Department of Chemistry, University of Cyprus, P.O. Box 20537, Cy-1678 Nicosia, Cyprus.
Department of Chemistry, University of Cyprus, P.O. Box 20537, Cy-1678 Nicosia, Cyprus.
Bioresour Technol. 2014 May;159:460-4. doi: 10.1016/j.biortech.2014.03.073. Epub 2014 Mar 25.
The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial metal concentration, ionic strength, temperature and contact time). Activation of the biochar took place using nitric acid oxidation and characterisation was performed by SEM analysis, FTIR spectroscopy, N2 adsorption and acid-base titrations. The results show that laminar structures constitute the material and carboxylic moieties are the predominant binding sites. The experimental data were analyzed by the Langmuir, Freundlich and Dubinin-Radushkevich adsorption models and the monolayer adsorption capacity was found to be 3.5 mol kg(-1). The effect of ionic strength and temperature on the adsorption efficiency indicates that at low pH outer-sphere and at near neutral pH inner-sphere complexes are the predominant surface species and the kinetic data obtained were fitted very well by the Lagergren rate expression.
仙人掌纤维制备的活性生物炭对水溶液中 Cu(II)去除的吸附效率作为各种物理化学参数（例如 pH 值、初始金属浓度、离子强度、温度和接触时间）的函数进行了研究。生物炭的活化采用硝酸氧化法，通过 SEM 分析、FTIR 光谱、N2 吸附和酸碱滴定进行了表征。结果表明，层状结构构成了该材料，羧酸基团是主要的结合位点。实验数据通过 Langmuir、Freundlich 和 Dubinin-Radushkevich 吸附模型进行了分析，发现单层吸附容量为 3.5 mol kg(-1)。离子强度和温度对吸附效率的影响表明，在低 pH 值时，外球和近中性 pH 值时，内球配合物是主要的表面物种，获得的动力学数据非常符合 Lagergren 速率表达式。
