Removal of methyl orange from aqueous solutions by adsorption on cellulose hydrogel assisted with Fe₂O₃ nanoparticles

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• 作者：Hao Zhang ; Qian Luan ; Hu Tang ; Fenghong Huang ; Mingming Zheng ; Qianchun Deng…
• 关键词：Cellulose ; Magnetic hydrogel ; Adsorption ; Methyl orange
• 刊名：Cellulose
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：24
• 期：2
• 页码：903-914
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Bioorganic Chemistry; Physical Chemistry; Organic Chemistry; Polymer Sciences;
• 出版者：Springer Netherlands
• ISSN：1572-882X
• 卷排序：24

文摘

Cellulose hydrogel, fabricated from cellulose solution in an LiOH/urea aqueous system at low temperature, was successfully applied for in situ synthesis of Fe₂O₃ nanoparticles to obtain hybrid magnetic nanomaterials. The microporous structure of cellulose hydrogel at wet state provided reaction chambers to synthesize the Fe₂O₃ nanoparticles. The structure and properties of the magnetic cellulose/Fe₂O₃ hydrogels were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, magnetic detection, thermal analysis, etc. The results revealed that the magnetic cellulose/Fe₂O₃ hydrogels exhibited efficient adsorption of methyl orange in the aqueous solution as a result of the microporous structure, large surface area, and affinity for organic dyes. The equilibrium process was described well by the Langmuir isotherm model, showing a monolayer adsorption. From kinetic experiments, the adsorption process followed the pseudo-second-order kinetic model, indicating that the overall rate of dye uptake could be controlled by external mass transfer at the beginning of adsorption, while intra-particle diffusion controlled the overall rate of adsorption at a later stage. This work provided an attractive adsorbent for removing hazardous materials from wastewater.