Enesca Alexandru, Isac Luminita
Product Design, Mechatronics and Environmental Department, Transilvania University of Brasov, Eroilor 29 Street, 35000 Brasov, Romania.
Renewable Energy Systems and Recycling Research Center, Product Design, Mechatronics and Environmental Department, Transilvania University of Brasov, Eroilor 29 Street, 35000 Brasov, Romania.
Materials (Basel). 2021 Jun 30;14(13):3656. doi: 10.3390/ma14133656.
Volatile organic compounds (VOCs) are commonly found in indoor spaces (e.g., homes or offices) and are often related to various illnesses, some of them with carcinogenic potential. The origins of VOC release in the indoor environment are in office products, building materials, electronics, cleaning products, furniture, and maintenance products. VOC removal can be done based on two types of technologies: adsorption in specific materials and decomposition via oxidative processes. The present article reports the development and photocatalytic activity of two heterostructures (CuS/WO and CuS/SnO) used for indoor air decontamination. The acetaldehyde removal rate is discussed in correlation with the S-scheme mechanisms established between the heterostructure components but also comparatively with the bare catalysts' activity. Acetaldehyde was considered as a VOC reference because it was found by the International Agency for Research on Cancer to be one of the most frequent air toxins with potential carcinogenic effects. The samples contained monoclinic WO, tetragonal SnO, and orthorhombic CuS crystalline structures. The CuS crystallite size in the heterostructure varied from 75.9 to 82.4 Å, depending on the metal oxide substrate. The highest photocatalytic efficiency (75.7%) corresponded to CuS/SnO, with a constant rate of 0.106 s (which was three times faster than WO or SnO and seven and a half times faster than CuS).
挥发性有机化合物（VOCs）常见于室内空间（如家庭或办公室），且往往与各种疾病有关，其中一些具有致癌潜力。室内环境中VOC释放的源头在于办公产品、建筑材料、电子产品、清洁产品、家具和维护产品。VOC去除可基于两种技术：在特定材料中吸附以及通过氧化过程进行分解。本文报道了用于室内空气净化的两种异质结构（CuS/WO和CuS/SnO）的开发及其光催化活性。结合异质结构组件之间建立的S型机制讨论了乙醛去除率，同时也与裸催化剂的活性进行了比较。乙醛被视为VOC参考物，因为国际癌症研究机构发现它是最常见的具有潜在致癌作用的空气毒素之一。样品包含单斜晶系的WO、四方晶系的SnO和正交晶系的CuS晶体结构。异质结构中CuS微晶尺寸根据金属氧化物基底的不同在75.9至82.4 Å之间变化。最高光催化效率（75.7%）对应于CuS/SnO，其恒定速率为0.106 s⁻¹（比WO或SnO快三倍，比CuS快七点五倍）。
