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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
XPS survey-scan spectrum of samples before (TeCd-p) and after thermal treatment (TeCd-600) and after leaching for 2 h at 50 °C in 1 M H2SO4 (TeCd-600 H2SO4), 3 M HNO3 (TeCd-600 HNO3), and 30% H2O2 (TeCd-600 H2O2).