Title

土壤中典型矿物对锑的吸附-沉积行为研究.

Authors

郭贵宾; 袁晓雅; 黄理金; 帅琴; 胡圣虹; 欧阳磊

Abstract

Human activities such as mineral mining and coal combustion cause a large amount of antimony to enter into environmental soil. Exploring the adsorption deposition behavior of antimony on typical soil minerals is important for predicting the environmental fate of antimony and preventing its pollution. Thus, six kinds of commonly found metal hydroxides and clay minerals in soil (namely hematite, goethite, ferrihydrite, aluminum oxide, ramsdellite, and kaolinite) were selected to investigate the adsorption thermodynamic and kinetic behavior of Sb(III) and Sb(V) on their surfaces, and speculate the adsorption mechanism. The order of adsorption capacities (mg/g) of six soil minerals for Sb(III)/Sb(V) were as follows: ferrihydrite (101.4, 55.9)>ramsdellite (16.52, 7.58)>goethite (13.30, 5.67)>hematite (5.13, 3.70)>aluminum oxide (1.66, 1.69)>kaolinite (0.27, 0.51). Affected by the speciation of antimony and the surface potential of minerals, acidic conditions were favorable for the adsorption of Sb(V), while the adsorption of Sb(III) was less affected by pH. The Sb2O3 formed after deposition was characterized in situ by Raman spectroscopy. Sb(V) adsorbed on the mineral by adsorption at different concentrations, while Sb(III) deposits on the mineral surface at higher concentrations.

Subjects

HYDROXIDE minerals; SOIL mineralogy; ALUMINUM oxide; COAL combustion; CLAY minerals; ANTIMONY; GOETHITE; KAOLINITE

Publication

Rock & Mineral Analysis, 2025, Vol 44, Issue 1, p127

ISSN

0254-5357

Publication type

Academic Journal

DOI

10.15898/j.ykcs.202404210093