SO2-4/Bi2O3固体超酸的制备及其可见光催化性能

Preparation of SO2-4/Bi2O3 Solid Superacid Catalyst and Its Visible light Photocatalysis Properties

摘要:

采用水热法结合H2SO4浸泡处理成功合成了SO^2-₄/Bi₂O₃可见光催化材料, 并采用XRD、TG DTA和UV Vis等对合成产物的物相结构、热化学性能、光吸收性能以及可见光催化性能进行了研究, 对H2SO4浸泡工艺条件对产物的可见光催化性能的影响进行了探讨。研究表明, 水热合成产物为α-Bi₂O₃、Bi₂O₄和Bi₂O₂CO₃的混合物, 其中α-Bi₂O₃为主要成分；H₂SO₄浸泡处理并未改变产物的物相结构, 但经H₂SO₄浸泡处理后产物的光催化性能得到了显著的提高, 并且H₂SO₄浸泡工艺条件对产物的光催化活性有着重要的影响。在实验范围内, 在浓度为0.5mol·L^-1的H₂SO₄溶液中浸泡75min, 再经700℃热处理4h可制备出具有较佳光催化活性的产物, 经75min可见光的照射后对甲基橙溶液的光催化脱色率可达93.1%。

Abstract:

The visible light responsive SO^2-₄/Bi₂O₃ solid superacid catalyst was prepared via combining hydrothermal technology with a H₂SO₄ dipping process. Then the crystal structures, thermal and optical properties of the as prepared samples were investigated by XRD, TG DTA and UV Vis. The effects of the concentration of H₂SO₄ solution, time of dipping treatment, and the heat treatment temperature were investigated. The results of XRD show that the as prepared samples were the mixture of α-Bi₂O₃,Bi₂O₄ and Bi₂O₂CO₃ crystals, and the H₂SO₄ dipping treatment conditions have significant influence on the photocatalytic property of the as prepared products. When the preparation conditions are chosen as: concentration of H₂SO₄of 0.5mol·L^-1, dipping time of 75min and heat treatment temperature of 700℃ for 4h, the photocatalytic decolourization ratio can reach 93.1%.