Ural Federal University, Mira St. 19, Yekaterinburg 620002, Russia; Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt.
Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt.
Int J Biol Macromol. 2019 Oct 15;139:153-160. doi: 10.1016/j.ijbiomac.2019.07.162. Epub 2019 Jul 26.
A new adsorbent, sulfated crosslinked chitosan (SGCH), has been synthesized for the effective extraction of beryllium ions from their aqueous solutions. In recent times, beryllium extraction has been of great importance because beryllium can be used in many applications such as in nuclear reactor, heat shields, high-technology ceramics, alloys and electronic heat sinks. SGCH has been synthesized by two successive phases. The first is the conversion of chitosan (CH) into non-soluble cross-linked chitosan (GCH) through the interaction between chitosan and glutaraldehyde. The second step is the formation of functional sulfonate groups onto the adsorbent material through the interaction of GCH with chlorosulfonic acid (sulfating agent). The role played by the sulfonate groups in the adsorption process was analyzed using FT-IR and SEM. Also, the role played by the solution pH, time, beryllium concentration and temperature on the batch adsorption process was investigated. Our results point to the successful preparation of SGCH adsorbent with high affinity for beryllium ions. The maximum sorption values of beryllium ions on the investigated biosorbent is 40.6 mg/g. The desorption of the loaded beryllium ions from the SGCH was achieved by using 1.5 M urea acidified by 0.6 M HSO.
一种新型吸附剂——硫酸化交联壳聚糖（SGCH）已被合成，用于从水溶液中有效提取铍离子。近年来，铍的提取变得非常重要，因为铍可用于许多应用，如核反应堆、热屏蔽、高科技陶瓷、合金和电子散热器。SGCH 通过两个连续的阶段合成。第一阶段是通过壳聚糖（CH）与戊二醛之间的相互作用，将壳聚糖转化为不溶性交联壳聚糖（GCH）。第二阶段是通过 GCH 与氯磺酸（磺化剂）的相互作用，在吸附剂材料上形成功能磺酸基。使用傅里叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）分析了磺酸基在吸附过程中的作用。还研究了溶液 pH 值、时间、铍浓度和温度对批处理吸附过程的影响。我们的结果表明成功制备了对铍离子具有高亲和力的 SGCH 吸附剂。在所研究的生物吸附剂上，铍离子的最大吸附值为 40.6mg/g。通过使用 1.5M 脲酸化 0.6M HSO，实现了从 SGCH 上负载的铍离子的解吸。
