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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
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-05-10 00:00:00 , DOI: 10.1021/acssuschemeng.7b00472 Xiaogang Luo 1 , Jun Yuan 1 , Yingge Liu 1 , Chao Liu 1 , Xingrong Zhu 1 , Xuehai Dai 1 , Zhaocheng Ma 2 , Fen Wang 1, 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-05-10 00:00:00 , DOI: 10.1021/acssuschemeng.7b00472 Xiaogang Luo 1 , Jun Yuan 1 , Yingge Liu 1 , Chao Liu 1 , Xingrong Zhu 1 , Xuehai Dai 1 , Zhaocheng Ma 2 , Fen Wang 1, 3
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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.
中文翻译：
高效固相合成磷酸化纤维素微球吸附剂以高效去除水中的Pb 2+：分批和固定床色谱柱的性能和吸附机理
通过改进的固相改性方法，设计了一种高效的吸附剂，该吸附剂具有与纤维素微球键合的磷酸基团，该吸附剂通过分批和固定床柱法从水中吸附铅离子。磷酸化的纤维素微球吸附剂是通过酯化反应制备的，通过将磷酸基团引入再生的纤维素微球的界面，再生的纤维素微球以前是通过溶胶-凝胶转变过程从简单的纤维素溶液中制备的。用SEM，FTIR，XRD和DSC等对它们的形貌，结构和理化性质进行了表征。此外，用EDX和XPS证实了其化学改性过程并研究了其对磷酸盐的吸附机理。在分批吸附实验中，通过平衡和动力学吸附实验确定了平衡时间和吸附容量，并研究了其吸附机理。在动态吸附实验中，评估了多种操作条件，例如流速，初始浓度，床高和pH值，并将实验数据拟合到了几种动态吸附模型，例如Adams–Bohart，Thomas，Yoon–Nelson，Bed深度服务时间（BDST）和剂量响应，以研究Pb的吸附性能2+吸附到吸附剂上。结果表明，化学吸附是吸附过程中的主要控制过程，吸附剂可以有效地通过螯合作用从水中捕获Pb 2+。
更新日期：2017-05-31
中文翻译：
高效固相合成磷酸化纤维素微球吸附剂以高效去除水中的Pb 2+：分批和固定床色谱柱的性能和吸附机理
通过改进的固相改性方法，设计了一种高效的吸附剂，该吸附剂具有与纤维素微球键合的磷酸基团，该吸附剂通过分批和固定床柱法从水中吸附铅离子。磷酸化的纤维素微球吸附剂是通过酯化反应制备的，通过将磷酸基团引入再生的纤维素微球的界面，再生的纤维素微球以前是通过溶胶-凝胶转变过程从简单的纤维素溶液中制备的。用SEM，FTIR，XRD和DSC等对它们的形貌，结构和理化性质进行了表征。此外，用EDX和XPS证实了其化学改性过程并研究了其对磷酸盐的吸附机理。在分批吸附实验中，通过平衡和动力学吸附实验确定了平衡时间和吸附容量，并研究了其吸附机理。在动态吸附实验中，评估了多种操作条件，例如流速，初始浓度，床高和pH值，并将实验数据拟合到了几种动态吸附模型，例如Adams–Bohart，Thomas，Yoon–Nelson，Bed深度服务时间（BDST）和剂量响应，以研究Pb的吸附性能2+吸附到吸附剂上。结果表明，化学吸附是吸附过程中的主要控制过程，吸附剂可以有效地通过螯合作用从水中捕获Pb 2+。
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