ADSORPTION CAPACITY OF As(V) IN AQUEOUS SOLUTION OF ACTIVATED CARBON SYNTHESIZED FROM RICE HUSKS

Abstract

In this study, rice husks was used as a precursor to prepare the activated carbon. The procedure included
impregnation with HNO3 1M solution for 24 hours, then carbonization at 700 °C for 2 hours, then activation
with NaOH at 700 °C for 2 hours and stirred with (CH₃)₂NCH solvent.The morphology and phase structure
of AC materials were analyzed based on X-ray diffraction (XRD), energy dispersive X-ray spectroscopy
(EDX) and scanning electron microscopy (SEM). The nitrogen adsorption-desorption process was used to
determine the surface area (Brunauer - Emmett - Teller (BET)).The adsorption characteristic and As (V)
removal efficiency of the adsorbent have been determined by investigating the influence of operating
variables such as dosage of AC. The maximal removal capacity, determined using the AC Langmuir
isotherm, was 11.76 mg/g. This capacity was achieved under optimal conditions of 0.5 g AC per 100 mL, pH
6, 28 °C, and a contact time of 24 hours.