Cyclic coupling of photocatalysis and adsorption for completely safe removal of N-nitrosamines in water

Autor:	Caini Liu, Lulu Kong, Huaiqi Shao, Huiyu Gao, Shougang Fan, Xiaoyan Guo, Man Zhang, Lan Wang, Mingce Long
Rok vydání:	2022
Předmět:	Environmental Engineering Ecological Modeling Inorganic chemistry chemistry.chemical_element Pollution Nitrogen Adsorption chemistry Photocatalysis N nitrosamines Coupling (piping) Zeolite Waste Management and Disposal Water Science and Technology Civil and Structural Engineering
Zdroj:	Water Research. 209:117904
ISSN:	0043-1354
DOI:	10.1016/j.watres.2021.117904
Popis:	The incomplete removal of N-nitrosamines in water through current degraded techniques and the carcinogenicity of N-nitrosamines call for alternative complete and safe removal approaches. Here, we describe a cyclic coupling process of photocatalysis and adsorption enabling N-nitrosamines in water thoroughly and safely removed. Among them, the immobilized TiO2/Ti photocatalyst degraded N-nitrosamines into primary and secondary amines up to 100% by attacking on nitrosyl nitrogen via •OH originated from its nanowire film morphology. Furthermore, the affinity of HY zeolite to primary and secondary amines led to efficient adsorption through corresponding to Lagergren adsorption rate equation of second order. And then the cyclic coupling process of photocatalysis and adsorption realized complete and safe removal of N-nitrosamines with various concentration ranging from 0.1 mM to 1 mM in water, significantly higher than the existing reports on the removal rate of N-nitrosamines and the formation potential of N-nitrosamines. This study will lead to new avenues for complete and safe eliminaton of hardly degradable hazardous substances in water.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::882ccf268527aa4de8a3d9276ccfc83d https://doi.org/10.1016/j.watres.2021.117904 Zobrazit plný text záznamu Full Text from ScienceDirect