Abstract
The mycelia pellets of Penicillium simplicissimum impregnated with powdered biochar (MPPSIPB) were synthesized and applied to remove chromium (VI) from aqueous solution. The effects of pH, MPPSIPB dosage, initial Cr(VI) concentration, and contact time were investigated via batch experiments. Results indicated that the percentage removal of Cr(VI) was significantly dependent on the pH of the solution. Ten grams mycelial pellets and 0.2 g powdered biochar could form the most stable pellets. The maximum value of biosorption of Cr(VI) was 28.0 mg/g. Scanning electron microscopy (SEM) analysis showed that the mycelia pellets of Penicillium simplicissimum had abundant filamentous network, which entrapped powdered biochar firmly. Fourier transform infrared (FTIR) analysis suggested that O‒H, N‒H, C‒H, C˭O, and C‒OH groups from MPPSIPB were involved in chromium binding and the subsequent reduction. Kinetic studies indicated that the pseudo-second-order equation fit best for Cr(VI) removal from aqueous solution. Freundlich isotherm was found to apply better for the adsorption equilibrium data with respect to the Langmuir isotherm. Furthermore, MPPSIPB can be separated from aqueous solution completely by filtration. Both experimental study and modeling results indicated that MPPSIPB exhibited remarkable affinity for chromate and had a potential application in Cr(VI) removal from water.