Abstract
Pre-hydrolysis liquor (PHL) is a waste water from the production process of kraft-based dissolving pulp, which mainly contains saccharides and lignin. In the present work, a sustainable process to produce porous carbon using PHL as raw material and potassium hydroxide as an activator is proposed. The characteristics of the porous carbon produced and its adsorption efficiency on methylene blue (MB) were discussed.The results showed that the properties of PHL porous carbon (PPC) were primarily influenced by the carbonization temperature and the mass ratio of KOH/PHL. At the optimal conditions of a carbonization temperature of 900 ℃ and a mass ratio of 1:1 (KOH/PHL), the specific surface area, the pore volume, and the average pore diameter of PPC is 3.8 nm, 0.5 cm3·g−1 and 1319 m2·g−1, respectively. Additionally, the adsorption capacity of PPC for methylene blue (MB) at 45 ℃ reached to 680.23 mg·g−1, which indicates that PHL can be used as a raw material to produce porous carbon for efficient removal of MB. This research contributes to the development of converting waste into valuable resources.
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