Structural properties and adsorption capacity of holocellulose aerogels synthesized from an alkali hydroxide-urea solution

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• 作者：Gu-Joong Kwon (1)
  Dae-Young Kim (1)
  Jae-Hyun Hwang (2)
  Joo-Hyon Kang (3)
  
• 关键词：61.66.Hq ; 61.82.Pv ; Holocellulose ; Aerogels ; Nano ; materials ; Alkali hydroxide ; urea solution
• 刊名：Journal of the Korean Physical Society
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：64
• 期：10
• 页码：1470-1473
• 全文大小：
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• 作者单位：Gu-Joong Kwon (1)
  Dae-Young Kim (1)
  Jae-Hyun Hwang (2)
  Joo-Hyon Kang (3)
  
  1. Department of Biological & Environmental Science, Dongguk University, Seoul, 100-715, Korea
  2. Department of Food Industrial Management, Dongguk University, Seoul, 100-715, Korea
  3. Department of Civil and Environmental Engineering, Dongguk University, Seoul, 100-715, Korea
  
• ISSN：1976-8524

文摘

A tulip tree was used to synthesize a holocellulose aerogel from an aqueous alkali hydroxide-urea solution with the substitution of an organic solvent followed by freeze-drying. For comparison, the synthesized holocellulose aerogels were divided into two groups according to the source of the hydrogel, an upper suspended layer and a bottom concentrated layer of the centrifuged solution of cellulose and NaOH/urea solvents. We investigated the effects of the temperature of the pre-cooled NaOH/urea solution (i.e., dissolution temperature) on the pore structure and the adsorption capacity of the holocellulose aerogel. A nano-fibrillar network structure of the holocellulose aerogel was observed, with little morphological difference in pore structure for different dissolution temperatures. Both micropores and mesopores were observed in the holocellulose aerogel. The specific surface area of the holocellulose aerogel was generally greater at lower dissolution temperatures. In a series of adsorption tests using methylene blue, the holocellulose aerogel showed the greatest adsorption capacity at the lowest dissolution temperature tested (?°C). However, the dissolution temperature generally had little effect on the adsorption capacity. The holocellulose aerogel produced from the upper suspended layer of the centrifuged hydrogel solution showed a greater porosity and adsorption capacity than the one produced from the bottom concentrated layer. Overall, the aerogel made by utilizing a delignified tulip tree display a high surface area and a high adsorption property, indicating its possible application in eco-friendly adsorption materials.