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首页> 外文期刊>RSC Advances >Binding TiO2 nanoparticles to forward osmosis membranes via MEMO-PMMA-Br monomer chains for enhanced filtration and antifouling performance
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Binding TiO2 nanoparticles to forward osmosis membranes via MEMO-PMMA-Br monomer chains for enhanced filtration and antifouling performance

机译：通过Memo-PMMA-BR单体链将TiO2纳米颗粒结合到前渗透膜，以提高过滤和防污性能

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摘要

Forward osmosis (FO) has attracted increasing interest in various applications for water and wastewater treatment and reuse. However, drawbacks caused by its lower-than-expected flux performance and fouling issues remain bottlenecks that limit the wider applications of FO technology. In this research, titanium dioxide (TiO2) nanoparticles were grafted onto two commercially available FO membranes, a cellulose triacetate (CTA) membrane and an aquaporin (AqP) membrane, through a specially designed 3-(trimethoxysilyl)propyl methacrylate-polymethyl methacrylate-bromide (MEMO-PMMA-Br) monomer chain, to improve the filtration performance with regard to pure water flux and organic fouling resistance. The success of the surface coating method was verified using FT-IR, SEM-EDX, and AFM. Approximately 30% titanium coverage was obtained for both FO membranes. A reduction of the contact angle on the modified CTA membrane surface indicated enhanced water permeability and antifouling performance. An adverse effect on the surface hydrophilicity of the modified AqP membrane may be attributed to the obstruction of aquaporins from the feed solution due to the coverage of MEMO-PMMA-Br monomers and TiO2 nanoparticles. The pure water flux of both membranes was significantly improved, with average flux increases of 73.4% and 13.6% identified for the modified CTA and AqP membranes, respectively. In addition, the antifouling performance of the AqP membrane was greatly enhanced after surface modification, attributed to the integrated effects of foulant photodegradation (catalyzed by TiO2 nanoparticles at the interface) and the prevention of functional water channels being blocked by organic foulants due to TiO2 coverage.
机译：前渗透（FO）吸引了对各种应用的越来越兴趣的水和废水处理和重用。然而，由其低于预期的磁通性能和结垢问题引起的缺点仍然是限制FO技术更广泛应用的瓶颈。在这项研究中，二氧化钛（TiO 2）纳米颗粒接枝到两种市售FO膜，三醋酸纤维素（CTA）膜和水通道蛋白（AQP）膜，通过特殊设计的3-（三甲氧基硅基）丙基甲基丙烯酸酯 - 聚甲基丙烯酸甲酯 - 溴化物（备注PMMA-BR）单体链，以改善纯净水通量和有机污垢抗性的过滤性能。使用FT-IR，SEM-EDX和AFM验证表面涂层方法的成功。对于FO膜，获得了大约30％的钛覆盖。改性CTA膜表面上的接触角的降低表示增强的水渗透性和防污性能。由于备注-PMMA-BR单体和TiO2纳米颗粒的覆盖，对改性的AQP膜的表面亲水性的不良反应可能归因于来自饲料溶液的水素阻塞。两种膜的纯净水通量显着改善，平均通量分别为改性CTA和AQP膜鉴定为73.4％和13.6％。此外，表面改性后，AQP膜的防污性能大大提高，归因于污垢光降解的综合影响（在界面处的TiO2纳米粒子催化），并且防止由于TiO2覆盖率被有机污垢阻挡的功能水通道。

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  • 来源
    《RSC Advances》 |2018年第34期|共10页
  • 作者

    Xue Wenchao; Sint Kaung Ko Ko; Ratanatamskul Chavalit; Praserthdam Piyasan; Yamamoto Kazuo;

  • 作者单位

    Chulalongkorn Univ Dept Environm Engn Fac Engn 254 Phayathai Rd Bangkok 10330 Thailand;

    Chulalongkorn Univ Dept Environm Engn Fac Engn 254 Phayathai Rd Bangkok 10330 Thailand;

    Chulalongkorn Univ Dept Environm Engn Fac Engn 254 Phayathai Rd Bangkok 10330 Thailand;

    Chulalongkorn Univ Dept Chem Engn Fac Engn 254 Phayathai Rd Bangkok 10330 Thailand;

    Asian Inst Technol Dept Energy Environm &

    Climate Change Sch Environm Resources &

    Dev Pathum Thani 12120 Thailand;

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  • 正文语种 eng
  • 中图分类 化学;
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