Kinetics and thermodynamics of Cr (VI) reduction by Tamarindus indica methanol leaves extract under optimized reaction conditions

Abstract Environmental contamination with Cr (VI) has recently attracted public attention because of its high concentration in soil and wastewater originating majorly from anthropogenic activities natural processes. Reduction to (III) is a feasible method for minimizing chromium pollution. This work aimed at characterizing the effects reduction conditions batch experiment such as temperature, hydrogen ion concentration, time, reactant concentrations, well kinetics thermodynamics reaction using Tamarindus indica methanol leaves extract reductant. was meaningfully affected by concentrations. The followed pseudo-second-order kinetic model ( R 2 = 0.997) pH 2; neutral alkaline (7 9), predominantly obeyed first order 0.988) pseudo-first 0.758), respectively. Under various retains negative free energies, enthalpy change, positive entropy. findings this study suggested be spontaneous, exothermic, orderly unstable. We concluded that phytocompounds present tamarind demonstrated strong potentials converting and, thus, could applicable contaminated treatment.