Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/78823
Title: Fabrication and characterization of hydrophilic corn stalk biochar-supported nanoscale zero-valent iron composites for efficient metal removal
Authors: Yang, F 
Zhang, S
Sun, Y 
Cheng, K
Li, J 
Tsang, DCW 
Keywords: Engineered biochar
Potentially toxic elements
Waste biomass valorization
NZVI-carbon composites
Iron-based nanomaterials
Wastewater treatment
Issue Date: 2018
Publisher: Elsevier
Source: Bioresource technology, Oct. 2018, v. 265, p. 490-497 How to cite?
Journal: Bioresource technology 
Abstract: Pyrolyzing low-cost agro-waste into biochar is a promising means for waste biomass utilization. This study engineers corn stalk-derived biochar with abundant hydrophilic functional groups as a support material for iron nanoparticles impregnation (nZVI-HCS). Surface chemistry and morphology of nZVI-HCS composites is characterized by SEM, TEM, TG, XRD, FTIR, XPS, and BET techniques, which helps to elucidate the mechanisms of Pb-2(+), Cu-2(+) and Zn-2(+) removal from single and mixed-metal solutions in batch experiments. Equilibrium adsorption capacities can reach 195.1, 161.9 and 109.7 mg.g(-1) for Pb-2(+), Cu-2(+) and Zn-2(+) at neutral medium after 6-h process, respectively. The engineered biochar with hierarchical pores can impregnate iron nanoparticles, serve as an adsorbent, and enhance metal reduction/precipitation. Rapid removal and high performance can be maintained after five regeneration/reuse cycles. Multiple interaction mechanisms including adsorption, precipitation, reduction and complexation are responsible for metal removal by nZVI-HCS composites, which can be a novel biowaste-derived material for wastewater treatment.
URI: http://hdl.handle.net/10397/78823
ISSN: 0960-8524
EISSN: 1873-2976
DOI: 10.1016/j.biortech.2018.06.029
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