PANI诱导ZnO@ZnWO_(4)构建双S型异质结用于光催化CO_(2)还原  

PANI Induced ZnO@ZnWO_(4)to Construct Double S-scheme Heterojunction for Photocatalytic CO_(2)Reduction

作　　者：李跃军 曹铁平 孙大伟 LI Yuejun;CAO Tieping;SUN Dawei(School of Medicine,Hainan Vocational University of Science and Technology,Haikou 570100,China;College of Chemistry,Baicheng Normal University,Baicheng 137000,China)

机构地区：[1]海南科技职业大学医药学院,海口570100 [2]白城师范学院化学学院,吉林白城137000

出　　处：《分子催化(中英文)》2025年第1期65-75,I0003,共12页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金(No.21573003)。

摘　　要：以ZnO和ZnWO_(4)为代表的Zn基半导体材料是目前广泛研究的光催化剂,然而其存在电子-空穴对易复合和导带电位偏高等结构问题,致使其不具备光催化CO_(2)还原活性.本文以静电纺丝技术制备的具有特定形态聚苯胺(PANI)纤维作为复合单元,硝酸锌为锌源,氢氧化钠和氨水为矿化剂,成功制备了ZnO@ZnWO_(4)/PANI复合纤维光催化材料.采用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外-可见漫反射光谱(UV-Vis DRS)和光致发光光谱(PL)等对复合纤维材料的物相组成、微观形貌和光电性能等进行表征.通过电子顺磁共振和光催化性能测试,确定ZnO@ZnWO_(4)/PANI形成的双S型异质结,不仅促进了光生电子-空穴对的有效分离,而且降低了ZnO@ZnWO_(4)的还原电位,并具有光催化CO_(2)还原活性.模拟太阳光照3 h,CH4和CO的生成速率分别达到11.88和3.02μmol∙g^(−1)∙h^(−1).Zn-based semiconductor materials,such as ZnO and ZnWO_(4),are widely studied in photocatalysis.However,due to the problems of electron-hole pair fast recombination and high conduction potential,they do not have photocatalytic CO_(2)reduction activity.In this paper,ZnO@ZnWO_(4)/PANI composite fiber photocatalytic material was successfully prepared by using polypheniline fiber with specific morphology(PANI)as composite unit,zinc nitrate as zinc source,sodium hydroxide and ammonia as mineralizer.XRD,SEM,TEM,UV-Vis DRS and photoluminescence spectroscopy were used to characterize the phase composition,microstructure and photoelectric properties of the composite fiber materials.The formation of double S-scheme heterojunction over ZnO@ZnWO_(4)/PANI determined by electron EPR and photocatalytic reaction process,which not only promotes the effective separation of photogenerated electron-hole pairs,but also reduces the reduction potential of ZnO@ZnWO_(4),and has the capacity to photocatalytic CO_(2)reduction.Under simulated solar irradiation for 3 h,the formation rates of CH4 and CO reached to 11.88 and 3.02μmol∙g^(−1)∙h^(−1),respectively.

关 键 词：双S型异质结 聚苯胺 复合纤维 光催化CO_(2)还原 

分 类 号：O643.36[理学—物理化学]