Improved Solid-Phase Synthesis of Phosphorylated Cellulose Microsphere Adsorbents for Highly Effective Pb2+ Removal from Water: Batch and Fixed-Bed Column Performance and Adsorption Mechanism
Improved Solid-Phase Synthesis of Phosphorylated Cellulose Microsphere Adsorbents for Highly Effective Pb2+ Removal from Water: Batch and Fixed-Bed Column Performance and Adsorption Mechanism
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DOI：
10.1021/acssuschemeng.7b00472
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发表时间：
2017-06-01
影响因子：
8.4
通讯作者：
Wang, Fen
中科院分区：
文献类型：
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作者：
Luo, Xiaogang;Yuan, Jun;Wang, Fen
通过改进的固相改性方法设计了一种高效的纤维素微球结合磷酸基团的吸附剂，通过间歇固定床柱法吸附水中的铅离子。磷酸化纤维素微球吸附剂是通过酯化反应制备的，通过酯化反应将磷酸基团引入到再生纤维素微球的界面上，再生纤维素微球是通过简单的纤维素溶液的溶胶-凝胶转变过程制备的。通过SEM、FTIR、XRD和DSC等手段对其形态、结构和物理化学性质进行了表征。此外，还利用EDX和XPS证实了化学改性过程并研究了它们的磷酸盐吸附机制。在间歇吸附实验中，通过平衡和动力学吸附实验确定了平衡时间和吸附容量，并研究了吸附机理。在动态吸附实验中，评估了流量、初始浓度、床高和pH等多种操作条件，并将实验数据拟合到Adams-Bohart、Thomas、Yoon-Nelson、床深服务时间（BDST）和剂量响应等多种动态吸附模型中，以研究吸附剂对Pb2+的吸附性能。结果表明，化学吸附是吸附过程的主要控制过程，吸附剂可以通过螯合作用高效地捕获水中的Pb2+。
A highly effective adsorbent with phosphate groups bound to cellulose microspheres was designed by an improved solid-phase modification method to adsorb lead ions from water by a batch and fixed-bed column method. The phosphorylated cellulose microsphere adsorbents were prepared through esterification by which phosphate groups were introduced to the interface of regenerated cellulose microspheres which were previously prepared through a sol-gel transition process from a simple cellulose solution. Their morphological, structural, and physicochemical properties were characterized by SEM, FTIR, XRD, and DSC, etc. Furthermore, EDX and XPS were used to confirm the chemical modification process and to investigate their phosphate adsorption mechanism. In the batch adsorption experiments, the equilibrium time and adsorption capacity were determined by both equilibrium and kinetic adsorption experiments, which were also conducted to investigate the adsorption mechanism. In the dynamic adsorption experiments, multiple operation conditions such as flow rate, initial concentration, bed height, and pH were evaluated, and the experiment data were fitted to several dynamic adsorption models, such as Adams-Bohart, Thomas, Yoon-Nelson, Bed Depth Service Time (BDST), and Dose Response, to study the performance of adsorption of Pb2+ onto the adsorbents. The results suggested that chemical adsorption was the main controlled process during the adsorption process and that the adsorbents could highly effectively capture Pb2+ from water via chelation.