Black liquor (BL), being a residue of pulp and paper industries, composed of lignin, sulphides and carbonates of alkaline metals. BL valorisation into activated carbon is one of the possible solutions to manage waste from the mentioned industry sectors. A number of studies from the literature reported the preparation of activated carbon from lignin through metallic salt and hydroxide activation. Relying on the existing massive experimental data set, this paper proposes regression models that describe the variation of the textural properties of lignin-derived activated carbon as a function of operation conditions, such as temperature, activation time and impregnation ratio for different activators (KOH, NaOH). Statistical significance of model parameters was verified by relying on results of test. Using the proposed models, it was highlighted that activation temperature and impregnation ratio parameters are the principal factors controlling the activation process, while activation time has less significant effect on the development of porous structure. Carbons produced by lignin activation in the presence of KOH exhibit higher specific surface area (SSA) and micropore volume (MPV) than NaOH-activated carbons and require shorter activation time to reach high porosity. KOH activation of lignin-derived char requires lower activation temperature in comparison with a direct KOH-activation of lignin.

中文翻译：

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通过化学活化描述木质素纳米多孔碳特性的统计方法

黑液（BL）是制浆造纸工业的残留物，由木质素、硫化物和碱金属碳酸盐组成。 BL 增值为活性炭是管理上述工业部门废物的可能解决方案之一。许多文献研究报道了通过金属盐和氢氧化物活化从木质素制备活性炭。依托现有的大量实验数据集，本文提出了回归模型，描述了木质素活性炭的结构特性随操作条件（例如温度、活化时间和不同活化剂（KOH、氢氧化钠）。依靠检验结果验证了模型参数的统计显着性。使用所提出的模型，强调活化温度和浸渍比参数是控制活化过程的主要因素，而活化时间对多孔结构的发展影响较小。在 KOH 存在下通过木质素活化产生的碳比 NaOH 活性炭表现出更高的比表面积 (SSA) 和微孔体积 (MPV)，并且需要更短的活化时间才能达到高孔隙率。与木质素的直接 KOH 活化相比，木质素衍生炭的 KOH 活化需要较低的活化温度。