Corrosion-Resistant Hydrophobic MFI-Type Zeolite-Coated Mesh for Continuous Oil-Water Separation

TY - JOUR

T1 - Corrosion-Resistant Hydrophobic MFI-Type Zeolite-Coated Mesh for Continuous Oil-Water Separation

AU - Cai, Yongwei

AU - Zhao, Qi

AU - Quan, Xuejun

AU - Zhu, Jiao

AU - Zhou, Chao

PY - 2020/2/26

Y1 - 2020/2/26

N2 - Efficient separation of oil-water mixtures has become a critical challenge due to frequent oil-spill accidents and enormous release of oil-containing wastewater by households or catering services. Superhydrophobic coatings on metal meshes have been evidenced as the effective and energy-saving materials for oil-water separation. However, it is difficult to fabricate the separating coatings with long-term superhydrophobicity and the outstanding anticorrosion properties for practical application. In this study, we fabricated the hydrophobic Mobil five (MFI)-type zeolite coatings on the pristine stainless steel meshes via an in situ crystallization method and subsequently modified them with an environmentally safe hexadecyltrimethoxysilane compound. The as-prepared coating meshes showed good self-cleaning, antifouling, and anticorrosion properties. Furthermore, the coated meshes were capable of continuously and efficiently separating different kinds of oil-water mixtures under gravity-driven pressure and had more than 99.0% high separation efficiency. More important, the prepared hydrophobic MFI-coated meshes had equivalent separation performance compared to that of superhydrophobic coating meshes. Meanwhile, the hydrophobic MFI-coated meshes demonstrated excellent reusability performance and long-term stability. These as-prepared meshes thus have great potential for applications in separating oily wastewater from oil fields as well as recycling of waste oil from catering services.

AB - Efficient separation of oil-water mixtures has become a critical challenge due to frequent oil-spill accidents and enormous release of oil-containing wastewater by households or catering services. Superhydrophobic coatings on metal meshes have been evidenced as the effective and energy-saving materials for oil-water separation. However, it is difficult to fabricate the separating coatings with long-term superhydrophobicity and the outstanding anticorrosion properties for practical application. In this study, we fabricated the hydrophobic Mobil five (MFI)-type zeolite coatings on the pristine stainless steel meshes via an in situ crystallization method and subsequently modified them with an environmentally safe hexadecyltrimethoxysilane compound. The as-prepared coating meshes showed good self-cleaning, antifouling, and anticorrosion properties. Furthermore, the coated meshes were capable of continuously and efficiently separating different kinds of oil-water mixtures under gravity-driven pressure and had more than 99.0% high separation efficiency. More important, the prepared hydrophobic MFI-coated meshes had equivalent separation performance compared to that of superhydrophobic coating meshes. Meanwhile, the hydrophobic MFI-coated meshes demonstrated excellent reusability performance and long-term stability. These as-prepared meshes thus have great potential for applications in separating oily wastewater from oil fields as well as recycling of waste oil from catering services.

KW - hydrophobic coating

KW - stainless steel mesh

KW - MFI

KW - in situ crystallization

KW - oil-water separation

UR - https://www.scopus.com/pages/publications/85081012950

U2 - 10.1021/acs.iecr.9b05923

DO - 10.1021/acs.iecr.9b05923

M3 - Article

AN - SCOPUS:85081012950

SN - 0888-5885

VL - 59

SP - 3498

EP - 3510

JO - Industrial & Engineering Chemistry Research (IECRED)

JF - Industrial & Engineering Chemistry Research (IECRED)

IS - 8

ER -