高吸附容量壳聚糖的改性及其对亚甲基蓝的去除。
Modification of chitin with high adsorption capacity for methylene blue removal.
机构信息
Pingdingshan University, 467000 Pingdingshan, China.
Pingdingshan University, 467000 Pingdingshan, China.
出版信息
Int J Biol Macromol. 2018 Jul 15;114:392-399. doi: 10.1016/j.ijbiomac.2018.03.138. Epub 2018 Mar 23.
Porous chitin sorbents (PChs) with different content of chitin, ranging from 0.9% to 3.5%, were prepared by gel method with CaBr·xHO/CHOH solution and characterized by FT-IR, XRD and SEM. The adsorption isotherms and kinetic analysis of methylene blue (MB) onto PChs were studied. Experimental results illustrated lower crystallinity and more pores of PChs containing 3.5% chitin displayed higher adsorption capacity, the removal of MB was 79.8%. The adsorption equilibrium isotherm curve of MB onto PChs adsorbents conformed to the Freundlich equation. The PFO, PSO and Weber-Morris models were applied to fit with the adsorption kinetics. The results demonstrated the adsorption of MB might be the mass transfer of heterogeneous system and involve multiple diffusion steps. The adsorption capacity of PChs with 3.5% chitin can maintain 65% removal ratio of MB after being used six adsorption-desorption cycles. It was supposed that PChs may be a promising, cheap, environmentally friendly and efficient adsorbent for some dye wastewater treatment in the near future.
不同含壳聚糖量（0.9%至 3.5%）的多孔壳聚糖（PChs）通过 CaBr·xH2O/CH3OH 溶液的凝胶法制备，并通过 FT-IR、XRD 和 SEM 进行了表征。研究了亚甲基蓝（MB）在 PChs 上的吸附等温线和动力学分析。实验结果表明，含 3.5%壳聚糖的 PChs 具有较低的结晶度和更多的孔隙，显示出更高的吸附能力，对 MB 的去除率为 79.8%。MB 在 PChs 吸附剂上的吸附平衡等温线曲线符合 Freundlich 方程。PFO、PSO 和 Weber-Morris 模型被用于拟合吸附动力学。结果表明，MB 的吸附可能是多相体系的质量传递，并涉及多个扩散步骤。含 3.5%壳聚糖的 PChs 在经历六次吸附-解吸循环后，对 MB 的去除率仍能保持 65%。因此，PChs 可能是一种有前途的、廉价的、环保的、高效的吸附剂，可用于处理一些染料废水。
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