Preparation of Attapulgite/CoFe 2 O 4 Magnetic Composites for Efficient Adsorption of Tannic Acid from Aqueous Solution

Yue Teng, Zhiying Liu, Ke Yao, Wenbin Song, Yongjun Sun, Hailing Wang and Yanhua Xu
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Yue Teng: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Zhiying Liu: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Ke Yao: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Wenbin Song: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Yongjun Sun: College of Urban Construction, Nanjing Tech University, Nanjing 211800, China
Hailing Wang: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Yanhua Xu: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China

IJERPH, 2019, vol. 16, issue 12, 1-17

Abstract: The use of attapulgite (ATP)-based materials for adsorption of pollutants from water and wastewater has received growing attention. However, recovering ATP-based adsorbents remains a challenge. In this study, a magnetic adsorbent ATP/CoFe 2 O 4 with high tannic acid (TA) adsorptive capacity was fabricated via a facile co-precipitation approach and was well characterized. The loaded CoFe 2 O 4 particles were embedded into the adsorbent surfaces to allow magnetic separability. For this material, its TA adsorption kinetics, isotherm behavior, and magnetic separation efficiency are reported. The developed magnetic composites had rapid sorption kinetics of 3 h, high sorption capacity of 109.36 mg/g, and good magnetic separation efficiency of 80%. The used ATP/CoFe 2 O 4 was successfully regenerated by NaOH and reused five times without a substantial reduction in TA removal and magnetic performance. Intermolecular hydrogen bonding formation and surface complexation were identified as the sorption mechanisms of TA by ATP/CoFe 2 O 4 .

Keywords: attapulgite; adsorption; CoFe 2 O 4 magnetic nanoparticle; tannic acid (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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