大学化学 >> 2017, Vol. 32 >> Issue (9): 46-51.doi: 10.3866/PKU.DXHX201703029

化学实验 上一篇    下一篇

两种氢氧化铁胶体纯化新方法

关瀚昌,段昌林,沈腊珍,曾麟翔*()   

  • 发布日期:2017-09-12
  • 通讯作者: 曾麟翔 E-mail:yyac_625@163.com
  • 基金资助:
    国家自然科学基金(51303098);国家自然科学基金(21477069);山西省教育厅高科技项目(2013140);山西大同大学校级科研项目(2014Q11)

Two Novel Methods on Iron Hydroxide Colloid Purification

Han-Chang GUAN,Chang-Lin DUAN,La-Zhen SHEN,Lin-Xiang ZENG*()   

  • Published:2017-09-12
  • Contact: Lin-Xiang ZENG E-mail:yyac_625@163.com
  • Supported by:
    国家自然科学基金(51303098);国家自然科学基金(21477069);山西省教育厅高科技项目(2013140);山西大同大学校级科研项目(2014Q11)

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摘要：

针对在Fe（OH）3胶体纯化过程中，难以在短时间内获得一定纯度的Fe（OH）3胶体的问题，探究了两种Fe（OH）3胶体纯化的新方法，冷热交替渗析法和混合离子交换树脂法，并且对两种方法的最佳纯化条件及其各自的优劣进行探索。实验结果表明：使用冷热交替渗析法，60℃热水浴渗析35 min后冷水浴渗析15 min，胶体的电导率可达560 μS·cm-1；而混合离子交换树脂法，当阴阳离子交换树脂的总质量为10 g，且质量比为1：1，粗胶体的体积为45 mL时，胶体的电导率可降至42 μS·cm-1。两种方法各有优劣，在教学实践过程中可根据实际情况灵活选择。

关键词: 胶体, 渗析, 离子交换树脂, 电导率

Abstract:

In order to solve time-consuming problems during purification of coarse Fe(OH)3 colloid, two novel methods were proposed, that is, hot-cold alternating dialysis and mixed ion exchange resin. We investigated the optimum purification condition of the two methods. In addition, advantages and disadvantages were discussed in details. The results indicated that colloid conductivity could decrease to 560 μS·cm-1 when dealing with colloid in 60℃ hot water for 35 min and subsequently in cold water for 15 min. While using mixed anion and cation ion exchange resin, colloid conductivity could go down to 42 μS·cm-1 when the mass ratio of the anion and cation ion exchange resin is 1:1 (total amount of resin is 10 g) and when the colloid volume is 45 mL. Due to the fact that either method has their strengths as well as weaknesses, we select feasible one depending on specific teaching circumstances.

Key words: Colloid, Dialysis, Ion-exchange resin, Conductivity