Generation of nanobubbles by ceramic membrane filters: The dependence of bubble size and zeta potential on surface coating, pore size and injected gas pressure

Zeta电位 气泡 陶瓷膜 粒径 陶瓷 化学工程 材料科学 大气压力 化学 纳米技术 分析化学(期刊) 纳米颗粒 复合材料 色谱法 机械 物理 地质学 工程类 海洋学 生物化学
作者
Ahmed Khaled Abdella Ahmed,Cuizhen Sun,Likun Hua,Zhibin Zhang,Yanhao Zhang,Wen Zhang,Taha F. Marhaba
出处
期刊:Chemosphere [Elsevier BV]
卷期号:203: 327-335 被引量:115
标识
DOI:10.1016/j.chemosphere.2018.03.157
摘要

Generation of gaseous nanobubbles (NBs) by simple, efficient, and scalable methods is critical for industrialization and applications of nanobubbles. Traditional generation methods mainly rely on hydrodynamic, acoustic, particle, and optical cavitation. These generation processes render issues such as high energy consumption, non-flexibility, and complexity. This research investigated the use of tubular ceramic nanofiltration membranes to generate NBs in water with air, nitrogen and oxygen gases. This system injects pressurized gases through a tubular ceramic membrane with nanopores to create NBs. The effects of membrane pores size, surface energy, and the injected gas pressures on the bubble size and zeta potential were examined. The results show that the gas injection pressure had considerable effects on the bubble size, zeta potential, pH, and dissolved oxygen of the produced NBs. For example, increasing the injection air pressure from 69 kPa to 414 kPa, the air bubble size was reduced from 600 to 340 nm respectively. Membrane pores size and surface energy also had significant effects on sizes and zeta potentials of NBs. The results presented here aim to fill out the gaps of fundamental knowledge about NBs and development of efficient generation methods.
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