Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 119, Issue -, Pages 52-59Publisher
ELSEVIER
DOI: 10.1016/j.jtice.2021.02.009
Keywords
Catecholamine polymer; Hexavalent chromium; Tannin; Polyethyleneimine; Adsorption
Categories
Funding
- National Natural Science Foundation of China [51503108, 51972180, 51572134]
- Key Technology Research and Development Program of Shandong [2019GGX102070, 2019GGX102027]
- Program for Scientific Research Innovation Team in Colleges and Universities of Jinan [2018GXRC006]
- Opening program of State Key Laboratory of Solid Lubrication [LSL-1904]
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The novel tannin-polyethyleneimine (TA-PEI) adsorbent fabricated via mussel-inspired polymerization exhibits highly efficient hexavalent chromium (Cr(VI)) adsorption capacity, with ultra-high Cr(VI) removal capacity and rapid adsorption rate. The adsorbent also shows excellent chemical reduction ability when treating Cr(VI) solutions.
A new catecholamine polymer, tannin-polyethyleneimine (TA-PEI) was fabricated via mussel-inspired polymerization for highly efficient hexavalent chromium (Cr(VI)) adsorption. The TA-PEI adsorbent was prepared with a mass ratio of TA to PEI of 3:1. This adsorbent had an ultra-high Cr(VI) removal capacity because of its amines and phenolic hydroxyl groups, with values reaching 707.96 mg/g under 308 K, which is higher than that of most PEI-based and TA-bearing adsorbents. The developed adsorbent also achieved rapid Cr(VI) adsorption, with adsorption capacity values reaching 554.94 mg/g in 15 min. Further, it displayed excellent chemical reduction ability when converting Cr(VI) to low toxicity Cr(III), as well as its good adsorption selectivity of Cr(VI) in a solution bearing coexisting ions. In a continuous adsorption experiment, the adsorbent exhibited a Cr(VI) solution treatment capacity of up to 30 L/g with a Cr(VI) concentration of 10 ppm. With its high adsorption capacity and rapid adsorption rate, this low cost and easily prepared adsorbent may have widespread potential for Cr(VI) removal and enrichment. (c) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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