有机染料废水中的甲基橙、亚甲基蓝和罗丹明B等染料会对环境造成污染，影响水体生物的生存和水体质量。光催化降解技术具有反应条件温和、污染物完全矿化、高效稳定、无二次污染等特点，被认为是高效降解染料的方法之一。传统光催化剂TiO2禁带宽度大、光响应范围窄。因此，构建具有可见光响应的有效光催化剂并对其机理进行深入研究尤为重要。
近日，石河子大学化学化工学院工业催化课题组采用低温等离子体手段在Ar气氛下刻蚀TiO2得到了富缺陷的Ar-TiO2光催化剂。与TiO2相比，Ar-TiO2含有丰富的氧空位和Ti3+。这些缺陷的存在使得TiO2的禁带宽度减小，光响应范围变宽(趋于可见光)；同时在光催化过程中产生强的活性O物种(O2-·和·OH)具有优越的氧化还原性能，从而提高了光催化降解效率。在全波谱条件下，Ar-TiO2在30 min内，甲基橙降解率为99.6%是TiO2 (49%)的2倍，在120 min内，亚甲基蓝和罗丹明B的降解效率为98%和98.4%；在可见光下，150 min内，甲基橙的降解率为89%是TiO2 (23%)的近4倍，对亚甲基蓝和罗丹明B的降解效率为65%和95%。相关内容以“Enhanced photocatalytic degradation of organic dyes via defect-rich TiO2 prepared by dielectric barrier discharge plasma (DOI:10.3390/nano9050720)” 为题，在《Nanomaterials》上发表，论文第一作者硕士研究生李彦琴，通讯作者于锋副教授。
图1 等离子体处理的TiO2光催化剂. (Nanomaterials, 2019, 9(5): 720.)
以上研究工作得到了国家自然科学基金（21663022）的资助。
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