液相重金属汞离子吸附和光催化净化研究

Study on Adsorption and Photocatalytic Purification of Heavy Metal Mercury Ion in Aqueous Solution

为实现废水中重金属汞离子污染物吸附和光催化高效净化,研究以溶胶凝胶与模板合成法,制备蒙脱石(MMt)负载TiO_(2)催化剂(TiO_(2)/MMt),研究了不同温度液相重金属汞离子吸附和光催化还原净化,结果表明,该催化剂对重金属汞离子具有较好的吸附和光催化还原净化性能,随温度升高,吸附容量下降,光催化还原净化量提高,Elovich等式能较好的表达吸附动力学过程,Langmuir平衡模型能描述不同温度、不同浓度重金属汞离子吸附等温平衡,获得了吸附平衡模型参数,基于浓度时间指数模型关系,计算了光催化还原净化动力学表观活化能和指前因子。

In order to realize the efficient purification of heavy metal mercury ions in wastewater by adsorption and photocatalytic methods,the montmorillonite(MMT)supported TiO_(2)(TiO_(2)/MMT)was prepared by sol-gel and template synthesis methods.The adsorption and photocatalytic reduction purification of heavy metal mercury in aqueous solutions at different temperatures were studied.The results showed that the catalyst presented good adsorption and photocatalytic reduction purification performance for heavy metal mercury ions.With the increase of temperature,the adsorption capacity decreased,and the photocatalytic reduction purification amount increased,the Elovich equation can better express the adsorption kinetic process,and Langmuir equilibrium model described well the adsorption isotherm equilibrium of heavy metal mercury ions at different temperatures and concentrations,and model parameters were obtained.The apparent activation energy and pre-exponential factor of photocatalytic reduction purification are calculated by using concentration and time model.