Effect of the coexistence of SO32− and PO43− on the adsorption performance of zeolite-loaded FeOOH@ZnO for S2−

Autor: Fen Li, Youjing Li, Baocai Ge, Jinguang Hu, Cailian Yu, Fanzhu Meng
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Water Science and Technology, Vol 84, Iss 12, Pp 3641-3652 (2021)
Druh dokumentu: article
ISSN: 0273-1223
1996-9732
DOI: 10.2166/wst.2021.480
Popis: The present study deals with the synthesis of zeolite-loaded FeOOH@ZnO by hydrothermal method and investigates the effects of coexisting SO32− and PO43− ions in the aqueous solution on the adsorption performance for S2−. The results showed that the HNO3-modified zeolite loaded with FeOOH@ZnO (FeOOH@ZnO/HZ) resulted in a maximum S2− removal rate of ≈98%. The adsorbent's performance on removing S2− was significantly enhanced, compared with NaOH and ZnCl2-modified zeolites loaded with FeOOH@ZnO, and the adsorption was proved to be a heat-absorbing process. When SO32− and PO43− coexisted with S2−, SO32− and PO43− had a significant influence on the adsorption properties of FeOOH@ZnO/HZ. When three ions of S2−, SO32− and PO43− were present simultaneously, the adsorption performance of FeOOH@ZnO/HZ on S2− was further, and the removal rate dropped to about 80%. Moreover, FeOOH@ZnO/HZ also adsorbed PO43− and SO32− in the system containing multiple ions, but the adsorption rates of PO43− and SO32− were much lower than S2−. This indicated that the adsorption of S2− in the presence of FeOOH@ZnO/HZ dominates under competitive conditions. HIGHLIGHTS Modified zeolite-loaded FeOOH@ZnO is prepared.; The effect of PO43− and SO32− in water on the performance of FeOOH@ZnO/HZ in the adsorption of S2− is studied.; FeOOH@ZnO/HZ has a good adsorption effect on S2− and the adsorption process is a heat-absorbing process.; PO43− and SO32− affect the adsorption of S2− by FeOOH@ZnO/HZ, but S2− still dominates the adsorption competition.;
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