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Facile Ball-Milling Synthesis of CuO/Biochar Nanocomposites for Efficient Removal of Reactive Red 120
journal contribution
posted on 2020-03-11, 17:40 authored by Xiaoqian Wei, Xin Wang, Bin Gao, Weixin Zou, Lin DongWith the goal of improving the removal
of anionic contaminants,
copper oxide (CuO)-modified biochar (BC) nanocomposites were successfully
prepared through simply ball milling CuO particles with BC. The physicochemical
properties of the fabricated CuO/BC nanocomposites were systematically
characterized by a series of techniques; their adsorption performances
were assessed, and the main adsorption mechanism was revealed. X-ray
powder diffraction, Fourier transform infrared spectroscopy, and X-ray
photoelectron spectroscopy analyses of the nanocomposites showed the
strong interaction between CuO and BC and confirmed the success of
the ball-milling syntheses. Because of strong electrostatic attraction
between the embedded CuO nanoparticles and reactive red (RR120), the
composited adsorbents exhibited excellent RR120 removal. The 10%-CuO/BC
nanocomposite achieved the best RR120 removal efficiency (46%), which
is much higher than that of pristine BC (20%). In addition, the adsorption
was insensitive to the change of solution initial pH (4–10).
The 10%-CuO/BC also showed fast adsorption kinetics (equilibrium time <
3 h) and extremely high adsorption capacity (Langmuir maximum capacity
of 1399 mg g–1) to RR120 in aqueous solutions. Findings
from this study demonstrate not only the strong feasibility of ball-milling
synthesis of BC-based nanocomposites but also the promising potential
of the CuO/BC nanocomposites to remove aqueous anionic contaminants.
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Keywords
RR 120 removalCuO nanoparticlescomposited adsorbentsadsorption mechanismReactive Red 120BC-based nanocompositesball-milling synthesisX-ray photoelectron spectroscopy analysesX-ray powder diffractionequilibrium timeball-milling synthesesadsorption kineticsFacile Ball-Milling Synthesis3 hball milling CuO particlesEfficient Removalcopper oxideadsorption performancesphysicochemical propertiesadsorption capacityRR 120
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