Adsorption Mechanism of Copper(Ⅱ) ions on Expansion-treated Rice Husk

摘要

Expansion-treated rice husk (ERH) had been used as adsorbent for removing copper(Ⅱ) ions, and showed strong adsorption ability and removal efficiency for copper(Ⅱ) ions. In this paper, the surface and bulk structures of ERH adsorbent were investigated by X-ray photoelectron spectroscopy (XPS) and scanning electronic microscopy (SEM), ERH was treated by water solution with different pH value, and the adsorption performance of ERH for copper(Ⅱ) ions was investigated through adsorption static experiments in order to study the adsorption mechanism. The result showed that ERH treated by alkaline solution had high removal efficiency for copper(Ⅱ) ions, the reason ascribed to the large surface area of ERH. ERH had competitive adsorption for H~+ and Cu~(2+), and a monolayer adsorption process played an important role in the whole process.