CN116120569A - 一种锌基MOFs材料的制备方法及其吸附水中重金属的应用 - Google Patents
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- 239000013094 zinc-based metal-organic framework Substances 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 35
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- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- JTTIOYHBNXDJOD-UHFFFAOYSA-N 2,4,6-triaminopyrimidine Chemical compound NC1=CC(N)=NC(N)=N1 JTTIOYHBNXDJOD-UHFFFAOYSA-N 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 4
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
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- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 claims description 2
- 239000004246 zinc acetate Substances 0.000 claims description 2
- 239000011592 zinc chloride Substances 0.000 claims description 2
- 235000005074 zinc chloride Nutrition 0.000 claims description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 2
- 229960001763 zinc sulfate Drugs 0.000 claims description 2
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 2
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- 239000002904 solvent Substances 0.000 abstract description 6
- 231100000331 toxic Toxicity 0.000 abstract description 5
- 230000002588 toxic effect Effects 0.000 abstract description 5
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- 125000000524 functional group Chemical group 0.000 description 2
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- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 2
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- 239000012621 metal-organic framework Substances 0.000 description 2
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 description 1
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- 125000003277 amino group Chemical group 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种锌基MOFs材料的制备方法及其吸附水中重金属的应用。本发明的锌基MOFs材料是将锌盐、有机配体溶解于水中制备而成,具有比表面积大和活性位点多等优点,可快速吸附去除水中重金属,具有高的吸附容量,对于Cu(II)、Hg(II)和Pb(II)的吸附容量可达到4000mg/g以上。此外,本发明所提供的制备方法简单,制备过程溶剂为水降低了有毒有害的有机溶剂的使用,可快速高效吸附去除水中重金属,在重金属污染治理方面具有广阔的应用前景。
Description
技术领域
本发明公开了一种锌基MOFs材料的制备方法及其吸附水中重金属的应用,属于水处理材料制备的技术领域。
背景技术
近年来,重金属污染愈发严重,已然成为一个全球性的问题。重金属难以被生物降解,却可以通过食物链在生物体内富集,最终进入人体,危害人体健康。因此,去除重金属对于保障人类生命健康具有重要意义。
目前,常见的去除重金属的方法有化学沉淀、离子交换、电化学反应和吸附等,其中吸附是最为经济、有效的方法之一。金属有机骨架(MOFs)因具有孔隙率高、比表面积大、易于调控和修饰等特点,而成为具有巨大去除重金属潜力的吸附剂之一。
其中,ZIFs-8由作为金属源的Zn与作为有机配体的2-甲基咪唑在甲醇或N,N-二甲基甲酰胺(DMF)中反应生成的,因热稳定性高、化学耐受性优异,且对水中的重金属离子如(铅、汞)具有良好的吸附性能,而受到越来越多的关注。但是,ZIFs-8仍然存在一些缺点:(1)所用溶剂是有机溶剂,使用过量或有毒有机溶剂对环境存在潜在污染;(2)吸附性能有待提高。因此,本发明选择易溶于水等绿色溶剂的、含有更多与重金属结合的官能团(如氨基)的软氮供体作为配体,并使用水等绿色溶剂替代有毒有机溶剂制备锌基MOFs材料,用于吸附去除水中重金属。这种锌基MOFs材料可快速高效吸附去除水中重金属,在水处理领域和环境保护领域都具有重大意义。
发明内容
本发明的目的在于提供一种可快速高效吸附去除水中重金属的锌基MOFs材料,该锌基MOFs材料制备方法简单,制备过程溶剂为水降低了有毒有害的有机溶剂的使用,可快速高效吸附去除水中重金属。
为实现上述目的,本发明采取以下技术方案:
一种锌基MOFs材料的制备方法,包括如下步骤:
(1)将有机配体溶解在水中,得到有机配体水溶液;
(2)将可溶性锌盐溶解在水中,得到含有锌离子的可溶性盐水溶液;
(3)将步骤(2)所述含有锌离子的可溶性盐水溶液与步骤(1)得到的有机配体水溶液混合,室温搅拌一定时间,反应结束后,将产物离心、过滤,干燥,得到所述的锌基MOFs材料。
进一步地,上述技术方案,所述步骤(1)中,有机配体为2,4,6-三氨基嘧啶。
进一步地,上述技术方案,所述步骤(2)中,可溶性锌盐为硝酸锌、醋酸锌、硫酸锌、氯化锌中的一种或多种。
进一步地,上述技术方案,所述可溶性锌盐和有机配体的摩尔比为1:1~6。
进一步地,上述技术方案,所述步骤(3)中,可溶性锌盐水溶液和有机配体水溶液搅拌时间为30min~24h。
将本发明制得的锌基MOFs材料用于去除水中重金属Cu(II)、Hg(II)或Pb(II)的用途。
本发明的优点在于:
(1)使用水等绿色溶剂替代有毒有机溶剂制备了锌基MOFs材料,制备方法简单,降低了有机溶剂的污染;
(2)所制备的锌基MOFs材料,采用2,4,6-三氨基嘧啶作为有机配体,引入了大量的含氮官能团,增加了活性吸附位点,提高了对于重金属的吸附性能。
附图说明
图1为本发明实施例1制备的锌基MOFs材料的傅里叶红外光谱图;
图2为本发明实施例1制备的锌基MOFs材料的场发射扫描电镜图;
图3为本发明实施例1制备的锌基MOFs材料在不同吸附时间对(a)Cu(II)、(b)Hg(II)和(c)Pb(II)吸附容量的变化关系图;
图4为本发明实施例1制备的锌基MOFs材料在不同(a)Cu(II)、(b)Hg(II)和(c)Pb(II)平衡浓度对重金属吸附容量的变化关系图。
具体实施方式
为更好地理解本发明,以下结合具体实施例对本发明作进一步说明。
实施例1:
一种锌基MOFs材料的制备方法,步骤如下:
(1)将4mmol的2,4,6-三氨基嘧啶作为有机配体溶解在水中,得到有机配体水溶液;
(2)将1mmol的可溶性锌盐溶解在水中,得到含有锌离子的可溶性盐水溶液;
(3)将步骤(2)所述含有锌离子的可溶性盐水溶液与步骤(1)得到的有机配体水溶液混合,室温搅拌30min~24h,反应结束后,将产物离心、过滤,干燥,得到所述的锌基MOFs材料。
图1为本发明实施例1制备的锌基MOFs材料的傅里叶红外光谱图,根据图1可以发现,对于2,4,6-三氨基嘧啶,位于3447cm-1的宽吸收带归因于-NH2的伸缩振动,1584cm-1的峰对应于C=N的伸缩振动;对于锌基MOFs,除了具有3447cm-1处的-NH2特征峰和1584cm-1处的C=N特征峰,还具有位于420cm-1的Zn-N特征峰,说明成功合成了锌基MOFs。
图2为本发明实施例1制备的锌基MOFs材料的场发射扫描电镜图,从图2可以看到,所制备的锌基MOFs呈现纳米花状,可暴露更多的活性吸附位点,提高吸附性能。
本应用实例是有关实施例1制得的锌基MOFs材料作为吸附剂在不同吸附时间对重金属吸附效果的研究。
配制100mg/L的重金属离子溶液,加入吸附剂使得吸附剂含量为1mg/mL,然后在25℃下振荡,每隔一段时间,取出水溶液,收集水溶液,使用ICP-MS测定,计算得到一定时间下的吸附容量Qt,具体结果如图3所示:随着吸附时间的延长,Cu(II)、Hg(II)和Pb(II)的吸附容量在短时间内急剧增加,并最终放慢逐渐达到平衡;对于Hg(II)和Pb(II),5min即可达到吸附平衡;对于Cu(II),20min达到吸附平衡。
本应用实例是有关实施例1制得的锌基MOFs材料作为吸附剂在不同重金属初始浓度对重金属吸附效果的研究。
配制不同初始浓度(1~10000mg/L)的重金属离子溶液,将20mg吸附剂加入到20mL的样品溶液中,然后在25℃下振荡一定时间,收集水溶液,使用ICP-MS测定,计算平衡吸附容量Qe。采用Langmuir模型(方程为)、Freundlich模型(方程为)对吸附剂吸附去除重金属的吸附等温线进行解析,其中,Qe和Qm分别是平衡吸附量和最大吸附量,Ce是吸附平衡浓度,bL(L/mg)和KF(L/g)分别是与吸附强度有关的Langmuir和Freundlich常数,nF是与吸附容量相关的Freundlich常数。具体拟合如图4所示:由于Langmuir模型的相关系数比Freundlich模型更高,Langmuir模型比Freundlich模型更加适合锌基MOFs吸附Cu(II)、Hg(II)和Pb(II)的过程,经过Langmuir模型拟合计算锌基MOFs材料对于Cu(II)、Hg(II)和Pb(II)的最大吸附容量分别为4624mg/g、4261mg/g和4874mg/g。
Claims (6)
1.一种锌基MOFs材料的制备方法,其特征在于,包括如下步骤:
(1)将有机配体溶解在水中,得到有机配体水溶液;
(2)将可溶性锌盐溶解在水中,得到含有锌离子的可溶性盐水溶液;
(3)将步骤(2)所得含有锌离子的可溶性盐水溶液与步骤(1)得到的有机配体水溶液混合,室温搅拌一定时间,反应结束后,将产物离心、过滤,干燥,得到锌基MOFs材料。
2.根据权利要求1所述一种锌基MOFs材料的制备方法,其特征在于:步骤(1)中,所述有机配体为2,4,6-三氨基嘧啶。
3.根据权利要求1所述一种锌基MOFs材料的制备方法,其特征在于:步骤(2)中,所述可溶性锌盐为硝酸锌、醋酸锌、硫酸锌、氯化锌中的一种或多种。
4.根据权利要求1所述一种锌基MOFs材料的制备方法,其特征在于:可溶性锌盐和有机配体的摩尔比为1:1~6。
5.根据权利要求1所述一种锌基MOFs材料的制备方法,其特征在于:步骤(3)中,可溶性锌盐水溶液和有机配体水溶液搅拌时间为30min~24h。
6.根据权利要求1~5任一项所述制备方法制得的锌基MOFs材料用于去除水中重金属Cu(II)、Hg(II)或Pb(II)的用途。
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WO2017025981A1 (en) * | 2015-08-13 | 2017-02-16 | Msn Laboratories Private Limited | Process for the preparation of methyl 4,6-diamino-2-[l-(2-fhiorobenzvr)-lh-pyrazolo i3,4-blpvridin-3-vn-5-pyrimidinyl(methvl)carbamate and its polymorphs thereof |
CN111471188A (zh) * | 2020-04-30 | 2020-07-31 | 福州大学 | 一种高容量吸附铅离子的氨基功能化MOFs材料的制备及应用 |
CN111363162A (zh) * | 2020-05-12 | 2020-07-03 | 烟台大学 | 一种锌配合物单晶及其制备方法和吸附水中铅离子应用 |
CN112979979A (zh) * | 2021-02-23 | 2021-06-18 | 云南省水利水电科学研究院 | 用于吸附去除水体中微污染汞的改性zif-8材料制备方法及应用 |
CN113750971A (zh) * | 2021-09-27 | 2021-12-07 | 中原工学院 | 一种基于锌配合物的吸附材料及其制备方法和应用 |
US20230407500A1 (en) * | 2022-06-17 | 2023-12-21 | King Fahd University Of Petroleum And Minerals | Polytriaminopyrimidine (g-ptap) photocatalyst for overall water splitting |
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