La(OH)_3改性膨润土制备及其对磷吸附性能研究  

Adsorption Properties of Phosphate by Lanthanum Modified Bentonite

作　　者：钱程[1] 刘兴勇[2] 袁基刚[2] 曹洪岩[3] 

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》2017年第7期100-104,共5页China Water & Wastewater

基　　金：四川省科技支撑计划项目(2014GZ0132);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：采用硝酸镧和氢氧化钠制备La(OH)_3改性膨润土,利用扫描电子显微镜(SEM)、能量色散X射线荧光光谱仪(EDX)和X射线衍射分析仪(XRD)对改性前后样品的组成、形貌进行表征,并分析了初始pH值、吸附剂添加量和吸附时间对其吸附磷性能的影响。结果表明,改性后膨润土形貌和成分均有明显变化;增加改性膨润土用量和吸附时间在一定范围内有助于提高对磷的吸附量,其吸附动力学可用拟二级动力学方程描述,等温吸附模型符合Langmuir方程。The La（OH） 3 modified bentonite was prepared by using lanthanum nitrate and NaOH solution as the activation agent. The composition and feature of original and modified samples were characterized by SEM, EDX and XRD. The influences of pH, adsorbent dosage and adsorption time on properties of phosphorus adsorption were investigated through static adsorption test. The results showed that the morphology and composition of bentonite had obvious change after modification with lanthanum content increasing. The adsorption quantity of phosphate could improve by increasing the modified bentonite dosage and the adsorption time within a certain range. The adsorption dynamics could be well described with pseudo-second-order kinetic equation and the adsorption isotherm model was fitted to Langmuir equation.

关 键 词：La(OH)3 改性膨润土 磷 吸附性能 

分 类 号：X703[环境科学与工程—环境工程]