Synthesis and characterization of heterogeneous ZnO/CuO hierarchical nanostructures for photocatalytic degradation of organic pollutant

Tho

et al. 2021

Environ Sci Pollut Res

Photocatalytic deg radation of environmental pollutants is being up to date for the treatment of contaminated water. In the present study, ZnO/CuO nanomaterials were successfully fabricated by a simple sol-gel method and investigate the photodegradation of rhodamine B (RhB). The synthesized ZnO/CuO nanoparticles were characterized by X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS), thermal analysis (TGA), surface charge, and Fourier transform infrared spectroscopy (FTIR). The photo-degradation of the dye RhB was followed spectroscopically. The overall composition of ZnO/CuO material was found to be wurtzite phase, with particle size of 30 nm, and the Vis light absorption increased with an increase of Cu content. The ZnO/CuO nanomaterials were highly active leading to a photo-degradation of 10 ppm RhB reaching 98% within 180 min at 0.1 g/L catalyst dosage. The change in surface charge after degradation evaluated by ζ potential measurements and the differences in functional vibration group monitored by Fourier transform infrared spectroscopy (FTIR) indicates that the RhB adsorption on the Zn 45 Cu surface was insignificant. And scavenging experiments demonstrate that the RhB degradation by ZnO/CuO nanomaterials involves to some degree hydroxyl radicals.

Section: Photocatalytic Activitymentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization of novel ZnO/CuO nanoparticles, and the applications in photocatalytic performance for rhodamine B dye degradation

Tho

et al. 2021

Environ Sci Pollut Res

“…The Rietveld treatment method was successfully applied to determine the quantitative phase abundances in the prepared samples (Ling and Johnson 2004;Rodrigues et al 2010) and obtained nearly 33 and 67% monoclinic α and tetragonal β-Bi 2 O 3 phases, respectively, in all the prepared samples. The crystallite sizes calculated with the help of Scherrer's equation (Kumari et al 2020) are 32, 33, 31, and 38 nm for pure Bi 2 O 3 , BC-1, BC-2, and BC-3 samples, respectively.…”

Section: Xrd Analysismentioning

confidence: 99%

Cu2+-doped α–β phase heterojunctions in Bi2O3 nanoparticles for enhanced photocatalytic degradation of organic dye rhodamine B

et al. 2021

Self Cite

α-β Bi 2 O 3 modified with Cu 2+ ions in various compositions have been synthesized by hydrothermal process. The crystallinity, surface structure, elemental compositions and optical characteristics were uncovered by relevant techniques including XRD, SEM, EDX, XPS, PL, and UVDRS. Total organic carbon (TOC) analysis was performed to determine the dye degradation efficiency of photocatalyst. Highly crystalline Bi 2 O 3 nanoparticles consisting of α-β phase heterojunctions were observed possessing crystallite sizes in the range of 30-40 nm. The photocatalytic activity of Cu 2+ -modified Bi 2 O 3 composites was studied using RhB dye under the illumination of visible light. The results reveal that addition of Cu 2+ ions into Bi 2 O 3 lattice significantly improved the degradation rate over the pure sample. The highest activity was obtained for sample containing 2 mol % Cu in Bi 2 O 3 lattice where complete degradation of the pollutant was attained in 120 min. The increased activity is largely ascribed to the effective separation of charge carriers due to Cu 2+ doping and formation of α-β phase heterojunctions in Bi 2 O 3 .The effect of pH conditions and role of active species on degradation kinetics were also examined.

“…The crystallite size of zinc oxide and copper oxide is estimated using the Debye–Scherrer formula and presented in Figure 4 [ 50 ]. The crystallite size of zinc oxide is calculated based on the main peak corresponding to plane (101) and based on the main peak corresponding to plane (111) of tenorite copper oxide.…”

Section: Resultsmentioning

confidence: 99%

Acacia nilotica Pods’ Extract Assisted-Hydrothermal Synthesis and Characterization of ZnO-CuO Nanocomposites

2022

This work represents a novel combination between Acacia nilotica pods’ extract and the hydrothermal method to prepare nanoparticles of pure zinc oxide and pure copper oxide and nanocomposites of both oxides in different ratios. Five samples were prepared with different ratios of zinc oxide and copper oxide; 100% ZnO (ZC0), 75% ZnO: 25% CuO (ZC25), 50% ZnO: 50% CuO (ZC50), 25% ZnO: 75% CuO (ZC75), and 100% CuO (ZC100). Several techniques have been applied to characterize the prepared powders as FTIR, XRD, SEM, and TEM. The XRD results confirm the formation of the hexagonal wurtzite phase of zinc oxide and the monoclinic tenorite phase of copper oxide. The microscopy results show the formation of a heterostructure of nanocomposites with an average particle size of 13–27 nm.