涂层技术对用于膜蒸馏的 MoS2-TiO2/PVDF-PES 的理化性质和结构的影响

IF 2.8 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Journal of chemical technology and biotechnology Pub Date : 2024-05-27 DOI:10.1002/jctb.7679
Nurul Syazana Fuzil, Nur Hidayati Othman, Nur Hashimah Alias, Muhammad Shafiq Mat Shayuti, Munawar Zaman Shahruddin, Fauziah Marpani, Woei Jye Lau, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Tutuk Djoko Kusworo, Sumaiya Zainal Abidin, Anwar Ul-Hamid, Norazah Abd Rahman
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引用次数: 0

摘要

背景用于海水淡化的膜蒸馏(MD)会因孔隙润湿而遇到重大障碍,导致渗透通量降低或渗透液质量随时间推移而下降。因此,用于 MD 的膜必须具有高度疏水性,以防止液体进入孔隙并污染渗透流。在本研究中,使用聚(DOPA)作为粘合剂涂覆了一层薄薄的 MoS2-TiO2 复合材料,以增强附着力。结果有趣的是,这项研究发现,增加浸渍周期的次数可提高通量,这与传统的预期不同。这一意想不到的结果很可能是由于较厚的涂层产生了更疏水的表面,减少了水分子的附着力并阻止了湿润。因此,尽管膜的厚度增加了,但通量却提高了。在测试的膜中,使用分层法涂覆的 MoS2-TiO2/PVDF-PES 膜性能最佳,通量达到 2.06 kg m-2 h-1,盐排斥率达到 99.99%。这种优异的性能还归功于膜的疏水特性,其水接触角(WCA)为 99°。相比之下,交联法的性能较低,渗透通量为 1.70 kg m-2 h-1,盐排斥率为 99.96%,这可能是其较低的 WCA(86°)造成的。© 2024 化学工业学会(SCI)。
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Effects of coating technique on the physicochemical properties and structure of MoS2-TiO2/PVDF-PES for membrane distillation application

BACKGROUND

Membrane distillation (MD) for desalination encounters significant hurdles as a result of pore wetting, leading to reduced permeate flux or deterioration in permeate quality over time. Therefore, membranes used in MD must be highly hydrophobic to prevent liquid from entering the pores and contaminating the permeate stream. In this study, a thin layer of MoS2-TiO2 composite was coated using poly (DOPA) as an adhesive to enhance attachment. Two coating methods, interlinking and layering, were compared to determine the most effective method for forming a thin hydrophobic coating layer onto PVDF-PES hollow fiber membrane.

RESULTS

Interestingly, this study revealed that increasing the number of dipping cycles led to higher flux, defying conventional expectations. This unexpected outcome is likely to have resulted from the thicker coatings creating a more hydrophobic surface, reducing water molecule adhesion and preventing wetting. Consequently, the membrane demonstrated enhanced flux despite its increased thickness. Among the membranes tested, the MoS2-TiO2/PVDF-PES membrane coated using the layering method exhibited the best performance, leading to a flux of 2.06 kg m−2 h−1 and 99.99% salt rejection. This superior performance can also be attributed to the membrane's hydrophobic properties, evident in its water contact angle (WCA) of 99°. By contrast, the interlinking method resulted in lower performance, with a permeate flux of 1.70 kg m−2 h−1 and 99.96% salt rejection, which is likely to have resulted from its lower WCA of 86°.

CONCLUSION

The findings from this study suggest that the coating method has the potential to greatly improve membrane distillation performance through wettability modification rather than altering membrane porosity. © 2024 Society of Chemical Industry (SCI).

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来源期刊
CiteScore
7.00
自引率
5.90%
发文量
268
审稿时长
1.7 months
期刊介绍: Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.
期刊最新文献
Issue Information In Focus: Materials and the Environment Symposium (XXXI IMRC México) Issue Information Adsorption behavior of graphite‐like walnut shell biochar modified with ammonia for ciprofloxacin in aqueous solution Eco‐friendly approaches for synthesis of indolyl 1H‐pyrroles using rice‐husk‐derived carbonaceous sulfonation as the green catalyst
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