SiO2/g-C3N4复合粉体制备及其光催化性能

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (8): 2748-2754.

SiO₂/g-C₃N₄复合粉体制备及其光催化性能

徐泽忠¹, 邹慧¹, 曹显志², 吴阳³, 韩成良⁴

1.合肥学院分析测试中心,合肥 230601;
2.东南大学材料科学与工程学院,南京 211189;
3.浙江工业大学化学工程学院,杭州 310006;
4.合肥学院能源材料与化工学院,合肥 230601

收稿日期:2021-03-04 修回日期:2021-05-24 出版日期:2021-08-15 发布日期:2021-09-02
作者简介:徐泽忠(1981—),男,实验师。主要从事环境纳米材料及表征方面的研究。E-mail:xuzz@hfuu.edu.cn
基金资助:
2018年合肥学院自然科学发展基金重点项目(18ZR08ZDB)

Synthesis and Photocatalytic Properties of SiO₂/g-C₃N₄ Composite Powders

XU Zezhong¹, ZOU Hui¹, CAO Xianzhi², WU Yang³, HAN Chengliang⁴

1. Analysis and Testing Center of Hefei University, Hefei 230601, China;
2. College of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
3. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310006, China;
4. Department of Chemical and Materials Engineering, Hefei University, Hefei 230601, China

Received:2021-03-04 Revised:2021-05-24 Online:2021-08-15 Published:2021-09-02

摘要/Abstract

摘要： 以Stöber法制备出的二氧化硅(SiO₂)微球和三聚氰胺为原料,两者按一定质量比混合后得到前驱体,通过煅烧该前驱体可成功获得SiO₂/g-C₃N₄复合粉体。利用XRD、SEM、UV-Vis和BET等表征手段对获得的复合粉体进行物相组成、形貌、可见光吸收性能以及比表面积大小等进行分析和测试。结果表明,改进的Stöber法制备出的球形SiO₂平均粒径约为200 nm,具有良好的分散性。SiO₂/g-C₃N₄复合粉体中SiO₂含量约为75%(质量分数)时,其比表面积最大,约为23.7 m²/g。同时,以罗丹明B和亚甲基蓝为目标污染物,在可见光照射下,探究了不同g-C₃N₄负载量SiO₂/g-C₃N₄复合粉体的光催化性能。结果表明,随着复合粉体中g-C₃N₄含量的降低,复合粉体的可见光催化活性反而逐渐升高,g-C₃N₄含量约为25%(质量分数)时复合粉体光催化降解罗丹明B和亚甲基蓝效果最好。原因可归结为,复合粉体的强吸附增强了可见光催化性能。

关键词: SiO₂/g-C₃N₄复合粉体, 光催化, Stöber法, 吸附

Abstract: SiO₂/g-C₃N₄ composite powders were successfully prepared by calcination of proper as-prepared silicon dioxide (SiO₂) and melamine (C₃H₆N₆) composite precursors. The phase composition, morphology,optical absorption performance, and specific surface area of the composite powders were carried out by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), ultraviolet-visible light absorption spectrum (UV-Vis) andBET method. Results show that the average particle size of spherical SiO₂ prepared by modified Stöber method is about 200 nm and it has good dispersibility. When the content of SiO₂ is about 75% (mass fraction) in SiO₂/g-C₃N₄ composite powder, the specific surface area of composite powder is the largest, about 23.7 m²/g. At the same time, the photocatalytic properties of SiO₂/g-C₃N₄ composite powders with different g-C₃N₄ loading content were investigated under visible light irradiation with Rhodamine B and methylene blue as the target pollutants. Results indicate that with the decrease of the content of g-C₃N₄ in the composite powders, the visible light activity of the composite powder increases gradually. The composite powder with about 25% (mass fraction) g-C₃N₄ has the best photocatalytic degradation effect on Rhodamine B and methylene blue. The reason is that the strong absorption of composite powders enhances the visible light photocatalytic property.

Key words: silicon dioxide/graphitic carbon nitride composite powder, photocatalysis, Stöber method, absorption

中图分类号:

TQ034

徐泽忠, 邹慧, 曹显志, 吴阳, 韩成良. SiO₂/g-C₃N₄复合粉体制备及其光催化性能[J]. 硅酸盐通报, 2021, 40(8): 2748-2754.

XU Zezhong, ZOU Hui, CAO Xianzhi, WU Yang, HAN Chengliang. Synthesis and Photocatalytic Properties of SiO₂/g-C₃N₄ Composite Powders[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2748-2754.

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SiO₂/g-C₃N₄复合粉体制备及其光催化性能

Synthesis and Photocatalytic Properties of SiO₂/g-C₃N₄ Composite Powders

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