Micro-Structure, Surface Properties And Adsorption Capacity Of Ball-Milled Cellulosic Biomass Derived Biochar Based Mineral Composites Synthesized Via Carbon-Bed Pyrolysis
APPLIED CLAY SCIENCE(2020)
摘要
Given the increase in global threats to the environment and the growth in energy demand, there is great interest in developing renewable and green biochar-based materials. This article investigated ball-milled cellulosic biochar-based composites incorporating minerals (montmorillonite, calcite, or quartz) synthesized by an in situ carbon-bed pyrolysis method. The synthesized samples were examined using X-ray powder diffraction (XRD), scanning and transmission electron microscopy (SEM, TEM), N-2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy (FTIR), thermogravimetry-differential thermal analysis (TG-DTA), Raman spectroscopy, and organic dyes adsorption analysis. It was shown that the mineral components incorporated during ball-milling modified the microstructure, morphology, and surface properties of biochar composites. Synergistic effects of oxygen functional groups and mesoporous layered structure contributed to the functionalization and surface modification of biochar-based montmorillonite composites, as reflected by a remarkably enhanced adsorption performance of organic dyes. Freundlich isotherm and pseudo-second-order kinetic models were found to provide an accurate description of the chemical adsorption of MB onto the heterogeneous surface of the biochar-based montmorillonite composite via cation exchange.
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关键词
Biochar, Clay, Cellulose, Ball-mill, Aqueous adsorption
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