二元碱金属共掺杂石墨相氮化碳的制备及光催化性能评价

doi:10.11896/j.issn.1005-023X.2018.24.002

材料导报

2018, Vol. 32

Issue (24): 4217-4223 https://doi.org/10.11896/j.issn.1005-023X.2018.24.002

无机非金属及其复合材料

二元碱金属共掺杂石墨相氮化碳的制备及光催化性能评价

梁红玉¹, 邹赫¹, 胡绍争¹, 李建中², 田彦文²

1 辽宁石油化工大学化学化工与环境学部,抚顺 113001;
2 东北大学冶金学院,沈阳 110819

Preparation of Alkali Metals Co-doped Graphitic Carbon Nitride by Molten Salt Method and Photocatalytic Performance

LIANG Hongyu¹, ZOU He¹, HU Shaozheng¹, LI Jianzhong², TIAN Yanwen²

1 College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001;
2 School of Metallurgy, Northeastern University, Shenyang 110819

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摘要以三聚氰胺为母体、以双组分碱金属为熔盐制备了钾-钠共掺杂石墨型氮化碳(g-C₃N₄)光催化剂,并用X射线衍射光谱(XRD)、紫外可见光谱(UV-Vis)、N₂吸附脱附、X光电子能谱(XPS)、荧光光谱(PL)等分析手段对产物进行了表征。结果表明,通过改变碱金属熔盐量,能将氮化碳价带(VB)能级从+1.55 V调控到+2.27 V、导带(CB)能级从-1.10 V调控到-0.27 V,同时碱金属的引入抑制了氮化碳晶粒的生长,降低了光生电子-空穴对的复合概率,提高了氮化碳的比表面积以及对可见光的吸收。以罗丹明B(RhB)为目标物研究了系列氮化碳在可见光驱动下的催化能力,实验结果表明,二元碱金属的掺入大大提高了催化剂降解和矿化罗丹明B的能力,并表现出良好的稳定性。

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关键词: 石墨相氮化碳碱金属光催化可见光

Abstract: Alkali metals co-doped graphitic carbon nitride (g-C₃N₄) was prepared using melamine as precursor, KCl and NaCl as molten salts, and characterized by X-ray diffraction (XRD), N₂ adsorption, UV-vis spectroscopy, X-ray photoelectron spectroscopy (XPS), and Photoluminescence (PL). By controlling the weight ratio of eutectic salts to melamine, the VB and CB potentials of prepared g-C₃N₄ could be tuned from +1.55 V and -1.10 V to +2.27 V and -0.27 V, respectively. Besides, the ions embedding inhibited the crystal growth, enhanced the separation rate of photo-generated electrons and holes, and enlarged the surface area. The catalytic abilities of products were investigated by photodegradation and mineralization of Rhodamine (RhB) under visibe light. The results showed that photocatalytic activity and stability of prepared catalysts were significantly improved after alkali metals doping.

Key words: g-C₃N₄ alkali metal photocatalysis visible light

发布日期: 2019-01-23

ZTFLH:	O641
	O649

基金资助: 国家自然科学基金(51374053)

作者简介: 梁红玉:女,1969年生,博士,副教授,研究方向为层状材料(水滑石、石墨型氮化碳等)在绿色能源及环境工程中的应用 E-mail:lianghongyu163@163.com

引用本文:

梁红玉, 邹赫, 胡绍争, 李建中, 田彦文. 二元碱金属共掺杂石墨相氮化碳的制备及光催化性能评价[J]. 材料导报, 2018, 32(24): 4217-4223.
LIANG Hongyu, ZOU He, HU Shaozheng, LI Jianzhong, TIAN Yanwen. Preparation of Alkali Metals Co-doped Graphitic Carbon Nitride by Molten Salt Method and Photocatalytic Performance. Materials Reports, 2018, 32(24): 4217-4223.

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http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.24.002 或 http://www.mater-rep.com/CN/Y2018/V32/I24/4217

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