CN108514867A - 一种检测甲醛的海藻酸钠凝胶球的制备 - Google Patents

一种检测甲醛的海藻酸钠凝胶球的制备 Download PDF

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CN108514867A
CN108514867A CN201810350583.9A CN201810350583A CN108514867A CN 108514867 A CN108514867 A CN 108514867A CN 201810350583 A CN201810350583 A CN 201810350583A CN 108514867 A CN108514867 A CN 108514867A
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吕珊珊
陈春雨
韩光
黄燕
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Suzhou Link Environmental Protection Technology Co Ltd
Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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Abstract

一种检测甲醛的新型海藻酸钠凝胶球的制备，涉及甲醛检测技术领域。采用非极性凝胶性凝胶浴中液滴‑悬浮凝胶法制备具有甲醛检测功能的海藻酸钠凝胶球，包括下列步骤:首先称取酚试剂和硫酸铁铵在搅拌的条件下完全溶解于盐酸溶液中，利用此混合溶液作为前驱体溶液；配制海藻酸钠凝胶滴入到含有酚试剂和硫酸铁铵的盐酸溶液中在搅拌的条件下形成凝胶球。通过调控前驱体溶液和海藻酸钠溶液的浓度、比例、转速和反应时间来控制凝胶球的制备，该发明可以用于甲醛的检测。

Description

一种检测甲醛的海藻酸钠凝胶球的制备
技术领域
本发明涉及甲醛检测技术领域，具体为一种甲醛检测的海藻酸钠凝胶球的新型制备方法。
背景技术
水溶性的海藻酸钠和多价阳离子(镁除外)反应后在大分子间形成交联键。当多价阳离子的含量增加时，海藻酸钠溶液变得越来越黏稠，最后形成凝胶并产生沉淀物。本发明利用的就是海藻酸钠和金属铁离子迅速发生离子交换生成凝胶球，再利用凝胶球对甲醛进行检测。
甲醛通常为无色有刺激性气味的气体，对人眼、鼻有刺激作用，易溶于水和乙醇，在化学工业、木材工业、纺织工业、防腐溶液等方面有大量的用途。但当甲醛的浓度含量过高时，会对人产生一定的危害，例如急性病毒支气管炎、呼吸困难、肺水肿；慢性病毒长期吸入低浓度的甲醛对人有一定的致癌性；还能引起哺乳动物细胞核的基因突变。市面上已经有很多对于空气中的甲醛检测的仪器、试纸等，但是这些检测方法存在条件复杂、需要的环境条件严格、影响因素多等不足。而且甲醛极易溶于水且在溶液中存在较稳定，所以对于溶液中甲醛的检测也势在必行。
本发明设计了一种新型的检测甲醛的凝胶球，此凝胶球较传统市面上现有的检测甲醛的方法相比，制备方法简单、方便携带、操作简单快捷，不仅对于空气中的甲醛具有检测功能还能灵敏的检测出溶液中的甲醛，为市面提供了一种新型的检测甲醛的凝胶球。
发明内容
本发明目的是提供一种新型的检测甲醛的凝胶球及其制备方法，制备得到的凝胶球既可以检测空气中的甲醛也可以检测溶液中的甲醛。
本发明制备检测甲醛的凝胶球的主要技术方案为：
一种新型的检测甲醛的凝胶球的制备方法，其特征在于，包括如下步骤：
(1)分别称取酚试剂和硫酸铁铵在搅拌的条件下完全溶于盐酸溶液中，室温下超声溶解得到前驱体溶液；
(2)称取海藻酸钠完全溶解于去离子水中，室温下搅拌使其均匀的分散在水溶液中，得到均匀的稳定的海藻酸钠凝胶溶液；
(3)将步骤(2)所得海藻酸钠凝胶溶液在搅拌的条件下滴入到步骤(1)前驱体溶液中，形成凝胶球；
(4)将凝胶球置于室温陈化一段时间，使凝胶球变得更加坚固即可。
在步骤(1)中所说的酚试剂与硫酸铁铵的质量比优选为0.01:1；
在步骤(1)中所说的得到前驱体的搅拌条件是转速为600-1000转/分钟。
在步骤(1)中优选盐酸浓度为0.1mol/l，每2g硫酸铁铵对应200ml盐酸。
在步骤(2)中所说的海藻酸钠水溶液的体积百分数优选为2％。
在步骤(2)中所说的海藻酸钠的搅拌时间为0.5h-2h。
在1步骤(3)中所说的海藻酸钠的滴加速率为2ml/min-5ml/min，速率可调。
在步骤(3)中所说的制备的凝胶球可以通过控制液体的流速控制尺寸大小。
在步骤(3)中海藻酸钠与硫酸铁铵的质量比为1:2。
在步骤(4)中所说的陈化时间为10min-30min。
一种新型的检测甲醛的凝胶球，其特征在于，根据上述任一所述方法制备得到。
一种新型的检测甲醛的凝胶球的应用，用于空气中和溶液中甲醛的检测使用。尤其可以用于缝隙中，将凝胶球卡在缝隙中。
本发明提供一种简单可行检测甲醛的凝胶球的新型制备方法。
本发明的优点在于：制备凝胶球的工艺简单可控；凝胶球对于甲醛灵敏度较好；凝胶球性能稳定；凝胶球体积较小方便携带。
附图说明
图1为制备的溶液和吸附的甲醛的溶液的颜色变化示意图。
图2为发明制备的凝胶球以及在溶液中凝胶球吸附了甲醛的颜色变化示意图。
图3为本发明制备的凝胶球在空气中吸附了甲醛的颜色变化示意图。
具体实施方式
结合附图对本发明的进行一个详细的说明，但本发明并不限于以下实施例。
实施例1
一种新型的检测甲醛的凝胶球的制备方法，包括如下步骤：
(1)分别称取20mg酚试剂和2g硫酸铁铵在搅拌的条件下完全溶于200ml浓度为0.1mol/l的稀盐酸中，室温下超声溶解得到前驱体溶液。
(2)称取1g海藻酸钠完全溶解于50ml去离子水中，室温下搅拌0.5-2h使其均匀的分散在水溶液中，得到均匀的稳定的体积分数为2％的海藻酸钠凝胶溶液。
(3)将海藻酸钠凝胶溶液在搅拌的条件下滴入前驱体溶液中，形成凝胶球。
(4)将凝胶球置于室温陈化一段时间，使凝胶球变得更加坚固。
如图1所示制备的酚试剂和硫酸铁铵的盐酸溶液，将甲醛滴入到此溶液中，溶液反应由原先的黄色变成蓝绿色，说明此溶液具有检测甲醛的功能。
如图2所示最左边的图片是将海藻酸钠的凝胶溶液滴加到氯化钙溶液中成功制备出了白色的凝胶球，说明海藻酸钠可以和金属阳离子制备凝胶球；中间的图片是将海藻酸钠的凝胶溶液滴加到酚试剂和硫酸铁铵的盐酸溶液中，制备出了黄色的凝胶球；最右边的图片是向溶液中的凝胶球滴加甲醛，溶液和凝胶球都由原来的黄色变成了蓝绿色，说明此溶液中的凝胶球对溶液中的甲醛有较好的检测作用。
如图3所示将制备的凝胶球放到一个甲醛气体的环境下，中间为未吸附甲醛的凝胶球颜色为黄色，右边为在空气中吸附了甲醛的凝胶球颜色变成了蓝绿色，说明本发明制备的凝胶球具有检测空气中甲醛的功能。

Claims (9)

1.一种检测甲醛的凝胶球的制备方法，其特征在于，包括如下步骤：
(1)分别称取酚试剂和硫酸铁铵在搅拌的条件下完全溶于盐酸溶液中，室温下超声溶解得到前驱体溶液；
(2)称取海藻酸钠完全溶解于去离子水中，室温下搅拌使其均匀的分散在水溶液中，得到均匀的稳定的海藻酸钠凝胶溶液；
(3)将步骤(2)所得海藻酸钠凝胶溶液在搅拌的条件下滴入到步骤(1)前驱体溶液中，形成凝胶球；
(4)将凝胶球置于室温陈化一段时间，使凝胶球变得更加坚固即可。
2.按照权利要求1所述的一种检测甲醛的凝胶球的制备方法，其特征在于，在步骤(1)中所说的酚试剂与硫酸铁铵的质量比为0.01:1；在步骤(1)中盐酸浓度为0.1mol/l，盐酸浓度为0.1mol/l，每2g硫酸铁铵对应200ml盐酸。
3.按照权利要求1所述的一种检测甲醛的凝胶球的制备方法，其特征在于，在步骤(2)中所说的海藻酸钠水溶液的体积百分数优选为2％。
4.按照权利要求1所述的一种检测甲醛的凝胶球的制备方法，其特征在于，在步骤(3)中所说的海藻酸钠的滴加速率为2ml/min-5ml/min，速率可调，通过控制液体的流速控制尺寸大小。
5.按照权利要求1所述的一种检测甲醛的凝胶球的制备方法，其特征在于，在步骤(3)中海藻酸钠与硫酸铁铵的质量比为1:2。
6.按照权利要求1所述的一种检测甲醛的凝胶球的制备方法，其特征在于，在步骤(4)中所说的陈化时间为10min-30min。
7.按照权利要求1-6任一项所述的方法制备得到的凝胶球。
8.按照权利要求1-6任一项所述的方法制备得到的凝胶球的应用，用于空气中和溶液中甲醛的检测使用。
9.按照权利要求8的应用，用于缝隙中，将凝胶球卡在缝隙中。
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