Characteristics and factors influencing Pb(II) desorption from a Chinese clay by citric acid

Characteristics and factors influencing Pb(II) desorption from a Chinese clay by citric acid
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柠檬酸解吸中国粘土中 Pb(II) 的特性及影响因素

DOI:
10.1080/01496395.2016.1216128
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发表时间:
2016-08
影响因子:
2.8
通讯作者:
Liu, Yang
Liu, Yang
中科院分区:
工程技术4区
文献类型:
--
作者:
Chu, Jiaming;Wang, Yan;Zhou, Ting;Liu, Yang

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土壤重金属污染因其毒性大、对人体健康具有潜在的威胁而受到世界各国的广泛关注。因此,在这项研究中,铅(II)的柠檬酸从中国粘土的解吸行为进行了评估。结果表明,在2 h内,Pb(II)的去除率可达60%左右。酸性条件下,相对较高的柠檬酸浓度和污染水平被认为是有益的铅(II)的解吸。在解吸过程中,最初固定的Pb(II)首先被H+取代,特别是在低选择性吸附位点。释放的Pb(II)然后被来自柠檬酸的有机配体螯合。
ABSTRACT Soil contamination by heavy metals has attracted worldwide attention, since its highly toxicity and potential threaten to the human health. Thus, in this study, the desorption behaviors of Pb(II) by citric acid from a Chinese clay were evaluated. According to the results, Pb(II) removal percentage reached around 60% within 2 h. The acidic condition, relative high concentration of citric acid and contamination levels were found to be beneficial for Pb(II) desorption. During the desorption process, the originally fixed Pb(II) was first replaced by H+, especially at low selectivity sorption sites. The released Pb(II) was then chelated by organic ligands from citric acid.
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