ZIF-8制备原位碳掺杂氧化锌及其光催化性能研究
收稿日期: 2021-04-17
网络出版日期: 2022-03-14
Study on in situ preparation of C-doped ZnO by ZIF-8 and its photocatalytic properties
Received date: 2021-04-17
Online published: 2022-03-14
以ZIF-8为前驱体,采用热解法制备碳掺杂氧化锌。分别研究ZIF-8在350、400、450 ℃下煅烧以及陈化10 min、3 h、24 h对制备原位碳掺杂氧化锌的影响。通过热重（TG）、X射线衍射（XRD）和扫描电镜（SEM）研究样品的形貌和结构;紫外可见漫反射光谱（UV-vis）和光致发光光谱（PL）证明原位碳掺杂氧化锌具有可见光吸收能力和更低的光生载流子复合率;DFT模拟计算表明氧化锌晶格中掺入碳元素能有效减小带隙值。原位碳掺杂氧化锌较纯氧化锌在可见光和紫外光照射下的光催化性能分别提高1.5倍和3.0倍。空穴和羟基自由基是原位碳掺杂氧化锌光催化降解体系的主要活性基团,并由此提出了碳掺杂氧化锌的光催化机理。
左龙涛 , 李军 , 金央 , 班昌胜 , 陈明 . ZIF-8制备原位碳掺杂氧化锌及其光催化性能研究[J]. 无机盐工业, 2022 , 54(1) : 101 -108 . DOI: 10.19964/j.issn.1006-4990.2021-0252
The C-doped ZnO was prepared by pyrolysis using ZIF-8 as the precursor.In addition,the effect of calcination at 350,400,450 ℃ and aging for 10 min,3 h,24 h of ZIF-8 on in situ preparation of C-doped ZnO were investigated,re-spectively.The morphology and structure of in situ C-doped ZnO was investigated by thermogravimetric（TG）,X-ray diffrac-tion（XRD） and scanning electron microscopy（SEM）.Moreover,the light absorption ability and the dynamics of charge carrier were studied by the UV-vis diffuse reflectance spectra（UV-vis） and photoluminescence spectra（PL） which demonstrated the in situ C-doped ZnO had visible light absorption ability and lower recombination rate of photogenerated carriers.DFT sim-ulation showed that the bandgap value could be effectively reduced by doping C element in the ZnO lattice.The photocatalytic performance of in situ C-doped ZnO was 1.5 and 3.0 times higher than that of pure ZnO under visible light and UV irradiation,respectively.The hole and hydroxyl radicals were the main reactive groups of the in situ C-doped ZnO photocatalytic degrada-tion system,and thus the photocatalytic mechanism of C-doped ZnO was proposed.
Key words： nano-ZnO; C-doping; photocatalysis
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