Arsenic (III) removal from water by hydroxyapatite-bentonite clay-nanocrystalline cellulose

In the present study, natural, non-toxic nano size adsorption material: hydroxyapatite-bentonite clay-nanocrystalline cellulose (CHA-BENT-NCC) was successfully prepared for As(III) removal from water solution. The efficiency of this composite material was investigated as a function of solution pH, time, As(III) concentration, and temperature. The chemical and morphological structures of adsorbent were investigated by scanning electron microscopy (SEM), energy dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). Results of the kinetic study revealed that the adsorption rate was very high in the beginning and over 95% of As(III) removal was achieved within the first 5 min. The kinetics of As(III) on CHA-BENT-NCC complied with the pseudo-first-order model. The maximum uptake was 51.01 mg/g by Langmuir model and 48.99 mg/g by Dubinin-Radushkevich model. The preservation of As(III) specification was studied as function of time using three different storage method. (c) 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019