Highly effective removal of Hg(ii) solution using corn bract@MoS2 as a new biomass adsorbent

Abstract

As known, mercury contamination is one of the current environmental issues due to the high toxicity of mercury. Corn bract (CB) is an agricultural by-product, and its final treatment is generally incineration that causes air pollution. In this study, a new type of high-efficiency biomass adsorbent (CB@MoS₂) for adsorption of Hg(II) was obtained, and its morphology and structure were characterized with FT-IR, XRD, SEM and TEM. The results showed that when the pH value, Hg(II) ion concentration and adsorption time were 4, 100 mg L⁻¹ and 120 min, the adsorption capacity and removal rate could reach 332.50 mg g⁻¹ and 99.75%. In addition, CB@MoS₂ had a good selectivity for Hg(II) ions. The adsorption behavior followed pseudo-second-order kinetics, indicating that the adsorption of Hg(II) ions by CB@MoS₂ was a chemical adsorption. After five adsorption–desorption experiments, it still possessed good adsorption performance and effective regeneration. In short, CB@MoS₂ has high efficiency and good reusability, and will become a candidate material for the treatment of mercury-containing industrial wastewater.