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Zhou Qingwei,Wu Weihong 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.6
Constructed wetlands (CWs) have been successfully employed to treat domestic sewage, while it is reported that inconsistent and low nutrient removal efficiency has been achieved. Due to the good performance in other treatment systems, magnetic Fe₃O₄ nanoparticles (Fe₃O₄ NPs) can provide a new pathway for the nutrient removal in CWs. In this study, the influences of Fe₃O₄ NPs on the nutrient removal and variation of microbial community were investigated. The CWs with Fe₃O₄ had better NH₄<SUP>+</SUP>-N (ammonia nitrogen, 95.9%), NO₃<SUP>-</SUP>-N (nitrate nitrogen, 83.8%), and TP (total phosphorus, 90.4%) removal percentages than that without Fe₃O₄. High-throughput sequencing analysis indicated that the microbial community structure could be changed by Fe₃O₄ NPs. For example, at class level, the major bacteria such as Betaproteobacteria, Gammaproteobacteria and Deltaproteobacteria were promoted by Fe₃O₄ NPs. On the other hand, at genus level, some abundant genera disappeared, while other abundant genera became dominant in CWs with Fe₃O₄ NPs, including Desulfuromonas (3.0%), Azospirillum (1.9%), Chryseolinea (1.5%), and Desulfomicrobium (1.8%). The latter genera essentially improved the microbial community involved in the nitrogen removal. Therefore, the CWs with Fe₃O₄ NPs showed higher NH₄<SUP>+</SUP>-N and NO₃<SUP>-</SUP>-N removal percentages than that without Fe₃O₄ NPs.
Xingwang Zhou,Jun Yao,Ming Yang,Jiangquan Ma,Qingwei Zhou,Ershen Ou,Zhen Zhang,Xueni Sun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.4
In this research, a series of novel MoSe2/SrTiO3 heterostructures were successfully prepared by a two-step hydrothermal method. The samples were characterized by XRD, UV-Vis, SEM, TEM, EDS and XPS. Results showed that the degradation of MO under UV is better than that under the visible light. And, MoSe2 loaded on SrTiO3 under UV irradiation demonstrated a higher catalytic activity. The degradation rate of methyl orange was 99.46% for MoSe2/SrTiO3 under the optimum loading weight (0.1 wt.%). This is mainly because the combination of MoSe2 and SrTiO3 prevents electrons and holes recombination in SrTiO3 and · O2 - appears in the system. In general, MoSe2/SrTiO3 heterostructures have good environmental friendliness for photocatalytic degradation.