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

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...

Full description

Saved in:
Bibliographic Details
Published inChemosphere (Oxford) Vol. 203; pp. 327 - 335
Main Authors Ahmed, Ahmed Khaled Abdella, Sun, Cuizhen, Hua, Likun, Zhang, Zhibin, Zhang, Yanhao, Zhang, Wen, Marhaba, Taha
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.07.2018
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary: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. [Display omitted] •Nanobubbles (NBs) are generated with tubular ceramic membranes.•Injected gas pressure affects bubble size and zeta potential of NBs.•NBs size increases with membrane pore size.•Hydrophobic ceramic membrane surface reduced bubble size and zeta potential of NBs.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2018.03.157