摘要
In this study,a facile and effective hydrothermal approach was developed to synthesize magnesium oxide loaded aeolian sand(MOAS) with a high loading ratio as an environmentally friendly adsorbent for effective removal of fluoride from wastewater.The analysis of material morphology and structure revealed that the MOAS has a stacked structure and the magnesium oxide is successfully loaded on the surface of aeolian sand with high loading ratio(230%).The adsorption kinetics demonstrated that the adsorption of fluoride by MOAS followed the pseudo-second-order model.The adsorption isotherm conformed to the Redlich-Peterson model with a saturated adsorption capacity of 153.11 mg·g^(-1).MOAS exhibited excellent defluorination performance over a wide p H range and in the presence of competitive anion,respectively.The density functional theory(DFT) theoretical calculations verify that the MOAS has strong affinity for fluoride.The adsorption mechanism was investigated through FTIR and XPS,revealing that hydroxyl exchange and coordination on the surface were responsible for the defluorination of MOAS.Finally,desorption,regeneration,adsorption column experiments and actual wastewater experiment further confirmed the practical potential of MOAS for defluorination applications.
基金
supported in part by Natural Science Foundation of Anhui Province (2008085MB44)
Natural Science Research Project of Anhui Educational Committee (2022AH040046,2024AH050247)
Excellent Scientific Research and Innovation Team in Colleges and Universities of Anhui Province (2022AH010017)
Open Project of State Key Laboratory (SKLECRA20230FP01)。
