氢氧化铝吸附除磷性能及影响因素

Performance and Influencing Factors of Phosphorus Adsorption Removal by Aluminum Hydroxide

采用沉淀法,通过控制反应pH,制备不同性能的氢氧化铝,对比研究不同氢氧化铝的吸附除磷性能。结果表明,pH值为10的条件下制备的氢氧化铝具有最佳吸附除磷效果。进一步探究反应时间、反应浓度、溶液pH、温度以及共存离子对氢氧化铝吸附磷酸盐的效果影响机制。结果表明,氢氧化铝对磷酸盐的吸附符合准二级方程,且Freundlich方程的拟合结果略优于Langmuir方程。反应溶液pH及温度对氢氧化铝的吸附性能均有显著影响,酸性条件下吸附效果更好,适当提高温度有助于磷酸盐的吸附。共存阳离子对磷的吸附几乎无影响,阴离子中CO 2-3对氢氧化铝的阻碍最大,而Cl-和SO 2-4对磷的吸附影响不大,竞争效应不显著。

Precipitation method was used to prepare different properties of aluminum hydroxide by controlling pH value of the reaction.Adsorption and removal performance of phosphorus by the obtained aluminum hydroxide was investigated.Aluminum hydroxide prepared under pH value of 10 showed the optimal phosphorus removal efficiency.The study further investigated the effects of reaction time,concentration,solution pH value,temperature and coexisting ions on the adsorption of phosphate by aluminum hydroxide.Results showed that the adsorption of phosphate by aluminum hydroxide accordded with quasi-two-order equation,and fitted slightly better with Freundlich equation than Langmuir equation.The pH value and temperature of the reaction solution had a significant effect on adsorption performance of aluminum hydroxide.Adsorption efficiency was high under acidic conditions,and proper increase of temperature contributed to the adsorption of phosphorus.The anion of CO 2-3 had the greatest inhibition to aluminum hydroxide,while chloride ion and SO 2-4 had little effect on the adsorption of phosphorus,and competition effect was not significant.