Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, China.
J Hazard Mater. 2010 Apr 15;176(1-3):741-8. doi: 10.1016/j.jhazmat.2009.11.098. Epub 2009 Nov 24.
Red mud (RM), a waste tailing from alumina industry, was employed with bentonite and starch as the main raw materials for producing granular adsorbents in this study. The important parameters, which greatly affect the characteristics of red mud granular adsorbents (RMGA), such as the mass ratio of three raw materials, preheating time, preheating temperature, sintering time and sintering temperature (ST), were investigated. Adsorption capacities for various RMGA were described in terms of removal of phosphate from aqueous solution according to the adsorption experiments, in which certain operation parameters (like stirring speed, reaction time, adsorbent dosage, initial pH and initial phosphate concentration) at three different aquatic temperatures (AT) were applied. The results showed that the optimum ST, under which the largest adsorption capacity was achieved for RMGA with certain RM ratio, varied with different AT in adsorption process. Based on the further characterizations of RMGA, it was speculated that the performance above was caused by the competitive interactions of chemical adsorption and physical adsorption on RMGA, since the increase in ST could lead to qualitative diversification on the surface and quantitative decrease of effective components for adsorption simultaneously.
本研究以赤泥（RM）、膨润土和淀粉为主要原料，制备出一种颗粒状吸附剂。考察了原料质量比、预热时间、预热温度、烧结时间和烧结温度（ST）等重要参数对赤泥颗粒状吸附剂（RMGA）特性的影响。根据吸附实验，用 RMGA 从水溶液中去除磷酸盐的能力来描述各种 RMGA 的吸附能力，其中在三个不同水温度（AT）下应用了某些操作参数（如搅拌速度、反应时间、吸附剂用量、初始 pH 值和初始磷酸盐浓度）。结果表明，在吸附过程中，对于具有一定 RM 比的 RMGA，达到最大吸附容量的最佳 ST 随 AT 的不同而变化。基于对 RMGA 的进一步表征，推测上述性能是由于 RMGA 上化学吸附和物理吸附的竞争相互作用所致，因为 ST 的增加会导致表面的定性多样化和吸附有效成分的定量减少。
