Sobczuk Konrad Sebastian, Pełech Iwona, Sibera Daniel, Staciwa Piotr, Wanag Agnieszka, Ekiert Ewa, Kapica-Kozar Joanna, Ćmielewska Katarzyna, Kusiak-Nejman Ewelina, Morawski Antoni Waldemar, Narkiewicz Urszula
Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland.
Department of Construction and Road Engineering, Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, Piastów 50a, 70-311 Szczecin, Poland.
Materials (Basel). 2024 Dec 15;17(24):6139. doi: 10.3390/ma17246139.
The photocatalytic reduction of CO to useful products is an area of active research because it shows a potential to be an efficient tool for mitigating climate change. This work investigated the modification of titania with copper(II) nitrate and its impact on improving the CO reduction efficiency in a gas-phase batch photoreactor under UV-Vis irradiation. The investigated photocatalysts were prepared by treating P25-copper(II) nitrate suspensions (with various Cu concentrations), alkalized with ammonia water, in a microwave-assisted solvothermal reactor. The titania-based photocatalysts were characterized by SEM, EDS, ICP-OES, XRD and UV-Vis/DR methods. Textural properties were measured by the low-temperature nitrogen adsorption/desorption studies at 77 K. P25 photocatalysts modified with copper(II) nitrate used in the process of carbon dioxide reduction allowed for a higher efficiency both for the photocatalytic reduction of CO to CH and for the photocatalytic water decomposition to hydrogen as compared to a reference. Similarly, modified samples showed significantly higher selectivity towards methane in the CO conversion process than the unmodified sample (a change from 30% for a reference sample to 82% for the P25-R-Cu-0.1 sample after the 6 h process). It was found that smaller loadings of Cu are more beneficial for increasing the photocatalytic activity of a sample.
将一氧化碳光催化还原为有用产物是一个活跃的研究领域，因为它显示出成为缓解气候变化的有效工具的潜力。这项工作研究了用硝酸铜（II）对二氧化钛进行改性及其在紫外-可见光照射下对提高气相间歇式光反应器中一氧化碳还原效率的影响。所研究的光催化剂是通过在微波辅助溶剂热反应器中处理用氨水碱化的P25-硝酸铜（II）悬浮液（具有不同的铜浓度）制备的。基于二氧化钛的光催化剂通过扫描电子显微镜（SEM）、能谱仪（EDS）、电感耦合等离子体发射光谱仪（ICP-OES）、X射线衍射仪（XRD）和紫外-可见/漫反射（UV-Vis/DR）方法进行表征。通过在77 K下的低温氮吸附/脱附研究测量织构性质。与参比样品相比，在二氧化碳还原过程中使用硝酸铜（II）改性的P25光催化剂对于将一氧化碳光催化还原为甲烷以及光催化水分解制氢都具有更高的效率。同样，改性样品在一氧化碳转化过程中对甲烷的选择性明显高于未改性样品（在6小时的过程后，参比样品的选择性从30%变为P25-R-Cu-0.1样品的82%）。研究发现，较小的铜负载量更有利于提高样品的光催化活性。
