氧化铝对硅酸的吸附去除机理

doi:10.11894/iwt.2018-0597

工业水处理 ›› 2019, Vol. 39 ›› Issue (7): 27-31. doi: 10.11894/iwt.2018-0597

氧化铝对硅酸的吸附去除机理

韩珏¹(),杜聪¹,刘忠新¹,白淑琴^1,^2,*()

1. 内蒙古大学生态与环境学院, 内蒙古呼和浩特 010021
2. 长江师范学院绿色智慧环境学院, 重庆 408100

收稿日期:2019-04-23 出版日期:2019-07-20 发布日期:2019-08-07
通讯作者: 白淑琴 E-mail:hanjue0607@163.com;baishuqin2000@163.com
作者简介:韩珏(1993-),硕士在读。电话:13739987412, E-mail: hanjue0607@163.com
基金资助:
国家自然科学基金项目(21666025);内蒙古自然科学基金项目(2018MS02021);内蒙古自治区科技计划项目(201802101)

Adsorptive removal mechanism of alumina on silicic acid

Jue Han¹(),Cong Du¹,Zhongxin Liu¹,Shuqin Bai^1,^2,*()

1. School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
2. Green Intelligence Environment school, Yangtze Normal University, Chongqing 408100, China

Received:2019-04-23 Online:2019-07-20 Published:2019-08-07
Contact: Shuqin Bai E-mail:hanjue0607@163.com;baishuqin2000@163.com
Supported by:
国家自然科学基金项目(21666025);内蒙古自然科学基金项目(2018MS02021);内蒙古自治区科技计划项目(201802101)

摘要/Abstract

摘要：

探讨了氧化铝对水体中硅酸的吸附去除潜力、影响因素及机理。结果表明，pH 4~8时吸附量随pH、吸附剂投加量的增大而增加，说明氧化铝具有吸附去除硅酸的能力。吸附过程符合Langmuir吸附等温模式，最大吸附量达39.82 mg/g。结合²⁷Al MAS NMR与SEM-EDX分析，氧化铝吸附硅酸的机理是通过硅酸分子与氧化铝中4配位的铝发生化学反应，硅原子取代原来Al-O-Al键上的铝原子形成Al-O-Si键而被固定在氧化铝表面。

关键词: 氧化铝, 硅酸, 吸附等温模式, 吸附机理

Abstract:

The adsorptive removal potential, influencing factors and adsorption mechanism of alumina on silicic acid in water were discussed. The results showed that the adsorption amount of silicic acid increased with the increase of pH(in the range of pH 4-8) and dosage of adsorbent, which showed that alumina had the potential ability to remove silicic acid. The adsorption process was well consistent with the Langmuir isotherm model with a maximum adsorption capacity of 39.82 mg/g. According to the results of ²⁷Al MAS NMR and SEM-EDX analysis, the adsorption mechanism of alumina on silicic acid was that the silicic acid molecular reacted with tetra-coordinated aluminum to form Al-O-Si bond by substitution reaction of the aluminum atom by silicon atom on the original Al-O-Al bond and fixed on the surface of the alumina.

Key words: alumina, silicic acid, adsorption isotherm model, adsorption mechanism

中图分类号:

TU991.2

韩珏,杜聪,刘忠新,白淑琴. 氧化铝对硅酸的吸附去除机理[J]. 工业水处理, 2019, 39(7): 27-31.

Jue Han,Cong Du,Zhongxin Liu,Shuqin Bai. Adsorptive removal mechanism of alumina on silicic acid[J]. Industrial Water Treatment, 2019, 39(7): 27-31.

https://www.iwt.cn/CN/Y2019/V39/I7/27

图/表 6

图1 pH对硅酸吸附率的影响

图2 氧化铝投加量对硅酸吸附率的影响

图3 三种吸附等温模式的拟合曲线

表1 Langmuir、Freundlich和Temkin吸附等温方程拟合参数

Langmuir	Freundlich	Temkin
Q_m = 39.82 mg/g	n_f = 3.535	A_T=0.575
b=0.048	K_f=8.587	B_T=7.969
r²=0.935	r²=0.848	r²=0.891

图4 纯Al₂O₃和吸附硅酸的Al₂O₃的²⁷Al MAS NMR

图5 吸附硅酸的Al₂O₃的²⁷Al MAS NMR

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