Highly effectual photocatalytic degradation of tartrazine by using Ag nanoparticles decorated on Zn-Cu-Cr layered double hydroxide@ 2D graphitic carbon nitride (C3N5)

Abstract

Pollution of water resources is one of the main concerns of many countries. This issue originates from the entry of diverse pollutants, including dye compounds, into water sources. In this work, ternary Zn-Cu-Cr layered double hydroxides (LDH) supported on graphitic carbon nitride (g-C 3 N 5 ) decorated by silver nanoparticles (C 3 N 5 -LDH-Ag) was rst prepared. Application of various characterization techniques such as SEM, XRD, and FT-IR revealed that the synthesized nanocomposite was composed of Zn-Cu-Cr LDH nanoparticles, g-C 3 N 4 nanosheets, and Ag nanoparticles. The prepared nanomaterials were employed for the photodegradation of tartrazine in aqueous solutions. It was found that the C 3 N 5 -LDH-Ag catalyst outperformed their pure g-C 3 N 5 , Zn-Cu-Cr LDH, and C 3 N 5 -LDH composite in photocatalytic degradation of tartrazine under visible light irradiation. Tartrazine (20 mg/L) can be entirely removed by 0.25 g/L C 3 N 5 -LDH-Ag photocatalyst under one h visible light irradiation (200W) at pH 6 with a rapid degradation rate constant (k) that is 4.4, 3.9, and 2.6 times higher than that of pure C 3 N 5 , Zn-Cu-Cr LDH, and C 3 N 5 -LDH component, respectively. The formation of hydroxyl radicals on the surface of C 3 N 5 -LDH-Ag as the main active species was approved by the capturing experiment. The nding results approved the stability and reusability of C 3 N 5 -LDH-Ag in four photocatalytic degradation cycles. In general, our ndings revealed that the synthesized nanocomposite could be employed as an e cient photocatalyst in environmental remediation.

Impact of nitrogen doping on triazole-based graphitic carbon Nitride-TiO2 (P25) S-scheme heterojunction for improved photocatalytic hydrogen production

“…According to earlier research and DFT calculations, the construction energy of a substitutional nitrogen atom in the C1 position was significantly less than in the C2 site. 22,36 In this study, however, the construction energy of a substitutional N atom in the C2 position was considerably less than in the C1 area. As a result of its lower construction energy, C2 is more actively supportive of N atom doping.…”

“…Using 3-AT resulted in the formation of a particular N-rich CN pattern of triazole units, a substitute chemical for synthesizing CN with a larger N-content and low band energy. 36,37 Fig. 1a depicts the XRD patterns of NCNT x samples, showing all the significant diffraction peaks of produced TiO 2 .…”