【摘要】 以膨润土为原料,制备钙改性膨润土（Ca-B）,采用动态吸附试验,研究了磷初始浓度、流量、初始p H值和共存离子对Ca-B吸附磷性能的影响。结果表明,一定程度上增加初始磷浓度有助于提高Ca-B的磷吸附量; pH值的升高和流量的增加均不利于Ca-B对磷的吸附;共存离子Cl^-和NO₃^-对Ca-B吸附磷的影响较小,但F-会抑制Ca-B对磷的吸附。采用NaOH溶液对Ca-B进行再生,增加NaOH浓度有利于磷酸根的洗脱,当NaOH浓度为1. 0 mol/L时对磷的洗脱率较高,达到了88. 4%。Ca-B具有较好的再生能力,经过5次循环吸附和再生后,对磷的吸附量仅下降了15. 7%。更多还原

【Abstract】 Calcium modified bentonite（ Ca-B） was prepared from bentonite,which was used for dynamic adsorption of phosphate. The effects of initial phosphate concentration,flow rate,initial p H and coexisted ions on phosphate adsorption capacity of Ca-B were investigated. The results showed that increasing the initial phosphate concentration could improve the phosphate adsorption capacity of Ca-B,but the increase of pH value and flow rate was unfavorable for the phosphate adsorption capacity of Ca-B. Coexisting ions of Cl^-and NO₃^- had little influence on phosphate adsorption by Ca-B,while F-could restrain phosphate adsorption by Ca-B. NaOH solution was used to regenerate Ca-B. The increase of NaOH concentration was beneficial to the eluting of phosphate,and the maximum elution rate reached 88. 4%when NaOH concentration was 1. 0 mol/L. Ca-B had good regeneration capacity,and its adsorption capacity of phosphate decreased by only 15. 7% after five cycles of adsorption and regeneration.更多还原