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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (3): 476-484    DOI: 10.3785/j.issn.1008-973X.2022.03.006
机械工程、能源工程     
ZnO/g-C3N4光催化剂在微流控芯片中的光催化性能
刘桦珍(),周昊*()
浙江大学 能源清洁利用国家重点实验室，浙江 杭州 310027
Photocatalytic performance of ZnO/g-C3N4 composite photocatalysts in microfluidic reactors
Hua-zhen LIU(),Hao ZHOU*()
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：

采用浸渍法合成ZnO质量分数不同的ZnO/g-C3N4复合光催化剂，分析样品的结构、形态、化学组成和光学性能等. 将制备好的样品固定到微流控芯片中，降解不同的染料（亚甲基蓝、中性红、孔雀石绿、罗丹明B），评价样品在可见光下的光催化性能. 样品的表征结果表明，在ZnO/g-C3N4复合物中，ZnO、g-C3N4间存在相互作用，ZnO/g-C3N4复合物对可见光的利用更为充分；与g-C3N4相比，在ZnO/g-C3N4复合物中光生电子-空穴对的复合明显被抑制. 光催化实验结果表明，6 % ZnO/g-C3N4具有最佳光催化性能，在光照强度为60 klx，液体流速为20 μL/min时，其对罗丹明B溶液的降解效率为98.9%.多次循环后的光催化降解亚甲基蓝性能研究表明，样品在微流控芯片中进行光催化降解实验具有稳定性和可靠性.
关键词： ZnO/g-C3N4复合材料;  光催化技术;  微流控芯片;  降解染料    
Abstract:

The ZnO/g-C3N4 composite photocatalysts with different mass fractions of ZnO were synthesized by a simple impregnation method. The structure, morphology, chemical compositions and optical properties of the samples were analyzed. The as-prepared samples were fixed to microfluidic reactors, respectively. The photocatalytic performance of these reactors was evaluated by the degradation of different dyes (methylene blue, neutral red, malachite green, and rhodamine B) under visible light. The characterization indicated that there was an interaction between ZnO and g-C3N4 in the as-prepared composite. And the composite could make good use of visible light. Also, compared with g-C3N4, the recombination of photogenerated electron-hole pairs in the composite was obviously inhibited. The results of photocatalytic experiments displayed that 6% ZnO/g-C3N4 exhibited the best photocatalytic performance compared to other mass fractions of ZnO. When the light intensity was 60 klx and the liquid flow rate was 20 μL/min, the degradation efficiency of rhodamine B solution reached 98.9%. The photocatalytic degradation of methylene blue by multiple cycle tests was also studied, indicating the sample's stability and reliability when conducting photocatalytic degradation experiments in microfluidic reactors.
Key words: ZnO/g-C3N4 composite    photocatalytic technology    microfluidic reactor    degradation of dye
收稿日期: 2021-03-26 出版日期: 2022-03-29
CLC:  X 703  
基金资助: 国家自然科学基金创新研究群体项目(51621005)
通讯作者: 周昊     E-mail: 21827029@zju.edu.cn;zhouhao@zju.edu.cn
作者简介: 刘桦珍（1997—），女，硕士生，从事微流控芯片中的光催化反应研究. orcid.org/0000-0003-2149-0232.E-mail： 21827029@zju.edu.cn
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引用本文:

刘桦珍,周昊. ZnO/g-C3N4光催化剂在微流控芯片中的光催化性能[J]. 浙江大学学报(工学版), 2022, 56(3): 476-484.

Hua-zhen LIU,Hao ZHOU. Photocatalytic performance of ZnO/g-C3N4 composite photocatalysts in microfluidic reactors. Journal of ZheJiang University (Engineering Science), 2022, 56(3): 476-484.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.03.006    或    https://www.zjujournals.com/eng/CN/Y2022/V56/I3/476

图 1  微流控芯片的实物图和微通道的设计图
图 2  微流控芯片的制作过程
图 3  实验系统示意图
图 4  制备的CN, ZnO和ZnO/CN复合物XRD谱图
图 5  CN、ZnO和6% ZnO/CN的SEM图和6% ZnO/CN的EDS图
图 6  CN、ZnO和6% ZnO/CN光催化剂的FT-IR谱图
图 7  CN、ZnO和6% ZnO/CN的高分辨率光谱
图 8  CN、ZnO和6% ZnO/CN复合物的光学性能分析
图 9  激发波长为365 nm时CN、ZnO/CN复合材料的PL谱图
图 10  不同流速下的光催化降解MB性能（光强：50 klx）
图 11  不同光照度下的光催化降解MB性能（流速：20 μL/min）
图 12  光催化降解MB循环实验（光强：60 klx，流速：20 μL/min）
图 13  不同催化剂的光催化降解NR, MG和MB性能（光强：60 klx，流速：20 μL/min）
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