Removal of potentially toxic metal by biochar derived from rendered solid residue with high content of protein and bone tissueopen access
- Park, Jong-Hwan; Yun, Jin-Ju; Kang, Se-Won; Kim, Seong-Heon; Cho, Ju-Sik; Wang, Jim J.; Seo, Dong-Cheol
- Issue Date
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Rendering; Animal carcass; Char; Adsorption; Pyrolysis
- ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v.208
- Journal Title
- ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
- The purpose of this study was to produce rendering animal carcass residue char (RACR-C) by pyrolyzing the solid residues of low-recyclable rendered pig carcasses and to evaluate their cadmium (Cd) adsorption characteristics and mechanisms. As the pyrolysis temperature increased, the inorganic content of RACR-C increased, while the carbon content decreased. In particular, the surface structure and chemistry of RACR-Cs prepared at different pyrolysis temperatures were well described by SEM-EDS, XRD, XRF, TGA, and FTIR. The Cd adsorption characteristics of RACR-C were in good agreement with the Langmuir isotherm and pseudo-second-order models, and the Cd adsorption capacities of RACR-Cs prepared at various pyrolysis temperatures were in the order of RACRC500 (73.5 mg/g) > RACR-C600 (53.8 mg/g) > RACR-C400 (41.5 mg/g) " RACR-C250 (15.9 mg/g). The intraparticle diffusion model suggested that the adsorption of Cd by RACR-C is greatly influenced by internal diffusion as well as external boundary. Since the Cd adsorption capacity of RACR-C is greatly influenced by the initial dosage, pH, and co-existing metals, it is necessary to manage these influencing factors when treating wastewater containing heavy metals. Our results suggest that Cd adsorption by RACR-C is a complex adsorption phenomenon by various mechanisms such as adsorption by functional group (CC and C-O), precipitation of Cd-P and ion exchange reaction by exchangeable cation occurring rather than by a single specific mechanism.
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