Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
Jining Mingsheng New Materials Co., Ltd., Xinglong Industrial Park, Yanzhou District, Jining, Shandong 272101, China.
Carbohydr Polym. 2019 Jun 1;213:296-303. doi: 10.1016/j.carbpol.2019.02.029. Epub 2019 Feb 19.
Pre-hydrolysis liquor (PHL) from the kraft-based dissolving pulp process contains large amounts of hemicelluloses, which is usually treated as an effluent and further efforts have to be involved to eliminate the pollution disposal. However, the hemicelluloses-rich PHL is a promising candidate for the production of carbon microspheres via hydrothermal carbonization. The yield of the carbon microspheres directly derived from the hydrothermal carbonization of the hemicelluloses-rich PHL (22.1%) was almost twice than that from xylose (13.1%). Furthermore, sulfuric acid and the lignin in the PHL could significantly improve the yield and change the size of the carbon microspheres obtained from the PHL. Additionally, the activated carbon microspheres functionalized with acrylic acid showed improved adsorption capacities for Pb(II) ion (273.4 mg/g) and methylene blue (701.3 mg/g). The hydrothermal carbonization of the PHL not only utilizes the hemicelluloses in the PHL, but also reduces the pollution load of the PHL significantly.
碱法溶解浆制浆过程中的预水解液（PHL）中含有大量的半纤维素，通常被视为废水，需要进一步处理以消除污染。然而，富含半纤维素的 PHL 是通过水热碳化法生产碳微球的有前途的候选物。直接由富含半纤维素的 PHL 水热碳化得到的碳微球的产率（22.1%）几乎是木糖（13.1%）的两倍。此外，PHL 中的硫酸和木质素可以显著提高碳微球的产率，并改变其尺寸。此外，用丙烯酸功能化的活性炭微球对 Pb(II)离子（273.4mg/g）和亚甲基蓝（701.3mg/g）的吸附能力也得到了提高。PHL 的水热碳化不仅利用了 PHL 中的半纤维素，而且还显著降低了 PHL 的污染负荷。
