Figure 3.

(A) Schematic representation of 4-NP degradation using CaCO₃/CuS. Reprinted from Zhang et al. (2020b), Copyright (2020) American Chemical Society; (B) Illustrative degradation of TC-HCl over PbS/CaCO₃ catalyst. Reprinted from Zhang et al. (2020a), Copyright (2020), with permission from Elsevier; (C) Schematic representation of 4-NP degradation using CuO/ZnO/eggshell. Reprinted by permission from Springer Nature Customer Service Centre GmbH: Springer Nature (Zhang et al., 2019a), Copyright (2019).