Acid hydrolysed pine sawdust as an activated carbon low-cost substitute for Chromium(VI) adsorption

摘要

Batch kinetics of Chromium (Ⅵ) adsorption on sulfuric acid treated pine sawdust was simulated, using untreated pinesawdust as control, in order to explore the potential use of this low-cost adsorbent for wastewater Chromium (Ⅵ) removal. A SeverityFactor X was introduced to incorporate the effect of the pre-treatment time and the acid hydrolysis catalyst concentration on the pine sawdustadsorption properties. X is an explanatory variable for identifying biomass adsorption parameters as affected by the acid-treatment. Theestimated values of BET surface area, the Freundlich’s adsorption capacity, the Langmuir constants, the chromium (Ⅵ) maximum adsorbedamount, the chromium (Ⅵ) maximum removed percentage % and the first order rate constant value of the Lagergren equation indicate thatacid treatment enhanced the adsorption properties of the original material. These parameters, representing the adsorption propertiesimprovement, exhibited a satisfactory correlation when plotted vs. X.