ZNO/MXENE AS AN EFFECTIVE CATALYST FOR METHYLENE BLUE PHOTODEGRADATION

• Main Author: E Filia Hutabarat, Wahyudi
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/83513
• Institution: Institut Teknologi Bandung

Photodegradation of dyes is one method to solve environmental problems caused by dyes pollution. Methylene blue is one of many water pollutants which hard to decompose and can absorb visible light, so that the water’s intake of light decreases. Semiconductor is a material able to degrade dyes through utilization of light energy. Photodegradation ability of ZnO which a semiconductor can enhancing through integrate the ZnO material with another nanoparticle like MXene. ZnO/MXene is expected to give more effective degradation ability in UV and visible light range due to reducing the recombination rate and widening light absorption range of ZnO. Photodegradation ability of ZnO/MXene can also enhance with facet-engineering of ZnO crystal. (002) plane is polar facet which interact more with water. Modification of facet done with variating type of straight-chain alcohol that use in ZnO synthesis. Based on XRD characterization result, for methanol, ethanol, 1-propanol, and 1 butanol the peak intensity ratio of (002) plane with peak intensity of (101) plane based on the height are 1,21; 2,98; 1,57; and 3,23 respectively. From IR characterization it is prove that ZnO successfully synthesize show with absorption from Zn-O bond in 500 cm?1 wavenumber. Calculation band gap with Kubelka Munk equation and Tauc plot for ZnO show result 3,15; 3,15; 3,14; 3,19 eV. While, band gap for ZnO/MXene with mass ration MXene:ZnO 1:10, 1:25, and 1:50 show result 3,04; 3,12; 3,13 eV, respectively. Besides, calculation of Urbach tail energy show 0,15; 0,13; 0,14; 0,10 eV for ZnO synthesized with methanol, ethanol, 1 propanol, and 1-butanol. As for Urbach tail energy of ZnO/MXene synthesized with mass ratio MXene:ZnO 1:10, 1:25, 1:50 respectively are 0,59; 0,26; and 0,09 eV. Based on photocatalytic result, observed rate constant (kobs) for ZnO/MXene with mass ratio 1:10. 1:25, and 1:50 smaller than ZnO kobs. This is probably due the adsorption ability of ZnO/MXene to methylene blue greater, so it decreases the concentration of methylene blue in solution and a lot of ZnO surface covered by MXene.