50 Characterization of Copper Oxide (CuO) from Recovery of Cu- Foil Waste by Hydrometallurgical Methods: Acid Leaching and Precipitation W. Dwiana 1 , M. N. Ikhsanudin 2,3 , H. S. E. A. Gustiana 2,4* , R. Suryana 1 1. Department of Physics, Faculty of Mathematics and Science Universitas Sebelas Maret 2. Centre of Excellence for Electrical Energy Storage Technology, University of Sebelas Maret, Surakarta 57146, Central Java, Indonesia 3. Department of Chemical Engineering, Faculty of Engineering, University of Sebelas Maret, Surakarta 57126, Central Java, Indonesia 4. Department of Chemical Engineering, Faculty of Vocational Studies, University of Sebelas Maret, Surakarta 57126, Central Java, Indonesia * corresponding author : himmahseag@staff.uns.ac.id Received:12-22-2022; Revised: 01-02-2023; Accepted: 03-01-2023; Published: 03-02-2023 1. Introduction Due to ever-increasing consumption and rapid technical innovation, many electronic products will eventually become e-waste [1]. E- waste is growing rapidly in the modern era with global volume increasing annually by 3- 5% [2]. This increase in the amount of e-waste is a common situation since the 2000s [3]. According to data, e-waste production surged from 33.8 million tons in 2010 to 53.6 million tons in 2019 and is estimated to reach 74 million tons by 2030 [4]. One of the important components found in electronic products is the battery. The ABSTRACT: Environmental concerns are increasing due to the rising output of electronic trash (also known as "e-waste"). Lithium-ion batteries, which are commonly used in electronic equipment as high-density energy storage, are one of the sources of e-waste. Due to the abundance of metal resources and potential environmental hazards, recycling lithium- ion battery trash has drawn a lot of interest. Recovery of valuable metals contained in lithium- ion batteries, such as Cu-foil, is one of the efforts to overcome environmental pollution due to copper metal. The hydrometallurgical method is used in the recovery process, which includes leaching using nitric acid and precipitation using oxalic acid. The material obtained was copper oxide (CuO), which was analyzed using XRD, SEM-EDX, and FTIR to determine the characteristics of the sample. XRD analysis showed that the crystallinity of CuO was by the database. SEM images confirm the presence of agglomeration and inhomogeneous particle distribution in the samples. FTIR analysis confirmed the formation of the CuO phase, and the EDX results showed the sample’s purity, consisting of Cu and O elements. Based on the research, CuO was successfully produced from the recovery of Cu-foil waste. Keywords: Cu-foil, Leaching, and Copper Oxide (CuO) Article jurnal.uns.ac.id/esta