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A Novel Cellulose-Based Polymer for Efficient Removal of Methylene Blue

机译：一种新型的纤维素基聚合物可有效去除亚甲基蓝

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A novel cellulose-based cross-linked polymer, dicarboxymethyl cellulose (DCMC), has been synthesized and used for methylene blue (MB) removal. Inductively coupled plasma atomic emission spectrometry (ICP-AES), Fourier-transform infrared spectroscopy (FTIR), nitrogen porosimetry, and optical microscopy were employed to characterize the structure of the cellulose-based adsorbent. The number of carboxylate groups per gram of polymer (CG) was calculated with sodium content determined by ICP-AES. Systematic equilibrium and kinetic adsorption studies were performed to assess the polymer suitability for dye removal. The effect of pH on its adsorption capacity was also studied and the equilibrium adsorption data was analyzed using Langmuir, Freundlich, and Sips isotherms. At pH = 3, the adsorption isotherms followed the Langmuir model with a maximum adsorption capacity of 887.6 mg/g. At pH = 6.4, the adsorption isotherms produced S-shape curves and were best fitted with the Sips model. The maximum MB uptake increased to 1354.6 mg/g. Pseudo first-order and second-order models were used to fit the kinetic data. A pseudo second-order kinetic model provided the best correlation for the adsorption of MB onto DCMC. Adsorption coupled with membrane filtration achieved 95% methylene blue removal and DCMC can be successfully regenerated and reused in consecutive experiments.
机译：一种新型的基于纤维素的交联聚合物二羧甲基纤维素（DCMC）已被合成并用于亚甲基蓝（MB）的去除。电感耦合等离子体原子发射光谱法（ICP-AES），傅立叶变换红外光谱法（FTIR），氮孔隙率法和光学显微镜用于表征纤维素基吸附剂的结构。计算每克聚合物（CG）的羧酸根基团数，并通过ICP-AES测定钠含量。进行了系统的平衡和动力学吸附研究，以评估聚合物对染料去除的适用性。还研究了pH对其吸附容量的影响，并使用Langmuir，Freundlich和Sips等温线分析了平衡吸附数据。在pH = 3时，吸附等温线遵循Langmuir模型，最大吸附容量为887.6 mg / g。在pH = 6.4时，吸附等温线产生S形曲线，最适合Sips模型。 MB的最大摄入量增加到1354.6 mg / g。伪一阶和二阶模型用于拟合动力学数据。伪二级动力学模型为MB在DCMC上的吸附提供了最佳关联。吸附和膜过滤相结合可实现95％的亚甲基蓝去除，DCMC可成功再生并在后续实验中重复使用。

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