Adsorption of Orange Ⅱ dye from aqueous solutions using phosphoric-acid modified clam shell powder

摘要

In this study, the clam shell, a waste biomaterial, was modified with phosphoric acid to improve the adsorption amount of Orange Ⅱ dye. The effects of initial concentration, contact time, and temperature on the adsorption were studied. The equilibrium adsorption data of Orange Ⅱ on the phosphoric acid-modified clam shell powder (PCSP) were adequately represented by Langmuir isotherm with an adsorption capacity of 1,017.13 mg/g, which is higher than that obtained using raw clam shell powder. Adsorption kinetics followed the pseudo-second-order rate expression. Thermodynamic parameters show that the process is exothermal, feasible, and spontaneous. The effect of temperature inferred that the type of adsorption in the study is a physical adsorption. Therefore, PCSP is an efficient and economical adsorbent for dye removal.