Metal Organic Framework/α Alumina Composite with Novel Geometry for Enhanced Adsorptive Separation

Transcription

1 Metal Organic Framework/α Alumina Composite with Novel Geometry for Enhanced Adsorptive Separation Chenghong WANG (Chris) Supervisor: Prof. J. Paul Chen & Prof. Kang Li Joint NUS NGS Imperial College London PhD Programme September 2016

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3 Overview Introduction on MOF/alumina composite Adsorptive separation study Arsenic contaminated water remediation Discussion & Future work Wang, C. et al., Chem. Commun., 2016, 52,

4 Adsorptive Separation Industrial process for the purification of liquid or gas mixtures. Fixed & fluidized beds Drawbacks including: 1) large pressure drop 2) channelling of fluid 3) break up of adsorbent pellets Novel concept and design! 3

5 Metal Organic Framework (MOF) Definition: Inorganic metal ions or metal containing clusters + organic ligands Unique features of this porous material: large surface area & great porosity customizable chemical functionalities relatively mild synthesis conditions Zr MOF UiO 66: Zirconium oxide unit + BDC linker Applications: adsorption, separation, sensing, catalysis, etc. 4

6 UiO 66 Adsorbent Hydro stable, even under acidic or some alkaline conditions UiO 66 for aquatic arsenic adsorption (Scientific Reports, 16613, 2015) Wide ph working range (1 10) Great thermodynamic capacity (303 mg/g) Fast kinetic behaviour To be industrially applied => Binder problem? 5

7 α Alumina Abundant supply in raw material & great resistance to various conditions Hollow fibre structure with novel geometry as advanced matrix micro channels serving as reaction chamber thin barrier layer serving as sieve Introduction (materials) Performance Study Discussion 6

8 MOF/α Alumina Composite Vacuum filtration method Size exclusion effect 7

9 MOF/α alumina Composite for Arsenic Contaminated Water Remediation Arsenic pollutant removal from water Arsenic contamination is a global threat due to its toxicity and carcinogenicity Arsenic concentration in most contaminated water ranges from ppm. 1 ppm as the feed concentration 8

10 MOF/α alumina Composite for Arsenic Contaminated Water Remediation 9

11 Comparison Study by Packed Column Beds Inferior performance Random packing & non ideal flow Even worse when limited amount of adsorbent were used 10

12 MOF/α alumina Composite for Arsenic Contaminated Water Remediation Alternative concept for adsorptive separation Micro channels adsorbent distribution transport network (reduced mass transfer resistance) more ideal flow Barrier layer separation for suspended solids & micro organisms Binder problem solved Module assembled 11

13 MOF/α alumina Composite for Arsenic Contaminated Water Remediation Alternative concept for adsorptive separation Micro channels adsorbent distribution transport network (reduced mass transfer resistance) more ideal flow Barrier layer separation for suspended solids & micro organisms Binder problem solved Module assembled 12

14 Revisit Key Points MOF/α alumina composite with novel geometry was developed for enhanced adsorptive separation The composite is able to produce potable water recovery from arsenic contaminated water To achieve a similar performance, the packed column bed required 8X amount of active UiO 66 adsorbents 13

15 Future Work More functional composites can be formed, based on the application purpose and the functionality of adsorbents Gas chromatography separation, Catalytic reaction, etc. 14

16 References & Acknowledgement Pictures used are adopted from Google Images without financial purposes. I. Ali, Chem Rev, 2012, 112, H. Furukawa, K. E. Cordova, M. O'Keeffe and O. M. Yaghi, Science, 2013, 341, H. C. Zhou and S. Kitagawa, Chem Soc Rev, 2014, 43, N. A. Khan, Z. Hasan and S. H. Jhung, J Hazard Mater, 2013, , 444. J. H. Cavka, S. Jakobsen, U. Olsbye, N. Guillou, C. Lamberti, S. Bordiga and K. P. Lillerud, J Am Chem Soc, 2008, 130, C. Wang, X. Liu, J. P. Chen and K. Li, Sci Rep, 2015, 5, J. He, T. S. Siah and J. Paul Chen, Water Res., 2014, 56, 88. M. Lee, B. Wang and K. Li, J. Membr. Sci., 2016, 503, 48. X. Liu, N. K. Demir, Z. Wu and K. Li, J Am Chem Soc, 2015, 137, J. He, T. Matsuura and J. P. Chen, J. Membr. Sci., 2014, 452, 433. K. Li, Ceramic membranes for separation and reaction, Wiley,

17 Thanks for Listening!! 16