Saber-Samandari Samaneh, Saber-Samandari Saeed, Nezafati Nader, Yahya Kovan
Department of Chemistry, Eastern Mediterranean University, Gazimagusa, TRNC via Mersin 10, Turkey.
New Technologies Research Center, Amirkabir University of Technology, Tehran, Iran.
J Environ Manage. 2014 Dec 15;146:481-490. doi: 10.1016/j.jenvman.2014.08.010. Epub 2014 Sep 8.
Chitosan is a well-known sorbent and effective in the uptake of anionic or reactive dyes, but it has deficiency in adsorption of basic dyes. In this work, chitosan/Fe-substituted hydroxyapatite composite beads were prepared in a different ratio via embedding of hydroxyapatite into chitosan solution for removal of basic dye and heavy metal from aqueous solution. The composite beads were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy in order to reveal their composition and surface morphology. In this particular study, methylene blue (MB) and lead (Pb (II)) ions were selected as representatives of dye and a heavy metal, respectively. The various experimental conditions affecting dye adsorption were explored to achieve maximum adsorption capacity. Moreover, the kinetic, thermodynamic and adsorption isotherm models were employed for the description of the heavy metal and dye adsorption processes. The results indicated that the prepared hydrogel is an efficient adsorbent for the aforementioned dye and metal concomitant with the ability of regeneration without losing the original activity and stability for water treatment applications.
壳聚糖是一种著名的吸附剂，对阴离子或活性染料的吸附效果良好，但在吸附碱性染料方面存在不足。在本研究中，通过将羟基磷灰石嵌入壳聚糖溶液中，以不同比例制备了壳聚糖/铁取代羟基磷灰石复合珠，用于从水溶液中去除碱性染料和重金属。通过傅里叶变换红外光谱和扫描电子显微镜对复合珠进行表征，以揭示其组成和表面形态。在本具体研究中，分别选择亚甲基蓝（MB）和铅（Pb（II））离子作为染料和重金属的代表。探索了影响染料吸附的各种实验条件，以实现最大吸附容量。此外，采用动力学、热力学和吸附等温线模型来描述重金属和染料的吸附过程。结果表明，所制备的水凝胶是一种高效的吸附剂，可用于上述染料和金属的吸附，同时具有再生能力，在水处理应用中不会丧失其原始活性和稳定性。
