化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (5) : 212-217. DOI: 10.19817/j.cnki.issn1006-3536.2022.05.043

科学研究

g-C₃N₄-TiO₂纳米复合材料的制备及光催化降解甲基蓝

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Preparation of g-C₃N₄/TiO₂ nanocomposite for MB photocatalytic degradation

Cang Jinshun¹, Xue Wen², Zhang Yuheng², Zhu Xiashi²

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Received
2022-01-03
Issue Date	Revised Date
2022-06-06	2022-01-03

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摘要

通过原位热聚合策略,在石墨化氮化碳(g-C₃N₄)表面负载上TiO₂纳米颗粒,制备了g-C₃N₄-TiO₂纳米复合材料。研究加入不同量尿素前驱体对纳米复合材料形貌、晶型结构、化学组成、光吸收能力、电荷转移能力以及光催化能力的影响。结果表明:TiO₂纳米颗粒均匀负载在g-C₃N₄表面,且界面间结合紧密。g-C₃N₄的负载能显著地提高纳米复合材料的电荷转移和吸收可见光的能力。在最优合成条件下制备的g-C₃N₄-TiO₂纳米复合材料TCN-3(TiO₂∶尿素=1∶3)作为光催化剂,紫外光照射120min、可见光照射150min对甲基蓝的降解率分别达到98%和99%,连续使用15h未出现明显的性能衰退现象,这也说明g-C₃N₄-TiO₂具有良好的结构、稳定的光催化性能和很好的实际应用价值。

Abstract

The g-C₃N₄-TiO₂ nanocomposites were prepared by TiO₂ nanoparticles on the surface of graphitization of carbon nitride (g-C₃N₄) via in-situ thermal polymerization.The effects of different dosage of urea precursors on the morphology,crystal structure,chemical composition,light absorption capacity,charge transfer capacity and photocatalytic capacity of the nanocomposites were studied.The characterization of its morphology and structure showed that TiO₂ nanoparticles was closely bonded on the surface of g-C₃N₄.Moreover,the loading of g-C₃N₄ also significantly improved the visible light absorption and charge transfer ability of the nanocomposites.Under the optimal conditions,the degradation rate of methyl blue(MB) with TCN-3 reached 98% under ultraviolet irradiation for 120min,and 99% under visible irradiation for 150min.The properties of the nanocomposite did not deteriorate significantly after continuous use for 15h,which proved that the nanocomposite had good structure and stable catalytic performance,thus possessing strong application value.

关键词

光催化 / 甲基蓝 / 异质结 / 二氧化钛 / 氮化碳

Key words

photocatalysis / methyl blue / heterojunction / titanium dioxide / carbon nitride

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g-C₃N₄-TiO₂纳米复合材料的制备及光催化降解甲基蓝[J]. 化工新型材料, 2022, 50(5): 212-217 DOI:10.19817/j.cnki.issn1006-3536.2022.05.043

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