化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (2) : 267-271.

开发与应用

改性类石墨相氮化碳复合催化剂可见光催化还原水中Cr⁶⁺的研究

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Research on modified g-C₃N₄ photocatalytic reduction of Cr⁶⁺ under visible light irradiation

Li Jinying^1,2, Sun Haifeng^1,3, Zhao Xu^1,4, Yang Chunwei^1,3

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文章历史 +

Received		Published
2019-07-26		2020-02-20
Issue Date	Revised Date
2020-03-02	2019-07-26

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摘要

Cr⁶⁺是高毒性重金属污染物,一般采取还原而降低毒性的方法对其进行处置。光催化还原技术以其经济实用性、简单易操作等优点,成为处理Cr⁶⁺具有应用前景的方法之一。将类石墨相氮化碳 (g-C₃N₄)纳米片 (g-NCN)进行苝四羧酸二酰亚胺 (PTCDA)修饰,成功制备具有可见光响应的PI-g-NCN光催化剂。PI-g-NCN在波长大于420nm可见光条件下可高效光催化还原Cr⁶⁺,在5% PI-g-NCN催化剂投加量1g/L、甲醇体积比浓度为3%的反应条件下,100mg/L Cr⁶⁺ 60min内还原率达100%,反应过程遵循准一级动力学规律。PI-g-NCN光催化剂具有较好的稳定性,循环反应4次,其Cr⁶⁺还原率仍可达99.34%。

Abstract

Cr⁶⁺ is a high toxicity heavy metal pollutant in the wastewater which is usually reducing toxicity firstly by reduction process.Photocatalytic technology is one of the most promising methods for the treatment of Cr⁶⁺ pollution due to its advantages of economy,simplicity and easy operation.Graphite-like carbon nitride (g-C₃N₄) ultra-thing nanosheets (g-NCN) was modified by perylene tetracarboxylic acid diamide (PTCDA).Then,the novel photocatalyst (PI-g-NCN) with visible light response was successfully obtained.It was also studied that the reduction of Cr⁶⁺ by PI-g-NCN under visible light with wavelength greater than 420nm.The results showed that 5% PI-g-NCN could efficiently photocatalytically reduce Cr⁶⁺.Under the conditions of 1g/L catalyst and 3% methanol concentration,the reduction rate of 100mg/L Cr⁶⁺ could reach 100% within 60min.The reaction process followed the pseudo-first order kinetic model.The PI-g-NCN photocatalyst had good stability,and the Cr⁶⁺ reduction rate can still reach 99.34% after 4 cycle reactions.

关键词

光催化 / 石墨相氮化碳 / 苝四羧酸二酐 / Cr⁶⁺

Key words

photocatalysis / graphite phase carbon nitride g-C₃N₄ / perylene tetracarboxylic dianhydride / Cr⁶⁺

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改性类石墨相氮化碳复合催化剂可见光催化还原水中Cr⁶⁺的研究[J]. 化工新型材料, 2020, 48(2): 267-271 DOI:

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