Fabrication of tannic acid-(3-amino)propyltriethoxysilane with zwitterionic carbon quantum dots coating on cellulose acetate tubular membrane for oil-water emulsion separation

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Document Type

Article

Source Title

Journal of the Taiwan Institute of Chemical Engineers

Volume

165

Publication Date

2024

Abstract

Background: The discharge of large volumes of oily wastewater from industries has been a serious global concern. In recent years, membrane filtration has been considered an effective method for treating oily wastewater. However, membrane fouling is a major challenge inherent to this approach. Methods: This study integrated zwitterionic carbon quantum dots (ZQDs) into a tannic acid-(3-aminopropyl) triethoxysilane (TA-APTES) coating on cellulose acetate (CA) tubular membranes to explore the potential for improve the hydrophilicity and anti-fouling properties of the membrane. The CA tubular membrane was fabricated by dry/wet spinning method. A green and one-step synthesis of TA-APTES with ZQDs was utilized to modify the surface of the CA pristine membrane. Significant findings: Incorporating ZQDs enhanced the membrane’s hydrophilicity. Results showed that the modified membrane with ZQDs (CA/T 0.4 12.53 ± 0.9 ◦ , A+ZQDs) displayed super hydrophilicity with a water contact angle of pure water permeance of 987.13 ± 57.9 L m 577.10 ± 64.7 L m-2 h-1 bar-1-2 h-1 bar-1 , diesel-water emulsion permeance of , and enhanced oleophobicity with oil rejection rate of > 99 %. Furthermore, the CA/T0.4A+ZQDs membrane showed the best anti-fouling property, with the highest flux recovery ratio (FRR), lowest irreversible fouling ratio (R ir,1 of oil-water separation.

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Disciplines

Chemical Engineering

Keywords

Quantum dots; Separation (Technology); Oil separators

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