Cysteine chemical modification for surface regulation of biochar and its application for polymetallic adsorption from aq
- PDF / 3,172,267 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 71 Downloads / 204 Views
RESEARCH ARTICLE
Cysteine chemical modification for surface regulation of biochar and its application for polymetallic adsorption from aqueous solutions Baoqing Li 1,2 & Jiaxin Gong 2 & Jianzhang Fang 1,3,4 & Zhiran Zheng 2 & Wei Fan 2 Received: 11 May 2020 / Accepted: 17 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Biochar (BC) has been widely used to remove heavy metals from wastewater. However, due to the hydrophobicity of BC and the lack of its surface functional groups, the effect of metal ions adsorption onto BC is limited. In order to improve the adsorption efficiency, L-cysteine was used to modify biochar derived from pomelo peel (PP) to regulate surface structure. The characteristics of BC and cysteine/biochar composite (cys/BC) were analyzed by various characterization methods. Results showed that the hydrophilicity of biochar was enhanced, and the number of surface functional groups was increased, resulting to strong adsorption ability of Ag(I) (618.9 mg/g), Pb(II) (274.5 mg/g), and As(V) (34.7 mg/g) for cys/BC, which increased approximately by 15%, 35%, and 29% compared with that of BC, respectively. The adsorption process of Pb(II) onto cys/BC was fitted better by the Freundlich isotherm model and for Ag(I) and As(V) by the Langmuir isotherm model. Moreover, the adsorption kinetics followed pseudo-second-order equation and the adsorption process was controlled by the intraparticle diffusion for Ag(I), Pb(II), and As(V) adsorption onto cys/BC. In addition, the adsorption capacities of cys/BC for Ag(I), Pb(II), and As(V) decreased slightly after five adsorption/desorption cycles. Finally, the multiple adsorption mechanisms including functional groups, pore adsorption, surface complexation, and cations-π were analyzed. The paper demonstrated that the cys/BC composite could be reused as effective adsorbents for removing contaminants in the environment. Keywords Functionalized biochar . Pomelo peel . Biochar . Heavy metal ions . Adsorption
Responsible Editor: Zhihong Xu Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10558-w) contains supplementary material, which is available to authorized users. * Baoqing Li [email protected]
3
Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China
4
Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou 510006, China
* Jianzhang Fang [email protected] 1
School of Environment, South China Normal University, Guangzhou 510006, China
2
Guangdong Engineering and Technology Research Center of Solid Waste Resource Recovery and Heavy Metal Pollution Control, Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China
Environ Sci Pollut Res
Introduction In recent years, the rapid development of economy results in the discharge of toxic wastes into the
Data Loading...
