Mercury (II) Adsorption on Three Contrasting Chinese Soils Treated with Two Sources of Dissolved Organic Matter: II. Spectroscopic Characterization

Abstract

2015): Mercury (II) adsorption on three contrasting Chinese soils treated with two sources of dissolved organic matter: II. AbstractTo reveal the influencing mechanism of dissolved organic matter (DOM) on mercury (Hg II) adsorption by black, red and fluvo-aquic soils in China, Fourier transform infrared (FTIR) spectroscopy, 13 C nuclear magnetic resonance (NMR) spectroscopy, and the 3-dimensional excitation emission matrix (3DEEM) fluorescence spectroscopy were employed to characterize the DOM samples and DOM-Hg complexes. The FTIR spectra showed that the complexation of Hg (II) mainly acted on the C=O, COO -, and O-H groups of DOM from swine manure (DOMs) and wheat straw (DOMw). The NMR spectra indicated that the complex reaction of Hg (II) and DOM corresponded with the change in carboxyl C. The NMR results also showed that the dominant C components in DOM were aromatic C, O-alkyl C and alkyl C and carboxyl C, and Downloaded by [New York University] at 18:49 30 July 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2that DOMw imposed more influence on Hg (II) adsorption than DOMs, which was consistent with that of FTIR spectroscopy. The 3DEEM showed that DOM contained both aromatic protein-like and fulvic-like substances, and that the protein-like properties of DOMs and UV fulvic-like fluorescence substances of DOMw can be better participated in the formation of Hg complexes. This result provides strong direct evidence to elucidate the DOM-Hg (II) binding mechanism, and further better interprets the effect mechanism of exogenous DOM on Hg adsorption by soil.

Effect of natural organic matter (NOM) on the removal efficiency of Hg(ii) by MoS2: dependence on the Hg/MoS2 ratio and NOM properties

“…4d), 44 implying the formation of the Hg-NOM complexes through the complexation between Hg and -COOH and/or -OH groups on the NOM molecules. [45][46][47] Additionally, the particle size and ζ potential of MoS 2 remained unaffected by the addition of NOM with concentration up to 100 mg L −1 (Fig. S14 †).…”

Multiple roles of dissolved organic matter on typical engineered nanomaterials: environmental behaviors, pollutants removal and potential risks

“…3 and Table S2. Generally, DOM exerted good adsorption properties on environmental pollutants, particularly heavy metals (Ma et al 2015;Valipour et al 2018). With unique functional groups (i.e., carboxyl group and hydroxy group), DOM could become stable coupling with heavy metals (Chien et al 2021;Zhao et al 2018).…”

Binding of Calcium and Magnesium Ions to Chromophoric Dissolved Organic Matter (CDOM): A Combination of Steady-State and Time-Resolved Fluoresce Study

“…Among various metal ions, copper ion (Cu 2+ ) [9][10][11] and mercury ion (Hg 2+ ) [12,13], were the most frequently investigated species. Previous studies demonstrated that binding constants between Cu 2+ , Hg 2+ , and NOM could be up to 10 6 L/mol [14,15], leading to a decreased fluorescence intensity of NOM.…”