ISWC OpenIR  > 水保所2018--届毕业生论文
Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry
Xu, Jinling1,2
2018
Source PublicationEnvironmental Science & Technology
Volume52Issue:7Pages:4099-4107
Abstract

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.

MOST Discipline Catalogue农学 ; 农学::农业资源与环境
DOI10.1021/acs.est.7b06281
URL查看原文
Indexed BySCI
Language英语
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8831
Collection水保所2018--届毕业生论文
Affiliation1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and the Ministry of Water Resources, Yangling, Shaanxi Province 712100, P. R. China
2.University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
Recommended Citation
GB/T 7714
Xu, Jinling. 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 Xu, Jinling.(2018).Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry.Environmental Science & Technology,52(7),4099-4107.
MLA Xu, Jinling."Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry".Environmental Science & Technology 52.7(2018):4099-4107.
Files in This Item: Download All
File Name/Size DocType Version Access License
Proton and Copper Bi(1814KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Xu, Jinling]'s Articles
Baidu academic
Similar articles in Baidu academic
[Xu, Jinling]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Xu, Jinling]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Proton and Copper Binding to Humic Acids Analyzed by XAFS Spectroscopy and Isothermal Titration Calorimetry.pdf
Format: Adobe PDF
This file does not support browsing at this time
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.