Physico-chemical studies of cuprous oxide (Cu2O) nanoparticlescoated on amorphous carbon nanotubes ( -CNTs)

Amorphous carbon nanotubes ( -CNTs) were synthesized by a chemical reaction between ferroceneand ammonium chloride at a temperature (∼250◦C) in an air furnace. As- synthesized -CNTs werepurified with deionized water and hydrochloric acid. A purified -CNTs were hybridized with cuprousoxide nanoparticles (Cu2O) through a simple chemical process. Morphology of the samples was analyzedwith field emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM).Fourier transform infrared (FTIR) spectra showed the attachment of acidic functional groups onto thesurface of -CNTs and the formation of hybridized -CNTs-Cu2O. Raman spectra reveal the amorphousnature of the carbon. X-ray diffraction (XRD) pattern confirmed the amorphous phase of the carbon andthe formation of Cu2O crystalline phase. The coating of Cu2O was confirmed by FESEM, TEM, and XRD.Optical absorption of the samples has also been investigated and the quantum confinement effect wasillustrated in the absorption spectra

Impact of TiO2 nanotubes’ morphology on the photocatalytic degradation of simazine pollutant

There are various approaches to enhancing the catalytic properties of TiO2, including modifying its morphology by altering the surface reactivity and surface area of the catalyst. In this study, the primary aim is to enhance the photocatalytic activity by changing the TiO2 nanotubes’ architecture. The highly ordered infrastructure is favorable for a better charge carrier transfer. It is well known that anodization affects TiO2 nanotubes’ structure by increasing the anodization duration which in turn influence the photocatalytic activity. The characterizations were conducted by FE-SEM (fiend emission scanning electron microscopy), XRD (X-ray diffraction), RAMAN (Raman spectroscopy), EDX (Energy dispersive X-ray spectroscopy), UV-Vis (Ultraviolet visible spectroscopy) and LCMS/MS/MS (liquid chromatography mass spectroscopy). We found that the morphological structure is affected by the anodization duration according to FE-SEM. The photocatalytic degradation shows a photodegradation rate of k = 0.0104 mi

TiO2 nanotubes supported Cu nanoparticles for improving photocatalytic degradation of simazine under UV illumination

Nano size Copper (Cu) incorporated TiO2 nanotubes was successfully synthesized via the anodic oxidation technique in ethylene glycol (EG) containing 0.5 wt % NH4F and 1.6 wt % KOH for the photocatalytic degradation of Simazine (2-chloro-4, 6-diethylamino-1,3,5-triazine) under Ultraviolet (UV) illumination. In the present study, the influence of different loading Cu concentrations on the formation of Cu-TiO2 nanotubes film towards the photocatalytic degradation of Simazine is reported. Based on our study, it was found that the optimum Cu loading concentration was about 0.45 wt % on TiO2 nanotubes film for approximately 64% photocatalytic degradation of Simazine after 4 h under UV illumination. This finding was mainly attributed to the uniform surface covering of the Cu loaded TiO2NTs which acted as electron traps, preventing the recombination of electron hole pairs, eventually leading to higher photocatalytic activity of our photocatalyst in degrading the targeted organic pollutant, Simazine. Moreover, an increased kinetic rate of the degradation to 0.0135 h−1 was observed in the presence of Cu in TiO2NTs

Analysis of photocurrent responses of anodized TiO2 Nanotubes synthesized from different organic electrolytes

Self-organized titanium dioxide (TiO2) nanotubes (NTs) arrays were successfully fabricated via electrochemical anodization of titanium (Ti) foil in an organic electrolyte containing 5wt% of fluoride content. The present work compares two different organic electrolytes (glycerol and ethylene glycol) for the growth of self-organized TiO2 nanotubes by using anodic oxidation strategy. The resultant TiO2 NTs were then subjected to thermal annealing for manipulating the crystalline structure. The SEM images indicated changes in surface morphology of the TiO2 NTs in different electrolytes. It was found that the NT’s dimensional was 56.00nm based on the SEM analyses. Both samples exhibited good photocurrent response; however, TiO2 NTs synthesized in ethylene glycol electrolyte showed promising photocurrent response of 0.385 mA

Effect Of Low Temperature Annealing On Anatase TIO² Layer As Photoanode For Dye-Sensitized Solar Cell

Dye-Sensitized Solar Cells (DSSCs) have been successfully fabricated with a low annealing temperature (100 °C to 500 °C) approach to the anatase TiO2 photoanode deposited by a screen-printing method. In this paper, the surface morphology and structure of the TiO2 thin films were studied using Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) and Raman Spectroscope while I-V characteristic was used for the electrical properties. Sample with an annealing temperature of 300 °C displays a good feature in terms of porosity and enhanced agglomerated surface

Synthesis and characterization of amorphous carbon nanotubes/copper oxide hybrid materials / Syazwan Hanani Meriam Suhaimy

Carbon nanotubes (CNTs) are designated as one of the most attractive material from researchers due to their unique properties and, wider range of applications. However, the synthesizing process of crystalline CNT is still a great issue because of their synthesizing process involving complicated process such as need higher operating temperature, catalyst support and expensive production cost. On the other hand, the synthesizing process of amorphous,carbon nanotubes (α-CNTs) offer a simple process. This will facilitate the producing of CNTs and open new doors to many potential applications. Therefore, we reported in this work a way of preparing α-CNT and hybridizing it with Cu2O by a simple process using ferrocene and ammonium chloride at a low temperature (~250°C) in open atmosphere. The α-CNTs produced were purified with deionized for water and HCl for obtaining a high purity of CNTs. FESEM studies show that the morphology of the α-CNTs have changed after purification process. TEM studies revealed the diameter of the α-CNT and hybridized CNT. Raman studies revealed that the CNT is amorphous structure. EDX studies show the elements present in samples, and it is found that the major element is carbon. The X-ray diffraction pattern confirmed the amorphous nature of the sample and were also confirmed the presence of Cu2O. The band gap of untreated, treated and hybridized samples were confirmed with UV-Vis studies

Impact of TiO2 Nanotubes’ Morphology on the Photocatalytic Degradation of Simazine Pollutant

There are various approaches to enhancing the catalytic properties of TiO2, including modifying its morphology by altering the surface reactivity and surface area of the catalyst. In this study, the primary aim is to enhance the photocatalytic activity by changing the TiO2 nanotubes’ architecture. The highly ordered infrastructure is favorable for a better charge carrier transfer. It is well known that anodization affects TiO2 nanotubes’ structure by increasing the anodization duration which in turn influence the photocatalytic activity. The characterizations were conducted by FE-SEM (fiend emission scanning electron microscopy), XRD (X-ray diffraction), RAMAN (Raman spectroscopy), EDX (Energy dispersive X-ray spectroscopy), UV-Vis (Ultraviolet visible spectroscopy) and LCMS/MS/MS (liquid chromatography mass spectroscopy). We found that the morphological structure is affected by the anodization duration according to FE-SEM. The photocatalytic degradation shows a photodegradation rate of k = 0.0104 min−1. It is also found that a mineralization of Simazine by our prepared TiO2 nanotubes leads to the formation of cyanuric acid. We propose three Simazine photodegradation pathways with several intermediates identified

Enhanced simazine herbicide degradation by optimized fluoride concentrations in TiO2 nanotubes growth

The performance of simazine degradation using TiO2 nanotubes is strongly influenced by the morphology and structure of the nanotubes. TiO2 nanotubes were synthesized from pristine titanium foil in EG/NH4F/KOH solution using anodic oxidation technique. This study investigates the effect of fluoride concentration in the electrolytes on the efficiency of Simazine photodegradation. We found that the optimum NH4F concentration was 0.5 wt% resulted in 57.4% degradation rate of simazine after 240 min of UV illumination. The result was attributed to the well separated, ordered and uniform structure of TiO2 nanotubes. Having the optimum fluoride concentration in electrolyte is crucial as the photodegradation performance depends on the crystal structure, surface morphology, and phase stability of the TiO2 nanotube