摘要
TiO_2因其活性高、价格低廉、性质稳定等特点已成为环境净化开发应用方面最有价值的光催化材料之一。但由于TiO_2光谱响应范围窄,只能利用紫外光,对太阳能的有效利用率低。因此,需要改变反应条件以拓宽光响应范围和增强其光催化性能。论文以甲基橙为目标降解物,研究在紫外光和可见光下的反应体系中,添加Br O3-的阴离子对TiO_2光催化性能的影响。结果表明:在紫外光和可见光下,当溶液初始p H为3、TiO_2投加量为2.0g/L,添加Br O3-浓度为6mmol/L时,对TiO_2光催化降解甲基橙都有促进效果,反应速率增大,反应时间缩短。且在可见光下,未添加Br O3-时TiO_2光催化降解甲基橙的降解率仅为20%;添加Br O3-后降解速率提高50倍以上,反应进行至35min时甲基橙可以完全降解。
TiO2 is one of the most valuable photocatalytic materials of current environment purifica-tion because of its high activity, low cost, and great stability. However, the spectral response range of TiO2 is narrow. TiO2 can only utilize ultraviolet （ UV） light, resulting in low solar energy utiliza-tion efficiency. Hence, in order to broaden its photo-responsive range and improve its photocatalytic performance, reaction conditions should be optimized. In this study, the effects of adding BrO3- on the photodegradation of methyl orange with TiO2 as the photocatalyst were explored under both UV light and visible light conditions. Results indicated that methyl orange degradation rate was en-hanced and the reaction time was shorten under the condition of pH=3, TiO2 dosage of 2 g/L, and BrO3- addition amount of 6 mmol/L under UV light and visible light irradiation. Besides, under vis-ible light irradiation, methyl orange was completely degraded within 30 min with the addition of BrO3-, and the corresponding degradation rate was improved for more than 50 times, as compared with the case without BrO3-, which degradation efficiency was only 20%.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2016年第5期1662-1666,共5页
Journal of Guangxi University（Natural Science Edition）
基金
广西自然科学基金资助项目(2013GXNSFAA019312)
广西大学广西高校环境保护重点实验室(XGL090020)
