Mechanistic insight of the formation of visible-light responsive nanosheet graphitic carbon nitride embedded polyacrylonitrile nanofibres for wastewater treatment
Mechanistic insight of the formation of visible-light responsive nanosheet graphitic carbon nitride embedded polyacrylonitrile nanofibres for wastewater treatment
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DOI：
10.1016/j.jwpe.2019.101015
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发表时间：
2020-02-01
影响因子：
7
通讯作者：
Aziz, F.
中科院分区：
文献类型：
--
作者：
Alias, Nur Hashimah;Jaafar, Juhana;Aziz, F.
亚甲基蓝（MB）染料的有效捕获和原位光降解是净化含MB废水的一种有前景的技术。随着近期对石墨相氮化碳（g - C3N4）研究发现的不断涌现，本研究探讨了g - C3N4对MB光降解的性能。在本研究中，利用静电纺丝技术成功制备了嵌入g - C3N4光催化剂的聚丙烯腈（PAN）纳米纤维，该技术制备出了可渗透液体的自支撑光催化纳米纤维垫，且易于操作。采用一种绿色简便的无模板方法，以尿素为原料合成了不同结构的g - C3N4，即块状g - C3N4（bg - C3N4）和纳米片g - C3N4（nsg - C3N4）。g - C3N4纳米纤维在可见光照射下对MB的降解率达到97.3%，证实了其有效的光催化活性。g - C3N4纳米纤维对水溶液中MB的光降解主要归因于PAN纳米纤维对MB的吸附以及g - C3N4光催化剂对MB的光催化降解的协同作用。本研究工作不仅提出了制备g - C3N4纳米纤维光催化剂的最简单的环保且经济的方法，还为这种先进的光催化剂在工业MB废水处理的环境修复方面的巨大潜力开辟了新的机遇。
Effective capture and in situ photodegradation of methylene blue (MB) dye is a promising technique to purify wastewater containing MB. With recently elicited ripples of discovery on graphitic carbon nitride (g-C3N4), this study investigates the performance of g-C3N4 on photodegradation of MB. In this study, polyacrylonitrile (PAN) nanofibres embedded with g-C3N4 photocatalyst was successfully prepared using electrospinning technique which produced liquid-permeable self-supporting photocatalytic nanofibre mats that can be handled easily. Different configurations of g-C3N4 were synthesised, bulk g-C3N4 (bg-C3N4) and nanosheets g-C3N4 (nsg-C3N4) from urea using a green facile template-free method. Effective photocatalytic activity of the g-C3N4 nanofibres was confirmed by 97.3% degradation of MB under visible light irradiation. Photodegradation of MB in aqueous solution by g-C3N4 nanofibres predominantly attributed to the synergetic effects of MB adsorption by PAN nanofibres and photocatalytic degradation of MB by g-C3N4 photocatalyst. This present work not only presents the simplest ecofriendly and economical approach to fabricate g-C3N4 nanofibre photocatalyst, but also paves new opportunities for this advanced photocatalyst as great potential in environmental remediation for treatment of industrial MB wastewater.