海藻酸钠-铁凝胶球对无机磷和Cr2O72-吸附

摘要

The features of the sodium alginate into a ball in ferric chloride and the characters of gel ball SA - Fe adsorbing phosphorus and Cr2O72- were studied in this experiment. The results showed that the gell ball SA - Fe had strong ability to adsorb phosphorus and Cr2O2-7 . And the gel ball SA - Fe preferentially adsorbs phosphorus. Relative to Cr2O2-7 , PO3-4 has priority level to combine with Fe3+ . The adsorption type of gel ball SA - Fe adsorbing phosphorus and Cr2O2-7 belonged to Langmuir adsorption isothermal curve which was single molecule layer adsorption. The Fe3+ in gel ball reacted with the Cr2O2-7 and PO3-4 in solution. And Fe2(Cr2O7)3 and FePO4 were produced in grids and were wiped off.%对海藻酸钠在氯化铁溶液中的成球特性,制备海藻酸钠-铁( SA - Fe)凝胶球,并对废水中无机磷和Cr2 O72 -吸附容量及吸附机理进行了研究.结果表明,SA - Fe凝胶球对溶液中的无机磷和Cr2O72-有较强的吸附能力,且SA - Fe凝胶球在对无机磷和Cr2O72-的吸附过程中优先吸附无机磷.相对于Cr2O72-,PO43-与Fe3+的结合具有优先级.SA - Fe凝胶球吸附无机磷和Cr2O7-2的等温吸附曲线都更加符合Langmuir型,吸附行为属于单分子层吸附,凝胶球网络中的Fe3+与溶液中Cr2O72-和PO43-发生化学反应,生成Fe2( Cr2O7)3和FePO4,被吸附于凝胶网格中去除.