TiO_2纳米管阵列在环境领域的研究进展

Research Advances of TiO_2 Nanotube Array in Environmental Field

TiO2纳米管阵列是一种新型的无机功能材料,具有化学惰性、气敏、介电效应、良好的生物兼容性、较强的光催化能力以及抗化学腐蚀和光腐蚀的能力,特别是具有很好的光催化活性,使其在太阳能的储存与利用、环境净化、催化剂、光催化降解环境污染物等方面有比较多的研究应用.TiO2纳米管阵列通过一定的修饰可以使其吸收光谱向可见光区迁移,同时它兼具成本低廉、环境友好等优点,是当前环境污染物削减与监控的重要研究方向之一.本文主要对近年来国内外TiO2纳米管阵列作为光催化剂降解环境污染物和作为功能材料在环境分析检测中的应用进行简要综述,为开发新型污染物监控与处理技术及拓展TiO2纳米管阵列的潜能提供重要参考.

TiO2 nanotube array is a novel inorganic functional material,its unique chemical and physical properties such as chemical inertness,gas sensitivity,dielectric effect,biocompatibility,better photocatalytic activity and resistance to chemical and light attacks,especially excellent photocatalytic activity,which resulted in many researches and applications in various fields such as storage and utilization of solar energy,environmental clean,catalyst,and photocatalytic degradation of pollutants.TiO2 nanotube array has been successfully used as photoanodes to transfer solar energy to electric energy,which provides a new way to our energy supply.As a highly efficient catalyst,TiO2 nanotube array has also transferred macromolecules such as dyes and other persistent pollutants into small molecules like CO2 and H2O,which will play an important role in the reduction of pollutants in environment.Meanwhile it can transfer CO2 to hydrocarbons by reduction reaction which cuts down not only the amounts of CO2 in atmosphere but also hydrocarbon fuel gases like CH4 that speed up carbon cycle,and further decrease the greenhouse effects.As a special functional material,it has been proved to be used in monitoring COD value and pollutants in environmental mediums based on its electrochemical properties,and also enriching pollutants at trace or ultratrace levels.Moreover,doping or modification will lead to the migration of the absorption spectra of the TiO2 nanotube array to visible region,and enhance the effective use of solar energy.Due to the advantages of low cost and environmental friendliness,more attention has been put on TiO2 nanotube arrays for the reduction and monitoring of environmental pollutants.This review focused on the photocatalytic degradation of pollutants and applications in environmental analytical chemistry of TiO2 nanotube arrays in recent years,and provided a reference for developing new techniques for treatment and monitoring of pollutants and widened the potential of TiO2 nanotube arrays.