Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 5 March 2021 / Approved: 5 March 2021 / Online: 5 March 2021 (21:02:17 CET)

How to cite: Peng, H.; Guo, J. Efficient Removal of Cr (VI) with Biochar and Parameters Optimized by Response Surface Methodology. Preprints 2021, 2021030193 (doi: 10.20944/preprints202103.0193.v1). Peng, H.; Guo, J. Efficient Removal of Cr (VI) with Biochar and Parameters Optimized by Response Surface Methodology. Preprints 2021, 2021030193 (doi: 10.20944/preprints202103.0193.v1).

Abstract

A highly efficient reduction process of Cr (VI) with biochar was conducted in this paper. The results showed that nearly 100% Cr (VI) was reduced at selected reaction conditions: the dosage of biochar at m (C)/m(Cr) = 3.0, reaction temperature of 90 ℃, reaction time at 60 min and concentration of H2SO4 of 20 g/L, respectively. The reduction kinetics analysis demonstrated that the reduction of Cr (VI) fitted well with the pseudo-first-order model and the apparent activation energy was calculated to 40.24 kJ/mol. Response surface methodology confirmed that all the experimental parameters had positive effect on the reduction of Cr (VI). The influence of each parameter on the reduction process followed the order: dosage of biochar> Concentration of H2SO4 > Reaction Temperature > Reaction Time. This paper provided a versatile strategy for treatment of wastewater containing Cr (VI) and showed a bright tomorrow for wastewater treatment.

Subject Areas

Chromium; Response surface methodology; Reduction; Biochar

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