Efficient removals of Hg and Cd in aqueous solution through NaOH-modified activated carbon fiber

Title
Efficient removals of Hg and Cd in aqueous solution through NaOH-modified activated carbon fiber
Authors
양철민김두원위재형Kap Seung Yang
Keywords
Heavy metal removal in water; Activated carbon fiber; NaOH modification; Adsorption mechanism
Issue Date
2020-07
Publisher
Chemical engineering journal
Citation
VOL 392, 123768
Abstract
This manuscript describes an efficient and cost-effective method to remove heavy metals of Hg and Cd in aqueous solutions via adsorption on activated carbon fibers after modification with NaOH solution (NaACF). The Hg and Cd metals in the aqueous solution exist as Hg(OH)2 and Cd2+ in the experimental condition of pH 6– 8. Surface characterization of the NaACF reveals uniform and narrower micropores with an increase in oxygen functional groups of phenol and lactone compared with the original ACF (pACF). The NaACF demonstrates a superior adsorption rate to both aqueous samples of heavy metal compounds. The granular activated carbon (GAC) with diverse pore structures consisting of micropores, mesopores, and macropores adsorbed the heavy metals at a relatively slow rate. The adsorption mechanisms of the heavy metals into NaACF pores are proposed as pore-filling with non-ionic Hg(OH)2 and electron sharing of oxygens in phenolic, lactone, and carboxylic acid groups with ionic Cd2+. The results from continuous feeding are also reported for the sample blend of 10 wt% NaACF and 90 wt% GAC in increasing the cost performance ratio.
URI
http://pubs.kist.re.kr/handle/201004/71258
ISSN
1385-8947
Appears in Collections:
KIST Publication > Article
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