Department of Agricultural Chemistry and Food Science & Technology (Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, South Korea.
Department of Bio-Environmental Sciences, Sunchon National University, Suncheon 57922, South Korea.
Ecotoxicol Environ Saf. 2021 Jan 15;208:111690. doi: 10.1016/j.ecoenv.2020.111690. Epub 2020 Nov 26.
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 RACR-C500 (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 (C˭C and C-O), precipitation of Cd-P and ion exchange reaction by exchangeable cation occurring rather than by a single specific mechanism.
本研究旨在通过热解低可回收利用的废弃猪尸体的固体残渣来制备肉骨粉残渣炭（RACR-C），并评估其对镉（Cd）的吸附特性和机制。随着热解温度的升高，RACR-C 的无机含量增加，而碳含量减少。特别是，通过 SEM-EDS、XRD、XRF、TGA 和 FTIR 很好地描述了在不同热解温度下制备的 RACR-C 的表面结构和化学性质。RACR-C 的 Cd 吸附特性与 Langmuir 等温线和准二级模型吻合较好，不同热解温度下制备的 RACR-C 的 Cd 吸附容量顺序为 RACR-C500（73.5mg/g）>RACR-C600（53.8mg/g）>RACR-C400（41.5mg/g）>RACR-C250（15.9mg/g）。内扩散模型表明，RACR-C 对 Cd 的吸附受内部扩散和外部边界的影响很大。由于 RACR-C 的 Cd 吸附容量受初始剂量、pH 值和共存金属的影响很大，因此在处理含重金属废水时，需要对这些影响因素进行管理。我们的结果表明，RACR-C 对 Cd 的吸附是一种复杂的吸附现象，涉及多种机制，如官能团（C˭C 和 C-O）的吸附、发生的 Cd-P 沉淀和可交换阳离子的离子交换反应，而不是单一的特定机制。
