Syntheses of MIL-101(Cr)-SO3H by 3-step Method and its Application in Ionic Dye Adsorption

Autor: LIU, CHIA-HANG, 劉嘉航
Rok vydání: 2018
Druh dokumentu: 學位論文 ; thesis
Popis: 106
In this study, a self-made sodium sulfoisophthalate (sTA-Na) was used to synthesize mesoporous MIL-101(Cr)-SO3H. Although MIL-101(Cr)-SO3H prepared by the hydrothermal method in our laboratory has good application performance in catalyst, but it has only 206 m2/g of the specific surface area in BET pore analysis. Therefore, the three-step method was used for improving the synthesis and its concentration effect was investigated. The products were characterized by FTIR, XRD and TGA. The experimental data showed that had the same functional group, similar crystal phase, and heat resistance about 475°C, while the three-step synthesis can increase the yield from 58.33% to 94.08%. In addition, the nucleation and nucleation growth rates of MIL-101(Cr)-SO3H were adjusted by the reaction temperature and time effects to obtain single crystals with a higher specific surface area. In this study, MIL-101(Cr)-SO3H was further used as an adsorbent to study the adsorption effect of methylene blue (MB), malachite green (MG) and helianthine B (HB) in water. The adsorption efficiency was analyzed by UV-Vis. Experimental data showed that the adsorption of methylene blue (MB) by the MIL-101(Cr)-SO3H adsorbent reachs~88%; the adsorption of malachite green (MG) reachs~54%;but have adsorption performance, but have hardly any adsorption efficiency (~0%) for anionic helianthine B (HB), which indicates that MIL-101(Cr)-SO3H has a good adsorption of cationic dyes. On the other hand, when MIL-101(Cr)-NH2 was used as an adsorbent for anionic dye helianthine B (HB) the adsorption capacity can reach 99%, indicating that MIL-101(Cr)-NH¬2 has a good adsorption effect on anionic dye HB. In this study, adsorption experiments were conducted under different pH conditions. The results showed that MIL-101(Cr)-SO3H has hardly any adsorption effect on malachite green (MG) in alkaline environments, but it has good adsorption performance in environments with pH
Databáze: Networked Digital Library of Theses & Dissertations
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