Effective removal of fluoride from wastewater by magnesium oxide-loaded aeolian sand with high loading ratio

doi:10.1016/j.cjche.2025.05.030

中国化学工程学报 ›› 2025, Vol. 87 ›› Issue (11): 369-380.DOI: 10.1016/j.cjche.2025.05.030

Effective removal of fluoride from wastewater by magnesium oxide-loaded aeolian sand with high loading ratio

Chenxin Ding^1,2, Zhen Jin^1,2, Qianxi Li^1,2, Shuhao Zhou^1,2, Yuru Sun^1,2

1. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China;
2. Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, China

收稿日期:2024-12-27 修回日期:2025-04-30 接受日期:2025-05-07 出版日期:2025-11-28 发布日期:2025-07-22
通讯作者: Zhen Jin,E-mail:ftbjin@hotmail.com
基金资助:
This work was 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).

Effective removal of fluoride from wastewater by magnesium oxide-loaded aeolian sand with high loading ratio

Chenxin Ding^1,2, Zhen Jin^1,2, Qianxi Li^1,2, Shuhao Zhou^1,2, Yuru Sun^1,2

1. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China;
2. Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, China

Received:2024-12-27 Revised:2025-04-30 Accepted:2025-05-07 Online:2025-11-28 Published:2025-07-22
Contact: Zhen Jin,E-mail:ftbjin@hotmail.com
Supported by:
This work was 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).

摘要/Abstract

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 pH 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.

关键词: Fluoride removal, Magnesium oxide, Aeolian sand, Adsorption

Abstract: 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 pH 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.

Key words: Fluoride removal, Magnesium oxide, Aeolian sand, Adsorption

Chenxin Ding, Zhen Jin, Qianxi Li, Shuhao Zhou, Yuru Sun. Effective removal of fluoride from wastewater by magnesium oxide-loaded aeolian sand with high loading ratio[J]. 中国化学工程学报, 2025, 87(11): 369-380.

Chenxin Ding, Zhen Jin, Qianxi Li, Shuhao Zhou, Yuru Sun. Effective removal of fluoride from wastewater by magnesium oxide-loaded aeolian sand with high loading ratio[J]. Chinese Journal of Chemical Engineering, 2025, 87(11): 369-380.

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Effective removal of fluoride from wastewater by magnesium oxide-loaded aeolian sand with high loading ratio

Effective removal of fluoride from wastewater by magnesium oxide-loaded aeolian sand with high loading ratio

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