Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry

doi:10.1021/acs.est.7b06281

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	Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry
	Tan, WF (reprint author), Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China.; Jinling Xu 1,3; Luuk K. Koopal 2,4; Linchuan Fang 3; Juan Xiong 2; Wenfeng Tan 2,3; Fang, LC ; Tan, WF (reprint author), Chinese Acad Sci, Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2018
卷号	52 期号:7 页码:4099-4107
ISSN号	0013-936X
DOI	10.1021/acs.est.7b06281
文献子类	Article
英文摘要	Proton and copper (Cu) binding to soil and lignite-based humic acid (HA) was investigated by combining X-ray absorption fine structure (XAFS) spectroscopy, isothermal titration calorimetry (ITC), and nonideal-competitive-adsorption (NICA) modeling. NICA model calculations and XAFS results showed that bidentate and monodentate complexation occurred for Cu binding to HA. The site-type-specific thermodynamic parameters obtained by combining ITC measurements and NICA calculations revealed that copper binding to deprotonated carboxylic-type sites was entropically driven and that to deprotonated phenolic-type sites was driven by entropy and enthalpy. Copper binding to HA largely depended on the site-type and coordination environment, but the thermodynamic binding mechanisms for Cu binding to the specific site-types were similar for the different HAs studied. By comparing the site-type-specific thermodynamic parameters of HA-Cu complexation with those of low molar mass organic acids, the Cu coordination could be further specified. Bidentate carboxylic Cu complexes made the dominating contributions to Cu binding to HA. The present study not only yields molecular-scale mechanisms of ion binding to carboxylic- and phenolic-type sites of HA but also provides the new insight that the universal nature of site-type-specific thermodynamic data enables quantitative estimation of the binding structures of heavy metal ions to humic substances.
学科主题	Engineering ; Environmental Sciences & Ecology
出版地	1155 16TH ST, NW, WASHINGTON, DC 20036 USA
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000429385700030
资助机构	National Natural Science Foundation of China [41425006, 41330852, 41571314, 41101218] ; National Natural Science Foundation of China [41425006, 41330852, 41571314, 41101218] ; National Key Basic Research Program of China [2015CB150504] ; National Key Basic Research Program of China [2015CB150504] ; CAS "Light of West China" Program [XAB2016A03] ; CAS "Light of West China" Program [XAB2016A03] ; National Natural Science Foundation of China [41425006, 41330852, 41571314, 41101218] ; National Natural Science Foundation of China [41425006, 41330852, 41571314, 41101218] ; National Key Basic Research Program of China [2015CB150504] ; National Key Basic Research Program of China [2015CB150504] ; CAS "Light of West China" Program [XAB2016A03] ; CAS "Light of West China" Program [XAB2016A03]
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/8266]
专题	水保所科研产出--SCI_2018--SCI
通讯作者	Tan, WF (reprint author), Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China.; Fang, LC; Tan, WF (reprint author), Chinese Acad Sci, Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China 3.Chinese Acad Sci, Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 4.Wageningen Univ & Res, Phys Chem & Soft Matter, Stippeneng 4, NL-6708 WE Wageningen, Netherlands
推荐引用方式 GB/T 7714	Tan, WF ,Jinling Xu,Luuk K. Koopal,et al. Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(7):4099-4107.
APA	Tan, WF .,Jinling Xu.,Luuk K. Koopal.,Linchuan Fang.,Juan Xiong.,...&Tan, WF .(2018).Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry.ENVIRONMENTAL SCIENCE & TECHNOLOGY,52(7),4099-4107.
MLA	Tan, WF ,et al."Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry".ENVIRONMENTAL SCIENCE & TECHNOLOGY 52.7(2018):4099-4107.