原卟啉碳点的合成及其在光催化还原CO_(2)/H_(2)O制甲醇中的应用  

Synthesis and application of protoporphyrin carbon dots in photocatalytic reduction of CO_(2)/H_(2)O to methanol

作　　者：党永强[1] 冯香钰 卓东贤 刘国阳[1] 蔡江涛[1] 朱由余 黄瑞 张亚婷[1,2,3] Dang Yong-qiang;Feng Xiang-yu;Zhuo Dong-xian;Liu Guo-yang;Cai Jiang-tao;Zhu You-yu;Huang Rui;Zhang Ya-ting(College of Chemistry and Chemical Engineering,Xi'an University of Science and Technology,Shaanxi Xi'an 710054,China;College of Chemical Engineering and Materials,Quanzhou Normal University,Fujian Quanzhou 362000,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Shaanxi Xi'an 710021,China)

机构地区：[1]西安科技大学化学与化工学院,陕西西安710054 [2]泉州师范学院化工与材料学院,福建泉州362000 [3]自然资源部煤炭资源勘查与综合利用重点实验室,陕西西安710021

出　　处：《炭素技术》2023年第5期48-54,共7页Carbon Techniques

基　　金：陕西省自然科学基础研究计划项目(2022JQ-132);国家自然科学基金青年基金项目(21503164)。

摘　　要：CO_(2)资源化利用是当前能源与环境领域的研究热点,光催化还原CO_(2)作为一种绿色、温和的转化技术备受关注,其中提高光催化转化过程中光利用效率和降低载流子复合速率是促进CO_(2)光催化还原过程的关键。利用柠檬酸、乙二胺和原卟啉为原料,通过一步水热法制备原卟啉碳点,并考察了其光催化还原CO_(2)性能。研究表明,碳点为3.3 nm左右的球形颗粒,原卟啉以共价键的形式成功引入碳点中,并且碳点中保留了原卟啉结构中的共轭大π键的骨架,增强了碳点催化剂对400~500 nm的光的吸收,降低了光催化还原CO_(2)过程中的载流子复合速率。光催化还原CO_(2)性能测试表明,以含有质量分数为1%原卟啉的碳点作为光催化剂转化CO_(2)为CH_(3)OH的产率达到285.5μmol·g~(-1)·h~(-1),是未添加原卟啉催化剂产率的2.16倍。The resource utilization of CO_(2)is a research hotspot in the field of energy and environment at present.Photocatalytic reduc-tion of CO_(2)as a green and mild conversion technology has attracted much attention.Among them,improving the light absorption effi-ciency and reducing the carrier recombination rate are the keys to promote the process of CO_(2)photocatalytic reduction.Using citric acid,ethylenediamine and protoporphyrin as raw materials,protoporphyrin carbon dots(PP-CDs)were prepared by one-step hydro-thermal method,and their photocatalytic reduction of CO_(2)was investigated.The results show that carbon dots are spherical particles with about 3.3 nm.Protoporphyrin was successfully introduced into CDs in the form of covalent bond and retained the conjugated large T bond skeleton of the protoporphyrin structure in the CDs,which enhanced the absorption of the sunlight at 400~500 nm of the CDs photocatalyst and reduced the carrier recombination rate in the photocatalytic reduction of CO_(2).The performance test of photocatalytic reduction of CO_(2)shows that the conversion rate of CO_(2)to CH_(3) OH is 285.5μmol·g^(-1)·h^(-1) using carbon dots containing 1%protoporphy-rin as photocatalyst,with 2.16 times the yield of the catalyst without protoporphyrin.

关 键 词：碳点 原卟啉 光催化 CO_(2)还原 甲醇 

分 类 号：O613.71[理学—无机化学]