Department of Environmental Engineering, Zhejiang University, Hangzhou, People's Republic of China.
J Colloid Interface Sci. 2011 Sep 1;361(1):226-31. doi: 10.1016/j.jcis.2011.05.015. Epub 2011 May 17.
Acid treatment is a routine demineralization process to obtain black carbon (BC), but there has been little systematic research about its influence on BC's characteristics. In this study, elemental analysis, SEM, FTIR, and Boehm titration were used to investigate that effect. Our results showed that the acid treatment had little influence on the sorption of fly ash and soot to pentachlorophenol (PCP), but it greatly increased the sorption of rice chars to PCP. There were two competing effects of acid demineralization on the adsorption capacity of BC. On one hand, it increased the amount of the acidic functional groups, which decreased the adsorption capacity. On the other hand, it increased the surface and pore volume of BC and caused the emergence of hidden carbon enclosed by minerals, which in turn increased the sorptivity significantly. Especially for rice chars (600°C), after acid treatment, their surface area increased from 3.52 to 235 m(2) g(-1) and the sorption capacity coefficient increased from 2.12 to 4.10.
酸处理是一种常规的脱矿过程，用于获得黑碳（BC），但对于其对 BC 特性的影响，几乎没有系统的研究。在这项研究中，我们使用元素分析、SEM、FTIR 和 Boehm 滴定法来研究这种影响。结果表明，酸处理对飞灰和烟尘吸附五氯苯酚（PCP）的影响较小，但大大增加了水稻炭对 PCP 的吸附。酸脱矿对 BC 吸附能力有两种相互竞争的影响。一方面，它增加了酸性官能团的数量，从而降低了吸附能力。另一方面，它增加了 BC 的表面积和孔体积，并导致矿物质封闭的隐藏碳的出现，这反过来又显著增加了吸附性。特别是对于稻壳炭（600°C），经过酸处理后，其比表面积从 3.52 增加到 235 m(2) g(-1)，吸附系数从 2.12 增加到 4.10。
