大学化学 >> 2024, Vol. 39 >> Issue (5): 274-286.doi: 10.3866/PKU.DXHX202311067

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具有资源循环利用和开放探究特色的新型胶体电泳实验

陈珊莹, 霍康宁, 綦可, 李晶怡, 李淑欣, 李运超   

  1. 北京师范大学化学学院, 北京 100875
  • 收稿日期:2023-11-20 修回日期:2024-01-03 发布日期:2024-03-11
  • 通讯作者: 李运超 E-mail:liyc@bnu.edu.cn
  • 基金资助:
    教育部虚拟教研室建设试点项目(师范院校物理化学课程虚拟教研室)；北京师范大学校级教改项目(jx2022057)

A Novel Colloid Electrophoresis Experiment with the Characteristics of Resource Recycling and Inquiry-Driven Experimental Design

Shanying Chen, Kangning Huo, Ke Qi, Jingyi Li, Shuxin Li, Yunchao Li   

  1. College of Chemistry, Beijing Normal University, Beijing 100875, China
  • Received:2023-11-20 Revised:2024-01-03 Published:2024-03-11
  • Contact: Yunchao Li E-mail:liyc@bnu.edu.cn

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摘要： 鉴于传统Fe(OH)3胶体电泳实验存在胶体浪费、渗析耗时、缺乏探究性等局限，故做如下改进：1) 以Fe(OH)3废液为原料，利用胶溶法将其再生，实现循环利用；2) 改进渗析工艺，提高胶体纯化效率；3) 引入AgI胶体探究环节，增强创新性与趣味性；4) 引入纸片电泳，科教融合，培养学以致用的意识。经反复验证，上述方案行之有效，并已在本校推广，教学反响热烈。

关键词: Fe(OH)3胶体, ζ电势测定, 循环利用, 胶溶法, AgI胶体带电性质判断

Abstract: As a classical physical chemistry experiment, traditional Fe(OH)3 colloid electrophoresis has suffered from the following shortcomings, such as the waste of Fe(OH)3 colloid, the long dialysis operation time, and the lack of inquiry learning. To overcome such shortcomings, we have made the following improvements on the original experiment: 1) realizing the recycling of Fe(OH)3 colloid by regenerating Fe(OH)3 colloid waste via colloid redissolution route; 2) improving the purification efficiency of coarse Fe(OH)3 colloid through optimizing the dialysis procedure; 3) introducing AgI colloid exploratory investigation to enhance the innovation and interestingness of this experiment; 4) introducing paper electrophoresis to cultivate the ability to connect fundamental experiments with practical applications. The above improvements have been fully confirmed and already applied in the colloid electrophoresis experiment performed in our university. As expected, such improvements have aroused enthusiastic responses from the students attended this course, thus providing a valuable reference for us to improve other classical experiments.

Key words: Fe(OH)3 colloid, Zeta potential determination, Resource recycling, Colloid redissolution method, Silver iodide colloid surface charge analysis