【摘要】：金屬有機(jī)框架材料(MOFs)是一種新型的多孔晶體材料,具有規(guī)則的孔洞結(jié)構(gòu)、高的孔隙率和大的比表面積、結(jié)構(gòu)和性質(zhì)的多樣性和可調(diào)性等特點(diǎn),使得由其制成的薄膜,在氣體分離、氣敏傳感、薄膜催化等領(lǐng)域具有重要應(yīng)用。但是,當(dāng)前MOF膜的制備存在異質(zhì)成核困難、高能耗、使用昂貴有機(jī)溶劑和易產(chǎn)生缺陷裂紋等問題。因此,我們探索利用氫氧化鋅納米結(jié)構(gòu)作為金屬前軀體,發(fā)展一種簡單有效經(jīng)濟(jì)環(huán)保的制備Zn-MOF膜的新方法。主要內(nèi)容為：1.首先利用氫氧化鋅納米結(jié)構(gòu)作為前軀體,制備了致密的MOF-5膜。同時(shí)發(fā)現(xiàn)對苯二甲酸除了作為配體之外,還能起到封端劑的作用,獲得了不同形貌的ZnO六方微晶,并研究了其生長機(jī)制和光致發(fā)光性能。2.利用氫氧化鋅納米結(jié)構(gòu)作為唯一鋅源,在室溫下,水和乙醇溶劑中,合成了厚度約為800 nm,連續(xù)的ZIF-8膜。氫氧化鋅納米結(jié)構(gòu)還表現(xiàn)了明顯的結(jié)構(gòu)導(dǎo)向作用。這種方法具有很好的通用性,適宜規(guī)模化生產(chǎn)。3.將以氫氧化鋅納米結(jié)構(gòu)為前軀體獲得的ZIF-8膜作為晶種,經(jīng)過二次生長獲得了形貌更好,厚度約為2.5μm的ZIF-8膜。將其用于單組分氣體分離性能研究,H2/CO2, H2/N2和H2/CH4的理想分離因子分別為3.58,12.53和9.76,遠(yuǎn)大于Knudsen分離因子,其中H2的通量約為47.14*10-7 mol·m-2·s-1·Pa-1,并且表現(xiàn)了很好的可重復(fù)性和持久性。
[Abstract]:Organometallic frame material (MOFs) is a new porous crystalline material with regular pore structure, high porosity and large specific surface area, diversity of structure and properties, and tunability. It has important applications in gas separation, gas sensing, film catalysis and so on. However, the preparation of MOF films is difficult to nucleate heterogeneity, high energy consumption, the use of expensive organic solvents and easy to produce defects and cracks. Therefore, we have explored a new method of preparing Zn-MOF membrane by using zinc hydroxide nanostructure as metal precursor and developing a simple, economical and environmentally friendly method. The main contents are as follows: 1. A compact MOF-5 film was prepared by using zinc hydroxide nanostructure as precursor. It was also found that terephthalic acid could also act as a capping agent in addition to being a ligand. Different morphologies of ZnO hexagonal microcrystals were obtained. The growth mechanism and photoluminescence properties were studied. 2. Using zinc hydroxide nanostructure as the sole zinc source, a continuous ZIF-8 film with a thickness of about 800 nm, was synthesized at room temperature in water and ethanol solvent. Zinc hydroxide nanostructures also exhibit obvious structural orientation. This method has good versatility and is suitable for large-scale production. The ZIF-8 film obtained from zinc hydroxide nanostructure as the precursor was used as seed, and the ZIF-8 film with a thickness of about 2.5 渭 m was obtained by secondary growth. The ideal separation factors of H _ 2 / CO _ 2, H2/N2 and H2/CH4 were 3.58% 12.53 and 9.76, respectively, which were much higher than those of Knudsen. The H _ 2 flux is about 47.14 ~ (- 7) mol m ~ (-2) s ~ (-1) Pa-1, and has good repeatability and persistence.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1;O627

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