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

• Published in: Environmental science & technology Vol. 52; no. 7; pp. 4099 - 4107
• Main Authors: Xu, Jinling, Koopal, Luuk K, Fang, Linchuan, Xiong, Juan, Tan, Wenfeng
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 03.04.2018
• Subjects: absorption; Adsorption; Binding; Calorimetry; Complexation; Copper; Enthalpy; Entropy; environmental science; Fine structure; Heat measurement; Heavy metals; Humic acids; Humic substances; Ions; Lignite; Mathematical models; Metal ions; Molecular chains; molecular weight; Organic acids; Parameters; Phenolic compounds; Phenols; Physical Chemistry and Soft Matter; soil; Soil investigations; Spectroscopy; Spectrum analysis; Studies; Titration; Titration calorimetry; Ultrastructure; X-radiation

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 tha...