一种用于从预水解液中去除木质素的新型高效可回收BiOCl/BiOBr光催化方法。
A Novel and Effective Recyclable BiOCl/BiOBr Photocatalysis for Lignin Removal from Pre-Hydrolysis Liquor.
作者信息
Zhang Shengyu, Chen Jiachuan, Jia Qianqian, Jiang Qimeng, Yan Jiaqiang, Yang Guihua
机构信息
State Key Laboratory of Bio-Based Material and Green Papermaking/Key Laboratory of Pulp & Paper Science and Technology of Education Ministry of China, Qilu University of Technology, Jinan 250353, China.
出版信息
Nanomaterials (Basel). 2021 Oct 25;11(11):2836. doi: 10.3390/nano11112836.
The presence of lignin hampers the utilization of hemicelluloses in the pre-hydrolysis liquor (PHL) from the kraft-based dissolving pulp production process. In this paper, a novel process for removing lignin from PHL was proposed by effectively recycling catalysts of BiOCl/BiOBr. During the whole process, BiOCl and BiOBr were not only adsorbents for removing lignin, but also photocatalysts for degrading lignin. The results showed that BiOCl and BiOBr treatments caused 36.3% and 33.9% lignin removal, respectively, at the optimized conditions, and the losses of hemicellulose-derived saccharides (HDS) were both 0.1%. The catalysts could be regenerated by simple photocatalytic treatment and obtain considerable CO and CO. After 15 h of illumination, 49.9 μmol CO and 553.0 μmol CO were produced by BiOCl, and 38.7 μmol CO and 484.3 μmol CO were produced by BiOBr. Therefore, both BiOCl and BiOBr exhibit excellent adsorption and photocatalytic properties for lignin removal from pre-hydrolysis.
木质素的存在阻碍了牛皮纸基溶解浆生产过程中预水解液（PHL）中半纤维素的利用。本文提出了一种通过有效回收BiOCl/BiOBr催化剂从PHL中去除木质素的新工艺。在整个过程中，BiOCl和BiOBr不仅是去除木质素的吸附剂，也是降解木质素的光催化剂。结果表明，在优化条件下，BiOCl和BiOBr处理分别使木质素去除率达到36.3%和33.9%，半纤维素衍生糖类（HDS）的损失均为0.1%。催化剂可通过简单的光催化处理再生，并获得可观的CO和CO。光照15小时后，BiOCl产生49.9 μmol CO和553.0 μmol CO，BiOBr产生38.7 μmol CO和484.3 μmol CO。因此，BiOCl和BiOBr在从预水解中去除木质素方面均表现出优异的吸附和光催化性能。
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