Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology

A highly efficient reduction process of Cr (VI) with biochar was conducted in this paper. The results showed that nearly 100% reduced at selected reaction conditions: Dosage m (C)/m(Cr) = 3.0, temperature 90 °C, time of60 min, and concentration H2SO4 20 g/L. kinetics analysis demonstrated the fitted well pseudo-first-order model apparent activation energy calculated to be 40.24 kJ/mol. Response surface methodology confirmed all experimental parameters had a positive effect on (VI). influence each parameter followed order: biochar>concentration H2SO4>reaction >reaction time. This paper provides versatile strategy for treatment wastewater containing shows bright tomorrow treatment.