Abstract:Diatomite-based porous adsorption filler (DBPAF) was prepared by the addition of superfine carbon, sintered additive and binder into the diatomite through a established process in which these materials above were mixed, stirred and granulated with a particular ratio. In this paper, the effects of sintering temperature, carbon dose and diatomite particle size on the porosity characteristic of DBPAF were studied. Micro-morphology and phase composition of DBPAF were observed and analyzed by SEM and XRD. Further more, DBPAF’s maneuverability, adsorption property and relative adsorption mechanism of Pb2+ were studied by dynamic and static adsorption experiment, respectively. As the results indicated, the optimal value of sintering temperature, carbon addition and diatomite particle size were 900~1000℃, 7.0%, 2.40μm, respectively. The maneuverability of DBPAF was significantly improved compared with natural diatomite and the porosity characteristic of DBPAF, whose the main phase was cristobalite, also obtained a certain degree of improvement. The results also illustrated that the optimum rate of temperature increase should be 2-5℃/min to ensure the pores distributing uniformly in DBPAF. In other side, the adsorption capacity of DBPAF increased by 78.0% compared with natural diatomite. Elementary mechanism studies implied that the key procedure of adsorption on Pb2+ of DBPAF was the chemical reaction happened in the channels of DBPAF where Pb2+ and active groups might react mutually. Further, the kinetic mode of Pb2+ adsorption on DBPAF followed Pseudo-second-order.
朱健, 王韬远, 王平, 雷明婧, 李科林. 硅藻土基多孔吸附填料的制备及其对Pb2+的吸附[J]. 中国环境科学, 2012, 32(12): 2205-2212.
ZHU Jian, WANG Tao-Yuan, WANG Ping, LEI Ming-Jing, LI Ke-Lin. Preparation of diatomite-based porous adsorption filler and adsorption on Pb2+. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(12): 2205-2212.