Activated carbon from potassium hydroxide spent liquor lignin using phosphoric acid

作者：Sarkar Mamon; Tian Chao; Jahan M. Sarwar

来源：Tappi Journal, 2018, 17(2): 63-69.

Activated carbon was prepared by phosphoric acid (H3PO4) activation of potassium hydroxide (KOH) pulping spent liquor lignin from rice straw and compared with KOH hydroxide activation. The process parameters, such as impregnation ratio, activation temperature, and activation time were varied and their effects on the yield of activated carbon and iodine number were studied. The activated carbon prepared by H3PO4 at 800 degrees C for 60 min at an impregnation ratio of 2.5 reached a Brunauer-Emmett-Teller (BET) surface area of 1063 m(2)/g, including pore diameter of 14.4 nm, iodine number of 525 mg/g, and yield of 49.2%. Yield and BET surface area in KOH activation was much lower than that of H3PO4.
Application: Potassium hydroxide spent liquor lignin can be used in producing activated carbon. In the biorefinery, this can be integrated with pulp production based on agricultural wastes.

• 出版日期2018-2
• 单位中国制浆造纸研究院