Enhanced performance of air gap membrane distillation for azo dye wastewater treatment using oxygen-plasma-modified PVDF and PTFE membranes

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-02-12 DOI:10.1016/j.jtice.2025.106006

Hismi Susane , Ya-Fen Wang , Sheng-Jie You

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Abstract

Background

Membrane distillation (MD) faces challenges, such as low permeate flux, membrane fouling, and wetting. Recent advancements have focused on membrane surface modification to improve efficiency of MD, with plasma irradiation emerging as a promising technique.

Methods

Polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) membranes were modified by oxygen plasma irradiation and applied in air gap membrane distillation (AGMD) to treat dye wastewater, specifically CI Reactive Red 241 (RR) and CI Acid Yellow 79 (AY). Permeate flux, color removal efficiency, and fouling factors were also evaluated.

Significant Findings

The modified membranes exhibited changes in surface morphology and increased surface roughness with water contact angles of 135° (PVDF) and 145° (PTFE). The highest average permeate flux for the modified PTFE was 9.53 kg/m².h during the water test, and decreased with increasing dye concentration. The color removal exceeded 99 % with fouling factors of 24.57 % for RR and 35.10 % for AY. The modified PVDF membrane achieved a permeate flux of 17.50 kg/m².h for AY. However, the color removal was only 48.92 %, suggesting wetting issues. Plasma-modified PTFE can potentially improve the AGMD performance in dye treatment; however, further optimization of the modified PVDF is needed. This study emphasizes the importance of understanding the chemical interactions between dyes and membrane materials for optimizing the AGMD processes.

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.