锆柱撑膨润土对水中磷的吸附和再生性能研究  

Adsorption and Regeneration of Phosphate in Aqueous Solution on Zirconium Pillared Bentonite

作　　者：钱程 刘兴勇 杨虎 曹洪岩 QIAN Cheng;LIU Xingyong;YANG Hu;CAO Hongyan(Analysis and Test Center;Institute of Chemical Engineering,Siehuan University of Science ＆ 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]四川理工学院化学工程学院,四川自贡643000

出　　处：《四川理工学院学报（自然科学版）》2018年第3期7-15,共9页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：四川省科技支撑计划项目(2014GZ0132);四川省教育厅科研创新团队项目(17TD0025);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项目(2016JXY03)

摘　　要：以膨润土为原料,采用浸渍法制备羟基锆改性膨润土,并用于水中磷的吸附。考察了锆/膨润土(Zr/R-B)摩尔质量比为0.2 mmol/g,0.4 mmol/g,0.6 mmol/g,0.8 mmol/g,1.0 mmol/g,1.2 mmol/g时磷的吸附性能,研究了吸附时间、初始浓度和pH等因素对羟基锆改性膨润土吸附磷的影响,并对吸附机理进行分析。结果表明:改性后膨润土磷吸附性能显著提高,Zr/R-B为0.8 mmol/g时磷吸附效果较好。吸附动力学可用拟二级动力学方程描述,吸附等温线符合Langmuir模型,吸附为化学吸附,且温度为293 K条件下,理论最大吸附量为13.3 mg/g。pH的升高不利于磷的吸附。0.1 mol/L NaOH条件下,经过5次循环再生,羟基锆改性膨润土对磷的吸附量降低18.6%。SEM-EDS、pH和XPS分析表明,磷的吸附机理主要为配体交换。The zirconium modified bentonite was prepared through impregnation method successfully at different Zr/R-B of 0. 2,0. 4,0. 6,0. 8,1. 0,1. 2 mmol/g and used for the removal of phosphate from aqueous solution. In batch experiments,the influence of contact time,initial phosphate concentrations,and pH value on the adsorption property and adsorption mechanism were investigated in detail. Results showed that the adsorption property was promoted after modification,and a better adsorption capacity was obtained at Zr/R-B = 0. 8 mmol/g. Adsorption kinetics followed the pseudo-second-order model,the adsorption isotherm could be well described by the Langmuir adsorption model with a maximum phosphate adsorption capacity of 13. 3 mg P/g at 293 K,indicated that the phosphate adsorption onto hydroxy-zirconium modified bentonites should be chemical adsorption. pH study showed that the increase of pH value was unfavourable for the adsorption. The adsorption capacity of the zirconium modified bentonites showed a loss of 18. 6% after five cycles of adsorption-desorption studies by using 0. 1 mol/L NaOH as the desorption reagent. The phosphate adsorption mechanism was investigated by the of SEM-EDS,XPS and pH,which suggested that the ligand-exchange process between hydroxyl group（-OH） and phosphate.

关 键 词：锆 膨润土 磷 吸附 再生 

分 类 号：X522[环境科学与工程—环境工程]