Photocatalytic degradation of heavy metal in dairy milk by N-doped ZnO thin film using spray coating technique

• Published in: IOP conference series. Materials Science and Engineering 2020-05, Vol.850 (1), p.12046
• Main Authors: Pratiwi, N I, Ilsatoham, M I, Asror, M Z, Sutanto, H
• Format: Article
• Language: English
• Subjects: Catalytic activity; Fourier transforms; Heavy metal content; Heavy metals; Milk; Photocatalysis; Photodegradation; Photovoltaic cells; Reduction (metal working); Spray coating; Thin films; Zinc coatings; Zinc oxide; Zinc oxides
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/850/1/012046

Zinc Oxide (ZnO) is a photocatalytic material. N-doped ZnO thin film can reduce heavy metals in milk. In the process, N-doped ZnO thin film photocatalyst is deposited on the glass by spray coating technique. N-doped ZnO thin film was characterized using UV-Vis (Ultraviolet/Visible Spectroscopy), X-Ray Diffraction (XRD) and FTIR (Fourier Transform Infrared). This study aims to investigate the reduction of heavy metals in milk due to N-doped ZnO thin film. In this study, dairy milk was obtained from farms in Central Java. Characterization results show that the band gap of N-doped ZnO thin film is 3.2 eV that N- doped ZnO thin film can function under visible light. Photocatalytic activity of prepared N-doped ZnO thin film was evaluated by the degradation of heavy metals in dairy milk. Duration of N-doped ZnO thin film degradation was found to vary from 0, 60, and 120 to 180 minutes. Heavy metal content in dairy milk is 0.5775 ppm. Addition of N-doped ZnO thin film to dairy milk reduced heavy metal content to 0.0053 ppm. In can then be inferred that heavy metal degradation using N-doped ZnO thin film is by as much as 89-99 %.