淀粉类水滑石同时去除水中磷酸根和硬度  

Simultaneous removal of phosphate and hardness from water by Starch hydrotalcite

作　　者：许昶雯 陈国兵 张进[3] 张磊 XU Changwen;CHEN Guobing;ZHANG Jin;ZHANG lei(College of Civil and Architectural Engineering,Chuzhou University,Chuzhou 239000,China;Anhui Dade Mechanical and Electrical Equipment Co.Ltd,Chuzhou 239000,China;Unit 66220 of the PLA,Chuzhou 239000,China)

机构地区：[1]滁州学院土木与建筑工程学院,安徽滁州239000 [2]安徽大德机电设备有限公司,安徽滁州239000 [3]中国人民解放军66220部队,安徽滁州239000

出　　处：《黑龙江工程学院学报》2020年第4期31-36,共6页Journal of Heilongjiang Institute of Technology

基　　金：滁州学院大学生创新创业训练计划资助项目(S201910377074);安徽省高校自然科学研究重点项目(KJ2019A0641);国家自然科学基金项目(41601573);安徽省科技创新战略与软科学研究专项(1706a02020048)。

摘　　要：几种类水滑石吸附结果对比发现,经400℃焙烧的淀粉类水滑石(D-Mg/Al-HTC400)可同时去除水中磷酸根和硬度,因此,利用D-Mg/Al-HTC400作为吸附剂完成后续实验研究。考察吸附剂投加量、温度、反应时间对磷酸根离子和硬度吸附率的影响,并分别利用伪一级、伪二级和层间扩散模型对磷酸根离子和硬度吸附过程进行动力学拟合。结果表明:在吸附剂投加量为6 g/L时,其在4 h内对初始浓度为20 mg/L磷酸根离子和500 mg/L硬度的吸附率分别达到96.5%和45.9%;随着温度升高,吸附磷酸根和硬度的反应速率加快;磷酸根的吸附过程以化学反应为主,活化能为37.74 kJ/mol,硬度的吸附过程随着温度升高由以物理反应为主转向以化学反应为主,活化能为160.82 kJ/mol。The comparison results of the adsorption of several hydrotalcite-like found that the starch hydrotalcite calcined at 400℃(D-Mg/Al-HTC400)could remove phosphate and hardness simultaneously.Therefore,D-Mg/Al-HTC400 was used as an adsorbent to complete subsequent experimental research.The effects of adsorbent dosage,temperature and reaction time on phosphate ion and hardness adsorption rate were investigated,kinetic fitting of phosphate ion and hardness adsorption process using pseudo first-order,pseudo-secondary and inter-layer diffusion models,respectively.The result showed that when the dosage of adsorbent was 6g/L,the adsorption rate of 20 mg/L phosphate ion and 500 mg/L hardness reached 96.5%and 45.9%respectively within 4 h.As the temperature increased,the reaction rate of adsorbing phosphate and hardness increased.The adsorption process of phosphate was mainly chemical reaction,and the activation energy was 37.74 kJ/mol.The adsorption process of hardness changed from physical reaction to chemical reaction with increasing temperature,and the activation energy was 160.82 kJ/mol.

关 键 词：淀粉类水滑石 磷酸根 硬度 吸附动力学 

分 类 号：X52[环境科学与工程—环境工程]