Department of Materials Science and Metallurgical Engineering, Complutense University of Madrid, Ciudad Universitaria, 28040 Madrid, Spain.
J Hazard Mater. 2010 Jun 15;178(1-3):243-8. doi: 10.1016/j.jhazmat.2010.01.069. Epub 2010 Jan 18.
This work reports the effectiveness of sugar-beet pectin xerogels for the removal of heavy metals (cadmium, lead and copper) after multiple batch sorption-desorption cycles, with and without a gels regeneration step. Metals were recovered from xerogel beads without destroying their sorption capability and the beads were successfully reused (nine cycles) without significant loss in both biosorption capacity and biosorbent mass. Metals uptake levelled off or increased after using a 1M CaCl(2) regeneration step after each desorption. Calcium, as a regenerating agent, increased the stability and reusability of the gels repairing the damage caused by the acid and removing the excess protons after each elution providing new binding sites. Because of their excellent reusability, pectin xerogels are suitable for metal remediation technologies.
本工作报道了甜菜果胶干凝胶在多次批量吸附-解吸循环后去除重金属（镉、铅和铜）的有效性，其中包括和不包括凝胶再生步骤。从干凝胶珠中回收金属而不破坏其吸附能力，并且珠粒成功地重复使用（九次循环），在生物吸附容量和生物吸附剂质量方面没有明显损失。在用 1M CaCl(2)再生步骤对每次洗脱后进行再生后，金属的吸收达到平衡或增加。钙作为一种再生剂，增加了凝胶的稳定性和可重复使用性，修复了酸引起的损伤，并在每次洗脱后去除多余的质子，提供了新的结合位点。由于其优异的可重复使用性，果胶干凝胶适用于金属修复技术。
