PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

Silva, Wallace J. C. Da; Silva, Marcelo R. Da; Takashima, Keiko

doi:10.4067/s0717-97072015000400022

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…This is in agreement with FTIR analysis results of ZnO-CuO nanocomposite reported by Sakib et al[19], Widiarti et al[20], Saravanakkumar et al[21], Da Silva et al[22] and Allaf and Hope-Weeks[23].…”

supporting

confidence: 92%

The ZnO-CuO Nanoporous Composite Synthesized using Gum Arabic (Acacia senegalensis) as an Emerging Nanolarvicide for Culex quinquefasciatus Larvae Management

Shehu

Abba

Emmanuel

2022

eijs

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Culex quinquefasciatus is an intermediate host of several human pathogens and serve as a vector of filariasis worldwide. Recently, there are increasing efforts to develop new and effective nanoparticles to control mosquito vectors. The green synthesis of ZnO-CuO nanoporous composite using Gum Arabic (Acacia senegalensis) was successfully carried out with Gum Arabic and the composite was characterized by UV-Visible, FTIR, and SEM/EDX techniques. Three different larval instars (1st, 2nd, and 3rd) of Culex quinquefasciatus were exposed to various concentrations (10, 20, 25 mg/l) of the ZnO-CuO nanocomposite for 24 h. The LC50 values for the 1st, 2nd, and 3rd instars were found to be 4.702, 5.459, and 5.459, respectively, while the LC90 values were 22.923, 33.922, and 33.922, respectively. The correlation coefficient values for the three instars were found to be 0.982, 0.941, and 0.941, respectively, and these indicate concentration-dependent larvicidal activity. The novel ZnO-CuO nanoporous composite could serve as a new nanolarvicide against the filariasis-transmitting vector.

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confidence: 92%

The ZnO-CuO Nanoporous Composite Synthesized using Gum Arabic (Acacia senegalensis) as an Emerging Nanolarvicide for Culex quinquefasciatus Larvae Management

Shehu

Abba

Emmanuel

2022

eijs

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“…Diffuse reflectance spectroscopy (UV-vis-DRS) and further analysis of optical characteristics with the use of Tauc’s plots allow us to estimate the direct optical band gaps ( E g d ) ( Table 3 ). The obtained values correspond to the zinc oxide band gap E g d = 3.26 eV [ 44 ]; however, slightly lowering the direct bandgap values with an increase in copper content in the case of sample set 800-Cux-Zn-A suggests a change of ZnO structure by partial substitution of Zn by Cu [ 44 ]. Due to the dominance of ZnO structure features in the UV-vis-DRS signal, the direct band gaps of CuO and ZnAl 2 O 4 -like spinel were not estimated.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

et al. 2021

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Copper-containing mixed metal oxides are one of the most promising catalysts of selective catalytic oxidation of ammonia. These materials are characterized by high catalytic efficiency; however, process selectivity to dinitrogen is still an open challenge. The set of Cu-Zn-Al-O and Ce/Cu-Zn-Al-O mixed metal oxides were tested as catalysts of selective catalytic oxidation of ammonia. At the low-temperature range, from 250 °C up to 350 °C, materials show high catalytic activity and relatively high selectivity to dinitrogen. Samples with the highest Cu loading 12 and 15 mol.% of total cation content were found to be the most active materials. Additional sample modification by wet impregnation of cerium (8 wt.%) improves catalytic efficiency, especially N2 selectivity. The comparison of catalytic tests with results of physicochemical characterization allows connecting the catalysts efficiency with the form and distribution of CuO on the samples’ surface. The bulk-like well-developed phases were associated with sample activity, while the dispersed CuO phases with dinitrogen selectivity. Material characterization included phase composition analysis (X-ray powder diffraction, UV-Vis diffuse reflectance spectroscopy), determination of textural properties (low-temperature N2 sorption, scanning electron microscopy) and sample reducibility analysis (H2 temperature-programmed reduction).

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“…Moreover, ZnO oxide is classified as an intrinsic ntype semiconductor when excess electrons create a donor band, assisting the electron in jumping to the conduction band. 22 In this case, the intrinsic n-type conductivity of ZnO is followed by a high electron density of 1021 cm −3 . 23 However, ZnO can also be classified as a piezoelectric material.…”

Section: Introductionmentioning

confidence: 93%

Interfacial Chemistry with ZnO: In Operando Work Functions in Heterocells

Guerreiro

Baptista

Maia

et al. 2022

ACS Appl. Energy Mater.

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Interfacial additives such as oxides may help solve diffusion and nucleation obstacles in heterojunctions of solid-state devices. Healing strategies may rely on them, particularly in ZnO, which has numerous applications, from photovoltaics and sensors to superconductors and batteries as a lithiumphilic interlayer. Here, we show a case study based on in operando cells with two heterojunctions and the ZnO as a dielectric semiconductor. The cells show how the Cu/ZnO surface chemical potentials equalize by forming a more negatively charged region where nucleation of a new phase will likely be facilitated and the dielectric's role in interlaying with negative and positive electrodes. The highly ohmic behavior of the interface, negative electrode (metal)/dielectric, is also analyzed. The advantage of the scanning Kelvin probe (SKP) in studying the surface chemical potentials is demonstrated. Ab initio simulations used density functional theory (DFT) and hybrid functional HS06 to determine the bulk ZnO's band structure and optical properties, including relative permittivities. Aluminum, zinc, copper, and zinc oxide work functions were obtained after simulating the correspondent surfaces and compared with contact potentials obtained with SKP. The study extends hyperbolically into the cell's dimensions to understand all of the interplays of the components. An unexpected long-range equalization of the surface chemical potentials of the three cell constituents away from the interfaces may mirror a metal−insulator−metal plasmonic interaction that can be tailored for solar applications.

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PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

Cited by 10 publications

References 25 publications

The ZnO-CuO Nanoporous Composite Synthesized using Gum Arabic (Acacia senegalensis) as an Emerging Nanolarvicide for Culex quinquefasciatus Larvae Management

The ZnO-CuO Nanoporous Composite Synthesized using Gum Arabic (Acacia senegalensis) as an Emerging Nanolarvicide for Culex quinquefasciatus Larvae Management

Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

Interfacial Chemistry with ZnO: In Operando Work Functions in Heterocells

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