Search

In this paper, attapulgite microspheres were prepared by spray drying method and calcination subsequently. The effects of calcining temperature, microsphere dosage, contact time and concentration of dye on the adsorption properties of malachite green were investigated systematically. Results show that the fibrous and fold microstructure could be seen on the surface of the porous microspheres, and was mainly composed of palygorskite. The adsorption capacity of malachite green for microspheres increased firstly (500-700 °C) and then declined (800-1 000 °C ) with the calcination temperature increasing. The adsorption capacity and removal efficiency of malachite green for microspheres treated after 600 °C was 95.45 rng/g and 95.5%, respectively. The ad- sorption capacity of malachite green increased with the amount of microspheres and original concentration of the dye increasing, and the adsorption process could be described by the pseudo-second-order kinetic model. [ABSTRACT FROM AUTHOR]