活性氧化铝对水中磷的去除与回收研究

使用活性氧化铝作为吸附剂研究其对磷的吸附特性,并对不同提取剂对磷的回收效果进行了讨论.结果表明,活性氧化铝对使用蒸馏水、自来水及洱海入湖河流罗时江水配制的磷溶液有不同的磷吸附效果,其对3种不同磷溶液的吸附等温线模型均符合Langmuir模型,经计算得到理论最大吸附量分别为20.88、32.15和29.85 mg·g-1.通过吸附试验表明,电解质的存在对吸附效果有促进作用.pH值越低,活性氧化铝表面的Zeta电位越高,越有利于磷吸附.对比使用4种不同提取剂的试验结果表明,使用0.1 mol·L-1NaOH基本可以完全提取活性氧化铝吸附的磷.

Study on Phosphate Removal and Recovery by Activated Alumina

Activated alumina was studied for removing phosphate from water, and the recovery of adsorbed phosphate on activated aluminum oxide was also tested. Phosphate solution was prepared using distilled water, tap water and Luoshijiang River water, respectively. All the phosphate adsorption tests using activated alumina were proved to be well fitted with Langmuir isotherm and the respective maximum adsorption amount were 20.88, 32.15 and 29.85 mg·g^-1, respectively. The presence of electrolyte in water could be a positive factor for phosphate removal. As the pH value of phosphate solution became lower the Zeta potential of activated alumina increased, which could enhance the phosphate removal efficiency of activated alumina. The recovery tests indicated that NaOH (0.1 mol·L^-1) solution could almost completely extract the phosphate adsorbed by activated alumina.