| 李跃军,曹铁平,孙大伟.PANI诱导ZnO@ZnWO4构建双S型异质结用于光催化CO2还原[J].分子催化,2025,39(1):65-75 |
| PANI诱导ZnO@ZnWO4构建双S型异质结用于光催化CO2还原 |
| PANI Induced ZnO@ZnWO4 to Construct Double S-scheme Heterojunction for Photocatalytic CO2 Reduction |
| 投稿时间：2024-11-18 修订日期：2024-12-28 |
| DOI：10.16084/j.issn1001-3555.2025.01.007 |
| 中文关键词: 双S型异质结 聚苯胺 复合纤维 光催化CO2还原 |
| 英文关键词:double S-scheme heterojunction PANI composite fibers photocatalytic CO2 reduction |
| 基金项目:国家自然科学基金(No. 21573003)[ National Natural Science Foundation of China (No. 21573003)]. |
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| 中文摘要: |
| 以ZnO和ZnWO4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CO2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@ZnWO4/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@ZnWO4/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@ZnWO4的还原电位, 并具有光催化CO2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3.02 μmol·g-1·h-1. |
| 英文摘要: |
| Zn-based semiconductor materials, such as ZnO and ZnWO4, 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 CO2 reduction activity. In this paper, ZnO@ZnWO4/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@ZnWO4/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@ZnWO4, and has the capacity to photocatalytic CO2 reduction. Under simulated solar irradiation for 3 h, the formation rates of CH4 and CO reached to 11.88 and 3.02 μmol·g-1·h-1, respectively. |
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