College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
Bioresour Technol. 2018 Feb;250:806-811. doi: 10.1016/j.biortech.2017.11.052. Epub 2017 Nov 20.
In this study, a novel approach was developed to prepare engineered hydrochar from KMnO treated bamboo residues through hydrothermal carbonization. The hydrochar yields were within a specified range of 61.8-67.8% at 180 °C and 39.8-45.0% at 260 °C, respectively. The higher temperature led to the higher C content, lower H/C and O/C ratio, whereas the ash content increased with increasing KMnO concentration, causing the increase of solid yield as well as the decrease of C content. Pseudo-second kinetic model was optimal to describe bamboo hydrochar's hygroscopic dynamic, and the engineered hydrochar produced at 260 °C and 1.0 wt% concentration obtained the better hydrophobicity of 0.82%. SEM-EDS and XRD analysis confirmed the existence of manganese carbonate on the surface of engineered hydrochar, from which we inferred the chemical complexation between KMnO and hydrochar.
在这项研究中，通过水热碳化，开发了一种从 KMnO 处理的竹废料中制备工程水炭的新方法。水炭产率在 180°C 时为 61.8-67.8%，在 260°C 时为 39.8-45.0%，分别在规定范围内。较高的温度导致 C 含量较高，H/C 和 O/C 比降低，而灰分含量随着 KMnO 浓度的增加而增加，导致固体产率增加，C 含量降低。准二级动力学模型最适合描述竹水炭的吸湿动力学，在 260°C 和 1.0wt%浓度下制备的工程水炭获得了更好的疏水性 0.82%。SEM-EDS 和 XRD 分析证实了工程水炭表面存在碳酸锰，由此我们推断出 KMnO 和水炭之间的化学络合。
