Preparing the adsorption material from coconut trunk to remove As(V) in aqueous solution

Abstract

Coconut trunks were used as raw materials to manufacture As(V) adsorbent materials in aqueous solution. The biochar AC700 was prepared by heating coconut trunk biomass at 700 ^oC for 1 hour. The AC700 material was modified by 1.5 M H₃PO₄ solution to form the AC700/H₃PO₄ material. The material ‘s  structure was characterized by X-ray diffraction, FT-IR, SEM, EDS, and the BET method. The specific surface area of AC700 and AC700/H₃PO₄ material are 448.136 m².g^-1 and 732.373 m².g^-1, respectively. The study on adsorption kinetic models and adsorption isotherms indicated that the As(V) adsorption process by AC700/H₃PO₄ followed the pseudo-first-order kinetic model and the Langmuir adsorption isotherm model. The prepared material can effectively remove the As(V) in aqueous solution. The density functional theory calculation simulated the hydrogen interaction between material and As(V), so material can absorb the As(V) in aqueous solution.