Removal of Chromium from Aqueous Solution Using Ziziphus jujuba Seed-Activated Biochar

The present study aims to remove chromium (Cr) from a synthetic solution using Ziziphus jujube seed (ZJS)-activated biochar (ZJSAB) as an adsorbent. Physicochemical characterization was carried out to understand the properties of ZJSAB samples. Adsorption characteristics of ZJSAB were determined using batch experiments for various temperatures, pH, dosage, concentration, and duration. The study reveals ZJSAB has 93 % efficiency in the removal of Cr for an initial concentration of 60 mg L-1 at 30 degrees C and 2 pH with 0.6 g L-1 dosage and 120 min duration. Freundlich isotherm and pseudo-second-order models were best fit with maximum removal efficiency for ZJSAB. When 0.3 N hydrochloric acid was introduced to a desorption study, Cr desorption was 93.47 %. The study reveals that activated biochar from ZJS was efficient for Cr removal from aqueous solutions.