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作者

Qin, Kun Hung, Ci-Jing Liao, Yasi Kuan, Chia-Ching Wang, TsingHai Guan, Chung-Yu Chen, Ching-Lung

作者单位

³Department of Environmental Engineering, National I-Lan University, Yilan 243, Taiwan 260, Taiwan ²Department of Chemical Engineering and Materials Science, Yuan Ze University, Chongli, 320, Taiwan ⁴Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City 271016, China ¹College of Chemistry and Pharmaceutical Engineering, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, Shandong

刊名

SSRN

年份

2023

ISSN

1556-5068

摘要

Resource reclamation with low carbon emissions is highly desirable from the perspective of the circular economy. We propose a green solution in this study, which involves mining calcium and magnesium from seawater as an effective reagent for the recovery of valuable fluoride. This was achieved by esterifying the cellulose filter papers with citric acid to associate carboxyl groups onto their surfaces. Consequently, the high affinity between the carboxyl group and alkaline earth elements enabled ...更多

Resource reclamation with low carbon emissions is highly desirable from the perspective of the circular economy. We propose a green solution in this study, which involves mining calcium and magnesium from seawater as an effective reagent for the recovery of valuable fluoride. This was achieved by esterifying the cellulose filter papers with citric acid to associate carboxyl groups onto their surfaces. Consequently, the high affinity between the carboxyl group and alkaline earth elements enabled efficient and selective loading of [[EQUATION]] and [[EQUATION]] onto the filter papers, reaching up to 96% and 60% of the available active sites, respectively. When applied in natural seawater, the esterified filter papers successfully captured both [[EQUATION]] and [[EQUATION]] simultaneously. The presence of IR singlet symmetric stretching vibrations indicated that both [[EQUATION]] and [[EQUATION]] ions were complexed with carboxyl groups in a bridging unidentate mode. The adsorption capacity of [[EQUATION]] and [[EQUATION]] was likely influenced by the varying thickness of their hydration shells within the highly overlapped electric double layers presented in the micropores of the esterified filter papers. The papers loaded with [[EQUATION]] and [[EQUATION]] were subsequently utilized for fluoride recovery in simulated HF wastewater. The formation of [[EQUATION]] colloids effectively recovered the stoichiometric amount of fluoride , which were retained on the surface of the filter papers. Additional flocculation for colloid separation is thus avoided, resulting in a significant increase in the content of reclaimed fluoride. Increasing the density of associated carboxyl groups is crucial for effectively complexing a greater amount of seawater [[EQUATION]]/[[EQUATION]] and, consequently, enhancing the capacity of fluoride reclamation by esterified filter papers.收起

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