钙改性膨润土对磷的动态吸附及其再生研究  

Dynamic Adsorption of Phosphate by Calcium Modified Bentonite and Its Regeneration

作　　者：钱程 袁基刚 张峰榛 刘兴勇 曹洪岩 QIAN Cheng;YUAN Ji-gang;ZHANG Feng-zhen;LIU Xing-yong;CAO Hong-yan(Analytical and Testing Center,Sichuan University of Science ＆ Engineering,Zigong 643000,China;College of Chemistry ＆ Environmental Engineering,Sichuan University of Science ＆ Engineering,Zigong 643000,China;College of Chemical Engineering,Sichuan University of Scienee ＆ Engineering,Zigong 643000,China)

机构地区：[1]四川理工学院分析测试中心,四川自贡643000 [2]四川理工学院化学与环境工程学院,四川自贡643000 [3]四川理工学院化学工程学院,四川自贡643000

出　　处：《中国给水排水》2018年第17期108-111,共4页China Water & Wastewater

基　　金：四川省教育厅科研创新团队项目(17TD0025);四川省科技计划项目(2018GZ0378);四川省科技创新苗子工程项目(2018079);精细化工助剂及表面活性剂四川省高校重点实验室开放基金资助项目(2016JXY03)

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NO_3^-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%。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 pH and coexisted ions on phosphate adsorption capacity of Ca-B were investigated. The results showed that in- creasing 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. Co- existing ions of C1- and NO3- had little influence on phosphate adsorption by Ca-B, while F- could re- strain 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 ca- pacity of phosphate decreased by only 15.7% after five cycles of adsorption and regeneration.

关 键 词：膨润土 钙 除磷 动态吸附 再生 

分 类 号：TU992[建筑科学—市政工程]