JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2012
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IF 2.421
Z.L. Zhang,M. Wan,Y.L. Mao
A TiO 2 -based composite, ZnFe 2 O 4 /TiO 2 , was prepared with a commercial TiO 2 (Degussa P25) and ZnFe 2 O 4 nanopowders using a simple method. The composite was characterized by X-ray diffraction (XRD), UV–vis absorption spectrum, surface photovoltage spectroscopy (SPS) and SEM. The composite presents an enhanced photovoltaic effect compared with the pure TiO 2 . The trap distributions of TiO 2 and ZnFe 2 O 4 /TiO 2 composite were investigated and the energy levels of TiO 2 and ZnFe 2 O 4 were analyzed. The results indicate that the enhancement of photovoltaic effect is mainly due to the increase of photo-generated carrier concentration and improvement of the separation efficiency of photo-generated carriers by the addition of ZnFe 2 O 4 .
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
Science of Advanced Materials
·
2015
·Vol. 7
·期 2
·295-300
·
IF 2.598
Liang Peng,Zhang Lin,Zhao Xiaoliang,Li Jianjiang,Liu Long,Cai Rongsheng,Yang Dongjiang,Umar Ahmad
It is an efficient strategy to extend the light response range of TiO2-based photocatalysts to visible light region by constructing heterojunctions with the low bandgap semiconductors. The bandgap edge match between the low bandgap semiconductors and the TiO2 substrate
is believed to a key to sensitize the TiO2-based photocatalysts. In this study, TiO2 (anatase) nanofibers were modified by ZnFe2O4 nanoparticles from ZnO colloid. The ZnFe2O4 nanoparticles with a relatively narrow band gap of
1.90 eV and the conduction band edge at –1.54 eV (vs NHE) which is more negative than that of TiO2. So as expected, the ZnFe2O4 particles extended the photoresponse of TiO2 (anatase) nanofibers into the visible light region and enhanced the
photoresponse of UV light. The photogenerated electron–hole separation in ZnFe2O4/TiO2 (anatase) composite nanofibers is responsible for the rapidly increased photocurrent under the visible light and UV light irradiation.
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
Coatings
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2022
·Vol. 12
·期 10
·1407
·
IF 3.236
Renhua Chen,Suying Ding,Bo Wang,Xuechang Ren
ZnFe2O4microspheres were prepared by solvothermal method, and a novel ZnFe2O4@TiO2core-shell composite photocatalyst was prepared by ultrasonic (denoted as ZT-x) and mechanical stirring (denoted as ZTM-1.2). The morphology, structure, magnetic, and optoelectronic properties of the catalyst were investigated comprehensively, and the degradation performance of the catalyst was explored through the photocatalytic degradation of Rhodamine B (RhB) under UV light. The concentration of RhB was 10 mg/L, and the catalyst concentration was 0.3 g/L. ZT-1.2 showed the best photocatalytic degradation activity, and the degradation rate of RhB reached 97.3% within 60 min. The degradation ability of the catalyst was further evaluated by Methylene blue (MB), Methyl orange (MO), Phenol, and Ofloxacin (OFX). ZT-1.2 also exhibited excellent stability. The improved catalyst degradation performance was attributed to constructing a Z-type heterojunction. Moreover, the low-efficiency degradation of ZTM-1.2 was caused by catalyst agglomeration and low TiO2loading, confirming the superiority of the ultrasonic method and providing a new method for the preparation of magnetically recoverable TiO2-based core-shell photocatalyst.Keywords:ZnFe2O4@TiO2;ultrasonic;nanocomposites;photocatalysis
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
·
IF 2.625
Yida Lu,Yiping Feng,Fengliang Wang,Xuegang Zou,Zhi-Feng Chen,Ping Chen,Haijin Liu,Yuehan Su,Qianxin Zhang,Guoguang Liu
In this study, a novel and highly efficient ternary photocatalytic ZnFe 2 O 4 /TiO 2 /CDs nanocomposite was successfully synthesized by a hydrothermal method. The properties and structures of the samples were characterized by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared spectrometry (FT-IR), and photoluminescence spectrum (PL). The UV–vis diffuse reflectance spectrum was used to demonstrate that carbon quantum dots could increase the absorption of visible light wavelengths. When compared with TiO 2 /3.00 wt%CDs and ZnFe 2 O 4 /TiO 2 nanocomposites, the ternary photocatalysts exhibited the enhanced photocatalytic activity under solar-spectrum irradiation. A low CDs content of 3.00 wt% in the ternary photocatalysts possessed excellent performance in the decomposition of Rhodamine B (RhB). Act as donator and receiver, CDs can efficiently improve the ability of electron transfer and separate the electron-hole pairs. OH and O 2 − were confirmed to be involved in the photocatalytic degradation of RhB base on the Electron spin resonance (ESR) tests, and the photocatalytic mechanism of the ZnFe 2 O 4 /TiO 2 /3.00 wt%CDs was proposed. After four sequential operational cycles, the ZnFe 2 O 4 /TiO 2 /CDs maintained its photocatalytic efficiency, indicating its high photocatalytic stability. Therefore, our results provide a high efficient photocatalytic nanocomposite that synthetized by a facile method, and have implications in the removal of environmental persistent pollutants under ternary photocatalysts mediated solar degradation
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Jiayi Li,Ying Huang,Minhua Su,Yuying Xie,Diyun Chen
Heterocyclic aromatic compounds such as malachite green can cause immense harm to the environment and mankind because of their toxic bio-accumulation and insufficient biodegradation. ZnFe 2 O 4 /TiO 2 (ZF-T) has attracted attentions as a visible-light-driven catalyst because it can break and mineralize benzene through photolysis. Compared with TiO 2 , which photodegrades only 53.5% malachite green, anatase TiO 2 loaded with ZnFe 2 O 4 has greater photocatalytic activity and can degrade up to 90.1% malachite green. Furthermore, a photocatalytic efficiency above 80% can be obtained through five consecutive cycles with a duration of 4 h. In this study, ZF-T was characterized, and its photolytic parameters, including dosage, pH, time, and ionic strength, were optimized. The photolytic products of malachite green were analyzed by ultraviolet–visible spectroscopy and liquid chromatography-mass spectrometry, which confirmed that ZF-T can drive visible light to produce •O 2 − and H + free radicals that can efficiently degrade heterocyclic aromatic hydrocarbons and cleave benzene rings. These outcomes deepen our understanding of the development and applications of visible-light-driven ZF-T composites in the field of wastewater purification.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Fan Sun,Xueli Xing,Chunyang Zhang,Jinrui Zhang,Hui Hong
Photocatalytic CO2 reduction with naturally abundant H2O as the proton source has attracted widespread concern for its environmental and sustainable advantages. Nevertheless, the high recombination rate of photogenerated electron–hole pairs leads to unsatisfactory solar-to-chemical energy conversion efficiency. In this work, we proposed and validated a strategy that photothermal–magnetic synergistically promotes the separation of photogenerated carriers, as well as their transport, leading to boosted photocatalytic performance. A paramagnetic Z-scheme ZnFe2O4/TiO2 heterojunction was fabricated, and its performance in CO2 reduction was examined under concentrated full-spectrum light illumination with an applied external magnetic field. The built-in electric field of the Z-scheme heterojunction improved the dynamic properties of electron–hole pairs. At the same time, the thermal effect induced by infrared light played a crucial role in promoting CO2 conversion. Importantly, the applied external magnetic field further suppressed the recombination of charge carriers via Lorentz force, magnetoresistance, and spin-polarization effects. As a result, the assistance of a magnetic field significantly increased the yields of CO, CH4, and H2 in comparison to the absence of a magnetic field, with maximum enhancements of 25.3, 29.6, and 62.9%, respectively. Moreover, the excessive heating due to the higher concentrated ratio may induce magnetic disorder within the material, potentially reducing the magnetic field’s ability to facilitate carrier transport. The photothermal–magnetic synergy mechanism was systematically explored. Our work has presented a new approach in which photothermal–magnetic effects synergistically contribute to solar fuel production.
研究领域:
材料科学
·
化学工程
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
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