功能化Cu_(2)O光催化研究进展

Research progress of functionalized Cu_(2)O photocatalysis

光催化技术是利用太阳能解决能源短缺和环境污染等问题的有效方法之一.因此,开发一种具有高效光催化活性的光催化材料具有重要意义.Cu_(2)O是一种窄带隙的P型半导体材料,因其成本低、制备方法简单以及高可见光活性被广泛应用于光催化、传感和储能材料等领域.本文主要结合氧化亚铜光催化机理概述了功能化氧化亚铜光催化性能研究进展,介绍了杂原子掺杂、贵金属负载、半导体复合、碳材料复合以及三元复合材料等改性方法,最后对氧化亚铜基光催化材料的应用前景做出了展望.

With the development of industrialization and the extensive use of fossil fuels,energy shortage and environmental pollution have become hot issues to be solved,such as water pollution,air pollution,energy depletion and greenhouse effect.In order to solve the serious energy and environmental crisis,people have to develop new renewable and sustainable energy,and photocatalytic technology is one of the effective ways to solve the problems by using solar energy.Photocatalytic technology can use sunlight to degrade organic pollutants,decompose hydrogen in aquatic products and reduce carbon dioxide in the atmosphere to other useful fuels.Therefore,it is of great significance to develop a kind of photocatalytic material with high photocatalytic activity.Cu_(2)O is a kind of P-type semiconductor material with narrow band gap of 1.8~2.2 eV.Owing to its low cost,simple preparation method and high visible light activity,Cu_(2)O is widely used in the fields of photocatalysis,sensing and energy storage materials.Because of its narrow band gap,more photogenerated electrons are generated.On the other hand,Cu_(2)O[111]crystal surface is rich in unsaturated Cu,which has suspended bonds and can be firmly combined with other metal oxides,thus it has been a hot spot in the research of photocatalysis.However,the rapid recombination of photo induced electron hole pairs and the instability of Cu_(2)O under light irradiation severely limit its photocatalytic performance.In order to solve the above problems,researchers use different modification methods,such as loading precious metals(Au,Ag,Pt,etc.),and constructing heterojunction with wide band gap semiconductors(WO;,ZnO and TiO;).Based on the photocatalytic mechanism of cuprous oxide,this paper summarizes the research progress of the photocatalytic performance of functional cuprous oxide,and introduces the modification methods of heteroatom doping,noble metal loading,semiconductor composite,carbon composite and ternary composite.Cuprous oxide based composite nanostructures can display excellent photocatalytic performance,which are generated by the interaction between different components and the synergistic effect.For example,the local surface plasmon resonance effect of noble metals can broaden the absorption wavelength of photocatalyst and can form Schottky barrier with Cu_(2)O,semiconductor oxides can form heterostructure with Cu_(2)O,adjust the energy band structure of materials,effectively separate electron holes,and improve the charge transfer rate.Finally,the application prospect of cuprous oxide photocatalyst was prospected,and some problems in its application were pointed out,such as the recycling of materials,how to preferentially dope Cu_(2)O,preferentially construct heterojunction and the stability of constructed structure.