采用水热法将分子筛MCM-41与光催化剂NH₂-MIL-101(Fe)复合制备了MCM-41/NH₂-MIL-101(Fe)复合光催化剂(NMM),用于光催化还原CO₂。借助XRD、BET、SEM-EDS、UV-Vis DRS、PL、XPS等分析手段对催化剂的微观结构进行详细的分析和表征,解析了催化剂理化性质对催化活性的影响,明确了在NH₂-MIL-101(Fe)催化剂中掺杂MCM-41对CO₂还原为甲酸产量提升有积极作用。实验结果表明,在光照5 h后,在水溶液中未添加牺牲剂的条件下,10% MCM-41添加量的10% NMM将CO₂还原为甲酸的产量为109.11 μmol/g,是纯NH₂-MIL-101(Fe)的5倍(21.78 μmol/g);添加牺牲剂TEOA后10% NMM的甲酸产量为132.78 μmol/g,是纯NH₂-MIL-101(Fe)的4倍(33.67 μmol/g)。催化剂在2种溶液体系中重复使用3次后,仍保持很高的催化活性。

MCM-41 molecular sieve is mixed with NH₂-MIL-101(Fe),a MOF photocatalyst,to prepare MCM-41/NH₂-MIL-101(Fe) (NMM) composite photocatalyst through a hydrothermal method,which is used for photocatalytic reduction of CO₂.The microstructure of the prepared composite photocatalyst is characterized by means of XRD,BET,SEM-EDS,UV-Vis DRS,PL,XPS and other analytical tools,the influence of the physicochemical properties of the catalyst on the catalytic activity is resolved.The doping of MCM-41 on NH₂-MIL-101(Fe) leads to a positive effect on the enhancement of CO₂ reduction to HCOOH.Experimental results show that HCOOH yield reaches 109.11 μmol·g^-1 after 5 h of light exposure over 10%-NMM catalyst in water solution without sacrificial agent added,which is around five times that over pure NH₂-MIL-101(Fe).HCOOH yield over 10%-NMM with TEOA as sacrificial agent reaches 132.78 μmol·g^-1,which is 4 times that (33.67 μmol·g^-1) over pure NH₂-MIL-101(Fe).The prepared photocatalyst remains high catalytic activity after it has been used for 3 times recycle in both solvent systems.

江雨婷(1997-),女,硕士生,研究方向为光催化材料,ytjiang1116@163.com;张琳萍(1973-),女,博士,教授,主要从事无机功能材料的合成及性能研究,通讯联系人,zhang_lp@dhu.edu.cn。