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Separation Science and Technology Volume 56, 2021 - Issue 13
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Adsorption

High-efficiency removal of low-concentration Hg(II) from aqueous solution by bentonite nanocomposite: Batch and fixed-bed column adsorption study

Xiaohuan Wanga Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Henan Provincal Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project, College of Chemistry and Pharmaceutical Engineering, College of Agricultural Engineering, Nanyang Normal University, Nanyang, P.R. China;b Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi, P.R. ChinaCorrespondence[email protected]
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Zhifeng Zhanga Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Henan Provincal Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project, College of Chemistry and Pharmaceutical Engineering, College of Agricultural Engineering, Nanyang Normal University, Nanyang, P.R. ChinaView further author information
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Ruzhong Suna Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Henan Provincal Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project, College of Chemistry and Pharmaceutical Engineering, College of Agricultural Engineering, Nanyang Normal University, Nanyang, P.R. ChinaView further author information
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Haiquan Xiea Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Henan Provincal Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project, College of Chemistry and Pharmaceutical Engineering, College of Agricultural Engineering, Nanyang Normal University, Nanyang, P.R. ChinaView further author information
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Lunguang Yaoa Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Henan Provincal Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project, College of Chemistry and Pharmaceutical Engineering, College of Agricultural Engineering, Nanyang Normal University, Nanyang, P.R. ChinaView further author information
Pages 2204-2216 | Received 19 May 2020, Accepted 29 Aug 2020, Published online: 14 Sep 2020
 
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ABSTRACT

A nanocomposite based on bentonite was synthesized. Its adsorption properties for Hg(II) were evaluated by batch and fixed-bed column adsorption experiments. The results showed that the nanocomposite was an efficient adsorbent for the treatment of wastewater containing low-concentration Hg(II). It removed more than 92% of Hg(II) from aqueous solution with a pH ranged from 4.00 to 12.00. Its adsorption capacity for Hg(II) increased linearly with the increase of mercury concentration. The nanocomposite had excellent reusability. HCl solution can be used to elute Hg(II) ions loaded. The developed Bohart–Adams model can be used for the design of adsorption column.

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Funding

This work was supported by the Key Scientific Research Projects of Higher Education Institutions in Henan Province (Grant No. 20B150017); Key R&D and promotion project plan of Henan Province (Grant No. 202102310594), “Wolong Scholars” Award Plan of Nanyang Normal University; Science and Technology Program of Nanyang (Grant No. JCQY001); and Doctoral Program of Nanyang Normal University (Grant No. 2019ZX010).

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