前驱体法制备BCN及其光催化还原CO_(2)性能  

Preparation of BCN by precursor method andits photocatalytic reduction of CO_(2)

作　　者：卜学琳 曾祥会 陈辉[1] 方伟[1] 杜星[1] 王大珩 何漩[1] 李薇馨 赵雷[1] BU Xuelin;ZENG Xianghui;CHEN Hui;FANG Wei;DU Xing;WANG Daheng;HE Xuan;LI Weixin;ZHAO Lei(The State Key Laboratory of Refractories and Metallurgy,Wuhan University ofScience&Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《功能材料》2024年第7期7031-7037,7059,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(22105151,52305211);湖北省重点科研计划项目(2022BAA094);湖北省自然科学基金项目(2023AFB626,2022CFB626,2021CFB469);武汉市知识创新工程项目(2022010801010306);湖北省教育厅科研计划(B2022017);绿色化工过程教育部重点实验室开放项目(GCP2022003);武汉市朝阳青年科技计划(whkx202203);武汉科技大学“十四五”湖北省优势特色学科项目(2023A0305)。

摘　　要：以乙二胺、二乙烯三胺、三乙烯四胺为氮源,以硼酸为硼源制备不同前驱体,通过高温氨解直接合成硼碳氮(BCN-x,分别记为BCN-EDA,BCN-DETA和BCN-TETA)。利用XRD、SEM、TEM、XPS、UV-Vis和PL对其组成、形貌和光学性能进行表征。并在无牺牲剂和助催化剂的条件下,对BCN-x样品的光催化还原CO_(2)性能进行了评估。结果表明,所制备的样品均为片状结构,且BCN-EDA具有较高的结晶度、较好的光生载流子分离效率。所制备的BCN-x可以在350~780 nm可见光照射下将CO_(2)还原为CO和CH_(4),且BCN-EDA表现出最佳的光催化CO_(2)还原性能,CO产量为32.20μmol/g,且在20 h内能保持相当的光催化稳定性。In this paper,ethylenediamine,diethylenetriamine and triethylene tetramine were used as N source and boric acid as B source to prepare different precursors to directly high temperature ammonolysis polymerize borocarbonitrides(BCN-x,recorded as BCN-EDA,BCN-DETA and BCN-TETA,respectively).XRD,SEM,TEM,XPS,UV-Vis,and PL were used to analyze the chemical composition,morphology,and optical properties of samples.And the photocatalytic CO_(2) reduction performance of BCN-x samples was assessed without compromising agents and cocatalysts.The results show that all the prepared samples have lamellar structure,and BCN-EDA represents higher crystallinity and higher photocarrier separation efficiency.Under visible light irradiation at 350-780 nm,the produced BCN-x can reduce CO_(2) to CO and CH_(4),and BCN-EDA has the best photocatalytic CO_(2) reduction performance,with a CO yield of 32.20μmol/g and the photocatalytic stability can be maintained within 20 h.

关 键 词：硼碳氮 光催化CO_(2)还原 光生载流子分离 光催化稳定性 

分 类 号：TQ129[化学工程—无机化工] O643.32[理学—物理化学]