纳米SnO_(2)水热/溶剂热法改性及其光催化降解有机染料性能的综述

Review of the hydrothermal/solvothermal modification of nano-SnO_(2) and photocatalytic degradation of organic dye

从保护环境和节约能源的角度出发,光催化技术因其清洁、低耗、高效,成为解决当前水体污染问题的一项有效途径。SnO_(2)具有较大的带隙值,理论上能够产生具有更强氧化性、还原性的活性物质,有利于降解染料废水。但常规尺寸的纯相SnO_(2)带隙值较大、量子产率低、活性位点少,因此SnO_(2)光催化材料在降解染料废水方面引起了积极关注。其中水热/溶剂热法因其低成本、高晶度、易调控成为制备改性纳米SnO_(2)的方法之一,通过其制备、改性纳米SnO_(2)提升材料的比表面积、降低光生载流子复合率、减小禁带宽度以增强其降解有机染料的能力。

From the perspective of environmental protection and energy conservation,because of its cleanness,low consumption and high efficiency,photocatalytic technology has become an effective way to solve the current water pollution problem.SnO_(2) has a large band gap value,so it can produce theoretically active substances with stronger oxidizing and reducing properties,which is beneficial to the degradation of dye waste water.However,the pure phase SnO_(2) of conventional size has a large band gap,low quantum yield and few active sites.Therefore,photocatalytic materials of SnO_(2) have attracted active attention in the degradation of dye waste water.The hydrothermal/solvothermal method becomes one of the methods for preparing modified nano-SnO_(2) due to its low cost,high crystallinity and controllable.The preparation and modification of nano-SnO_(2) improved the specific surface area of the material,reduced the recombination rate of photogenerated carriers and dropped the forbidden band width to enhance its ability to degrade organic dyes.