CN112588275A - 一种Chelex 100-四氧化三铁纳米磁珠的制备方法 - Google Patents

一种Chelex 100-四氧化三铁纳米磁珠的制备方法 Download PDF

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CN112588275A
CN112588275A CN202011625080.1A CN202011625080A CN112588275A CN 112588275 A CN112588275 A CN 112588275A CN 202011625080 A CN202011625080 A CN 202011625080A CN 112588275 A CN112588275 A CN 112588275A
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ferroferric oxide
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杨杭福
杨方宗
余云丹
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Abstract

本发明是一种Chelex 100‑四氧化三铁纳米磁珠的制备方法,包括以下步骤:(1)通过共沉淀法制备Fe3O4纳米磁珠;(2)纳米磁珠表面进行氨基修饰;(3)制备Chelex 100‑四氧化三铁纳米磁珠。本发明所述的一种Chelex 100‑四氧化三铁纳米磁珠的制备方法,该方法制备的纳米磁珠不仅具有高比表面积和强磁性,还具有Chelex 100树脂高专一性的金属离子吸附特性,能够快速高效除去废水中的重金属离子,并可多次重复利用,是一种优良的绿色环保型吸附剂。

Description

一种Chelex 100-四氧化三铁纳米磁珠的制备方法
技术领域
本发明属于纳米磁珠领域,具体涉及一种Chelex 100-四氧化三铁纳米磁珠的制备方法。
背景技术
磁性纳米材料是一种新型磁性材料,在现代社会中有着广泛的应用,它不仅具有纳米材料的优良特性,同时还具有超顺磁性,高磁化率等特性。Fe3O4纳米磁珠由于其稳定性高、制备简单、超顺磁性、表面易于修饰和生物相容性好等特点,成为目前应用最广泛的纳米磁性材料之一。
重金属因其特殊的化学、地球化学性质及毒性效应,被称为环境中具有潜在危害的重要污染物,具有高度危害性和难治理性。国内通常采用的重金属废水处理方法,包括石灰中合法和硫化法等。这些传统的处理工艺,虽然可以将废水中的重金属除掉,但是处理效果并不稳定,处理后回收的清水水质仍难以确保稳定达标排放,而且还会产生二次污染。吸附法也常被用于水体中重金属离子的净化,是利用吸附剂将废水中的重金属离子除去的方法,具有快速高效、成本低、无二次污染等优点,而吸附剂是吸附法去除重金属离子的关键材料,因此制备性能优异的吸附剂有利于提高重金属离子的净化效果。
Chelex 100是一种由苯乙烯、二乙烯苯共聚体组成的化学螯合树脂,由于Chelex100树脂具有羧基基团,因此将其归为弱阳离子交换介质,但与此类交换介质的不同之处在于,Chelex 100树脂具有高专一性的金属离子选择特性,以及异常高的键强度。Chelex 100树脂其对二价与一价离子的选择性大约为5000:1,即使在高浓度盐溶液中,它也对过渡金属具有很强的亲和力。同时,根据PH≥6.5时重金属吸附于树脂,PH<1.0时,重金属不吸附于树脂这一特性,Chelex-100树脂可以在废水中选择性的吸附重金属离子,再利用稀硝酸溶液将重金属离子从树脂上洗下,实现废水净化和吸附剂可再生利用,而磁性纳米材料具有易回收,表面易于修饰的特性,有利于Chelex-100树脂的重复利用与重金属污染物的集中处理。鉴于此,有必要提出一种Chelex 100-四氧化三铁纳米磁珠的制备。
发明内容
本发明的目的在于提供一种Chelex 100-四氧化三铁纳米磁珠的制备方法,该方法能显著改善纳米磁珠的分散性,同时还能保证较好的磁性。
为了实现上述目的,采用的技术方案是:
一种Chelex 100-四氧化三铁纳米磁珠的制备方法,包括以下步骤。
(一) 共沉淀法制备四氧化三铁纳米磁珠
将Fe2+的铁盐和Fe3+的铁盐溶解于水中,得到铁盐溶液;所述铁盐中Fe2+
和Fe3+的摩尔比为1:1.2~2.2;通入氮气,调整溶液温度至60~70℃,先超声震荡5~10min,后加入过量NaOH搅拌25~35min,外加磁场静置分层,得到四氧化三铁沉淀,相继用纯化水和无水乙醇洗涤2~3次,-20℃冷冻干燥48h,得到Fe3O4纳米磁珠。
(二) 纳米磁珠的表面修饰
取0.5g Fe3O4纳米磁珠加入到50mL无水乙醇中,超声震荡5~10min,
使磁珠分散均匀,然后加入3-氨基丙基三乙氧基硅烷(APTES)溶液,室温搅拌6~12h,磁分离后得到硅烷化Fe3O4纳米磁珠。相继用无水乙醇和PBS溶液洗涤2~3次,后用PBS溶液重悬,加入戊二醛,室温震荡交联2~3h,磁分离后弃上清,得到氨基化修饰的Fe3O4纳米磁珠。
(三) 制备Chelex 100-四氧化三铁纳米磁珠
将上述氨基化修饰的Fe3O4纳米磁珠加入到Chelex100溶液中,两者质
量比为1:1~5,室温下震荡固定2~3h,磁分离后,相继用纯化水和PBS溶液洗涤2~3次,最后用PBS溶液重悬,得到Chelex 100-四氧化三铁纳米磁珠。
进一步的,所述步骤(1)中Fe2+的铁盐为FeSO4*7H2O,Fe3+的铁盐为FeCl3*6H2O。
进一步的,所述步骤(2)中硅烷化试剂为APTES。
与现有技术相比,有益效果在于:
1. 本发明所述的一种Chelex 100-四氧化三铁纳米磁珠的制备方法,
该方法克服了纳米磁珠易氧化、易团聚的缺点,提高了其生物相容性;
2.一种Chelex 100-四氧化三铁纳米磁珠的制备方法,该方法对该微
球既能保留磁性粒子的优良特性,同时又可拥有Chelex 100树脂高专一性的金属离子选择特性,从而拓宽了纳米磁珠的应用范围。
附图说明
图1为不同吸附剂对铅离子的吸附率。
图2为Chelex 100-四氧化三铁纳米磁珠回收次数对铅离子吸附的影响。
具体实施方式
通过以下详细说明结合附图可以进一步理解本发明的特点和优点。所提供的实施例仅是对本发明方法的说明,而不以任何方式限制本发明揭示的其余内容。
实施例1 共沉淀法制备四氧化三铁纳米磁珠
将Fe2+的铁盐和Fe3+的铁盐溶解于水中,得到铁盐溶液;所述铁盐中Fe2+
和Fe3+的摩尔比为1:1.2~2.2;通入氮气,调整溶液温度至60~70℃,先超声震荡5~10min,后加入过量NaOH搅拌25~35min,外加磁场静置分层,得到四氧化三铁沉淀,相继用纯化水和无水乙醇洗涤2~3次,-20℃冷冻干燥48h,得到Fe3O4纳米磁珠。
实施例2 纳米磁珠的表面修饰
取0.5g Fe3O4纳米磁珠加入到50mL无水乙醇中,超声震荡5~10min,
使磁珠分散均匀,然后加入3-氨基丙基三乙氧基硅烷(APTES)溶液,室温搅拌6~12h,磁分离后得到硅烷化Fe3O4纳米磁珠。相继用无水乙醇和PBS溶液洗涤2~3次,后用PBS溶液重悬,加入戊二醛,室温震荡交联2~3h,磁分离后弃上清,得到氨基化修饰的Fe3O4纳米磁珠。
实施例3 制备Chelex 100-四氧化三铁纳米磁珠
将上述氨基化修饰的Fe3O4纳米磁珠加入到Chelex100溶液中,两者质
量比为1:1~5,室温下震荡固定2~3h,磁分离后,相继用纯化水和PBS溶液洗涤2~3次,最后用PBS溶液重悬,得到Chelex 100-四氧化三铁纳米磁珠。
应用例1 Chelex 100-四氧化三铁纳米磁珠吸附性能研究
分别称取0.25g Fe3O4纳米磁珠,Chelex 100和Chelex 100-四氧化三铁纳米磁珠加入到25 mL硝酸铅溶液(ρ0=5 mg/L)中,在不同时刻取悬浮液用0.25µm水性滤膜过滤得到澄清溶液,澄清溶液硝酸铅的质量浓度记作ρt。采用火焰原子吸收法测定不同时刻溶液中铅离子的质量浓度,则不同吸附剂对铅离子的吸附率ƒ=[(ρ0t)/ ρ0]×100%。从图1中可以看到制备的四氧化三铁对铅离子的吸附较慢,140 min才能达到90%以上;而Chelex 100和Chelex 100-四氧化三铁纳米磁珠对铅离子的吸附较快,20 min即达到吸附平衡,说明四氧化三铁纳米磁珠与Chelex 100偶联并不影响Chelex 100对重金属离子特异的吸附性能。
应用例2 Chelex 100-四氧化三铁纳米磁珠可重复性研究
Fe3O4纳米磁珠具有磁性,因此当Chelex 100-四氧化三铁纳米磁珠吸收完Pb2+后,可以通过加入外磁场对其进行回收,从而降低吸附剂的回收成本。回收的纳米磁珠用稀硝酸溶液将重金属离子从树脂上洗下,依次用质量浓度为1%氨水、无水乙醇及纯化水反复洗涤沉淀物数次至洗涤液为中性,上述操作记为回收一次,回收次数用N表示,用该回收的磁珠再次进行吸附性能研究,记录不同回收次数磁珠在不同时间对铅离子的吸附率。从图2中可以看出Chelex 100-四氧化三铁纳米磁珠回收10次也不影响其吸附性能。

Claims (7)

1.一种Chelex 100-四氧化三铁纳米磁珠的制备方法,其特征在于,包括以下步骤:
共沉淀法制备Fe3O4纳米磁珠
将Fe2+的铁盐和Fe3+的铁盐溶解于水中,得到铁盐溶液;所述铁盐中Fe2+和Fe3+的摩尔比为1:1.2~2.2;通入氮气,调整溶液温度至60~70℃,先超声震荡5~10min,后加入过量NaOH搅拌25~35min,外加磁场静置分层,得到四氧化三铁沉淀,相继用纯化水和无水乙醇洗涤2~3次,-20℃冷冻干燥48h,得到Fe3O4纳米磁珠。
2.纳米磁珠表面进行氨基修饰
取0.5g Fe3O4纳米磁珠加入到50mL无水乙醇中,超声震荡5~10min,
使磁珠分散均匀,然后加入3-氨基丙基三乙氧基硅烷(APTES)溶液,室温搅拌6~12h,磁分离后得到硅烷化Fe3O4纳米磁珠。
3.相继用无水乙醇和PBS溶液洗涤2~3次,后用PBS溶液重悬,加入戊二醛,室温震荡交联2~3h,磁分离后弃上清,得到氨基化修饰的Fe3O4纳米磁珠。
4.制备Chelex 100-四氧化三铁纳米磁珠
将上述氨基化修饰的Fe3O4纳米磁珠加入到Chelex100溶液中,两者
质量比为1:1~5,室温下震荡固定2~3h,磁分离后,相继用纯化水和PBS溶液洗涤2~3次,最后用PBS溶液重悬,得到Chelex 100-四氧化三铁纳米磁珠。
5.根据权利要求1所述的制备方法,其特征在于,其中,
所述步骤(1)中Fe2+的铁盐为FeSO4*7H2O,Fe3+的铁盐为FeCl3*6H2O。
6.根据权利要求1所述的制备方法,其特征在于,其中,
所述步骤(2)中硅烷化试剂为APTES。
7.根据权利要求1所述的制备方法,其特征在于,其中,
所述步骤(3)中Fe3O4纳米磁珠与Chelex100质量比为1:1~5。
CN202011625080.1A 2020-12-31 2020-12-31 一种Chelex 100-四氧化三铁纳米磁珠的制备方法 Withdrawn CN112588275A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113145180A (zh) * 2021-05-17 2021-07-23 暨南大学 一种磁性离子交换树脂马达的制备方法及其产品和应用

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113145180A (zh) * 2021-05-17 2021-07-23 暨南大学 一种磁性离子交换树脂马达的制备方法及其产品和应用

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