Fig. 1. Preparation and degradation process diagram of photothermal membrane(PTM)

Fig. 2. Morphologies of carbon fiber (CF) and Fe₃O₄. (a)‒(c) SEM images of carbon fiber; (d)‒(f) TEM images of carbon fiber; (g)‒(h) SEM images of Fe₃O₄; (i) TEM image of Fe₃O₄

Fig. 3. XRD spectra, N₂ adsorption-desorption diagram, pore size diagram, and visible light absorption spectrum of the prepared samples. (a) XRD pattern of Fe₃O₄; (b) XRD pattern of MgCO₃·3H₂O fiber; (c) XRD patterns of carbon fiber and MgO-C fiber; (d) N₂ adsorption-desorption diagram of carbon fiber; (e) pore size analysis diagram of carbon fiber; (f) PTM's absorption rate of sunlight in the visible light band

Fig. 4. PTM contact angle tests and physical and infrared photos during catalytic degradation process. (a) PTM contact angle test: top hydrophobic image; (b) PTM contact angle test: bottom hydrophilic image; (c) experimental photo and physical image of PTM (upper right); (d) infrared image of the side and top (upper right) of the beaker; (e) picture of solution after catalytic degradation

Fig. 5. Influence of different parameters on the degradation of RhB photo-Fenton. (a) Influence of different conditions; (b) influence of pH value on the degradation of RhB; (c) influence of the amount of H₂O₂ on the degradation of RhB; (d) influence of solar radiation density on the degradation of RhB

Fig. 6. Schematic of high-efficiency photo-Fenton catalytic system

Table 1. Photo-Fenton catalytic cycle test of PTM