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溶胶-凝胶法合成TiO2/活性炭光催化剂及联用超声技术还原铬(Ⅵ)和铜(Ⅱ)废水

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Keywords: 溶胶-凝胶法,TiO2/活性炭,超声,催化还原,铬(Ⅵ),铜(Ⅱ)

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Abstract:

以钛酸四丁酯为钛源,活性炭(AC)为载体,采用溶胶-凝胶法合成TiO2/AC复合体,利用TGA-DSC、SEM、XRD、DRS(漫反射光谱)及FTIR对复合体表面结构、光谱特征、晶体结构进行表征分析,并通过AAS(原子吸收分光光度计)测定铬(Ⅵ)、铜(Ⅱ)离子浓度以探讨超声-TiO2光催化还原去除率。研究表明:溶胶-凝胶法制备的TiO2/AC在290℃处由板钛矿型向锐钛矿型转变,500℃下焙烧催化活性最高;TiO2/AC复合体分散性能好、团聚尺寸低、比表面积大,其接触界面处有C—O—Ti键生成;经光催化动力学研究发现,光催化吸附还原机制符合一级动力学方程ln(c0/c)=kt及Langmuir-Hinshelwood吸附理论。对比无超声光催化,超声-光催化技术对铬(Ⅵ)、铜(Ⅱ)的还原去除率分别提高了39.32%和52.95%;催化剂循环使用3次后,超声-光催化还原铬(Ⅵ)、铜(Ⅱ)的去除率仍能达到70.61%和75.30%。

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