fig15

Figure 15. (A) TEM image of ZnS rice grain microstructures; (B-D) Enlarged views showing ZnS nanoparticles; (D, inset) selected area diffraction pattern; (E) Powder XRD patterns of combustion-synthesized ZnS; (F) Effect of pH on Cr(VI) photocatalytic reduction (C₀ = 10 ppm, catalyst = 100 mg, pH = 2, 4, 7, 9, 11); XPS spectra of (G) Zn 2p; (H) S 2p; (I) N 1s; and (J) C 1s core levels; (K) H₂ evolution rates from water with 1M Na₂S and 1M Na₂SO₃ sacrificial agents over 5 h for all ZnS samples. Copyright 2014, Royal Society of Chemistry^[29]. TEM: Transmission electron microscopy; ZnS: Zinc sulfide; XRD: X-ray diffraction.