化工进展 ›› 2021, Vol. 40 ›› Issue (2): 908-916.DOI: 10.16085/j.issn.1000-6613.2020-0647

• 工业催化 • 上一篇    下一篇

碳量子点修饰g-C3N4/SnO2复合材料光催化性能

何源1,2(), 许磊1,4(), 夏仡3, 王学谦2, 刚瑞奇1, 王郎郎2   

  1. 1.昆明理工大学冶金与能源工程学院,云南 昆明 650093
    2.昆明理工大学环境科学与工程学院,云南 昆明 650093
    3.昆明理工大学分析测试中心,云南 昆明 650093
    4.云南省部共建复杂有色金属资源清洁利用国家 重点实验室,云南 昆明 650093
  • 收稿日期:2020-04-23 修回日期:2020-06-11 出版日期:2021-02-05 发布日期:2021-02-09
  • 通讯作者: 许磊
  • 作者简介:何源(1994—),男,硕士研究生,研究方向为光催化降解有机染料。E-mail:1534096669@qq.com
  • 基金资助:
    国家自然科学基金(51864030);云南省科技人才计划(2019HB003);云南省万人计划青年拔尖人才;云南省重大科技专项(2018ZE027);昆明理工大学自然科学基金(KKSY201732033)

Photocatalytic performance of carbon quantum dots modified g-C3N4/SnO2 composites

Yuan HE1,2(), Lei XU1,4(), Yi XIA3, Xueqian WANG2, Ruiqi GANG1, Langlang WANG2   

  1. 1.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    2.Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    3.Kunming University of Science and Technology Analysis and Testing Center, Kunming 650093, Yunnan, China
    4.State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization in Yunnan Province, Kunming 650093, Yunnan, China
  • Received:2020-04-23 Revised:2020-06-11 Online:2021-02-05 Published:2021-02-09
  • Contact: Lei XU

摘要:

以四氯化锡五水合物、乙二醇和氨水为原料,在微波辅助水热条件下快速合成氧化锡纳米颗粒,以尿素 为前体在马弗炉中退火得到g-C3N4,使用柠檬酸和乙二胺为原料水热合成碳量子点。室温下,将碳量子点/ g-C3N4/SnO2在通风橱中进行搅拌得到碳量子点负载的氮化碳/氧化锡复合材料。通过透射电子显微镜(TEM)、 X射线衍射(XRD)、氮气吸附-解吸等温线(BET)、紫外-可见分光光度计(UV-vis)、电子自旋(顺磁)共振波谱仪(ESR)对复合材料的形貌、结构特征、吸光度和光催化过程中的活性物质等进行表征和分析,并通过在紫外光下降解罗丹明B(RhB)测试样品的光催化性能。试验结果表明,紫外-可见分光光谱吸收边缘的红移说明碳量子点负载后能提高复合材料在可见光区域的响应,光催化试验表明碳量子点负载能提高g-C3N4/SnO2复合材料的光催化性能,当碳量子点负载量为7%时复合材料的降解效率最高,在3h内对RhB的降解效率为97%。此外,微波辅助水热法能在短时间内大量合成氧化锡纳米颗粒,且氧化锡纳米颗粒具有较小的晶粒尺寸(8.5nm),可以高效制备并应用于环保领域。

关键词: 碳量子点, 氮化碳/氧化锡, 复合材料, 光催化, 降解

Abstract:

Using tin tetrachloride pentahydrate, ethylene glycol and ammonia as raw materials, tin oxide nanoparticles were rapidly synthesized under microwave-assisted hydrothermal conditions. Urea was used as a precursor to obtain g-C3N4 in a muffle furnace. Hydrocarbon-synthesized carbon quantum dots were prepared from citric acid and ethylenediamine, and finally stirred in a fume hood to obtain carbon quantum dot-loaded carbon nitride/tin oxide composites. TEM, X-ray diffraction (XRD), nitrogen adsorption-desorption isotherm (BET), ultraviolet-visible spectrophotometer (UV-vis) and electron spin (paramagnetic) resonance spectrometer (ESR) were used to characterize the morphology, structural characteristics, absorbance of the composite and characterization and analysis of active substances in the process of photocatalysis. The photocatalytic performance of the samples was tested by degrading rhodamine B (RhB) under ultraviolet light. The experimental results found the red shift of the absorption edge of the ultraviolet-visible spectroscopic spectrum, indicating that the loaded carbon quantum dots can improve the response of the composite in the visible light region. The photocatalytic experiments showed that the loaded carbon quantum dots can improve the photocatalysis of the g-C3N4/SnO2 composite performance. When the load of carbon quantum dots was 7%, the degradation efficiency of composites was the highest and the degradation efficiency of RhB under 3h was 97%. In addition, the microwave-assisted hydrothermal method can synthesize a large amount of tin oxide nanoparticles in a short time and the tin oxide nanoparticles had a small grain size (8.5nm), which can be efficiently prepared and applied in the field of environmental protection.

Key words: carbon quantum dots, g-C3N4/SnO2, composites, photocatalytic, degradation

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