Journal
BIORESOURCE TECHNOLOGY
Volume 265, Issue -, Pages 490-497Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.06.029
Keywords
Engineered biochar; Potentially toxic elements; Waste biomass valorization; nZVI-carbon composites; Iron-based nanomaterials; Wastewater treatment
Funding
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2017018]
- National Nature Science Fund for Young Scholars [31600413]
- Young Talents Project of Northeast Agricultural University [17XG03]
- Hong Kong Research Grants Council [PolyU 15222115, 15223517]
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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.
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