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

被引:101
作者
Ahmed, Ahmed Khaled Abdella [1 ,3 ]
Sun, Cuizhen [1 ,2 ]
Hua, Likun [1 ]
Zhang, Zhibin [1 ,2 ]
Zhang, Yanhao [1 ,2 ]
Zhang, Wen [1 ]
Marhaba, Taha [1 ]
机构
[1] New Jersey Inst Technol, John A Reif Jr Dept Civil & Environm Engn, Newark, NJ 07102 USA
[2] Shandong Jianzhu Univ, Sch Municipal & Environm Engn, Jinan 250101, Shandong, Peoples R China
[3] Sohag Univ, Dept Civil Engn, Sohag 82524, Egypt
关键词
Microbubbles; Nanobubbles; Surface energy; Zeta potential; Bubble size; NANO-BUBBLES; WATER; MICROBUBBLE; TECHNOLOGY; CAVITATION; DYNAMICS; GROWTH; OXYGEN;
D O I
10.1016/j.chemosphere.2018.03.157
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
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. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:327 / 335
页数:9
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