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Bamboo-char supported nano zero-valent iron (BC-nZVI) for water remediation
Proceedings of the 2022 Mississippi Water Resources Conference
Year: 2022 Authors: Karunaratne T.
The use of nano zero-valent iron (nZVI) on water remediation applications have not been fully explored because of its agglomeration and rapid passivation. Biochar has been widely used to provide the stability to nZVI by preventing its agglomeration. Herein, a series of bamboo-char supported nZVI composites (BC-nZVI) are synthesized via a carbothermal reduction of iron salts using bamboo-char as a reduction source. BC-nZVI consists of nZVI particles with diameters ranging from 20 to 200 nm that are evenly distributed on the bamboo-char matrix. The effects of iron salt type (i.e., Fe(NO3)3, FeSO4, FeCl2, and FeCl3), carbothermal reduction temperature (600-1000 &8451;C), iron loading (5-40%) on the synthesized structure, morphology, and heavy metal (Cu2+ and Pb2+) removal performance of BC-nZVI are evaluated. At the optimum condition (i.e., FeCl2, 15% iron loading, and 1000 &8451;C), the as-synthesized BC-nZVI exhibits high Langmuir adsorption capacities of 100.4, and 63.9 mg/g for Cu(II), and Pb(II) respectively. This study suggests that carbothermal reduction could be a promising route and a green alternative path of borohydride reduction for the production of BC-nZVI for water remediation.