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掺杂TiO2插层蒙脱石黏土去除溶液中的镍
作者:张敬红1 2 王淑勤1 2 刘丽凤2  剑2 
单位:(1. 华北电力大学 “区域能源系统优化”教育部重点实验室 北京 100084  2. 华北电力大学环境科学与工程学院 北京 100084) 
关键词:掺杂二氧化钛 插层蒙脱石黏土 吸附机理 镍离子 
分类号:X52
出版年,卷(期):页码:2019,47(10):0-0
DOI:
摘要:

 采用溶胶?凝胶法制备掺杂TiO2插层蒙脱石黏土。对插层蒙脱石黏土性能进行了表征,研究了掺杂TiO2插层蒙脱石黏土吸附镍动力学,推测了掺杂TiO2插层蒙脱石黏土吸附反应的机理。结果表明:N-F-Al共掺TiO2插层蒙脱石黏土投加量为10 g/L时,对初始浓度为10 mg/L的Ni2+去除效率达97.2%以上;吸附过程符合二级动力学方程,N-F-Al共掺TiO2插层蒙脱石黏土反应速率常数最大,为纯TiO2插层蒙脱石黏土的4.3倍;掺杂TiO2插层蒙脱石黏土保持着层状结构和片状分布,钛离子进入层间形成均一的“柱子”状结构,层间结构均一。纯TiO2有锐钛矿型和金红石型2种晶型,由于掺杂元素的存在,掺杂后金红石相受到抑制生长,而锐钛矿晶面规则生长,晶型更加完整。与非插层蒙脱石黏土相比,插层蒙脱石黏土有更好的沉降性能和更多的连续使用次数。

基金项目:
国家自然科学基金项目(51708212);中央高校基本科研业务费专项资金(2017 MS136)。
作者简介:
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