State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Sci Total Environ. 2018 Nov 15;642:1050-1059. doi: 10.1016/j.scitotenv.2018.06.115. Epub 2018 Jun 19.
Black carbon was produced by slow pyrolysis under an oxygen-limited condition at 500 °C, and was modified by some chemical methods (oxidation, hydrolysis, activation, and surface recombination). The modified samples were characterized by using elemental analysis, Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) surface analysis, Boehm titration, cation exchange capacity(CEC)analysis, CO adsorption analysis, and then used to investigate the sorption behavior of phenanthrene. The results showed that the activation of ZnCl gave a maximum nanopore volume of 96.5 μL/g and a specific surface area of 241 m/g, while the oxidation of NaClO gave a minimum nanopore volume of 63.3 μL/g and a specific surface area of 158 m/g. The FTIR, XPS, and Boehm titration analysis showed that the new oxygen-containing functional groups were introduced during the oxidation treatments of HO and NaClO. The sorption of phenanthrene on all samples was typically nonlinear, and the nonlinear factor (n) was negatively correlated with V, especially with V at 0-1.1 nm. The sorption parameter (log K) was positively correlated with nanopore volume (V) and specific surface area (SSA). Moreover, the model analysis showed that the nanopore filling was the main sorption mechanism, and molecular sieve effect was observed in the sorption of phenanthrene.
黑碳是在 500°C 缺氧条件下通过慢速热解产生的，并通过一些化学方法（氧化、水解、活化和表面重组）进行改性。改性后的样品采用元素分析、傅里叶变换红外光谱（FTIR）、X 射线光电子能谱（XPS）表面分析、Boehm 滴定、阳离子交换容量（CEC）分析、CO 吸附分析进行了表征，然后用于研究菲的吸附行为。结果表明，ZnCl 的活化得到了最大的纳米孔体积为 96.5 μL/g 和比表面积为 241 m/g，而 NaClO 的氧化得到了最小的纳米孔体积为 63.3 μL/g 和比表面积为 158 m/g。FTIR、XPS 和 Boehm 滴定分析表明，在 HO 和 NaClO 的氧化处理过程中引入了新的含氧官能团。所有样品对菲的吸附均呈典型的非线性，非线性因子（n）与 V 呈负相关，特别是与 0-1.1nm 的 V 呈负相关。吸附参数（log K）与纳米孔体积（V）和比表面积（SSA）呈正相关。此外，模型分析表明，纳米孔填充是主要的吸附机制，在菲的吸附中观察到分子筛效应。
