Evaluation of a pH- and time-dependent model for the sorption of heavy metal cations by poultry litter-derived biochar.

ABSTRACT: Common isotherm and kinetic models cannot describe the pH-dependent sorption of heavy metal cations by biochar. In this paper, we evaluated a pH-dependent, equilibrium/kinetic model for describing the sorption of cadmium (Cd), copper (Cu), nickel (Ni), lead (Pb), and zinc (Zn) by poultry litter-derived biochar (PLB). We performed sorption experiments across a range of solution pH, initial metal concentration, and reaction time. The sorption of all five metals increased with increasing pH. For Cd, Cu, and Pb, kinetics experiments demonstrated that sorption rates were greater at pH 6.5 than at pH 4.5. For each metal, all sorption data were described using single set of four adjustable parameters. Sorption edge and isotherm data were well described with R² > 0.93 in all cases. Time

SUBMITTER: Padilla JT 

PROVIDER: S-EPMC10764054 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature