使用基于纳米纤维素和聚乙烯亚胺的微凝胶从水溶液中吸附去除阴离子染料。
Adsorptive removal of anionic dyes from aqueous solutions using microgel based on nanocellulose and polyvinylamine.
机构信息
School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan 250353, China.
Key Laboratory of Paper Science & Technology of Ministry of Education, Qilu University of Technology, Jinan 250353, China.
出版信息
Bioresour Technol. 2015 Dec;197:348-55. doi: 10.1016/j.biortech.2015.08.093. Epub 2015 Aug 31.
A novel nanocomposite microgel based on nanocellulose and amphoteric polyvinylamine (PVAm) was fabricated via a two-step method. Firstly, cellulose nanocrystal was oxidized by sodium periodate to yield dialdehyde nanocellulose (DANC). DANC was then used as a crosslinker to react with PVAm to obtain a pH responsive microgel with high density of free amine groups. The microgel was characterized using FTIR, XRD, AFM and elemental analysis. AFM images revealed that the nanocomposite was microspherical particles with a diameter ranging from 200 to 300nm. The microgel was found to be effective in anionic dye removal at acidic conditions. The adsorption isotherms for congo red 4BS, acid red GR and reactive light yellow K-4G fit well with the Sips model, and the maximum adsorption capacities were 869.1mgg(-1), 1469.7mgg(-1) and 1250.9mgg(-1), respectively. The adsorption for these three anionic dyes all followed pseudo second order kinetics, indicating a chemisorption nature.
一种新型纳米复合微凝胶由纳米纤维素和两性聚烯丙基胺（PVAm）通过两步法制备。首先，用过氧化氢钠将纤维素纳米晶氧化生成二醛纳米纤维素（DANC）。然后，DANC 被用作交联剂与 PVAm 反应，得到一种具有高密度游离胺基的 pH 响应微凝胶。使用傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、原子力显微镜（AFM）和元素分析对微凝胶进行了表征。AFM 图像表明，纳米复合材料为微球形颗粒，直径范围为 200-300nm。发现该微凝胶在酸性条件下对阴离子染料的去除效果显著。刚果红 4BS、酸性红 GR 和活性亮黄 K-4G 的吸附等温线很好地符合 Sips 模型，最大吸附容量分别为 869.1、1469.7 和 1250.9mg/g。这三种阴离子染料的吸附均遵循拟二级动力学，表明其为化学吸附。
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