PREPARATION OF BIOSORBENTS FROM JATROPHA CURCAS LEAF FOR THE REMOVAL OF MALCHITE GREEN FROM AQUEOUS SOLUTION

Abstract

Malachite green used in textile and dyeing industries is a common persistent pollutant in wastewater and the environment causing major hazards to human health and aquatic organisms. The main objective of the study was to prepare biosorbent from Jatropha curcas leaf for the removal of malachite green from aqueous solution. Biosorbent was prepared from Jatropha curcas leaf using chemical activation method. Characterization techniques including FTIR and SEM analysis of biosorbent was evaluated. The FTIR analysis showed the presence of phenols, aromatic compound, lignin, ketone and aldehyde on biosorbent surface and after adsorption spectra revealed the great interaction of malachite green with the surface functional group of biosorbent. SEM analysis revealed that biosorbent was irregular, porous and heterogeneous, and after adsorption shows that great affinity of malachite green on the surface of biosorbent. The removal percentage and adsorption capacities of malachite green from aqueous solution was 99.6% and 49.8 mg/g was obtained at optimal condition of pH 8, 10 mg/L of initial concentration, 0.2 g/L of adsorbent dosage, 90 minutes of contact time and 45 . Freundlich model was best fit for removal of malachite green from aqueous solution than Langmuir due to its higher correlation coefficients and lower mean standard error (MSE) (R 2 : 0.99993, MSE:0.000055). Pseudo second order was well fitted for the adsorption of malachite green from aqueous solution than pseudo first order due to its higher coefficients and lower sum square error (SSE) (R2 :0.99999, SSE: 0.000051). Thermodynamic analysis presented that the adsorption process of malachite green from aqueous solution was employed spontaneous process and endothermic reaction. These findings suggest that the use of biosorbent prepared from Jatropha curcus was cost-effective for the removal of malachite green from contaminated environment.