Abstract: The spent mushroom compost of Lentinus edodes was used as a
biosorbent for adsorbing cadmium, lead and chromium from solutions under batch
conditions for the first time. Titration of the biomass revealed that it
contained at least three types of functional groups. The Fourier transform
infrared spectrometry showed that the carboxyl, phosphoryl, phenolic groups
were the main groups. The simulated values of PK_H and molar
quantity were 5.00 and 0.44 mmol/g, 7.32 and 1.38 mmol/g, 10.45 and 1.44
mmol/g, respectively. The biosorption ability increased with pH in acid
condition. When 10 mg/L biomass dosage was added in, there was no significant
increment of metal uptake. The maximum uptake estimated with the Langmiur
isotherm model were 833.33 mg/g for Cd (II), 1000.00 mg/g for Pb
(II) and 44.44 mg/g for Cr (III), respectively. All the
results showed that vast potential sorption capacity was existed in the biomass
for adsorbing these three kinds of metals studied.
Keywords: spent mushroom compost, characterization, biosorption, heavy metals
