In the writing of this graduation t

In the writing of this graduation thesis, first of all, I want to thank my thesis instructor, Huang daozhan, associate professor, and LAN Hongyun for their guiding opinions and recommendations on the research direction of my thesis. In the process of writing this thesis, I have timely pointed out the difficulties and doubts I encountered, put forward many useful suggestions for improvement, and put in a lot of effort and energy. In the process of graduation experiment, Mr. Huo Shangchao, Mr. Zhao Baoning, Mr. Pan Ting and Mr. Ma Jinglan expressed their sincere thanks for my help and care! At the same time, they also thanked the teachers and all the students of Applied Chemistry in the school of chemistry and chemical engineering of Guangxi University for Nationalities for learning from each other, helping each other and having a perfect and unforgettable time together.In addition, I would like to thank my friends and classmates for their great support and help in the preparation of the thesis, which has brought me great inspiration. I also want to thank the authors in the references. Through their research articles, I have a good starting point for the research topic.Finally, thank you for your hard work. I sincerely thank my family, friends and classmates. It was with their encouragement and support that I successfully completed this paper