活化赤泥吸附除磷及其机理的研究

以铝矿工业赤泥为原材料,采用酸活化、焙烧活化、热酸活化方法进行活化处理,得到除磷吸附剂,考察了pH值、反应时间和磷初始浓度等因素对除磷吸附剂吸附效果的影响.结果表明,活化赤泥具有较好的除磷能力,酸活化赤泥和焙烧活化赤泥对磷的饱和吸附量分别为155.2、144.2 mg·g-1.热酸活化赤泥除磷能力更强,其对磷的饱和吸附量可达202.9 mg·g～,经过热酸活化后的赤泥即使在pH值波动较大时也能很好处理高浓度含磷废水.溶液pH显著影响磷去除效果,在pH为7时得到最大去除量.

Phosphate removal from aqueous solutions using activated red mud

This study investigated the activated red mud used for phosphate removal from aqueous solution. Red mud was produced from the process of alumina manufacture, and was used as the raw and processed materials in preparing acid activation, heat activation and heat-acid activation sorbents. The activated sorbents were investigated in phosphate removal and the influences of various factors, such as pH, reaction time and initial phosphate concentration on the sorption capacity were also studied in batch equilibration technique. The results showed that the activation of red mud enhanced phosphate removal effectively. The phosphate monolayer capacity of the sorbent of the acid and heat treated red mud is 144.2 and 154.1 mg·g^-1 respectively. While that of the heat-acid activated red mud is 202.9 mg·g^-1, which is higher than the other sorbents. The solution pH affected the removal efficiency significantly, the activated red mud can achieve the best phosphate removal at pH 7, especially the heat-acid activated red mud had the advantages in dealing with the wastewater of high phosphate concentration over a wide rage of pH.