文章摘要
高吸附量纤维素膜的制备及其对Pb2+的吸附性能
Preparation of cellulose membrane with high adsorption capacity and its adsorption performance for Pb2
投稿时间:2019-05-17  修订日期:2019-08-31
DOI:
中文关键词: 纤维素膜  凝固浴  吸附  Pb2
英文关键词: cellulose membrane  coagulation bath  adsorption  Pb2
基金项目:内蒙古自然科学基金(2016MS0210)
作者单位E-mail
贺娇娇 内蒙古农业大学 材料科学与艺术设计学院 961607327@qq.com 
杨兴林 内蒙古农业大学 材料科学与艺术设计学院  
刘萌 内蒙古农业大学 材料科学与艺术设计学院  
王丽 内蒙古农业大学 材料科学与艺术设计学院  
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中文摘要:
      采用相转化法(L-S法),以纤维素为原料,氢氧化钠、尿素、硫脲为溶剂体系制备纤维素膜,研究凝固浴的种类、H2SO4体积百分比、凝固温度和凝固时间对纤维素膜吸附Pb2 的吸附量影响;运用扫描电镜(SEM)、傅立叶红外光谱仪(FTIR)和X射线衍射仪(XRD)对纤维素膜的微观结构进行表征;采用热失重分析仪(TG)对纤维素膜的热性能进行分析。结果表明:以H2SO4为凝固浴,H2SO4体积百分比为7 %,凝固温度为40 ℃,凝固时间为120 min时,纤维素膜对铅离子的吸附量达到最大,为343.0 mg/g。纤维素膜由堆积紧密的片层结构变为三维网状结构,并且生成了C=O键和N—H键。纤维素膜中部分纤维素结晶型由Ⅰ型转变为Ⅱ型,结晶度降低;和纤维素相比,纤维素膜的热稳定性有一定程度的提高。
英文摘要:
      Cellulose membrane was prepared by phase conversion method (L-S method) with cellulose as raw material, sodium hydroxide, urea and thiourea as solvent system, the effects of coagulation bath type, H2SO4 volume percentage, solidification temperature and solidification time on the adsorption capabilities of cellulose membrane for Pb2 were studied; the microstructure of the cellulose membrane was characterized by SEM, FTIR and XRD; the thermal properties of cellulose membrane was analyzed by thermogravimetric analyzer (TG). The results show that coagulation bath is H2SO4, the volume percentage of H2SO4 is 7 %, the solidification temperature is 40 ℃, and the solidification time is 120 min, the adsorption capacity of cellulose membrane to lead ions reach the maximum, which is 343.0 mg/g. The structure of cellulose membrane changes from a closely packed sheet to a three-dimensional network structure, and C=O bond and N—H bond generates in cellulose membrane. Crystal form of part cellulose in the cellulose membrane changes from type I to type II, and the crystallinity decreases; compared with cellulose, the thermal stability of cellulose membrane is improves to some extent.
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