College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, 701165, China.
Shaanxi Key Laboratory of Environmental Pollution Control Technology and Reservoir Protection of Oilfield, Xi'an, 701165, China.
Sci Rep. 2022 Jun 14;12(1):9821. doi: 10.1038/s41598-022-14142-9.
The co-pyrolysis of oily sludge with biomass to prepare carbon materials is not only an effective way to mitigate oily sludge pollution, but it is also a method of obtaining carbon materials. In this study, a carbon material (OS-CS AC) was obtained by the direct co-pyrolysis of oily sludge (OS) and corn stalks (CS) and then applied to Cr(VI) removal. According to the hydroxy and carboxy masking experiments and the characterization of OS-CS AC by FT-IR, SEM, XPS, XRD, and N physical adsorption-desorption, Cr(VI) can be adsorbed efficiently through pore filling, the surface oxygen-containing functional groups can promote the reduction of Cr(VI) to Cr(III) through electron donors, and the greater the electrostatic attraction between the electron-donating functional groups of OS-CS AC and the Cr(VI) is, the stronger the ability to remove Cr(VI). In addition, the removal process was discussed, and the results indicated that the McKay kinetic model, Langmuir isotherm model and Van't Hoff thermodynamic model were the most suitable models for removal. The main factors affecting the removal of Cr(VI) were discussed, and the removal of Cr(VI) reached 99.14%, which gives a comprehensive utilization way of oily sludge and corn stalks.
油泥与生物质共热解制备碳材料不仅是一种减轻油泥污染的有效方法，也是获得碳材料的一种方法。本研究通过油泥（OS）与玉米秸秆（CS）的直接共热解得到一种碳材料（OS-CS AC），并将其用于 Cr(VI)的去除。根据羟基和羧基掩蔽实验以及 OS-CS AC 的傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X 射线光电子能谱（XPS）、X 射线衍射（XRD）和比表面积及孔径分布（N 物理吸附-脱附）的表征可知，Cr(VI)可通过孔隙填充被高效吸附，表面含氧官能团可通过电子供体促进 Cr(VI)还原为 Cr(III)，OS-CS AC 中供电子官能团与 Cr(VI)之间的静电引力越大，去除 Cr(VI)的能力越强。此外，还讨论了去除过程，结果表明 McKay 动力学模型、Langmuir 等温模型和 Van't Hoff 热力学模型最适合该去除过程。讨论了影响 Cr(VI)去除的主要因素，Cr(VI)的去除率达到 99.14%，为油泥和玉米秸秆的综合利用提供了一种方法。
