Surface charge-switchable polyacrylonitrile/cellulose acetate/soluble eggshell membrane protein (PAN/CA/SEP) mixed matrix membrane for methylene blue removal

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-04-26 DOI:10.1016/j.seppur.2025.133211

Thong Siah , Henry Chee Yew Foo , Inn Shi Tan , Yin Fong Yeong , Man Kee Lam , Keat Teong Lee , Mee Kee Wong

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引用次数: 0

Abstract

The textile industry consumes over 700,000 tonnes of synthetic dyes annually, generating dye-polluted wastewater harmful to the environment. Thus, this study investigated the potential of electrospun microfibrous membranes (EMMs) for dye remediation. Two types of membranes were synthesised in this study: a flat sheet membrane (control) and a microfibrous membrane with a pH-sensitive charge-switchable surface for enhanced adsorption of methylene blue (MB) and methyl orange (MO). The microfibrous membrane is fabricated via direct-write electrospinning (DWES) using a modified 3D printer equipped with a 30 kV direct current (DC) power supply, resulting in a unique triangular pore network. The electrospinning solution comprises polyacrylonitrile (PAN), cellulose acetate (CA), and soluble eggshell membrane protein (SEP), with dopamine (PDA) grafted onto the surface to introduce pH sensitivity. Generally, the EMMs exhibited high surface area, porosity, mechanical robustness, and controllable wettability, making these membranes ideal for dye removal. Characterisation confirmed a well-defined pore network, surface charge migration, high thermal stability, and excellent permeability. Batch adsorption studies revealed an adsorption capacity of 21.80 mg/g under optimal conditions influenced by MB concentration, shaking speed, temperature, and reaction time. Dynamic adsorption studies demonstrated the high selectivity of EMMs (MB selectivity was 6.28 times greater than MO), recyclability (effective for 10 cycles), and strong cationic dye affinity (100 %), outperforming the flat sheet membrane (24.1 % higher adsorption capacity). The adsorption followed a Freundlich-like multilayer model and pseudo-second-order kinetics. Thermodynamic analysis revealed spontaneous adsorption at low temperatures, enhancing energy efficiency. In summary, this study offered a sustainable approach for mitigating dye pollution in textile wastewater, aligning with global water conservation efforts.

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表面电荷可切换聚丙烯腈/醋酸纤维素/可溶性蛋壳膜蛋白（PAN/CA/SEP）混合基质膜去除亚甲基蓝

纺织工业每年消耗超过70万吨合成染料，产生对环境有害的染料污染废水。因此，本研究探讨了电纺丝微纤维膜（EMMs）用于染料修复的潜力。在本研究中合成了两种类型的膜：一种是平板膜（对照），一种是微纤维膜，其表面具有ph敏感的电荷开关，用于增强对亚甲基蓝（MB）和甲基橙（MO）的吸附。这种微纤维膜是通过直接写入静电纺丝（DWES）技术制造的，使用的是一台配备了30 kV直流（DC）电源的改良3D打印机，形成了独特的三角形孔网络。静电纺丝溶液由聚丙烯腈（PAN）、醋酸纤维素（CA）和可溶性蛋壳膜蛋白（SEP）组成，并在表面接枝多巴胺（PDA）以引入pH敏感性。一般来说，emm具有高表面积、孔隙度、机械坚固性和可控制的润湿性，是去除染料的理想膜。表征证实了良好的孔隙网络，表面电荷迁移，高热稳定性和优异的渗透率。批量吸附实验表明，在MB浓度、振荡速度、温度和反应时间的影响下，吸附量为21.80 mg/g。动态吸附研究表明，EMMs具有高选择性（MB选择性是MO的6.28倍）、可回收性（10次循环有效）和强阳离子染料亲和性（100 %），优于平板膜（24.1% %的高吸附容量）。吸附遵循类似freundlich的多层模型和准二级动力学。热力学分析表明，在低温下自发吸附，提高了能效。总之，本研究为减轻纺织废水中的染料污染提供了一种可持续的方法，与全球节水努力保持一致。

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

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.