ONE POT FACILE SYNTHESIS AND THE PERFORMANCE OF N-DOPED ZnO AND (Mg,B,N)-DOPED ZnO FOR PHOTOCATALYST AND ANTIBACTERIAL APPLICATIONS : EXPERIMENTAL AND THEORETICAL INVESTIGATION
Silmi Rahma Amelia(a,c), Yusuf Rohmatullah(c), Sanusi(d), Popy Listiani(d), Yo Ichikawa(d), Honda Mitsuhiro(d), Tety Sudiarty(c), Atthar Luqman Ivansyah(a*,b))

a) Master Program in Computational Science, Faculty of Mathematics and Natural Science, Bandung Institute of Technology, Bandung, 40132, Indonesia
*atthar[at]csx.itb.ac.id
b) Instrumentation and Computational Physics Research Group, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No.10, Bandung, West Java, 40132, Indonesia
c) Deparment of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati, Bandung, 40614, Indonesia
d) Department of Physical Science and Engineering, Nagoya Institute of Technology, Japan

Abstract

Nowadays, environmental problems are increasingly varied, such as water pollution due to synthetic dye like methyl violet, and the development of various diseases caused by bacteria. Due to its ability to create defect in band gap energy and strong antibacterial activity against a variety of microorganisms, ZnO material is used to solve both issues. However, this ZnO has a large band gap energy, so it is necessary to improve its optical properties through doping. In this study, the synthesis of ZnO and ZnO doped materials (N-doped ZnO and Mg/B/N-doped ZnO) through the solid-state method was carried out. The phases of N-doped ZnO and Mg/B/N-doped ZnO are hexagonal wurtzite with crystal diameters of 30.32 nm and 27.78 nm, respectively, according to the results of the characterisation using XRD and Raman spectroscopy. Surface morphology for N-doped ZnO does not form agglomeration, while in Mg/B/N-doped ZnO, agglomeration occurs due to the difference in charge of B with Zn. The formation of peaks in UV emission (358 nm) and visible emission (520 nm and 650 nm) during PL examination indicates a reduction in the rate of electron-hole recombination and indications of defects in the ZnO lattice. The band gap energy owing to doping decreased from 3.13 eV to 3.10 eV for N: ZnO and 3.12 eV for Mg/B/N-doped ZnO at the same time, according to the UV-Vis DRS study. Photocatalyst test results showed that N-doped ZnO and Mg/B/N-doped ZnO materials were optimum for degradation of methyl violet dye for 120 minutes under visible light with degradation efficiency of 89.28% and 93.24%, respectively. For the antibacterial activity test, N-doped ZnO and Mg/B/N-doped ZnO produce inhibition zone of 7.18 mm and 14.15 mm for Escherichia coli bacteria and 7.50 mm and 11.80 mm for Staphylococcus aureus bacteria. Additionally, molecular docking studies were used to explain a potential mechanism for in vitro bacterial activity

Keywords: Antibacterial- Doped-ZnO- Molecular docking- photocatalyst

Topic: Nanomaterial and Nanotechnology