Abstract
本文采用低饱和态共沉淀法，辅助微波手段，快速制备了具有膜片结构的十二烷基苯磺酸钠(DBS)改性的含钛层状双氢氧化物(Ti-DBS-LDHs)，并将其用于孔雀石绿(MG)的废水处理中，光催化条件下，考察了MG的初始浓度、Ti-DBS-LDHs催化剂投加量、催化剂重复利用等一系列影响因素，探索了最佳工艺。在MG的浓度50 mg•L–1、催化剂的用量是200 mg•L–1、150 W的灯照射1个小时的条件下，MG可达到完全脱色。并且Ti-DBS-LDHs可重复利用，重复使用3次，其平均脱色率为89.37%。 Ti-DBS-LDHs were fleetly prepared by the technology of the microwave-crystallization and low saturated state of coprecipitation. The purposed samples were characterized by XRD and SEM. The results show that the synthesized Ti-DBS-LDHs with the slice layer have the structure of LDHs, indicating their preparations are successful under microwave irradiation. Ti-DBS-LDHs was then applied to the decolorization of malachite green (MG). The effects of Ti/Mg molar ratio, MG concentration, catalyst dosage, dye type and circle life on the decolorization were investigated. It is shown the percentage of decolorization can reach 100% under the optimum conditions. In addition, Ti-DBS-LDHs was reusable, the average decolorization percentage of 89.37% could be obtained, the decolorization performance was stable after 3 times usage without significant loss of its decolorization activity. Therefore, Ti-DBS-LDHs is a novel and efficient photocatalyst for the decolorization of MG.
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