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

• 新型功能材料 • 上一篇    下一篇

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. 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. 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: 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

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