Ball milling technology was employed to increase the adsorption capacity of biochar with respect to methylene blue as a model pollutant. Comparative studies on the adsorption ability were conducted on ball-milled biochar and biochar chemically modified by oxidation and alkaline treatment, showing that ball milling produces higher performances since increases available active sites. The particle size reduction, with the consequence of an increase in the surface area was hypothesized to be responsible for the high removal efficiency. The adsorption kinetics follow a pseudo-second-order model, implying that the process is affected by chemisorption. Moreover, the Langmuir model proved that the maximum monolayer adsorption capacity increased to 185.18 mg/g. Design of experiments allowed for evaluating the pH and initial concentration values, which maximized the removal efficiency. The milled biochar was also regenerated and reused over six times, resulting in a drop of only 1 %.

中文翻译：

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改性生物炭的染料吸附效率：化学改性与球磨辅助处理的比较


采用球磨技术来提高生物炭对作为模型污染物的亚甲基蓝的吸附能力。对球磨生物炭和经过氧化和碱处理化学改性的生物炭进行了吸附能力的比较研究，表明球磨生物炭由于增加了可用的活性位点而具有更高的性能。据推测，颗粒尺寸的减小以及表面积的增加是高去除效率的原因。吸附动力学遵循伪二阶模型，这意味着该过程受到化学吸附的影响。此外，Langmuir模型证明最大单层吸附容量增加至185.18 mg/g。实验设计允许评估 pH 值和初始浓度值，从而最大限度地提高去除效率。研磨后的生物炭也被再生并重复使用了六次以上，结果仅下降了 1%。