Fabrication of Mesoporous PtO–ZnO Nanocomposites with Promoted Photocatalytic Performance for Degradation of Tetracycline

Abstract

Herein, we report a simple incorporation of PtO NPs at diverse percentages (0.2−0.8 wt %) onto a highly crystalline and mesoporous ZnO matrix by the wet-impregnation approach for degradation of tetracycline (TC) upon visible light exposure. These well-dispersed and small-sized PtO NPs provide the mesoporous PtO−ZnO nanocomposites with outstanding photocatalytic performance for complete TC degradation. The optimized 0.6% PtO−ZnO photocatalyst exhibits excellent TC degradation, and its degradation efficiency reached ∼99% within 120 min. The photocatalytic performance of the 0.6% PtO−ZnO nanocomposite is 20 and 10 times higher than that of pristine ZnO and commercial P-25, respectively. The photodegradation rate of TC over the 0.6% PtO−ZnO nanocomposite is 34 and 12.5 times greater than that of pristine ZnO and commercial P-25, respectively. This is because of the large surface area, unique porous structure, synergistic effect, and broad visible light absorption of the PtO−ZnO nanocomposite. Moreover, mesoporous PtO−ZnO nanocomposites showed a high stability and recyclability over five iterations. This work demonstrates the remarkable role of combining PtO and ZnO photocatalysts in providing nanocomposites with significant potential for the preservation of human health through wastewater remediation.

A Novel Platinum Modified Barium Zirconate-Based Electrolyte for Enhanced Solid Oxide Fuel Cell Performance

“…In addition, it is obvious from Figure 3(c) that a d-spacing value of 0.300 nm corresponds to (110) planes of BaZrO3-based material as reported by reference [21]. Conversely, a d-spacing value of 0.21 nm corresponds to the (110) planes of Pt-based materials, as depicted in Figure 3(b) [22,23]. This compelling evidence confirms the presence of Pt generated at the grain boundaries.…”

Synergistic photo-enhanced electrocatalysis of Pt–ZnO–Bi2O3 heterojunction for methanol oxidation under visible light illumination

“…It indicates that the ZnO–Bi 2 O 3 heterojunction shows strong absorbance at 371 nm (redshift of absorption edge) compared to ZnO (272 nm) and Bi 2 O 3 (254 nm) and tail absorption was noticed in the visible region because of the Pt deposition in Bi 2 O 3 and all ZnO–Bi 2 O 3 catalysts. 59,72–74 The inclusion of Pt to ZnO also induces light absorption towards the visible zone. 75,76 This might be due to the presence of a small amount of impurity in metallic Pt, i.e.…”

“…70,71 The ZnO (272 nm) and Bi2O3 (254 nm) and a tail absorption was noticed in the visible region because of the Pt deposition in Bi2O3 and all ZnO-Bi2O3 catalysts. 59,[72][73][74] The inclusion of Pt to ZnO also induces light absorption towards the vis zone. 75,76 This might be due to the presence of a small amount of impurity in metallic Pt ie, PtO or Pt(OH)2, and PtO2 on the surface of ZnO-Bi2O3.…”

“…69 The band at 892 cm À1 is due to the Zn-O-Bi stretching vibration. 70,71 The optical properties of Pt-Bi 59,[72][73][74] The inclusion of Pt to ZnO also induces light absorption towards the visible zone. 75,76 This might be due to the presence of a small amount of impurity in metallic Pt, i.e., PtO or Pt(OH) 2 , and PtO 2 on the surface of ZnO-Bi 2 O 3 .…”

Mesoporous zinc platinate and platinum nanotubes: insights into the formation mechanism and their catalytic activity

“…51 The hybrid PtO-ZnO shows enhanced catalytic and sensing properties as compared to ZnO due to the modification of the band structure. 52,53 There has been a consistent effort to synthesize mesoporous Pt nanostructures with tailored architecture over the years. 54,55 However, the reports on bulk scale synthesis of mesoporous Pt/Pt oxide-based nanostructures are limited.…”