杂多酸型光催化剂降解染料的研究进展
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摘要
如何有效地去除废水中的染料一直是材料和环境科学的热门方向。对比传统的吸附法、浓缩过滤法等,光催化降解染料技术由于其特有的环保性、简便性、安全性和无二次污染性等优点引起了更广泛的关注。众多光催化剂中,杂多酸因特殊的"笼形"结构、可"调谐"的电子性质、无毒性、富氧表面、价廉、出色的氧化还原能力等特点而具有巨大应用潜力。本文介绍了最近几年的杂多酸型光催化的研究进展,按方法将它们归类为改性法和负载法,并又细分它们为取代型杂多酸、改变反荷离子型杂多酸、有机无机改性法、硅酸盐负载法、二氧化钛负载法和石墨烯负载法。主要改进方向是提高杂多酸的水溶性、拓宽光吸收活性、增大比表面积、提高回收性等。对不同催化剂体系下的合成条件、催化机理等进行总结与分析,并展望了未来的发展趋势。
How to effectively remove the dyes from the waste water has been the popular direction of materials and environmental science. Compared with traditional adsorption and concentration filtration methods, the photocatalytic degradation has attracted more attention due to its unique environmental-friendly,conveniency,safety and without secondary pollution. In numerous catalysts,heteropoly acid( HPA) has great potential in photocatalytic applications due to its special ‘cage'structure,tunable electronic properties,non-toxicity,oxygen-rich surface,cheapness and excellent redox properties, etc. In this paper, the research progress of polyoxometalate-based photocatalysts in recent years was introduced,and they can be classified into two major categories: modification and loading method,which were further subdivided into substitution HPAs,altered counterion HPA,organic and inorganic modification method,silicate loading method,titanium dioxide loading method and graphene loading method. The main improvement direction is to resolve their water solubility problem,broaden the light response range,increase their specific surface area and improve the recyclability. The synthesis conditions and catalytic mechanism of different catalyst systems were summarized and analyzed in detail,at the end,the future development trend is forecasted.
How to effectively remove the dyes from the waste water has been the popular direction of materials and environmental science. Compared with traditional adsorption and concentration filtration methods, the photocatalytic degradation has attracted more attention due to its unique environmental-friendly,conveniency,safety and without secondary pollution. In numerous catalysts,heteropoly acid( HPA) has great potential in photocatalytic applications due to its special ‘cage'structure,tunable electronic properties,non-toxicity,oxygen-rich surface,cheapness and excellent redox properties, etc. In this paper, the research progress of polyoxometalate-based photocatalysts in recent years was introduced,and they can be classified into two major categories: modification and loading method,which were further subdivided into substitution HPAs,altered counterion HPA,organic and inorganic modification method,silicate loading method,titanium dioxide loading method and graphene loading method. The main improvement direction is to resolve their water solubility problem,broaden the light response range,increase their specific surface area and improve the recyclability. The synthesis conditions and catalytic mechanism of different catalyst systems were summarized and analyzed in detail,at the end,the future development trend is forecasted.
引文
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