Effects of double roller treatment on physicochemical and adsorption properties of attapulgite clay

Attapulgite clay was treated by double roller for 1~5 times,respectively,and the effect of rolling times on the micro-structure and physicochemical properties of attapulgite clay was investigated through infrared spectroscopy,scanning electronic microscopy,specific surface area and ζ potential techniques.On this basis,the adsorption properties of the double rolled attapulgite clay for diclofenac sodium were evaluated.The results showed that the aggregation of attapulgite clay was basically dissociated,and the increasing trends of specific surface area becomes weaker,and the lowest ζ potential value in distilled water was observed,after rolling for 2 times.The attapulgite clay rolling for 5 times has the greatest specific surface area,but the lowest adsorption capacities for diclofenac sodium.This indicates that the adsorption capacities of attapulgite clay were not only related to its specific surface area,but also to its surface charges as well as the polarities of the adsorbed substance.