scholarly journals Water treatment with CoZnAl-LDH and its mixed metal oxide

2021 ◽  
Author(s):  
Mina Sharifi-Bonab ◽  
Soheil Aber ◽  
Dariush Salari ◽  
Fatemeh Khodam
Keyword(s):  
Metal Oxide ◽  
Visible Light ◽  
Analytical Techniques ◽  
Kinetic Studies ◽  
Mixed Metal Oxide ◽  
Acid Orange 7 ◽  
Mixed Metal ◽  
Light Region ◽  
Co Precipitation ◽  
Adsorption Desorption

Abstract CoZnAl-layered double hydroxide (LDH) was synthesized by homogeneous co-precipitation. CoZnAl-Mixed Metal Oxide (MMO) was prepared by calcining the LDH. The samples' structure and morphology were studied by analytical techniques including X-ray diffraction, N2 adsorption-desorption isotherm, scanning electron microscopy and UV–visible spectroscopy. Acid orange 7 (AO7) adsorption by as-prepared samples was studied. CoZnAl-MMO showed 526.32 mg/g adsorption capacity, higher than that of CoZnAl-LDH, 243.9 mg/g. Kinetic studies confirmed the pseudo-second-order and pseudo-first-order AO7 adsorption kinetics of the LDH and MMO, respectively. AO7 adsorption onto both LDH and MMO fitted the Langmuir isotherm model well. Band gap calculation confirmed the ability of this nano-MMO to operate in the visible light region. It displayed synergetic adsorption-photocatalytic performance under visible-light and the removal efficiency was about 97%.

Synthesis of visible light-driven graphene based ZnFe mixed metal oxide for efficient degradation of tetracycline

2019 ◽  
Vol 30 (9) ◽  
pp. 8931-8943 ◽  
Author(s):  
Ying Wei ◽  
Jianxing Liang ◽  
Yan Yao ◽  
Xiangyang Xu ◽  
Xiaoke Zheng ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Visible Light ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Visible Light Driven

Anion-Doped Mixed Metal Oxide Nanostructures Derived from Layered Double Hydroxide as Visible Light Photocatalysts

2012 ◽  
Vol 23 (19) ◽  
pp. 2348-2356 ◽  
Author(s):  
Seungho Cho ◽  
Ji-Wook Jang ◽  
Ki-jeong Kong ◽  
Eun Sun Kim ◽  
Kun-Hong Lee ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Visible Light ◽  
Layered Double Hydroxide ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
Double Hydroxide

scholarly journals Microwave-Assisted Aldol Condensation of Furfural and Acetone over Mg–Al Hydrotalcite-Based Catalysts

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 833
Author(s):  
Alberto Tampieri ◽  
Matea Lilic ◽  
Magda Constantí ◽  
Francesc Medina
Keyword(s):  
Metal Oxide ◽  
Fossil Fuel ◽  
Aldol Condensation ◽  
Polymeric Materials ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Microwave Assisted ◽  
Condensation Products ◽  
Microwave Reactor ◽  
Co Precipitation

The depletion of fossil fuel resources has prompted the scientific community to find renewable alternatives for the production of energy and chemicals. The products of the aldol condensation between bio-based furfural and acetone have been individuated as promising intermediates for the preparation of biofuels and polymeric materials. We developed a protocol for the microwave-assisted condensation of these two compounds over hydrotalcite-based materials. Mg:Al 2:1 hydrotalcite was prepared by co-precipitation; the obtained solid was calcined to afford the corresponding mixed metal oxide, which was then rehydrated to obtain a meixnerite-type material. The prepared solids were characterized by PXRD, ICP-AES, TGA-DSC and N2 physisorption, and tested as catalysts in the aldol condensation of acetone and furfural in a microwave reactor. The performance of the catalysts was assessed and compared; the meixnerite catalyst proved to be the most active, followed by the mixed metal oxide and the as-synthesized hydrotalcite, which has often been reported to be inactive. In all cases, the reaction is quite fast and selective, which makes our protocol useful for rapidly converting furfural and acetone into their condensation products.

scholarly journals Facile Synthesis of Silane-Modified Mixed Metal Oxide as Catalyst in Transesterification Processes

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 245
Author(s):  
Nugroho Pranyoto ◽  
Yuni Dewi Susanti ◽  
Immanuel Joseph Ondang ◽  
Artik Elisa Angkawijaya ◽  
Felycia Edi Soetaredjo ◽  
...  
Keyword(s):  
Metal Oxide ◽  
High Performance ◽  
Fossil Fuels ◽  
Xrd Analysis ◽  
Mixed Metal Oxide ◽  
Impregnation Method ◽  
X Ray ◽  
Mixed Metal ◽  
Size And Morphology ◽  
Co Precipitation

The fast depletion of fossil fuels has attracted researchers worldwide to explore alternative biofuels, such as biodiesel. In general, the production of biodiesel is carried out via transesterification processes of vegetable oil with the presence of a suitable catalyst. A mixed metal oxide has shown to be a very attractive heterogeneous catalyst with a high performance. Most of the mixed metal oxide is made by using the general wetness impregnation method. A simple route to synthesize silane-modified mixed metal oxide (CaO-CuO/C6) catalysts has been successfully developed. A fluorocarbon surfactant and triblock copolymers (EO)106(PO)70(EO)106 were used to prevent the crystal agglomeration of carbonate salts (CaCO3-CuCO3) as the precursor to form CaO-CuO with a definite size and morphology. The materials show high potency as a catalyst in the transesterification process to produce biodiesel. The calcined co-precipitation product has a high crystallinity form, as confirmed by the XRD analysis. The synthesized catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX). The mechanism of surface modification and the effects of the catalytic activity were also discussed. The biodiesel purity of the final product was analyzed by gas chromatography. The optimum biodiesel yield was 90.17% using the modified mixed metal oxide CaO-CuO/C6.

Enhanced visible-light-driven photocatalytic removal of refractory pollutants by Zn/Fe mixed metal oxide derived from layered double hydroxide

2017 ◽  
Vol 99 ◽  
pp. 15-19 ◽  
Author(s):  
Qi Yang ◽  
Shana Wang ◽  
Fei Chen ◽  
Kun Luo ◽  
Jian Sun ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Visible Light ◽  
Layered Double Hydroxide ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Photocatalytic Removal ◽  
Visible Light Driven ◽  
Double Hydroxide

Self-Assembled Gold Nanoparticle–Mixed Metal Oxide Nanocomposites for Self-Sensitized Dye Degradation under Visible Light Irradiation

Langmuir ◽  
2012 ◽  
Vol 28 (50) ◽  
pp. 17530-17536 ◽  
Author(s):  
Seungho Cho ◽  
Ji-Wook Jang ◽  
Sekyu Hwang ◽  
Jae Sung Lee ◽  
Sungjee Kim
Keyword(s):  
Metal Oxide ◽  
Visible Light ◽  
Gold Nanoparticle ◽  
Visible Light Irradiation ◽  
Dye Degradation ◽  
Light Irradiation ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Self Assembled

scholarly journals Performance Study f V2O5/TiO2 Mixed Metal Oxide Nanocatalysts in Selective Catalytic Reduction of Nox Prepared by Co-Precipitation Method

2015 ◽  
Vol 11 ◽  
pp. 655-660 ◽  
Author(s):  
H. Soleimanzadeh ◽  
A. Niaei ◽  
D. Salari ◽  
S.M. Mousavi ◽  
A. Tarjamannejad
Keyword(s):  
Metal Oxide ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Precipitation Method ◽  
Mixed Metal Oxide ◽  
Performance Study ◽  
Mixed Metal ◽  
Reduction Of Nox ◽  
Co Precipitation
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