改性凹凸棒土对罗丹明B的吸附研究

Study on the Adsorption of Rhodamine B by Acid-activated Attapulgite

通过酸活化的方法对凹凸棒土进行改性,并以其为吸附剂,通过静态吸附实验考察了其对罗丹明B的吸附性能。结果表明,酸活化能够提高凹凸棒土的比表面积,进而提高其对罗丹明B的吸附性能。在酸活化凹凸棒土投加量为4 g/L、吸附时间为40min的条件下吸附50mg/L的罗丹明B,罗丹明B的去除率可达92.1%。伪二级动力学和Freundlich等温吸附模型能够很好地描述罗丹明B在改性凹凸棒土上的吸附。

The attapulgite is activated by acid solution to obtain the acid-activated attapulgite adsorbent.The adsorption performance of acid-ac-tivated attapulgite to adsorb rhodamine B is investigated by static adsorption experiments.The experimental results show that the surface area of atta-pulgite can be improved by acid treatment,and then the capacity of adsorbing rhodamine B is enhanced.The removal rate of rhodamine B can reach92.1% when the acid-activated attapulgite dosage is 4g/L,the initial concentration of rhodamine B is 50mg/L,and the adsorption time is 40min.The adsorption process of acid-activated attapulgite for rhodamine B can be described with pseudo-second-order kinetics model and the Freundlich ad-sorption isotherm model.