Journal
CHEMOSPHERE
Volume 195, Issue -, Pages 135-145Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.12.043
Keywords
Agro-wastes; Tanzania; Biochar; Lead; Biosorption
Categories
Funding
- Korea Environmental Industry & Technology Institute (KEITI) - Korea Ministry of Environment (MOE) [2016001970001]
Ask authors/readers for more resources
Corn and rice husks, agro-wastes available in large quantities in Tanzania, were used to remove Pb2+ from aqueous solution. Husks were used in raw form, pyrolyzed form, and chemically modified form. Material characterization was carried out using the BET method, FTIR spectroscopy, SEM, pH(pzc), and cation exchange capacity analysis. Langmuir, Freundlich, Dubinin-Radushkevich (D-R), and Temkin isotherms were used to elucidate Pb2+ sorption mechanisms. The surface area and cation exchange capacity (CEC) of untreated and chemically treated biochars were significantly higher than that of raw husks. Sorption data for Pb2+ for all biosorbents fit the Freundlich and D-R models well with high R-2 values. Most of the synthesized biosorbents in this study indicated >90% for Pb2+ removal, with the ZnCl2-treated corn husk biochar sorption capacities ranking highest in all modeling results. Surface morphological features (e.g., micropores and fissures) and acidic and unsaturated functional groups may have significantly contributed to the observed Pb2+ removal efficiencies. (C) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available