Abstract
A novel amorphous silicate material(AS) was successfully synthesized from dolomite in a simple way. The characteristics of AS were confirmed by XRD, SEM-EDS, TEM, and FT-IR. Spectroscopy studies showed the material could be classified to a highly aggregated amorphous material which possessed abundant pore channels. Thermodynamic and kinetic studies were also carried out in this paper. The result showed adsorption process is spontaneous and endothermic. The paper revealed the adsorption mechanism belonged to cation exchange and the exchange capacity order for Cu2+ followed Ca2+>Mg2+. Better yet, Ca2+ and Mg2+ exchanged into waste water will not cause secondary pollution. Compared with 60mg/g for dolomite powder, it was found that as-synthesized material had a greater affinity to copper ions(Ⅱ) and the adsorption capacity could reach up to 360 mg/g. Given a relative compact crystal structure in dolomite, it was generally believed that Ca2+ and Mg2+ in a disordered porous structure could be in favor of adsorption performance.
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