新型强碱阴离子交换树脂对电镀废水中Cr（Ⅵ）吸附性能研究

发布时间：2018-01-12 21:27

  本文关键词：新型强碱阴离子交换树脂对电镀废水中Cr（Ⅵ）吸附性能研究　出处：《内蒙古大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 大孔树脂 离子交换 N-甲基咪唑 Cr(Ⅵ)

【摘要】：含铬废水污染对生态系统及人类的健康都造成了严重的威胁,铬污染已经成为世界各国亟待解决的问题。离子交换技术被认为是移除水体中重金属较为简单有效的方法,许多分离过程借助离子交换技术得以实现。离子交换的核心—树脂,是一类依靠活性官能团与其他离子进行交换而达到吸附、分离、纯化目的的高分子化合物,在废水处理领域得到了广泛的应用。本文围绕大孔N-甲基咪唑强碱阴离子交换树脂资源化治理高浓度电镀含铬废水进行研究,主要工作内容如下:(1)考察了大孔N-甲基咪唑强碱阴离子交换树脂PCl对高浓度含铬溶液的静态和动态吸附性能。系统的研究了各种实验因素对其静态吸附性能的影响和不同运行参数对动态柱实验吸附的影响,并就吸附过程中发生的Cr(Ⅵ)还原现象及其影响因素进行了探究。结果表明,PCl树脂对Cr(Ⅵ)有很好的选择性,在pH范围1-14内对Cr(Ⅵ)吸附性能稳定,且对低酸度、高浓度的含铬溶液吸附能力较强,最大吸附容量可达187.7 mg/g。动态柱实验吸附流速选用5 mL/min,解吸选用浓度为2.5 mol/L,流速为4 mL/min的NaOH溶液处理效果最为理想,其吸附容量为59.7g/L,解吸比可达96%。吸附过程中Cr(Ⅲ)的产生,证明了树脂受到Cr(Ⅵ)的氧化,通过SEM、XPS、FT-IR分析进一步证明了这一结论,并推测其可能的氧化机理。静态实验发现Cr(Ⅵ)还原程度与Cr(Ⅵ)溶液的pH值和初始平衡浓度有关。(2)在以上研究基础上设计了一种双阴柱全饱和离子交换工艺,对镀铬漂洗水进行处理。以小柱实验参数为依据,结合实际废水处理要求合理推算出大柱运行参数,并进行实验验证。PCl树脂经过30次吸附—再生运行,其饱和吸附容量基本在60g/L左右。回收液的Cr(Ⅵ)浓度为140g/L左右,其中Cl-和SO42-的含量都达到了镀铬回用标准。
[Abstract]:The pollution of chromium-containing wastewater is a serious threat to ecosystem and human health. Chromium pollution has become an urgent problem in the world. Ion exchange technology is considered to be a simple and effective method to remove heavy metals in water. Many separation processes can be realized by ion exchange technology. The core of ion exchange resin is a kind of polymer compounds which can be adsorbed, separated and purified by the exchange of active functional groups with other ions. It has been widely used in wastewater treatment. In this paper, the treatment of chromium-containing wastewater with high concentration of chromium-containing wastewater by using macroporous N-methylimidazole strong base anion exchange resin was studied. The main contents of the work are as follows:. The static and dynamic adsorption properties of macroporous N-methylimidazole strong base anion exchange resin (PCl) for high concentration chromium-containing solution were investigated. The influence of various experimental factors on the static adsorption performance and its different operation were systematically studied. The influence of parameters on the experimental adsorption of dynamic column. The phenomenon of Cr (鈪，

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