大学化学 >> 2020, Vol. 35 >> Issue (4): 72-80.doi: 10.3866/PKU.DXHX201911042

所属专题: 全国大学生化学实验创新设计竞赛

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新创实验:废旧棉中纤维素的提取改性及水凝胶的制备

林小云1,*(), 郭瑛1,*(), 高君宇2, 霍梦琦1, 罗广桢1   

  1. 1 南昌大学化学学院, 南昌 330031
    2 南昌大学高等研究院, 南昌 330031
  • 收稿日期:2019-11-22 录用日期:2019-03-03 发布日期:2020-03-11
  • 通讯作者: 林小云,郭瑛 E-mail:linxiaoyun@ncu.edu.cn;guoying@ncu.edu.cn
  • 基金资助:
    江西省高等学校教学改革研究省级课题(JXJG-17-1-30);南昌大学教学改革研究课题(NCUJGLX-17-92)

Extraction and Modification of Cellulose and Preparation of Hydrogel from Waste Cotton

Xiaoyun Lin1,*(), Ying Guo1,*(), Junyu Gao2, Mengqi Huo1, Guangzhen Luo1   

  1. 1 College of Chemistry, Nanchang University, Nanchang 330031, P. R. China
    2 Institute for Advanced Study, Nanchang University, Nanchang 330031, P. R. China
  • Received:2019-11-22 Accepted:2019-03-03 Published:2020-03-11
  • Contact: Xiaoyun Lin,Ying Guo E-mail:linxiaoyun@ncu.edu.cn;guoying@ncu.edu.cn

摘要:

水凝胶作为一种有着广阔应用前景的高分子材料,是当今科学研究的热门领域,其制备方法相对简单,还将有机合成化学、高分子化学、无机配位化学和分析化学结合于一体,显示出进一步改编为教学实验的潜力。水凝胶自身环境友好的特点还十分贴合绿色化学的主题,便于在教学实验设计中引入相关内容。虽然绿色化学教育在当今的化学专业人才培养中的重要性与日俱增,但在实际推广中也遇到了一些困难,比如定性描述较多,概念模糊不清,很难激发学生兴趣;定量计算过于简单,只关注反应前后质量变化等。针对绿色化学的教学困境,我们在将水凝胶这一科研成果转化为教学实验外,还引入了最新的绿色化学半定量评价方法,引导学生在实验准备阶段运用新颖的半定量评价方法找寻绿色程度较高的水凝胶合成路线。最终以废旧棉为原料提取改性得到羧甲基纤维素钠,再以滴定法测定其取代度,然后采取金属离子交联方法制备出可视化水凝胶产品,并对其吸附性能进行了初步测试。

关键词: 半定量绿色评价方法, 废旧棉, 羧甲基纤维素钠, 金属离子交联, 水凝胶

Abstract:

Hydrogel, as a kind of polymer material with broad application prospects, is a hot field of scientific research at present. Synthesis of hydrogel is relatively simple, and it combines organic synthesis chemistry, polymer chemistry, inorganic coordination chemistry and analytical chemistry, showing the potential to be adapted to laboratory teaching. Hydrogel is environmentally friendly and fits the theme of green chemistry, which facilitates the introduction of relevant content in the design of laboratory teaching projects. Although green chemistry education plays an increasingly important role in the cultivation of chemical professionals, it has encountered some obstacles in the practical promotion, such as quantitative descriptions, ambiguous concepts and difficulty in stimulating students' interest. Meanwhile, present quantitative calculation of green chemistry only focuses on the mass change before and after reaction. In response to the teaching dilemma of green chemistry as well as translation of advanced scientific achievements, the latest semi-quantitative evaluation method of green chemistry have also been, together with synthesis of hydrogel, introduced to guide students to find the hydrogels synthesis route with high green degree at the stage of experimental preparation. Finally, sodium carboxymethyl cellulose was extracted and modified from waste cotton, and its degree of substitution was determined by titration. Then, metal ion crosslinking method was used to prepare the colored hydrogel product, and its adsorption performance was tested.

Key words: Semi-quantitative green evaluation method, Waste cotton, Sodium carboxymethyl cellulose, Metal ion crosslinking, Hydrogels

MSC2000: 

  • G64