Laboratory of Green Chemistry, Department of Energy and Environmental Technology, Faculty of Technology, Lappeenranta University of Technology, Mikkeli, Finland.
J Colloid Interface Sci. 2011 Jun 1;358(1):261-7. doi: 10.1016/j.jcis.2011.02.059.
Novel adsorbents were synthesized by functionalizing chitosan-silica hybrid materials with (ethylenediaminetetraacetic acid) EDTA ligands. The synthesized adsorbents were found to combine the advantages of both silica gel (high surface area, porosity, rigid structure) and chitosan (surface functionality). The Adsorption potential of hybrid materials was investigated using Co(II), Ni(II), Cd(II), and Pb(II) as target metals by varying experimental conditions such as pH, contact time, and initial metal concentration. The kinetic results revealed that the pore diffusion process played a key role in adsorption kinetics, which might be attributed to the porous structure of synthesized adsorbents. The obtained maximum adsorption capacities of the hybrid materials for the metal ions ranged from 0.25 to 0.63 mmol/g under the studied experimental conditions. The adsorbent with the highest chitosan content showed the best adsorption efficiency. Bi-Langmuir and Sips isotherm model fitting to experimental data suggested the surface heterogeneity of the prepared adsorbents. In multimetal solutions, the hybrid adsorbents showed the highest affinity toward Pb(II).
通过将（乙二胺四乙酸）EDTA 配体功能化壳聚糖-二氧化硅杂化材料，合成了新型吸附剂。研究发现，所合成的吸附剂结合了硅胶（高表面积、孔隙率、刚性结构）和壳聚糖（表面功能）的优点。通过改变实验条件，如 pH 值、接触时间和初始金属浓度，使用 Co(II)、Ni(II)、Cd(II)和 Pb(II) 作为目标金属来研究杂化材料的吸附潜力。动力学结果表明，孔扩散过程在吸附动力学中起着关键作用，这可能归因于合成吸附剂的多孔结构。在研究的实验条件下，杂化材料对金属离子的最大吸附容量范围为 0.25 至 0.63mmol/g。具有最高壳聚糖含量的吸附剂表现出最佳的吸附效率。双朗缪尔和 Sips 等温模型拟合实验数据表明，所制备的吸附剂具有表面不均匀性。在多金属溶液中，杂化吸附剂对 Pb(II) 表现出最高的亲和力。
