Leonardite-derived humic substances are great adsorbents for cadmium
Meng, Fande1,2; Yuan, Guodong3; Wei, Jing1; Bi, Dongxue1,2; Wang, Hailong4; Yuan, Guodong(Zhaoqing Univ, Zhaoqing 526061, Guangdong, Peoples R China)
2017-10-01
发表期刊ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN0944-1344
卷号24期号:29页码:23006-23014
产权排序第1完成单位
摘要Adsorption is an important mechanism to immobilize cadmium (Cd) in soil, for which humic substances have a potential. However, commercial humic substances are either very acidic (pH = 2) or alkaline/Na+-enriched, making them less suitable for use in acid and saline soils. Here, we used leonardite to produce humic adsorbents HA (pH = 4.02), Ca-HA (pH = 10.9), and Ca-CPAM-HA (pH = 9.62) by using HCl, CaCl2, or CaCl2-polyacrylamide as a flocculant. Their elemental compositions, acidity, and spectroscopic properties were determined, and their Cd adsorption characteristics were assessed by batch kinetic and thermodynamic experiments at environmentally relevant concentrations. Further, HA was mixed with Cd-contaminated soils and incubated for a month to assess its effect on Cd immobilization. Good fitting of kinetic adsorption data into pseudo-second-order model, together with FTIR spectroscopic data, suggested the chemisorption mechanism by forming Cd(II)-carboxyl complexes. The maximum adsorption capacity derived from the Langmuir equation was 129, 114, and 110 mg Cd(II)/g for HA, Ca-HA, and Ca-CPAM-HA, respectively. These values are almost the same on carbon-normalized basis. HA reduced acetic acid extractable Cd by 31% or more. Besides their high propensity for Cd adsorption, humic adsorbents are inexpensive, safe, and beneficial to soil quality.
关键词Humic Substances Cd Adsorption Soil Remediation Leonardite Ftir Immobilization
DOI10.1007/s11356-017-9947-8
项目资助者Chinese National Key Research and Development Program(2016YFD0200303) ; Dongguan Municipal Government(2014607101003) ; Key Research and Development Program of Shandong Province(2016CYJS05A01-1)
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收录类别SCI
关键词[WOS]AQUEOUS-SOLUTIONS ; HEAVY-METALS ; CONTAMINATED SOILS ; SEQUENTIAL EXTRACTION ; ADSORPTION ; CD(II) ; SORPTION ; REMOVAL ; BIOCHAR ; PB(II)
文章类型Article
语种英语
WOS研究方向Environmental Sciences & Ecology
WOS记录号WOS:000412453500022
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文献类型期刊论文
条目标识符http://ir.yic.ac.cn/handle/133337/23447
专题中科院海岸带环境过程与生态修复重点实验室
通讯作者Yuan, Guodong; Yuan, Guodong(Zhaoqing Univ, Zhaoqing 526061, Guangdong, Peoples R China)
作者单位1.Chinese Acad Sci, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai Inst Coastal Zone Res YIC, Shandong Prov Key Lab Coastal Environm Proc,YIC, Yantai 264003, Shandong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Zhaoqing Univ, Zhaoqing 526061, Guangdong, Peoples R China
4.Guangdong Dazhong Agr Sci Co Ltd, Hongmei Town 523169, Guangdong, Peoples R China
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Meng, Fande,Yuan, Guodong,Wei, Jing,et al. Leonardite-derived humic substances are great adsorbents for cadmium[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2017,24(29):23006-23014.
APA Meng, Fande,Yuan, Guodong,Wei, Jing,Bi, Dongxue,Wang, Hailong,&Yuan, Guodong.(2017).Leonardite-derived humic substances are great adsorbents for cadmium.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,24(29),23006-23014.
MLA Meng, Fande,et al."Leonardite-derived humic substances are great adsorbents for cadmium".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 24.29(2017):23006-23014.
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