High-value utilization of bamboo pulp black liquor lignin: Preparation of silicon-carbide derived materials and its
Yidan Zhong1, Tao Wang1, Ming Yan1
1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry and Food, Nanjing Forestry University, Nanjing 210037, China.
Abstract:
The black liquor of bamboo pulp contains a large amount of silicon, which makes it difficult to separate industrial lignin, thus hindering its high-value utilization. Herein, this paper dedicates to exploring the high-value use of silica-containing lignin. Tetraethyl silicate (TEOS) was added to the above silicon-containing lignin for crosslinking with the lignin to prevent disintegration during carbonization and provide an additional source of silica. The carbonization is carried out at 600 °C (LT-6), 900 °C (LT-9) and 1200 °C (LT-12), and the structural evolution of SiOxCy is innovatively analyzed. The results show that LT-9 is dominated by the SiO3C structure and has a specific surface area of 269 m2 g-1. The specific capacitance of LT-9 and LT-12 as supercapacitors electrodes is 78.6 F g-1 and 74.8 F g-1 at a current density of 1 A g-1, and remains 95 % and 91.7 % after 10,000 cycles. Moreover, LT-9 has a high yield of 54 %. In this work, silicon-containing lignin is exploratively prepared as a silicon-carbide-derived material. Furthermore, the potential relationship between different SiOxCy molecular structures and electrochemical performance is evaluated, which is instructive for the high-value utilization of black liquor in bamboo pulp.
