Abstract:Calcium titanate (CaTiO3), strontium titanate (SrTiO3), and strontium calcium titanate (SrxCa1−xTiO3) are widely recognized and utilized as dielectric materials. Their electrocatalytic properties, however, have not been extensively examined. The aim of this research is to explore the electrocatalytic performance of calcium titanate, strontium titanate, and strontium calcium titanate, as potential sensing materials. Experimental results revealed that CaTiO3, SrTiO3, and Sr0.5Ca0.5TiO3 powders synthesized by the… Show more
“…On the other hand, the E g values for CaTiO 3 and MgTiO 3 were observed to be 3.0 eV and 3.12 eV, respectively which are slightly higher than those of their oxides. The E g value for CaTiO 3 was reported to be in the range of 3.0–3.6 eV versus SHE, while the E g value for MgTiO 3 was in the range of 3.0–3.2 eV versus SHE 21 , 36 , 39 , 43 . Figure 4 Tauc’s Plots for bandgap estimation of ( a ) CaO, ( b ) CaTiO 3 , ( c ) MgO and ( d ) MgTiO 3 .…”
Section: Resultsmentioning
confidence: 99%
“…The absorption peaks at 1477 and 874 cm −1 are attributed to the C–O asymmetrical and symmetrical vibrations. The bands that appeared at 459 cm −1 are due to the existence of Ca–O metal oxide which was transformed from CaCO 3 in the eggshells 36 , 37 . In the case of CaTiO 3 , the broad peaks at around 3311 and 1419 cm −1 in Fig.…”
The current investigation deals with the simple and ecological synthesis of CaO, MgO, CaTiO3, and MgTiO3 for the photocatalytic dilapidation of rhodamine B dye. CaO was procured from chicken eggshell waste by calcination process, while MgO was produced by solution combustion method using urea as a fuel source. Furthermore, CaTiO3 and MgTiO3 were synthesized through an easy and simple solid-state method by mixing thoroughly the synthesized CaO or MgO with TiO2 before calcination at 900 °C. XRD and EDX investigations confirmed the phase formation of the materials. Moreover, FTIR spectra revealed the existence of Ca–Ti–O, Mg–Ti–O, and Ti–O which resembles the chemical composition of the proposed materials. SEM micrographs revealed that the surface of CaTiO3 is rougher with relatively dispersed particles compared to MgTiO3, reflecting a higher surface area of CaTiO3. Diffuse reflectance spectroscopy investigations indicated that the synthesized materials can act as photocatalysts under UV illumination. Accordingly, CaO and CaTiO3 effectively degraded rhodamine B dye within 120 min with a photodegradation activity of 63% and 72%, respectively. In contrast, the photocatalytic degradation activity of MgO and MgTiO3 was much lower, since only 21.39 and 29.44% of the dye were degraded, respectively after 120 min of irradiation. Furtheremore, the photocatalytic activity of the mixture from both Ca and Mg titanates was 64.63%. These findings might be valuable for designing potential and affordable photocatalysts for wastewater purification.
“…On the other hand, the E g values for CaTiO 3 and MgTiO 3 were observed to be 3.0 eV and 3.12 eV, respectively which are slightly higher than those of their oxides. The E g value for CaTiO 3 was reported to be in the range of 3.0–3.6 eV versus SHE, while the E g value for MgTiO 3 was in the range of 3.0–3.2 eV versus SHE 21 , 36 , 39 , 43 . Figure 4 Tauc’s Plots for bandgap estimation of ( a ) CaO, ( b ) CaTiO 3 , ( c ) MgO and ( d ) MgTiO 3 .…”
Section: Resultsmentioning
confidence: 99%
“…The absorption peaks at 1477 and 874 cm −1 are attributed to the C–O asymmetrical and symmetrical vibrations. The bands that appeared at 459 cm −1 are due to the existence of Ca–O metal oxide which was transformed from CaCO 3 in the eggshells 36 , 37 . In the case of CaTiO 3 , the broad peaks at around 3311 and 1419 cm −1 in Fig.…”
The current investigation deals with the simple and ecological synthesis of CaO, MgO, CaTiO3, and MgTiO3 for the photocatalytic dilapidation of rhodamine B dye. CaO was procured from chicken eggshell waste by calcination process, while MgO was produced by solution combustion method using urea as a fuel source. Furthermore, CaTiO3 and MgTiO3 were synthesized through an easy and simple solid-state method by mixing thoroughly the synthesized CaO or MgO with TiO2 before calcination at 900 °C. XRD and EDX investigations confirmed the phase formation of the materials. Moreover, FTIR spectra revealed the existence of Ca–Ti–O, Mg–Ti–O, and Ti–O which resembles the chemical composition of the proposed materials. SEM micrographs revealed that the surface of CaTiO3 is rougher with relatively dispersed particles compared to MgTiO3, reflecting a higher surface area of CaTiO3. Diffuse reflectance spectroscopy investigations indicated that the synthesized materials can act as photocatalysts under UV illumination. Accordingly, CaO and CaTiO3 effectively degraded rhodamine B dye within 120 min with a photodegradation activity of 63% and 72%, respectively. In contrast, the photocatalytic degradation activity of MgO and MgTiO3 was much lower, since only 21.39 and 29.44% of the dye were degraded, respectively after 120 min of irradiation. Furtheremore, the photocatalytic activity of the mixture from both Ca and Mg titanates was 64.63%. These findings might be valuable for designing potential and affordable photocatalysts for wastewater purification.
“…Specific surface area of 8.69 m 2 g −1 was observed. Assuming that the particles are spherical, nonporous and also the theoretical density of the individual materials, the relationship between particle size and specific surface area was expressed by the following equation (5) [13]:…”
Section: Microstructure and Specific Surface Areamentioning
Dopamine (DA) is an essential neurotransmitter which plays important roles in human's biological and cognitive processes, specifically learning, memory, emotions, and movements. Abnormality of dopamine level can signal the trace of neurological diseases. Dopamine detection, therefore, can be useful in detection of symptoms and diseases related to brain disorders such as Parkinson's and depression. This study aimed at examining usage of hematite iron oxide (Fe 2 O 3 ) as electrochemical sensors for dopamine detection. Nanoparticulate Fe 2 O 3 was synthesized, microstructurally examined, and tested for its electrocatalytic activities. The synthesized powder showed a single phase with an average particle size of 93.9 nm. Electrocatalytic activities of the powder, measured in dopamine hydrochloride solutions with concentrations ranging from 0.1 to 10 μM, were evaluated by cyclic voltammetry technique. At applied voltage of 0.33 V, peak currents corresponding to oxidation reactions between dopamine and Fe 2 O 3 electrode were detected. With sensitivity of Fe 2 O 3 electrode in the range between 0.021 and 0.033 μA μM −1 , the Fe 2 O 3 nanoparticles exhibited fair sensing ability.
“…Nanoparticulate doped-metal oxides emerge as promising sensor candidates. This is attributed to substantial reactive sites on surface and enhanced electron transfer [8][9][10][11]. According to Yu et al, high electronic conductivity was observed in nanoparticulate Zndoped TiO2 [12].…”
Acetylcholine (ACh) is a main neurotransmitter functioning in smooth muscle and cardiovascular system control. It also plays a key role in memory and learning. While excessive acetylcholine level results in decreased heart rates, depleted level of acetylcholine in human brains can lead to Alzheimer disease. Therefore, detection of acetylcholine is clinically vital. This study aimed at examining potential usage of titanium dioxide (TiO2) doped with 2.5 mol% Zn as electrochemical sensors for acetylcholine detection. Zn-doped TiO2 powder was synthesized by a solution combustion technique. Phase identification, microstructural examination, as well as electrocatalytic activity evaluation of the synthesized powder were conducted. The synthesized powder showed anatase phase with fine particle sizes ranging from 9.3 to 11.4 nanometers on average. Specific surface area of 75.48 m2/g was observed. Electrocatalytic activities of the powder in cholin acetate solutions with concentrations ranging from 0.05 to 0.1 μM and 1 to 10 μM were evaluated via cyclic voltammetry technique. At applied voltage of 0.05 V, peak currents corresponding to oxidation reactions between ACh and Zn-doped TiO2 were detected. Sensitivity values of 3.13x10-4 and 1.32 μA/(μMmm2), which is in an acceptable range, were evident.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
