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9. Synthesis of metal-organic frameworks and derived carbon for adsorptive gas separation

Author

He, Yingdian and He, Yingdian

Abstract

Gas separations have become more essential tools in the environment and energy industry driven worldwide by the increasing attention to the environment and the future energy demand. Among various commercialized technologies, adsorption-based technology has attracted increasing attention due to its unique advantages including low cost, simple operation, versatile processes, etc. Adsorbents play vital roles in separation process but conventional adsorbents (activated carbon, zeolites, silica gel and activated alumina) are unable to entirely meet the increasing requirements of the various applications in industry due to their limitations in structural diversity and flexibility. As a novel class of promising adsorbents, metal-organic frameworks (MOFs) or porous coordination polymers (PCPs) have been drawing increasing research interest for the application in gas separation thanks to their high surface area, structural diversity and tunability. As an alternative synthetic route, ligand exchange in MOFs has been intensively studied recently. However, reported ligand exchange methods are limited in their applicability to a small number of MOF families. The objectives of this work are to explore a novel synthetic strategy to extend the application of ligand exchange strategy for constructing advanced novel materials, as well as exploring of the mechanism behind the ligand exchange reaction and adsorption phenomena for the adsorbents to enable rational materials design. Furthermore, the separation performance of the novel adsorbents discovered in this project are evaluated by a variety of strategies. In first part, we report a synthetic strategy for constructing a novel flexible MOF from a rigid parent structure by ligand exchange. To the best of our knowledge, this is the first study on introducing flexible heterogeneity into a rigid structure via substantial structural rearrangement. The daughter material shows reversible transformation from a non-porous to porous structur

Published
2016

12. Biodegradation of O-chlorophenol by Rhodopseudomonas palustris PSB-1D and Optimization of Cometabolism Substrates

Author

He Yingdian, Li Liang, HU Xiao-min, and Dong Yi-hua

Subjects
biology, Substrate (chemistry), Cometabolism, Biodegradation, biology.organism_classification, chemistry.chemical_compound, chemistry, Biochemistry, Sodium propionate, Sodium citrate, Malic acid, Rhodopseudomonas palustris, Sodium acetate, Nuclear chemistry
Abstract

A strain of bacterium, Rhodopseudomonas palustris PSB-1D, which could degrade o-chlorophenol (2-CP), was isolated and screened from shallow sediment in downstream side of the sewage outfall of an insecticide factory. The strain PSB-1D could not utilize 2-CP as the sole carbon source and energy resource. However, it could degrade 2-CP in the presence of co metabolism substrates. Seven kinds of additional compounds, malic acid, sodium propionate, sodium acetate, sodium citrate, phenol, glucose and soluble starch were taken as co metabolism substrates respectively. The effect of different co metabolism substrates on the growth of PSB-1D and degradation efficiency of 2-CP was studied under the condition of illuminated anaerobic. The results showed that sodium propionate was the most efficient co metabolic substrate which improved the bacterial reproduction and degradation efficiency. On this basis, the optimizing experiments of the adding concentration of sodium propionate were carried out. The results showed that the cell density OD560 was 2.521 at culture time 8d, the half-life period of 2-CP was shortened to 4.9d, and the reaction rate constants increased to 0.1588 d-1¬¬ when the adding concentration of sodium propionate was 3 g/L. With the total cellular proteins being analyzed by SDS-PAGE, induction mechanism of the key co metabolism degradation enzyme of 2-CP was studied, which showed that the specific degrading enzyme could be induced from 2-CP itself.

Published
2011

13. Study on Nitrate-N Removal by a Catalytic Electrolysis Method in Water

Author

He Yingdian, Hu Xiaomin, Ye Shufan, and Zhang Yang

Subjects
Electrolysis, Inorganic chemistry, chemistry.chemical_element, Selective catalytic reduction, Nitrogen, Catalysis, law.invention, Ammonia, chemistry.chemical_compound, Adsorption, chemistry, law, Chlorine, Water treatment
Abstract

A new method for Nitrate-N removal in water has been presented in this paper, and related experiments have been carried out to study its technical characteristics. Results showed that in designed electrolysis system, Fe modified Ti substrate cathode can catalytic reduce NO3 –N to NH4 +-N under suitable conditions. Furthermore NH4 +-N can be oxidized to N2-N in same system by supporting of Cl-. Under the conditions of Cl- addition quantity of 500mg/L, current density of 12 mA/cm2, plate distance of 9mm, stirring intensity of 450rpm, and electrolysis time of 150min, about 94.3% NO3 –N and 94.1% TN can be removed, even no NO2 –N or NH4 +-N is produced. Moreover mechanism has been analyzed based on bimetal catalytic reduction and obtained results. The adsorption effect of Fe to O and reductant attacking may be considered as the major cause of NO3 –N reduction. And chlorine oxidation may be the reason of NH4 +-N harmlessly removing

Published
2010

15. Pd(0) loaded Zn2(azoBDC)2(dabco) as a heterogeneous catalyst.

Author

Xie, Ke, He, Yingdian, Zhao, Qinghu, Shang, Jin, Gu, Qinfen, Qiao, Greg G., and Webley, Paul A.

Subjects
*METAL-organic frameworks, *PALLADIUM, *HETEROGENEOUS catalysts
Abstract

We report a novel Pd(0) loaded metal–organic framework (MOF) catalyst, namely Pd@Zn2(azoBDC)2(dabco). The efficient catalytic activity and good recyclability of the heterogeneous catalyst carrier are demonstrated through the probe reduction reaction of 4-nitrophenol (NP) to 4-aminophenol (AP) by sodium borohydride (NaBH4). [ABSTRACT FROM AUTHOR]

Published
2017
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16. Converting 3D rigid metal–organic frameworks (MOFs) to 2D flexible networks via ligand exchange for enhanced CO2/N2 and CH4/N2 separation.

Author

He, Yingdian, Shang, Jin, Gu, Qinfen, Li, Gang, Li, Jiaye, Singh, Ranjeet, Xiao, Penny, and Webley, Paul A.

Subjects
*METAL-organic frameworks, *LIGAND exchange reactions, *CHEMICAL processes, *SEPARATION (Technology), *CHEMICAL reactions
Abstract

We report a synthetic strategy for constructing a novel flexible MOF from a rigid parent structure by ligand exchange. This is the first reported study on introducing flexible heterogeneity into a rigid structure via substantial structural rearrangement. The daughter material exhibits enhanced gas separation selectivity compared with the parent. [ABSTRACT FROM AUTHOR]

Published
2015
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19. Effects of -NO2 and -NH2 functional groups in mixed-linker zr-based MOFs on gas adsorption of CO2 and CH4

Author

Rada, Zana Hassan, Sun, Hongqi, Shang, Jin, Li, Jiaye, He, Yingdian, Liu, Shaomin, Wang, Shaobin, Rada, Zana Hassan, Sun, Hongqi, Shang, Jin, Li, Jiaye, He, Yingdian, Liu, Shaomin, and Wang, Shaobin

Abstract

Rada, Z. H., Abid, H. R., Sun, H., Shang, J., Li, J., He, Y., . . . Wang, S. (2018). Effects of -NO2 and -NH2 functional groups in mixed-linker zr-based MOFs on gas adsorption of CO2 and CH4. Progress in Natural Science: Materials International, 28(2), 160-167. Available here

20. Impact of operating parameters on CO2 capture using carbon monolith by Electrical Swing Adsorption technology (ESA).

Author

Zhao, Qinghu, Wu, Fan, He, Yingdian, Xiao, Penny, and Webley, Paul A.

Subjects
*CARBON sequestration, *MONOLITHIC reactors, *ADSORPTION (Chemistry), *ELECTRIFICATION, *JOULE-Thomson effect
Abstract

Electrical Swing Adsorption (ESA) technology is an interesting option for rapid temperature swing adsorption to capture CO 2 due to its highly efficient and rapid regeneration with the Joule effect. Electric current, electrification time and N 2 purge rate have strong effects on ESA processing performance. In this study, these operating parameters were investigated experimentally and theoretically, for their effect on CO 2 product purity, recovery, harvest time and energy consumption. For a feed stream of 15% CO 2 balanced with N 2 using a MAST© carbon monolith, CO 2 purity and energy consumption significantly increased as electric current and electrification time increased; CO 2 recovery increased as N 2 purge rate increased; these three factors all impacted on CO 2 productivity positively, that is, productivity increased with increase of each of electric current, electrification time and N 2 purge rate. The optimal conditions obtained for CO 2 capture using MAST© monolith in this study are electric current of 12 A, electrification time of 80 s and N 2 purge rate of 600 ml/min (0.088 m/s). Under such optimal condition, a CO 2 purity of 52%, and a recovery of 76% was achieved with an energy consumption of 5.64 MJ/kg.CO 2 . [ABSTRACT FROM AUTHOR]

Published
2017
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