Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (4): 23-29.doi: 10.3969/j.issn.1000-565X.2010.04.005

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Effects of Deinking Mode on Pore Structure and Crystallization Property of Recycled Fiber

Guo Wen-jie  Wang Yan  Wan Jin-quan  Ma Yong-wen   

  1. School of Environmental Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2009-07-01 Revised:2009-09-26 Online:2010-04-25 Published:2010-04-25
  • Contact: 郭文杰（1968-），男，博士后，主要从事制浆造纸及其污染控制的研究． E-mail:kwauk001@163．com
  • About author:郭文杰（1968-），男，博士后，主要从事制浆造纸及其污染控制的研究．
  • Supported by:

    国家“863”计划项目（2007AA03Z433）; 广东省重点科技攻关项目（2008A0302008）; 广东省科技计划项目（2008B030302035）; 广东省节能减排重大专项（2008A080800003）; 华南理工大学自然科学青年基金资助项目

PDF

925

Abstract:

X-ray diffraction and low-temperature nitrogen adsorption were adopted to investigate the pore structure and crystallization property of the fibers of old newspaper pulp（ONP） and deinking pulp with different deinking modes,and the fractal geometry was used to further analyze the pore structure of the fibers.The results indicate that（1） the BET specific surface area,BJH pore volume and BJH average pore size of the deinking fibers remain almost unchanged after a neutral,alkaline or enzymatic deinking process;（2） the fractal dimensions of the fibers before and after the deinking process are similar,which means that deinking modes have little effect on the pore structure of the fibers;（3） the crystallinity of the fibers decreases to 12.24%,6.12% or 0.77% after a neutral,alkaline or enzymatic deinking process,respectively;（4） the water retention value（WRV） increases after deinking,in an order of alkali deinkingneutral deinkingenzymatic deinking;and（5） after deinking,the beating degree and average length of the fibers slightly decrease while the content of fine fibers increases.

Key words: deinking, crystallinity, pore structure, fractal, recycled fiber