A Novel and Effective Recyclable BiOCl/BiOBr Photocatalysis for Lignin Removal from Pre-Hydrolysis Liquor
Shengyu Zhang,
Jiachuan Chen,
Qianqian Jia,
Qimeng Jiang,
Jiaqiang Yan,
Guihua Yang
Affiliations
Shengyu Zhang
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
Jiachuan Chen
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
Qianqian Jia
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
Qimeng Jiang
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
Jiaqiang Yan
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
Guihua Yang
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
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 CO2. After 15 h of illumination, 49.9 μmol CO and 553.0 μmol CO2 were produced by BiOCl, and 38.7 μmol CO and 484.3 μmol CO2 were produced by BiOBr. Therefore, both BiOCl and BiOBr exhibit excellent adsorption and photocatalytic properties for lignin removal from pre-hydrolysis.
