Activated charcoal was prepared from pine tree sawdust by chemical activation by means of phosphoric acid (PSDP) that was used for Humic acid bio sorption from aqueous medium. The influence of humic acid initial concentration, sorbent mass, and solution temperature on sorption process was investigated. Langmuir and Freundlich isotherm models were used to analyze the equilibrium sorption data. The maximum adsorption capacities of PSDP obtained from Langmuir were 170.9, 182.1 and 209.6 mg/g at 25°C, 45°C and 65°C, respectively. Humic acid adsorption onto PSDP was spontaneous, favorable at higher temperature and endothermic in nature. Activated charcoal from pine tree sawdust proves to have high capacity adsorptive to natural organic compound (humic acid).

中文翻译：

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松木屑基活性炭吸附水溶液中腐殖酸的等温热力学研究

活性炭是由松木锯末通过磷酸（PSDP）进行化学活化而制备的，磷酸用于从水介质中吸附腐殖酸。研究了腐殖酸的初始浓度，吸附剂质量和溶液温度对吸附过程的影响。用Langmuir和Freundlich等温线模型分析平衡吸附数据。由Langmuir获得的PSDP的最大吸附容量在25℃，45℃和65℃下分别为170.9、182.1和209.6mg / g。腐殖酸是自发吸附在PSDP上的，在较高的温度下具有良好的吸热性，并且自然吸热。松木锯末中的活性炭被证明具有对天然有机化合物（腐殖酸）的高吸附能力。