Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil; Department of Applied Chemistry, University of Ngaoundere, P.O. Box 455, Ngaoundere, Cameroon.
Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil.
J Colloid Interface Sci. 2017 Jan 15;486:163-175. doi: 10.1016/j.jcis.2016.09.070. Epub 2016 Sep 29.
First-row transition metals (Co, Ni, Cu and Zn) were successfully used in the preparation of activated carbons from wood biomass via microwave-assisted irradiation. Physical-chemical properties of the produced materials (MWAC) were studied by nitrogen adsorption-desorption curves, SEM, FTIR, UV-vis DRS and synchronous fluorescence spectroscopy, CHN elemental analysis, TGA/DTG, pH, hydrophobic properties, and total acidity and basicity groups. Results showed that the metals were bound successfully in different amounts with surface functional groups of the wood biomass through ion exchange and surface complexation interaction during the impregnation step. Zn and Cu formed the most complexes. MWAC impregnated with Zn showed higher pore volumes and surface areas, followed by Cu, Co and Ni, independently of the ratio used. As the metal : biomass ratio was increased from 0.5 to 2, the surface area of MWAC increased from 300 to 620mg for Co-MC, 260 to 381mg for Ni-MC, 449 to 765mg for Cu-MC and from 572 to 1780mg for Zn-MC. The samples showed high values of carbon contents and oxygen-containing groups. An adsorption experiment revealed that samples prepared using ZnCl showed the highest sorption capacities (q) for the tested adsorbates, followed by CuCl, CoCl and NiCl. These results matched with the surface areas and pore volumes trends, which were found to follow atomic number and melting point trends-Ni(II)<Co(II)<Cu(II)<Zn(II), rather than the Irving-Williams Series. The sorption capacities (q) of molecules followed this order: 2-nitro phenol>bisphenol A>hydroquinone>4-nitro phenol>2-naphtol>paracetamol>caffeine>resorcinol.
第一过渡金属（Co、Ni、Cu 和 Zn）成功地被用于通过微波辅助辐照从木质生物质制备活性炭。通过氮气吸附-解吸曲线、SEM、FTIR、UV-vis DRS 和同步荧光光谱、CHN 元素分析、TGA/DTG、pH 值、疏水性、总酸度和总碱度基团研究了所制备材料（MWAC）的物理化学性质。结果表明，在浸渍步骤中，金属通过离子交换和表面络合相互作用成功地以不同的量结合到木质生物质的表面官能团上。Zn 和 Cu 形成了最多的配合物。用 Zn 浸渍的 MWAC 表现出更高的孔体积和表面积，其次是 Cu、Co 和 Ni，而与使用的比例无关。随着金属：生物质比从 0.5 增加到 2，Co-MC 的比表面积从 300 增加到 620mg，Ni-MC 从 260 增加到 381mg，Cu-MC 从 449 增加到 765mg，Zn-MC 从 572 增加到 1780mg。样品表现出高的碳含量和含氧基团值。吸附实验表明，使用 ZnCl 制备的样品对测试的吸附剂表现出最高的吸附容量（q），其次是 CuCl、CoCl 和 NiCl。这些结果与表面积和孔体积趋势相匹配，这些趋势遵循原子数和熔点趋势-Ni(II)<Co(II)<Cu(II)<Zn(II)，而不是 Irving-Williams 系列。分子的吸附容量（q）遵循以下顺序：2-硝基苯酚>双酚 A>对苯二酚>4-硝基苯酚>2-萘酚>对乙酰氨基酚>咖啡因>间苯二酚。
