Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Xiongchu Ave., Wuhan 430073, Hubei, China.
Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Xiongchu Ave., Wuhan 430073, Hubei, China.
Carbohydr Polym. 2016 Oct 20;151:640-648. doi: 10.1016/j.carbpol.2016.06.003. Epub 2016 Jun 2.
Many efforts have been driven to decontaminate the drinking water, and the development of efficient adsorbents with the advantages of cost-effectiveness and operating convenience for the removal of Pb(2+) from water is a major challenge. This work was aimed to explore the possibility of using cellulose-based adsorbents for efficient adsorption of Pb(2+). The millimeter-scale magnetic cellulose-based nanocomposite beads were fabricated via an optimal extrusion dropping technology by blending cellulose with the carboxyl-functionalized magnetite nanoparticles and acid-activated bentonite in NaOH/urea aqueous solution, and then they had been tested to evaluate the effectiveness in the removal of Pb(2+) from water. The effects of contact time, initial heavy metal ion concentrations, adsorption isotherms and solution pH on the sorption behavior were studied. The thermodynamic parameters (ΔG, ΔH and ΔS) indicated that the adsorption processes were feasible, spontaneous, endothermic and mainly controlled by chemical mechanisms. The reusability of the adsorbent was also studied.
人们已经做出了许多努力来净化饮用水，开发具有成本效益和操作方便优点的高效吸附剂，用于去除水中的 Pb(2+)，这是一个主要的挑战。本工作旨在探索使用基于纤维素的吸附剂来高效吸附 Pb(2+)的可能性。通过在 NaOH/尿素水溶液中混合纤维素与羧基功能化的磁铁矿纳米粒子和酸化膨润土，采用最佳的挤出滴注技术制备毫米级的磁性纤维素基纳米复合珠，然后对其进行测试以评估从水中去除 Pb(2+)的效果。研究了接触时间、初始重金属离子浓度、吸附等温线和溶液 pH 对吸附行为的影响。热力学参数 (ΔG、ΔH 和 ΔS) 表明吸附过程是可行的、自发的、吸热的，主要受化学机制控制。还研究了吸附剂的可重复使用性。
