THE EFFECT OF COMPOSITION AND WASHING METHODS ON THE PHYSIOCHEMICAL PROPERTIES OF PORPHYRINE MODIFIED ZEOLITITIC IMIDAZOLATE FRAMEWORK-8 (ZIF-8)
Andika Purnama Shidiq^(a), Galuh Yuliani^(a), and Agus Setiabudi^(a) *

(a) Chemistry Department, Universitas Pendidikan Indonesia
Jl. Dr. Setiabudi No.229, Isola, Kec. Sukasari, Kota Bandung, Jawa Barat 40154

Abstract

Modification of some Metal-Organic Frameworks (MOF) has been reported to change the composition and structure of the framework. The modifications might include a change in chemical compositions, pore sizes, nanoscale arrangements, as well as crystallite defects. In this study, the effect of organic linker compositions and the washing methods on the physicochemical properties of porphyrin(TCCP)-modified ZIF8 is investigated. ZIF-8 was synthesized with a molar ratio of Zn to imidazolate, as the organic linker, of 1:8. Whereas, TCCP modified ZIF-8 was prepared in Zn to Imidazolate to TCCP molar ratios of 1:7.9:0.1- 1:7.5:0.5- and 1:7:1, respectively. The just prepared TCCP modified ZIF-8 were washed by using ethanol washing followed by ordinary oven drying and methanol washing followed by vacuum drying. The physicochemical properties of the material were carried out using X-Ray Diffraction (XRD), Brunauer-Emmett-Teller (BET) adsorptions, Fourier Transform Infrared (FTIR) spectroscopy, and Thermogravimetry/Differential Thermal Analysis (TG/DTA). The XRD results showed that the TCCP modified ZIF-8 obtained by ethanol washing followed by ordinary oven drying has a crystalline structure and became amorphous as the ratio reaches 1:7.5:0.5. These data indicate a structural change in the original skeletal structure of the original ZIF-8. Meanwhile, the surface area measurement using BET showed that the TCPP-modified ZIF-8 of (1:7.9:0.1) has a much larger surface area than that of the original ZIF-8, which is 189.878 m^2/gram compared to 41.372 m^2/gram, respectively. The XRD, BET, FTIR, and TG/DTA characterization results of TCCP-modified ZIF-8 using both washing methods are in progress. In addition, the adsorption properties of TCCP-modified ZIF-8 for dye adsorption will be investigated.

Keywords: ZIF-8, Porphyrin-modified ZIF-8, Washing Method, Metal Organic Framework.

Topic: Environmental Chemistry and Engineering