Cu重建凹凸棒石原位固载CuO量子点及其宽光谱固氮特性  

In Situ Growth of CuO Quantum Dots on Cu-Reconstructed Palygorskite for Wide-Spectrum Photocatalytic Nitrogen Fixation

作　　者：杨松[1] 储悉尼 李文俊 何承溧 业绪华[1] 吴凤芹[1] 李霞章[1,2] YANG Song;CHU Xini;LI Wenjun;HE Chengli;YE Xuhua;WU Fengqin;LI Xiazhang(Advanced Catalysis and Green Manufacturing Collaborative Innovation Center,Changzhou University,Changzhou 213164,Jiangsu,China;Key Laboratory of Clay Mineral Applied Research of Gansu Province,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]常州大学,江苏省先进催化与绿色制造协同创新中心,江苏常州213164 [2]中国科学院兰州化学物理研究所,甘肃省应用黏土矿物重点实验室,兰州730000

出　　处：《硅酸盐学报》2021年第10期2070-2077,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51674043);甘肃省应用黏土矿物重点实验室开放课题(CMAR-2020-2)。

摘　　要：通过水热法用Cu^(2+)置换酸活化凹凸棒石黏土(Pal)八面体阳离子实现晶格重建(Cu-Pal),过量的Cu^(2+)经过溶液pH值调变和煅烧后,在Cu-Pal表面原位生长出氧化铜量子点(CuO QDs),从而制备出CuO QDs/Cu-Pal纳米复合材料,并将其应用于光催化固氮,考察了Cu^(2+)用量对凹凸棒石微观形貌、光学性质和能带结构的影响。结果表明:Cu-Pal具有更窄的带隙,将光响应范围从紫外光拓展到可见光。当Cu^(2+)含量超过5%(质量分数)时,Cu-Pal表面的CuO QDs由于窄带隙(1.2 eV)增强了近红外光的吸收。20%含量下Cu-Pal纳米复合材料形成最匹配的Type-Ⅰ异质结构,有效促进了光生载流子的分离,显著提高了光催化固氮性能。Octahedral cations of acid-treated palygorskite clay(Pal)were partially replaced by Cu^(2+) via hydrothermal method to achieve lattice reconstruction(Cu-Pal).CuO quantum dots(CuO QDs)were grown in situ on the surface of Cu-Pal by adjust the pH and thermal treatment in case of excess Cu^(2+),which led to the formation of CuO QDs/Cu-Pal nanocomposite toward photocatalytic nitrogen fixation.The influence of Cu^(2+) content on the microstructure,optical property and band gap structure of Pal were studied.Results showed that the Cu substitution narrowed the band gap of Pal which extended the light response range from ultraviolet light to visible light.When the Cu^(2+) content exceeded 5%(in mass fraction),CuO QDs on the Cu-Pal surface effectively promoted the absorption of NIR light due to its rather low band gap(1.2 eV).20% Cu-Pal formed the best-matched Type-Ⅰ heterostructure and demonstrated the highest photocatalytic nitrogen fixation performance due to the enhanced charge separation.

关 键 词：凹凸棒石 晶格重建 氧化铜 量子点 异质结 光催化固氮 

分 类 号：TB332[一般工业技术—材料科学与工程]