Fabrication of a visible‐light‐driven p‐type NiWO₄/n‐type SnO₂ heterojunction with efficient photocatalytic activity for degradation of Amaranth

Abstract

In this study, n‐type SnO2 was synthesized and modified with p‐type NiWO4 to create a new NiWO4/SnO2 p–n heterojunction photocatalyst for effective organic dye degradation (Amaranth). X‐ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–Vis diffuse reflection spectroscopy (DRS), and Brunauer–Emmett–Teller (BET) surface area analysis were all used to evaluate the synthesized materials. Through its internal electric field and strong driving force, the composite photocatalyst with p–n heterojunction considerably enhances charge generation and suppresses photogenerated electron–hole recombination, which would be beneficial to boost their photocatalytic performance. At 180 min, the NiWO4/SnO2 photocatalyst had the maximum efficiency for degrading Amaranth, up to 93%. Finally, the experimental results were used to rationally analyze the photodegradation mechanism.

Graphdiyne (CnH2n−2)/NiWO4 self-assembled p–n junction characterized with in situ XPS for efficient photocatalytic hydrogen production

“…Observe figure 4(b), which is the fine spectrum of O 1s. The feature peak at the binding energy of 529.71 eV is result in W-O-W bond [41][42][43]. Careful observation of the O peak in GN may indicate that the characteristic peak from NiWO 4 displaces in the orientation of improving binding energy, the characteristic peak at 532.20 eV may be the characteristic peak of both GDY and NiWO 4 .…”