石英砂负载氧化铁吸附除磷的研究

Study of phosphate adsorption on iron-oxide coated sand

通过小试摇床试验研究了石英砂负载氧化铁(IOCS)在不同的试验条件下(pH、吸附时间、背景离子等)对磷的吸附效果。结果表明:在中性条件下,IOCS吸附除磷效果最佳;锑与磷在IOCS上产生明显的竞争吸附。准二级反应动力学模型及Langmuir等温吸附模型可分别较好地描述磷的吸附动力学及吸附等温线试验结果;再生试验表明:采用0.1 mol/L的NaOH溶液可以使得IOCS再生,且再生次数对吸附容量影响不大。

Removal of phosphate from aqueous solution using iron-oxide coated sand （IOCS） was investigated by batch experiments under various conditions of pH, adsorption time, and background ions. Experimental results showed that phosphate removal achieved the best at neutral solution, and its competitive adsorption occurred when antimony was added. The data obtained from kinetic and isotherm experiments could be well described using pseudo-second-order rate model and Langmuir isotherm respectively, The regeneration experiments demonstrated that phosphate adsorbed on IOCS can be recovered by 0. 1 mol/L NaOH, and times of desorption-regeneration have little effect on the IOCS adsorption capacity.