CN110560000A - 一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法及应用 - Google Patents

一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法及应用 Download PDF

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CN110560000A
CN110560000A CN201910835889.8A CN201910835889A CN110560000A CN 110560000 A CN110560000 A CN 110560000A CN 201910835889 A CN201910835889 A CN 201910835889A CN 110560000 A CN110560000 A CN 110560000A
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纳薇
叶海船
林敏�
冷彦宜
高文桂
王�华
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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    • B01J20/226Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF]
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Abstract

本发明涉及一种Zr掺杂ZIF‑8制备Zr/ZIF‑8多孔吸附材料的方法及应用,属于吸附材料技术领域。本发明将2‑甲基咪唑溶解于NH4OH溶液中得到溶液A;将硝酸锌和硝酸锆溶解于超纯水中得到溶液B;在温度为25~26℃、搅拌条件下,将溶液A加入到溶液B中反应24~25h;固液分离,采用超纯水洗涤固体,干燥、研磨即得Zr掺杂ZIF‑8的Zr/ZIF‑8多孔吸附材料粉末。本发明利用少量Zr元素掺杂于ZIF‑8,在不破坏ZIF‑8结构的同时,提高其吸附CO2的能力,Zr/ZIF‑8吸附CO2的能力为ZIF‑8的2.2倍,在CO2吸附减排方面具有重要工业应用价值。

Description

一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法及应用
技术领域
本发明涉及一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法及应用,属于吸附材料技术领域。
背景技术
ZIF-8作为典型的金属有机框架材料,具有比表面积高、孔道结构易修饰、物理化学性能可调等特点,同时还具有更加良好的化学稳定性和热稳定性。虽然ZIF-8具有较大的比表面积和孔容,但其金属位点是Zn,Zn表面的碱性较弱,不利于CO2的吸附。而Zr元素表面碱性较强,将Zr元素掺杂在ZIF-8中,制备出新型多孔吸附材料Zr/ZIF-8,可提高ZIF-8对CO2的吸附能力。
发明内容
本发明针对现有技术存在的问题,提供一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法及应用,本发明利用少量Zr元素掺杂于ZIF-8,在不破坏ZIF-8结构的同时,提高其吸附CO2的能力。
一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,具体步骤如下:
(1)将2-甲基咪唑溶解于NH4OH溶液中得到溶液A;
(2)将硝酸锌和硝酸锆溶解于超纯水中得到溶液B;
(3)在温度为25~26℃、搅拌条件下,将步骤(1)溶液A加入到步骤(2)溶液B中反应24~25h;固液分离,采用超纯水洗涤固体,干燥、研磨即得Zr掺杂ZIF-8的Zr/ZIF-8多孔吸附材料粉末。
所述步骤(1)NH4OH溶液中NH3的含量为25%~28%。
所述步骤(1)溶液A中2-甲基咪唑的浓度为1.8~1.9mol/L。
所述步骤(2)溶液B中硝酸锌的浓度为0.6~0.7mol /L,硝酸锆的浓度为0.06~0.07mol /L。
所述步骤(3)溶液A中2-甲基咪唑与溶液B中硝酸锌、硝酸锆的摩尔比为80:9:1。
所述Zr/ZIF-8多孔吸附材料作为CO2吸附捕集剂的应用。
Zr元素掺杂于ZIF-8能够提高吸附性能的原理:
Zr元素表面存在大量碱性位点,表面碱性位点有利于吸附CO2,Zr元素的加入可提高ZIF-8材料的表面碱性,从而提高CO2吸附性能。
本发明的有益效果是:
本发明利用少量Zr元素掺杂于ZIF-8,在不破坏ZIF-8结构的同时,提高其吸附CO2的能力;Zr/ZIF-8吸附CO2的能力为ZIF-8的2.2倍,在CO2吸附减排方面具有重要工业应用价值。
附图说明
图1为实施例1中Zr/ZIF-8材料的X射线衍射分析图;
图2为实施例1中Zr/ZIF-8材料的热重分析图;
图3为实施例1中Zr/ZIF-8材料与ZIF-8材料的电镜分析图;
图4为实施例1中Zr/ZIF-8材料的氮气吸附-脱附图和孔径分布图;
图5为实施例2中Zr/ZIF-8材料的CO2-TPD图。
具体实施方式
下面结合具体实施方式对本发明作进一步详细说明,但本发明的保护范围并不限于所述内容。
实施例1:一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,具体步骤如下:
(1)将2-甲基咪唑溶解于NH4OH溶液中得到溶液A;其中NH4OH溶液中NH3的含量为25%,溶液A中2-甲基咪唑的浓度为1.90mol/L;
(2)将硝酸锌和硝酸锆溶解于超纯水中得到溶液B;其中溶液B中硝酸锌的浓度为0.60mol /L,硝酸锆的浓度为0.070mol /L;
(3)在温度为25.0℃、搅拌条件下,将步骤(1)溶液A加入到步骤(2)溶液B中反应24.0h;固液分离,采用超纯水洗涤固体,干燥、研磨即得Zr掺杂ZIF-8的Zr/ZIF-8多孔吸附材料粉末;其中溶液A中2-甲基咪唑与溶液B中硝酸锌、硝酸锆的摩尔比为80:9:1;
本实施例Zr/ZIF-8材料的X射线衍射分析图见图1;从图1可知,Zr/ZIF-8与纯ZIF-8具有相同的XRD衍射峰,没有出现其它峰,说明掺杂Zr元素后不会破坏ZIF-8的结构;
本实施例Zr/ZIF-8材料的热重分析图见图2;从图2可知,与ZIF-8相比,Zr/ZIF-8仍具有良好的热稳定性,说明掺杂Zr元素后不会破坏ZIF-8的热稳定性;
本实施例Zr/ZIF-8材料与ZIF-8材料的电镜分析图见图3;其中a为ZIF-8的电镜分析图,b为Zr/ZIF-8材料的电镜分析图,c为b图的局部放大图;从图3可知,Zr/ZIF-8仍具ZIF-8的典型形貌,说明掺杂Zr元素后不会破坏ZIF-8的形貌;
本实施例Zr/ZIF-8材料的氮气吸附-脱附图和孔径分布图见图4;其中a为氮气吸附-脱附图,b为孔径分布图,比表面积,孔容和孔径计算结果如表1所示;
表1
从表1可知,与ZIF-8相比,Zr/ZIF-8仍具ZIF-8的典型多孔结构。
实施例2:实施例1的Zr/ZIF-8的吸附CO2性能测试:
利用CO2-TPD测试Zr/ZIF-8的吸附CO2的性能:
(1)将50mg的Zr/ZIF-8置于温度为300℃条件下氮气吹扫1h;
(2)在温度为40℃条件下采用高纯CO2吸附1h,再用氮气吹扫1h;
(3)执行CO2-TPD程序,温度范围为40-250℃,升温速率为10℃/min;结果见图5,峰面积计算结果如表2所示;
表2
从图5和表2可知,Zr/ZIF-8的CO2脱附峰面积大幅度增加,峰面积由120 mV·℃增加到260 mV·℃。
实施例3:一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,具体步骤如下:
(1)将2-甲基咪唑溶解于NH4OH溶液中得到溶液A;其中NH4OH溶液中NH3的含量为26%,溶液A中2-甲基咪唑的浓度为1.80mol/L;
(2)将硝酸锌和硝酸锆溶解于超纯水中得到溶液B;其中溶液B中硝酸锌的浓度为0.65mol /L,硝酸锆的浓度为0.068mol /L;
(3)在温度为26.0℃、搅拌条件下,将步骤(1)溶液A加入到步骤(2)溶液B中反应24.6h;固液分离,采用超纯水洗涤固体,干燥、研磨即得Zr掺杂ZIF-8的Zr/ZIF-8多孔吸附材料粉末;其中溶液A中2-甲基咪唑与溶液B中硝酸锌、硝酸锆的摩尔比为80:9:1;
本实施例Zr/ZIF-8多孔吸附材的孔容和孔径计算结果如表3所示;
表3
SBET:比表面积;Vp:孔容;Dp:平均孔径;
从表3可知,与ZIF-8相比,Zr/ZIF-8仍具ZIF-8的典型多孔结构。
实施例4:一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,具体步骤如下:
(1)将2-甲基咪唑溶解于NH4OH溶液中得到溶液A;其中NH4OH溶液中NH3的含量为28%,溶液A中2-甲基咪唑的浓度为1.85mol/L;
(2)将硝酸锌和硝酸锆溶解于超纯水中得到溶液B;其中溶液B中硝酸锌的浓度为0.70mol /L,硝酸锆的浓度为0.060mol /L;
(3)在温度为25.5℃、搅拌条件下,将步骤(1)溶液A加入到步骤(2)溶液B中反应25.0h;固液分离,采用超纯水洗涤固体,干燥、研磨即得Zr掺杂ZIF-8的Zr/ZIF-8多孔吸附材料粉末;其中溶液A中2-甲基咪唑与溶液B中硝酸锌、硝酸锆的摩尔比为80:9:1;
本实施例Zr/ZIF-8多孔吸附材的孔容和孔径计算结果如表4所示;
表4
SBET:比表面积;Vp:孔容;Dp:平均孔径;
从表4可知,与ZIF-8相比,Zr/ZIF-8仍具ZIF-8的典型多孔结构。

Claims (6)

1.一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,其特征在于,具体步骤如下:
(1)将2-甲基咪唑溶解于NH4OH溶液中得到溶液A;
(2)将硝酸锌和硝酸锆溶解于超纯水中得到溶液B;
(3)在温度为25~26℃、搅拌条件下,将步骤(1)溶液A加入到步骤(2)溶液B中反应24~25h;固液分离,采用超纯水洗涤固体,干燥、研磨即得Zr掺杂ZIF-8的Zr/ZIF-8多孔吸附材料粉末。
2.根据权利要求1所述Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,其特征在于:步骤(1)NH4OH溶液中NH3的含量为25%~28%。
3.根据权利要求1所述Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,其特征在于:步骤(1)溶液A中2-甲基咪唑的浓度为1.8~1.9mol/L。
4.根据权利要求1所述Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,其特征在于:步骤(2)溶液B中硝酸锌的浓度为0.6~0.7mol /L,硝酸锆的浓度为0.06~0.07mol /L。
5.根据权利要求1所述Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法,其特征在于:步骤(3)溶液A中2-甲基咪唑与溶液B中硝酸锌、硝酸锆的摩尔比为80:9:1。
6.权利要求1~5任意一项所述Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法所制备的Zr/ZIF-8多孔吸附材料作为CO2吸附捕集剂的应用。
CN201910835889.8A 2019-09-05 2019-09-05 一种Zr掺杂ZIF-8制备Zr/ZIF-8多孔吸附材料的方法及应用 Pending CN110560000A (zh)

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CN112588324A (zh) * 2020-12-28 2021-04-02 湖南金联星特种材料股份有限公司 一锅法制备复合光催化剂CdS/ZIF-8的方法及其应用
CN112588324B (zh) * 2020-12-28 2022-04-26 湖南金联星特种材料股份有限公司 一锅法制备复合光催化剂CdS/ZIF-8的方法及其应用
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
CN114950555A (zh) * 2022-06-14 2022-08-30 淮阴师范学院 锆基单原子催化剂、制备方法及其在2,5-呋喃二甲醇选择性合成中的应用
CN114950555B (zh) * 2022-06-14 2023-08-18 淮阴师范学院 锆基单原子催化剂、制备方法及其在2,5-呋喃二甲醇选择性合成中的应用

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