硝酸对溶胶-凝胶法制备AlOOH胶粒粒度的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (9): 3105-3113.

硝酸对溶胶-凝胶法制备AlOOH胶粒粒度的影响

段宁¹, 张湘泰¹, 陆成龙², 张银凤^1,2, 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

收稿日期:2021-03-23 修回日期:2021-04-23 出版日期:2021-09-15 发布日期:2021-10-08
通讯作者: 张银凤,博士,副教授。E-mail:zhangyinfeng2018@163.com
作者简介:段宁(1976—),女,博士,副教授。主要从事水处理工艺及功能材料方向的研究。E-mail:dn828@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(2019106)

Influence of HNO₃ on Particle Size of AlOOH Sol Prepared by Sol-Gel Method

DUAN Ning¹, ZHANG Xiangtai¹, LU Chenglong², ZHANG Yinfeng^1,2, 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 Polytechnic University, Huangshi 435003, China

Received:2021-03-23 Revised:2021-04-23 Online:2021-09-15 Published:2021-10-08

摘要/Abstract

摘要： 为获得孔径可控的氧化铝滤膜,以异丙醇铝为原料,硝酸为胶溶剂,使用溶胶-凝胶法制备了AlOOH溶胶,并通过纳米粒度仪、Zeta电位等表征手段,研究了硝酸用量对AlOOH胶粒粒度及粒度分布的影响。结果表明,硝酸与异丙醇铝摩尔比R(n(HNO₃):n(Al(C₃H₇O₃)₃))为0.2~0.7时,随着R增大,AlOOH胶粒的平均粒径从66.69 nm(R=0.2)增大到138.80 nm(R=0.7),其粒度分布曲线的半高宽(FWHM)由144.62 nm增加到267.74 nm。AlOOH溶胶的粒度增大不是由颗粒团聚引起的,而是硝酸加入增大了异丙醇铝水解反应常数,使单位体积内能发生缩聚的中间产物增加,从而促进了AlOOH胶粒的生长。

关键词: 溶胶-凝胶法, AlOOH溶胶, 硝酸, 粒度, 水解反应常数

Abstract: To obtain an alumina filter membrane with a controllable pore size, AlOOH sol was prepared by the sol-gel method with aluminum isopropoxide used as the raw material and HNO₃ as the peptizer. The influence of the amount of HNO₃ on the particle size distribution of AlOOH colloidal particles was studied through nano-particle size analysis and Zeta potential measurement. The results show that when the ratio of HNO₃ to aluminum isopropoxide R(n(HNO₃):n(Al(C₃H₇O₃)₃)) is in the range of 0.2 to 0.7, the average particle size of the colloidal particles increases with the increase of R, from 66.69 nm (R=0.2) to 138.80 nm (R=0.7). The full width at half maxima (FWHM) of the particle size distribution of the colloidal particles increased from 144.62 nm to 267.74 nm. The reason for the increase of the particle size of AlOOH sol isŃt the agglomeration of particles, but the increase of the hydrolysis reaction constant of aluminum isopropoxide, which increases the total amount of the intermediate products per unit volume involved in the polycondensation reaction, thereby promoting the growth of AlOOH colloidal particles.

Key words: sol-gel method, AlOOH sol, nitric acid, particle size, hydrolysis reaction constant

中图分类号:

TQ174.6⁺7

段宁, 张湘泰, 陆成龙, 张银凤, 李崇瑞. 硝酸对溶胶-凝胶法制备AlOOH胶粒粒度的影响[J]. 硅酸盐通报, 2021, 40(9): 3105-3113.

DUAN Ning, ZHANG Xiangtai, LU Chenglong, ZHANG Yinfeng, LI Chongrui. Influence of HNO₃ on Particle Size of AlOOH Sol Prepared by Sol-Gel Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 3105-3113.

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