A mini-review of ferrites-based photocatalyst on application of hydrogen production
《能源前沿（英文）》
2021年
第15卷
第3期
页码 621-630
doi:
10.1007/s11708-021-0761-0
摘要：
Photocatalytic water splitting for hydrogen production is a promising strategy to produce renewable energy and decrease production cost. Spinel-ferrites are potential photocatalysts in photocatalytic reaction system due to their room temperature magnetization, the high thermal and chemical stability, narrow bandgap with broader visible light absorption, and proper conduction band energy level with strong oxidation activity for water or organic compounds. However, the fast recombination of the photoexcited electrons and holes is a critical drawback of ferrites. Therefore, the features of crystallinity, particle size, specific surface area, morphology, and band energy structure have been summarized and investigated to solve this issue. Moreover, composites construction with ferrites and the popular support of TiO2 or g-C3N4 are also summarized to illustrate the advanced improvement in photocatalytic hydrogen production. It has been shown that ferrites could induce the formation of metal ions impurity energy levels in TiO2, and the strong oxidation activity of ferrites could accelerate the oxidation reaction kinetics in both TiO2/ferrites and g-C3N4/ferrites systems. Furthermore, two representative reports of CaFe2O4/MgFe2O4 composite and ZnFe2O4/CdS composite are used to show the efficient heterojunction in a ferrite/ferrite composite and the ability of resistance to photo-corrosion, respectively.
关键词：
photocatalyst
spinel-ferrite
composite
photocatalytic hydrogen production
Photocatalytic water splitting of ternary graphene-like photocatalyst for the photocatalytic hydrogen
Yan Zhang, Yuyan Zhang, Xue Li, Xiaohan Zhao, Cosmos Anning, John Crittenden, Xianjun Lyu
《环境科学与工程前沿（英文）》
2020年
第14卷
第4期
doi:
10.1007/s11783-020-1248-7
摘要：
Abstract •The MoS2/SiC/GO composite has a strong photocatalytic activity than SiC. •The optimal catalyst yielded the highest quantum of 21.69%. •GO acts as a bridge for electron passage in photocatalytic reaction. In recent times, therehas been an increasing demand for energy which has resulted in an increased consumption of fossil fuels thereby posing a number of challenges to the environment. In the course finding possible solutions to this environmental canker, solar photocatalytic water splitting to produce hydrogengas has been identified as one of the most promising methods for generating renewable energy. To retard the recombination of photogenerated carriers and improve the efficiencyof photocatalysis, the present paper reports a facile method called the hydrothermal method, which was used to prepare ternary graphene-like photocatalyst. A “Design Expert” was used to investigate the influence of the loading weight of Mo and GO as well as the temperature of hydrothermal reaction and their interactions on the evolution of hydrogen (H2) in 4 h. The experimental results showed that the ternary graphene-like photocatalyst has a strong photocatalytic hydrogen production activity compared to that of pure SiC. In particular, the catalyst added 2.5 wt% of GO weight yielded the highest quantum of 21.69 % at 400–700 nm of wavelength. The optimal evolution H2 in 4 h conditions wasobtained as follows: The loading weight of Mo was 8.19 wt%, the loading weight of GO was 2.02 wt%, the temperature of the hydrothermal reaction was 200.93°C. Under the optimum conditions, the evolution of H2 in 4 h could reach 4.2030 mL.
关键词：
Water splitting
Visible light
Graphene-like photocatalyst
Response surface methodology
Hexavalent chromium in drinking water: Chemistry, challenges and future outlook on Sn(II)- and photocatalyst-based
Haizhou Liu, Xuejun Yu
《环境科学与工程前沿（英文）》
2020年
第14卷
第5期
doi:
10.1007/s11783-020-1267-4
摘要：
Abstract • Wide occurrence of Cr(VI) in US source drinking water. • A strong dependence of occurrence on groundwater sources. • Elucidate Redox and equilibrium chemistry of Cr(VI). • Sn(II)-based and TiO2-based reductive treatments hold extreme promise. • Key challenges include residual waste, Cr(VI) re-generation and socioeconomic drivers. Chromium (Cr) typically exists in either trivalent and hexavalent oxidation states in drinking water, i.e., Cr(III) and Cr(VI), with Cr(VI) of particular concern in recent years due to its high toxicity and new regulatory standards. This Account presented a critical analysis of the sources and occurrence of Cr(VI) in drinking water in the United States, analyzed the equilibrium chemistry of Cr(VI) species, summarized important redox reaction relevant to the fate of Cr(VI) in drinking water, and critically reviewed emerging Cr(VI) treatment technologies. There is a wide occurrence of Cr(VI) in US source drinking water, with a strong dependence on groundwater sources, mainly due to naturally weathering of chromium-containing aquifers. Challenges regarding traditional Cr(VI) treatment include chemical cost, generation of secondary waste and inadvertent re-generation of Cr(VI) after treatment. To overcome these challenges, reductive Cr(VI) treatment technologies based on the application of stannous tin or electron-releasing titanium dioxide photocatalyst hold extreme promise in the future. To moving forward in the right direction, three key questions need further exploration for the technology implementation, including effective management of residual waste, minimizing the risks of Cr(VI) re-occurrence downstream of drinking water treatment plant, and promote the socioeconomic drivers for Cr(VI) control in the future.
关键词：
Chromium
Chemistry
Treatment
Future outlook
Preparation of TiO
Shenghung WANG, Kuohua WANG, Jihmirn JEHNG, Lichen LIU
《环境科学与工程前沿（英文）》
2012年
第6卷
第3期
页码 304-312
doi:
10.1007/s11783-010-0297-8
摘要：
Titanium dioxide is coated on the surface of MCM-41 wafer through the plasma enhanced chemical vapor deposition (PECVD) method using titanium isopropoxide (TTIP) as a precursor. Annealing temperature is a key factor affecting crystal phase of titanium dioxide. It will transform an amorphous structure to a polycrystalline structure by increasing temperature. The optimum anatase phase of TiO which can acquire the best methanol conversion under UV-light irradiation is obtained under an annealing temperature of 700°C for 2 h, substrate temperature of 500°C, 70 mL·min of oxygen flow rate, and 100 W of plasma power. In addition, the films are composed of an anatase-rutile mixed phase, and the ratio of anatase to rutile varies with substrate temperature and oxygen flow rate. The particle sizes of titanium dioxide are between 30.3 nm and 59.9 nm by the calculation of Scherrer equation. Under the reaction conditions of 116.8 mg·L methanol, 2.9 mg·L moisture, and 75°C of reaction temperature, the best conversion of methanol with UV-light is 48.2% by using the anatase-rutile (91.3/8.7) mixed phase TiO in a batch reactor for 60 min. While under fluorescent light irradiation, the best photoactivity appears by using the anatase-rutile (55.4/44.6) mixed phase TiO with a conversion of 40.0%.
关键词：
photocatalyst
titanium dioxide
MCM-41
plasma enhanced chemical vapor deposition (PECVD)
Bioinspired C/TiO
Jian LI, Likun GAO, Wentao GAN
《农业科学与工程前沿（英文）》
2017年
第4卷
第4期
页码 459-464
doi:
10.15302/J-FASE-2017178
摘要：
butterfly wings were replicated by a sol-gel method and a calcination process, which could take advantage of the spatial features of the wing to enhance their photocatalytic properties. Hierarchical structures of -carbon-TiO (PP-C-TiO ) were confirmed by SEM observations. By applying the Brunauer-Emmett-Teller method, it was concluded that in the presence of wings the product shows higher surface area with respect to the pure TiO made in the absence of the wings. The higher specific surface area is also beneficial for the improvement of photocatalytic property. Furthermore, the conduction and valence bands of the PP-C-TiO are more negative than the corresponding bands of pure TiO , allowing the electrons to migrate from the valence band to the conduction band upon absorbing visible light. That is, the presence of C originating from wings in the PP-C-TiO could extend the photoresponsiveness to visible light. This strategy provides a simple method to fabricate a high-performance photocatalyst, which enables the simultaneous control of the morphology and carbon element doping.
关键词：
bioinspired
butterfly wings
C/TiO2
photocatalyst
visible light
标题
作者
时间
类型
操作
A mini-review of ferrites-based photocatalyst on application of hydrogen production
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One-pot hydrothermal fabrication of BiVO/FeO/rGO composite photocatalyst for the simulated solar light-driven
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Xuejiao Wang, Xiang Feng, Jing Shang
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Efficient flower-like ZnSe/CuZnS photocatalyst for hydrogen production application
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All-inorganic TiO/CsAgBiBr composite as highly efficient photocatalyst under visible light irradiation
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A simple and cheap method for preparation of coupled ZrO2/ZnO with high photocatalytic activities
WANG Zheng, ZHANG Bingru, LI Fengting
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Visible-light-driven heterostructured g-CN/Bi-TiO floating photocatalyst with enhanced charge carrier
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Photocatalytic water splitting of ternary graphene-like photocatalyst for the photocatalytic hydrogen
Yan Zhang, Yuyan Zhang, Xue Li, Xiaohan Zhao, Cosmos Anning, John Crittenden, Xianjun Lyu
期刊论文
Hexavalent chromium in drinking water: Chemistry, challenges and future outlook on Sn(II)- and photocatalyst-based
Haizhou Liu, Xuejun Yu
期刊论文
Property-performance relationship of core-shell structured black TiO photocatalyst for environmental
期刊论文
Preparation of TiO
Shenghung WANG, Kuohua WANG, Jihmirn JEHNG, Lichen LIU
期刊论文
Modern developments related to nanotechnology and nanoengineering of concrete
Konstantin SOBOLEV
期刊论文
Bioinspired C/TiO
Jian LI, Likun GAO, Wentao GAN
期刊论文
Utilizing transparent and conductive SnO
Jing Gu, Hongtao Yu, Xie Quan, Shuo Chen, Junfeng Niu
期刊论文
Visible light responsive photocatalysts developed by substitution with metal cations aiming at artificial photosynthesis
期刊论文
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