Comparison of natural organic matter adsorption capacities of super-powdered activated carbon and powdered activated Carbon.
Comparison of natural organic matter adsorption capacities of super-powdered activated carbon and powdered activated Carbon.
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DOI：
10.1016/j.watres.2010.05.029
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发表时间：
2010-07
期刊：
影响因子：
12.8
通讯作者：
Naoya Ando;Y. Matsui;Ryuji Kurotobi;Y. Nakano;T. Matsushita;K. Ohno
中科院分区：
文献类型：
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作者：
Naoya Ando;Y. Matsui;Ryuji Kurotobi;Y. Nakano;T. Matsushita;K. Ohno
我们研究了超粉活性炭 (S-PAC) 的天然有机物 (NOM) 吸附特性，该超粉活性炭 (S-PAC) 是通过将市售普通 PAC 粉碎至亚微米粒径范围而生产的。 S-PAC 对 NOM 和分子量 (MW) 为 1.1、1.8 和 4.6 kDa 的聚苯乙烯磺酸盐 (PSS)（我们用作模型化合物）的吸附能力明显高于 PAC。所测试的所有五种碳（两种木质碳、两种椰子碳和一种煤基碳）均观察到吸附能力增加。 S-PAC和PAC对MW为0.3和1.0的聚乙二醇(PEG)的吸附能力相同。 S-PAC 对分子量为 3.0 和 8.0 kDa 的 PEG 的吸附容量略高于 PAC 的吸附容量，但吸附容量的差异并不像 NOM 和 PSS 观察到的那么大，尽管吸附物的分子量范围相似。我们得出的结论是，对于 NOM 和 PSS 观察到的 S-PAC 和 PAC 之间的吸附能力差异是由于两种碳之间的粒径差异造成的，而不是由于内部孔径或结构的差异、活化的差异或由于粒径变化而导致未达到平衡。具有高比紫外吸光度 (SUVA) 值的 NOM 比低 SUVA NOM 的 S-PAC 和 PAC 之间的吸附能力差异更大。与 PAC 相比，S-PAC 具有更大的吸附能力，这是因为单位质量的比外表面积更大。我们假设较小粒径的碳可以进入较大部分的内部孔体积，因为 NOM 和 PSS 分子优先吸附在颗粒的外表面附近，因此不会完全渗透吸附剂颗粒。
We examined the natural organic matter (NOM) adsorption characteristics of super-powdered activated carbon (S-PAC) produced by pulverizing commercially available, normal PAC to a submicron particle size range. The adsorption capacities of S-PAC for NOM and polystyrene sulfonates (PSS) with molecular weights (MWs) of 1.1, 1.8, and 4.6 kDa, which we used as model compounds, were considerably higher than those of PAC. The adsorption capacity increases were observed for all five types of carbon tested (two wood-based, two coconut-based, and one coal-based carbon). The adsorption capacities of S-PAC and PAC for polyethylene glycols (PEGs) with MWs of 0.3 and 1.0 were the same. The adsorption capacities of S-PAC for PEGs with MWs of 3.0 and 8.0 kDa were slightly higher than the adsorption capacities of PAC, but the difference in adsorption capacity was not as large as that observed for NOM and the PSSs, even though the MW ranges of the adsorbates were similar. We concluded that the adsorption capacity differences between S-PAC and PAC observed for NOM and PSSs were due to the difference in particle size between the two carbons, rather than to differences in internal pore size or structure, to differences in activation, or to non-attainment of equilibrium that resulted from the change in particle size. The difference in adsorption capacity between S-PAC and PAC was larger for NOM with a high specific UV absorbance (SUVA) value than for low-SUVA NOM. The larger adsorption capacities of S-PAC compared with PAC were explained by the larger specific external surface area per unit mass. We hypothesize that a larger fraction of the internal pore volume is accessible with carbon of smaller particle size because the NOM and PSS molecules preferentially adsorb near the outer surface of the particle and therefore do not completely penetrate the adsorbent particle.