Removal of chromium (VI) heavy metal ions through biosorption using betel seeds from aqueous solution

Abstract

<p>The reduction of highly toxic Cr (VI) from industrial wastewater of low concentration by different low-cost ample sorbent materials was investigated. In order to remove Cr (VI) from aqueous solutions, the biosorption properties of natural waste (Betel Seeds) were investigated with varying several parameters like contact period, sorbent dose, sorbate sorption, and pH. The study's contact period, biosorbent dosage, sorbate concentration, and pH were all varied from 0 to 120 minutes, 12 g/l, 40 mg/l, and 2 to 7, respectively. According to the study, chromium sorption by betel seed powder reached equilibrium after 60 minutes, and a small change in chromium removal effectiveness was then noticed (Gode, et.al., 2003). At pH 3 and doses of 12 g/l and 30 mg/l of sorbent and sorbate, the maximum removal of chromium (99.2%) was achieved. The results revealed that chromium(VI) biosorption follows the Langmuir isotherm comparison with a correlation factor of 0.998. Additionally, the biosorption process's kinetics adheres to the pseudo-second-order kinetics model, with a rate constant of 0.721 min-1 and the rate constant was evaluated at 30°C. Hexavalent chromium in water was quantified using a UV-VIS spectrophotometer. A desorption examination was also carried out, and it is vital by 0.5H2SO4. Results indicate that the cheap, readily available, widely cultivated sorbent can be used to effectively remove chromium ions.</p>