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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引用次数: 0

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.

Abstract Image

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氧等离子体改性PVDF和PTFE膜提高气隙膜蒸馏处理偶氮染料废水的性能

膜蒸馏（MD）面临着低渗透通量、膜污染和润湿等挑战。近年来的研究进展主要集中在膜表面改性以提高MD效率，等离子体辐照是一种很有前途的技术。方法采用氧等离子体辐照对聚四氟乙烯（PTFE）和聚偏氟乙烯（PVDF）膜进行改性，并应用于气隙膜蒸馏（AGMD）工艺处理染料废水，特别是CI活性红241 （RR）和CI酸黄79 （AY）。并对渗透通量、除色效率和污染因素进行了评价。结果表明：改性膜的表面形貌发生了变化，表面粗糙度增加，与水的接触角分别为135°（PVDF）和145°（PTFE）。在水试验中，改性聚四氟乙烯的平均渗透通量最高为9.53 kg/m².h，随着染料浓度的增加而降低。除色率达99%以上，其中复染率为24.57%，复染率为35.10%。改性PVDF膜对AY的渗透通量为17.50 kg/m².h。然而，脱色率仅为48.92%，表明潮湿问题。等离子体改性聚四氟乙烯可以潜在地改善染料处理中的AGMD性能；然而，改性后的PVDF需要进一步优化。本研究强调了了解染料与膜材料之间的化学相互作用对优化AGMD工艺的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.