Stability and physicochemical properties of air nanobubbles

doi:10.16085/j.issn.1000-6613.2021-2388

Abstract

Abstract:

The physicochemical properties of air nanobubbles (Air-NBs) are the basis of their wide application. In this study, the physicochemical properties of Air-NBs produced by the principle of hydrodynamic cavitation, including the particle size distribution and zeta potential, were studied on the nanoparticle size-zeta potential analyzer. The effects of operating pressure, electrolyte concentration, pH and temperature on the physicochemical properties of Air-NBs were investigated, as well as the stability of Air-NBs respectively in deionized water and CaCl₂ solution. The results showed that the higher the pressure of the nano bubble generator, the larger the proportion of small particle size of Air-NBs, and the addition of electrolyte helped to reduce the particle size of bubbles. The average particle size distribution of Air-NBs decreased with the increase of electrolyte concentration, pH and temperature. However, the coalescence between bubbles was ascribed to the gradual increase of the particle size with time going. The Air-NBs particle size in the two solutions was monitored online. It was found that the Air-NBs could exist in the solutions for 5 days. The stability of Air-NBs in solution can be explained reasonably through DLVO theory and zeta potential effect.

Key words: air nanobubbles, electrolytes, particle size distribution, zeta potential, stability

摘要：

空气纳米气泡（Air-NBs）的理化特性是其广泛应用的基础。本文利用纳米粒度-zeta电位分析仪研究了水力空化原理产生的Air-NBs的理化特性，即粒径分布和zeta电位，考察了装置运行压力、电解质浓度、pH和温度对Air-NBs理化特性的影响；同时考察了去离子水和CaCl₂溶液中Air-NBs稳定性。结果表明：纳米气泡发生器的压力越大，其产生的Air-NBs的小粒径比例更大，且电解质的加入有助于气泡粒径的缩小。随着溶液中电解质浓度、pH和温度的升高，溶液中Air-NBs的平均粒径逐渐减小，但气泡间的聚结作用会导致其粒径随时间逐渐增大；通过对两种溶液中Air-NBs粒径的实时监测发现其能在溶液中存在5天之久。胶体稳定（DLVO）理论和zeta电位效应可以合理阐释溶液中Air-NBs的稳定性。

关键词: 空气纳米气泡, 电解质, 粒径分布, zeta电位, 稳定性

CLC Number:

X703.1

CHEN Erjun, ZHANG Yuling, LU Shaolei, DUAN Haiyang, JIN Wenzhang. Stability and physicochemical properties of air nanobubbles[J]. Chemical Industry and Engineering Progress, 2022, 41(9): 4673-4681.

陈二军, 张玉玲, 路少磊, 段海洋, 靳文章. 空气纳米气泡的稳定性及理化特性[J]. 化工进展, 2022, 41(9): 4673-4681.

Figures/Tables 8

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参数	数值	参数	数值
型号	LF-1500	液体管或气体管/mm	ϕ6×2
电压/V	220（AC）	最大使用压力/MPa	0.8
功率/W	90	自吸高度/m	0.8
温度范围/℃	0~75	工况流量/mL·min^-1	1500

参数	数值	参数	数值
型号	LF-1500	液体管或气体管/mm	ϕ6×2
电压/V	220（AC）	最大使用压力/MPa	0.8
功率/W	90	自吸高度/m	0.8
温度范围/℃	0~75	工况流量/mL·min^-1	1500

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