Enhancing Batik Wastewater Treatment: The Impact of Sputtering Power on Zinc Oxide (ZnO) Nano Thin Films Endrika Widyastuti1*, Ariella Melody Danny1, Dela Ayu Putriajati1, Yusron Sugiarto2, Tunjung Mahatmanto1, Ying-Chieh Lee3
1Department of Food Science and Biotechnology, Faculty of Agricultural Technology, University of Brawijaya, Malang Indonesia
2Departement of Agricultural and Biosystem Engineering Faculty of Agroindustrial Technology, University of Brawijaya, Malang Indonesia
3Institute of Precision Electronic Component, College of Semiconductor & Advanced Technology, National Sun Yat-sen University, Taiwan
The disposal of untreated wastewater from the batik industry can lead to significant environmental pollution. An effective alternative for wastewater treatment is photodegradation, which utilizes photon energy and a ZnO nano-thin film as a photocatalyst. In this study, ZnO nano-thin films were synthesized using high-power impulse magnetron sputtering (HiPIMS), followed by thermal oxidation at 400oC with varying sputtering powers (500, 900, and 1500 W) to observe their photocatalytic activities. This research aims to determine the degradation efficiency and characterize the treated effluent using ZnO nano-thin films.
The results showed that photodegradation using a ZnO nano-thin film at 500 W with 20 mM H₂-O₂- at pH 7 achieved a degradation percentage of 83.98% after 300 minutes of UVA irradiation. Furthermore, the ZnO nano-thin film reduced color by 99.9%, COD by 84.68%, BOD by 87.14%, TSS by 94.66%, Cr metal content by 99.9%, turbidity by 99.05%, total coliform by 100%, and the pH of the batik wastewater to 6.9 after photodegradation. However, ZnO nano-thin films synthesized at higher sputtering powers (900 and 1500 W) with whisker formation resulted in a reduced degradation percentage of 28.91%. Thus, photodegradation using a ZnO nano-thin film at 500 W demonstrates considerable potential as a sustainable method for treating batik wastewater and mitigating environmental pollution.
Keywords: Batik Wastewater- Photodegradation- High-power impulse magnetron sputtering (HiPIMS)
