Author/Authors :
Liu, Yun Sichuan University - Institute of Materials Science and Technology, Analytical and Testing Center, China , Luo, Ling Sichuan University - Institute of Materials Science and Technology, Analytical and Testing Center, China , Chen, Guanglei Sichuan University - Institute of Materials Science and Technology, Analytical and Testing Center, China , Xie, Meiju Sichuan University - Institute of Materials Science and Technology, Analytical and Testing Center, China , Yu, Zili Sichuan University - Institute of Materials Science and Technology, Analytical and Testing Center, China
Abstract :
The surface modification of ground tyre rubber (GTR) containing hydroxyl groups was carried out by atom transfer radical polymerization using a two-step reaction procedure. The process consisted of immobilization of an ATRP initiator such as 2-bromoisobutyryl bromide and controllable radical polymerization of maleic anhydride (MAH). The resulting GTR-g-MAH was characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results demonstrated that the graft yield of new polymer could reach 69.4% on GTR surface. Then the grafted GTR was used as an adsorbent for removal of lead ions from aqueous solution. It was observed that factors such as solution pH, contact time, initial lead concentration and graft yield exerted considerable influence on lead adsorption capacity of GTR-g-MAH. The adsorption process indicated that the pseudo-second-order kinetic model fitted the experimental data well, and the equilibrium of adsorption could be described by Freundlich isotherm model. The maximum adsorption capacity of GTR-g-MAH calculated from Langmuir isotherm reached 144 mg.g-1. It was found that the GTR-g-MAH particles had significantly greater adsorption capacity and faster adsorption kinetics for lead adsorption than unmodified GTR particles.
Keywords :
ground tyre rubber , atom transfer radical polymerization , immobilization , GTR , g , MAH , lead adsorption.
