Back to Search Start Over

Synchronous removal of Cr(VI) and phosphates by a novel crayfish shell biochar-Fe composite from aqueous solution: Reactivity and mechanism.

Authors :
Yan, Liu
Dong, Fu-Xin
Li, Yu
Guo, Peng-Ran
Kong, Ling-Jun
Chu, Wei
Diao, Zeng-Hui
Source :
Journal of Environmental Chemical Engineering; Apr2022, Vol. 10 Issue 2, pN.PAG-N.PAG, 1p
Publication Year :
2022

Abstract

Nowadays, a great increasing attention has been paid to the coexistence of multiple inorganic pollutants in the environment. In this study, a novel crayfish shell biochar-Fe composite (FXB) was successfully produced and effectively used for the synchronous removal of Cr(VI) and phosphates (P) from aqueous solution. Experimental results revealed that FXB exhibited a high performance on the removal of Cr(VI) and P over a broader pH range. The escalating ionic strength and anions like Cl<superscript>-</superscript> and NO 3 <superscript>-</superscript> showed varying degrees of inhibition effects on Cr(VI) and P removal. The kinetic model of both Cr(VI) and P adsorption fit better with the pseudo-second-order model compared with the pseudo-first-order model. The isotherm of Cr(VI) fit well with the Langmuir model, whereas that of P adsorption fit well with the Freundlich model. Elovich model suggests that both Cr(VI) and P adsorption were the heterogeneous and multi-mechanism processes, and the intra-particle diffusion model confirms that these adsorption processes were dominated by surface and intra-particle diffusion reactions. Both Cr(VI) and P adsorption onto FXB were the spontaneous and endothermic nature. The synchronous removal of Cr(VI) and P could be efficiently achieved using this FXB composite under the certain conditions. A possible reaction mechanism for the synchronous adsorption of Cr(VI) and P onto FXB involving the synergistic effects of surface adsorption, precipitation, reduction and complexation processes was proposed. [Display omitted] • A novel crayfish shell biochar-Fe composite (FXB) was successfully obtained. • FXB exhibited the high Cr(VI) and P adsorption capacities at wide pH values. • Both Cr(VI) and P adsorption onto FXB were the spontaneous and endothermic nature. • The synchronous removal of Cr(VI) and P could be efficiently achieved with FXB. • The mechanism for the synchronous adsorption of Cr(VI) and P was proposed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
22133437
Volume :
10
Issue :
2
Database :
Supplemental Index
Journal :
Journal of Environmental Chemical Engineering
Publication Type :
Academic Journal
Accession number :
155630490
Full Text :
https://doi.org/10.1016/j.jece.2022.107396