Mercury (II) ion adsorption performance of Cl-loaded carbonaceous material prepared by chlorination of pyrolyzed rice husk char

The objective of this study was to elucidate in detail the Hg adsorption performance of Cl-loaded carbons obtained after chlorination of rice husk char (RC). Firstly, chlorine content/morphology/porosity of Cl-loaded carbons prepared were investigated. Subsequently, Hg adsorption performance of Cl-loaded carbon was tested. The effect of Cl on Hg adsorption was then investigated by comparing the adsorption performance of Cl-loaded carbons prepared from RC and demineralized RC (DRC). Cl content of RC and DRC reached a maximum value at 600 degrees C, and then decreased by 1000 degrees C. The pore properties of RC chlorinated residue increased with increasing chlorination temperature. The Hg adsorption performance of the RC chlorinated residues increased with increasing chlorination temperature. The maximum Hg adsorption capacity of RC chlorinated residue obtained at 1000 degrees C, 10min reached 620 mg/g; the capacity of chlorinated residue treated with DRC at 1000 degrees C, 10min was larger than that of DRC chlorinated at 600 IIC, which is largest Cl content. The adsorption kinetics and isotherm could be expressed by pseudo-first-order and Langmuir equations, respectively. The comparison of the porosity and Hg adsorption of DRC and RC chlorinated residue obtained at 1000 degrees C, 10min indicated that Cl-adsorbed on the carbon in RC during chlorination may also be involved in Hg adsorption. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This study aimed to investigate the Hg adsorption performance of Cl-loaded carbons obtained from chlorination of rice husk char. The results showed that the chlorine content, morphology, and porosity have an impact on Hg adsorption, and the enhancement of Hg adsorption by Cl is positively correlated with the chlorination temperature.