氨水对溶胶-凝胶法制备硅溶胶粒径及稳定性的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (7): 2589-2596.

所属专题：陶瓷

氨水对溶胶-凝胶法制备硅溶胶粒径及稳定性的影响

熊江敏¹, 段宁¹, 陆成龙^2,3, 张银凤², 李崇瑞¹

1.武汉科技大学资源与环境工程学院,武汉 430081;
2.湖北理工学院矿区环境污染控制与修复湖北省重点实验室,黄石 435003;
3.湖北理工学院先进材料制造与固废资源化协同技术湖北省工程研究中心,黄石 435003

收稿日期:2023-03-03 修订日期:2023-04-25 出版日期:2023-07-15 发布日期:2023-07-25
通信作者: 陆成龙,博士,副教授。E-mail:cjwust@126.com
作者简介:熊江敏(1998—),男,硕士研究生。主要从事水处理陶瓷材料方面的研究。E-mail:17388966958@163.com
基金资助:
矿区环境污染控制与修复湖北省重点实验室开放基金(2021XZ103)

Effect of Ammonia on Particle Size and Stability of Silica Sol Prepared by Sol-Gel Method

XIONG Jiangmin¹, DUAN Ning¹, LU Chenglong^2,3, ZHANG Yinfeng², LI Chongrui¹

1. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polythechnic University, Huangshi 435003, China;
3. Hubei Engineering Research Center for Collaborative Technology of Advanced Material Manufacturing and Solid Waste Recycling, Hubei Polythechnic University, Huangshi 435003, China

Received:2023-03-03 Revised:2023-04-25 Online:2023-07-15 Published:2023-07-25

摘要/Abstract

摘要： 本文以正硅酸乙酯(TEOS)为原料,在以氨水为催化剂的碱体系中,采用溶胶-凝胶法制备了二氧化硅溶胶。通过SEM-EDS、XRD、热重分析、激光粒度分析、Zeta电位等分析手段,研究了氨水的加入量对二氧化硅溶胶粒径以及稳定性的影响。研究结果表明,当pH值在11~12、氨水与TEOS的摩尔比R(n(NH₃·H₂O)∶n(TEOS))在1~10时,随着R值的增大,二氧化硅溶胶平均粒径y与R值x呈指数相关趋势,其拟合函数为y=2.22x^1.79,相关性为0.96,粒径从10.17 nm (R=1)增加到142.48 nm (R=10),且胶粒的粒径分布半高宽从9.89 nm (R=1)增加到171.61 nm (R=10)。二氧化硅溶胶的稳定性则与氨水的加入量呈下抛物线趋势,其凝胶时间从684 h (R=1)下降到28 h (R=5),再上升到780 h (R=10)。

关键词: 氨水, 溶胶-凝胶法, 二氧化硅溶胶, 粒度, 稳定性, 纳米结构

Abstract: Silica sols were prepared by the sol-gel method using ethyl orthosilicate (TEOS) as raw material and ammonia as catalyst. The effect of ammonia addition on the particle size as well as the stability of silica sols were studied through SEM-EDS, XRD, thermogravimetric analysis, laser particle size analysis, Zeta potential, and other analytical means. The results show that when the pH value is in the range of 11~12 and the molar ratio of ammonia to ethyl orthosilicate R(n(NH₃·H₂O)∶n(TEOS)) is in the range of 1~10, the average particle size y of silica sol is index correlated with the R value x. The fitted function is y=2.22x^1.79 with a correlation coefficient of 0.96, and the particle size increases from 10.17 nm (R=1) to 142.48 nm (R=10), and the half-height width of the particle size distribution increases from 9.89 nm (R=1) to 171.61 nm (R=10). The stability of the silica sol shows a downward parabolic trend with the addition of ammonia, with the gel time decreasing from 684 h (R=1) to 28 h (R=5) and then increasing to 780 h (R=10).

Key words: ammonia, sol-gel method, silica sol, particle size, stability, nanostructure

中图分类号:

TQ127.2

熊江敏, 段宁, 陆成龙, 张银凤, 李崇瑞. 氨水对溶胶-凝胶法制备硅溶胶粒径及稳定性的影响[J]. 硅酸盐通报, 2023, 42(7): 2589-2596.

XIONG Jiangmin, DUAN Ning, LU Chenglong, ZHANG Yinfeng, LI Chongrui. Effect of Ammonia on Particle Size and Stability of Silica Sol Prepared by Sol-Gel Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2589-2596.

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氨水对溶胶-凝胶法制备硅溶胶粒径及稳定性的影响

Effect of Ammonia on Particle Size and Stability of Silica Sol Prepared by Sol-Gel Method

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