:
环境科学
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材料科学
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化学
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DOI
PubMed
高影响因子
International Journal of Nanomedicine
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2025
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IF 6.5
Zhiyu Zheng,Gareth R Williams,Honghua Guo,Yilu Zheng,Mengting Xiu,Yanyan Zhang,Huan Zhang,Kai Wang,Jindong Xia,Yu Wang,Li-Min Zhu
Purpose Owing to the limitations of single-mode cancer treatments, combination therapies have attracted much attention. However, constructing a platform for combination therapies in a simple and effective way and improving the overall treatment effect remains a challenge. Our aim was to combine sonodynamic therapy, radiotherapy and chemotherapy together and improve therapeutic outcomes within one nanoplatform.Methods In this work, we sought to exploit the properties of nanoscale heterojunctions to this end. A multifunctional Bi2O3-TiO2@polydopamine-doxorubicin (BTPD) nanoparticle platform was constructed as an anti-cancer theranostic. Under ultrasound irradiation, the Bi2O3-TiO2 core can generate singlet oxygen to damage tumor cells. Meanwhile, the high-Z Bi2O3 can attenuate the energy of X-rays and scatter secondary electrons to enhance radiation damage in the tumor. A thin coating of polydopamine (PDA) increases the biocompatibility but also gives the particles the ability for photoacoustic imaging. Doxorubicin, a DNA repair inhibitor which can hinder tumor recovery from radiation damage, was loaded onto the PDA.Results A comprehensive series of in vitro and in vivo assays demonstrated that the nanoparticles were effectively taken up into cancer cells, where they could induce ROS production and cause cell death. In vivo, this led to a marked reduction in tumor volume in a murine 4T1 cancer model.Conclusion The formulations developed here have significant potential for future investigation and exploration in the treatment of cancer.
研究领域:
肿瘤学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yan Wang,Shengzhe Zhao,Yi Yang,Raul D. Rodriguez,Anya Lipovka,Yun Lu,Honglan Huang,Jinju Chen
Ag nanoparticle-decorated Bi 2 O 3 -TiO 2 heterogeneous photocatalysts were successfully obtained by combining facile sacrificial templates and photoreduction . The as-synthesized Ag@Bi 2 O 3 -TiO 2 photocatalysts with a narrow band gap of 2.40 eV exhibited considerable photocatalytic activity to degrade rhodamine B (RhB) and tetracycline hydrochloride (TCH), and the removal efficiency reached 100% and 92%, respectively. Ag@Bi 2 O 3 -TiO 2 photocatalysts also exhibited stable recyclability for the degradation of RhB and TCH. Trapping experiments helped determine the major reactive oxidative species for TCH photodegradation . The desirable photodegradation performance is mainly attributed to improved light absorption , enhanced charge separation, and strong redox capacity of Ag@Bi 2 O 3 -TiO 2 nanostructures with S-scheme heterojunction . This work provides a facile avenue to construct heterogeneous tubular nanostructures with intensive photoabsorbance and effective photocatalysis to degrade organic contaminants.
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
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Yunfang Huang,Yuelin Wei,Jing Wang,Dan Luo,Leqing Fan,Jihuai Wu
Three-dimensional Bi 2 O 3 /TiO 2 hierarchical composites have been successfully prepared by a two-step hydrothermal method and subsequent calcination. The samples were characterized using XRD, SEM, TEM, EDS, BET and DRS. The measurement results signified that heterojunctions of various morphologies β -Bi 2 O 3 growing on the three-dimensional hierarchical anatase TiO 2 nanorods arrays on FTO glass were apparently formed. The morphology of Bi 2 O 3 changed from three-dimension flower-like microstructures to the sphere-like nanoparticles as the Li(OH) dosage increased. The photocatalytic results showed that all samples exhibited much higher photocatalytic activities than that of pure Bi 2 O 3 and TiO 2 (P25) in photocatalytic degradation of methyl blue (MB) under visible-light irradiation. Whereas BTL4 sample exhibited the highest photoactivity with increasing the dosage of Li(OH) to 2 mmol. Furthermore, the absorption edge of the Bi 2 O 3 /TiO 2 series composites displayed a broad-spectrum photoabsorption from UV to visible-light compared with the individual component. The as-synthesized Bi 2 O 3 /TiO 2 composites possessed excellent photocatalytic activity and outstanding recyclability. The enhanced photocatalytic efficiency was mainly attributed to the Bi 2 O 3 /TiO 2 p - n heterojunctions and hierarchical nanostructure. The recombination of photogenerated electron–hole pairs was efficiently suppressed by the Bi 2 O 3 /TiO 2 p - n heterojunctions.
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 Water Process Engineering
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2020
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IF 3.465
Nan Wang,Xing Li,Yanling Yang,Zhiwei Zhou,Yi Shang,Xiaoxuan Zhuang
The photocatalytic degradation of sulfamethoxazole (SMX), sulfadiazine (SDZ) and sulfamethazine (SMT) by Bi 2 O 3 -TiO 2 /PAC under solar light irradiation was studied. The results exhibited that Bi 2 O 3 -TiO 2 /PAC composite prepared by two-stage calcination method contained of rutile and anatase mixed crystal phases, and it had visible light response capability. In addition, Bi 2 O 3 -TiO 2 /PAC had a certain adsorption capacity for SMX, SDZ and SMT, and its saturated adsorption mass was 30.88, 11.28 and 26.24 mg/g, respectively. Compared to photolysis and adsorption process, the photocatalytic degradation efficiencies of the three sulfonamides were significantly improved, and more than 99 % of photocatalytic degradation efficiency was achieved. The EPR measurements showed that both hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ) were produced in the photocatalytic process. However, trapping experiments confirmed that photo-generated hole (h + ) played a lead role in the photocatalytic degradation of SMX. Contrarily, the ·O 2 - was the main oxidative species for SDZ and SMT degradation. Furthermore, the effects of initial pH of solution, sodium bicarbonate, humic acid and natural water (lake and river water) on the photocatalytic degradation were investigated. The photocatalytic degradation pathways of Bi 2 O 3 -TiO 2 /PAC for sulfonamides were discussed. There were differences degradation pathways of the SDZ, SMT and SMX by Bi 2 O 3 -TiO 2 /PAC mainly reflected in: Hydroxylation of benzene ring, extrusion of SO 2 . While, similar pathways existed in the process of sulfanilamide degradation, such as the breaking of S N bond and the cracking of N-containing benzene ring.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
Materials Today Chemistry
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2018
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IF 0
Ce Wang,Chao Tan,Weiqiang Lv,Gaolong Zhu,Zhaohuan Wei,Kelvin H.L. Zhang,Weidong He
In this work, we report the synthesis of a Bi 2 O 3 -TiO 2 hetero-junction (HJ) material through a facile colloidal method. The hetero-junction formation follows a growth with a 145°Bi 2 O 3 /TiO 2 crystal angle, owing to the large lattice mismatch between Bi 2 O 3 and TiO 2 crystals. With the Bi 2 O 3 -TiO 2 hetero-junction material as a photocatalyst , methyl orange is degraded completely within two hours under common UV-lamp irradiation. The photo-catalyst remains highly-active for complete photo-degradation of methyl orange even after multiple experiments. The remarkable photo-catalytic properties are attributed to the remarkable mono-dispersivity of the colloidal Bi 2 O 3 -TiO 2 nano-structure as well as the refined band structure with a valence band of 0.85 eV below that of TiO 2 crystal.
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
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
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2020
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IF 1.724
Feng Zhou,Xianghong Ren
1,1-Dimethylhydrazine (UDMH) and its by-products were considered carcinogenic toxins and represent a serious health hazard to the population once present in water under natural conditions without treatment. The conventional degradation method suffers from incomplete removal of intermediate products (especially N-nitrosodimethylamine (NDMA)), the powdery catalysis being difficult to recover and results in high energy consumption. In this study, a series of Bi2O3/TiO2/Al2O3 (BTA) photocatalysts have been successfully synthesized by a simple dry mixing method with powder material followed by their immobilization. It was evaluated by the photocatalytic degradation of UDMH present in wastewater, which can be recovered by rapid filtration and utilizes only solar energy. The catalyst exhibited markedly enhanced photocatalytic activity for the degradation of UDMH wastewater compared with conventional TiO2/Al2O3 (TA) catalysts under UV, visible and solar irradiation. Besides, the intermediate NDMA was gradually completely degraded. The photocatalysts were extensively characterized using scanning electron microscopy, energy dispersive spectrometry, specific surface area (BET), X-ray diffraction, X-ray photoelectron spectroscopy, UV–visible diffuse reflectance spectroscopy and photo-electrochemical I–t curves evaluation. The results revealed that all the BTA composites exhibited high stability and stronger absorbance in visible light. In addition, the BTA exhibited a reversible photochromic property that can effectively expand the range of light absorption and enhance the photocatalytic activity. The reversible photochromic properties of BTA explained in the proposed mechanism model are expected to be useful for detecting and sensing UDMH or other organic contaminants.
研究领域:
环境科学
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催化化学
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材料科学
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DOI
高影响因子
Journal of Water Process Engineering
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2020
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IF 3.465
Nan Wang,Xing Li,Yanling Yang,Zhiwei Zhou,Yi Shang,Xiaoxuan Zhuang,Tingting Zhang
In a previous study, we used a sol-hydrothermal method with a one-stage calcination in an air atmosphere at 400 °C to prepare composites of Bi 2 O 3 -TiO 2 supported on powdered activated carbon (Bi-Ti/PAC-1). However, the photocatalytic efficiency of those composites was relatively low due to their high band gap and the single crystal phase of their TiO 2 . To improve the photocatalytic efficiency, we developed a two-stage calcination method with a first calcination in air at 300 °C followed by a second calcination in a N 2 atmosphere (at 500, 600, or 700 °C) to form the Bi 2 O 3 -TiO 2 composites (Bi-Ti/PAC-2). Compared with Bi-Ti/PAC-1, the photocatalytic degradation efficiency of sulfamethazine (SMT) by Bi-Ti/PAC-2-700 increased by 32 % under solar light irradiation. Bi-Ti/PAC-2-700 contained two TiO 2 crystal phases, rutile and anatase, and its band gap was 2.58 eV, far less than that of Bi-Ti/PAC-1. Electron paramagnetic resonance measurements and trapping experiments showed that the superoxide radical, hole, and hydroxyl radical each played an important role in the degradation of SMT, among which the superoxide radical predominated. The degradation pathway of SMT included four processes: oxidation of hydroxyl radical, SO 2 extrusion, N C and S N bond cleavage. We also determined that solution pH, humic acid, and inorganic ions had varying effects on the photocatalytic degradation capability of Bi-Ti/PAC-2-700. We measured the efficiency of Bi-Ti/PAC-2-700 for SMT degradation in natural river and lake water and found it to be >85 %, sufficient for practical applications. This study provides a green and efficient photocatalyst that can be applied to water treatment processes.
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
FUEL
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2025
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IF 7.5
Sheng-Zhe Zhao,Rui-Dong Shi,Guo-Tao Xiang,Yong-Da Hu,Jin-Ju Chen
The system of photocatalytic fuel cells (PFC) emerges as a significant innovation within the realm of energy conversion technologies, harnessing the potential of organic waste to produce electrical energy. In this study, we propose a novel approach for simultaneous electricity production and pollutant removal using a PFC system, which consists of Bi 2 O 3 /TiO 2 heterojunction nanotubes modified by g-C 3 N 4 as photoanode materials. The g-C 3 N 4 /Bi 2 O 3 /TiO 2 (CBT) heterostructure possesses a large specific surface area, improved visible light absorption, and enhanced photogenerated carrier separation capability. The morphology, composition, crystal structure, and optical properties of the synthesized CTB were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV–Vis diffuse reflectance spectroscopy (DRS). Using tetracycline hydrochloride as the target pollutant, the photocatalytic degradation performance of the CBT heterostructure is 3.2 times higher than that of pure TiO 2 nanotubes. Furthermore, the PFC system consisting of CBT as photoanode has a significant improvement in pollutant degradation and current output when compared with the PFC with pure TiO 2 . This study presents a cost-effective approach for organic waste treatment and simultaneous electricity production.
研究领域:
环境科学
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能源材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 2
·2146-2157
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IF 2.478
Zhong Chengwei,Wei Wei,He Huan,Huangfu Zhuoxi,Wang YiZheng,Yu Jiang
Heterojunction photocatalytic materials have received extensive attention by the researchers. In this work, g-C 3 N 4 /Bi 2 O 3 /TiO 2 (TCB) composites with g-C 3 N 4 as the main body were synthesized via microwave-assisted ball milling and the heat treatment method. The photocatalytic activity was evaluated by the degradation efficiency of rhodamine B (RhB) and methylene blue (MB) under visible or UV light irradiation. TCB with a mass ratio of melamine/TiO 2 /Bi(NO) 3 ·5H 2 O of 30:1:0.25 has the best photocatalytic performance when fabricated at 450 °C in open air, and the degradation efficiency of the as-prepared material to RhB was 48.07% under visible light and 51.18% to MB under UV. The results of morphological structure analysis revealed that there was a flocculent structure on the edge of the g-C 3 N 4 film and the phase of TiO 2 and Bi 2 O 3 changed. The presence of β-Bi 2 O 3 enhanced photocatalytic efficiency of the as-prepared materials. The optical properties analysis confirmed that the structure of the hybrid samples can promote electron–hole pairs separately at multilayer heterogeneous interfaces and the electron can react with O 2 to yield the · \({O}_{2}^{-}\) radical. In summary, the ability of novel spatial structure materials to absorb visible light is enhanced, which are facilitated for photocatalytic activity and have excellent stability. Therefore, the study of ternary heterojunction photocatalytic materials provides a reference for environmental remediation.
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
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Quan Zou,Hu Li,Yuping Yang,Yingchun Miao,Yuning Huo
A novel photocatalytic reactor was designed for the photo-degradation of organic pollutants with floated glass balls on the solution surface, which were constantly rotated by the air pumping and coated with Bi 2 O 3 /TiO 2 film. The uniform and stable Bi 2 O 3 /TiO 2 film was prepared by the facile sol-gel method at the optimal conditions of Bi Bi 2 O 3 content (1.0 mol%) and the three coating times with the film thickness of 210 nm. It was uniformly distributed and stably combined with the surface of the glass ball. Modification of Bi 2 O 3 significantly improved the visible light absorption of TiO 2 film and inhibited the photo-induced charges, promoting the photo-degradation activity. More importantly, the air pumping at the bottom of the reactor impelled the constant rotation of floated glass balls. It could realize the uniform aqueous membrane on the catalyst film to improve the efficient contact between catalyst and organics and to utilize the irradiation light efficiently, inhibiting the light shield effect of dyeing wastewater and facilitating the photo-degradation. Moreover, the Bi 2 O 3 /TiO 2 photocatalytic film in this photocatalytic reactor exhibited high durability and prevented the leakage of catalyst, providing a potential for the practical applications in the future.
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
DOI
高影响因子
危险品化学品经营许可证（带存储）