scholarly journals Systematic study of TiO2/ZnO mixed metal oxides for CO2 photoreduction

RSC Advances ◽  
2019 ◽  
Vol 9 (38) ◽  
pp. 21660-21666 ◽  
Author(s):  
Warren A. Thompson ◽  
Alberto Olivo ◽  
Danny Zanardo ◽  
Giuseppe Cruciani ◽  
Federica Menegazzo ◽  
...  
Keyword(s):  
Design Of Experiments ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Systematic Study ◽  
Mixture Design ◽  
Mixed Metal Oxide ◽  
Mixed Metal Oxides ◽  
Systematic Design ◽  
Co2 Photoreduction ◽  
Mixed Metal

A novel example using a systematic design of experiments mixture design for developing mixed metal oxide photocatalysts for CO2 photoreduction.

scholarly journals Efficient Removal of Cr(VI) with Fe/Mn Mixed Metal Oxide Nanocomposites Synthesized by a Grinding Method

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Wang Weilong ◽  
Fu Xiaobo
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Adsorption Capacity ◽  
Mixed Metal Oxide ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Surface Areas ◽  
Grinding Method ◽  
Xps Characterization ◽  
Enhanced Adsorption

Fe/Mn mixed metal oxides were synthesized facilely by a grinding method and were characterized by TEM, XRD, XPS, and BET. The characterization results revealed that mixed metal oxides were mainly composed of not highly crystallized Fe2O3and Mn3O4nanoparticles with a diameter about 3–5 nm. The specific BET surface areas of the composite were affected by the amounts of KCl diluent in the preparation process and about 268 m2/g of the composite can be achieved. Compared with metal oxide adsorbents existent, the composites showed good adsorption capacity, stability, and regeneration activity for Cr(VI) removal. The enhanced adsorption capacity was speculated to be ascribed to the synergistic effect of the mixed metal oxides. By monitoring the valence change in the adsorption process using XPS characterization, the mechanism for Cr(VI) removal on the composites was found to be a combination of electrostatic attraction and ion exchange. The above results demonstrated that the synthesized metal oxides nanocomposite is of great potential for Cr(VI) removal in the fields of remediation of environmental problems.

The pseudo-capacitive deionization behaviour of CuAl-mixed metal oxides

2020 ◽  
Vol 6 (2) ◽  
pp. 296-302 ◽  
Author(s):  
Wen Xi ◽  
Haibo Li
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Chloride Ions ◽  
Mixed Metal Oxide ◽  
Mixed Metal Oxides ◽  
Capacitive Deionization ◽  
Mixed Metal

In this work, a laminated CuAl-mixed metal oxide (CuAl-LDO) has been prepared and proposed as an electrode to interact with chloride ions for pseudo-capacitive deionization (P-CDI).

scholarly journals Mixed Metal Oxide Mesoporous Nanoparticles For Environmental Remediation

2019 ◽  
Vol 6 (2) ◽  
pp. 61-65
Author(s):  
Nithya Davis ◽  
Usha Rajalakshmi P ◽  
Sakthivel T
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Environmental Remediation ◽  
Oxide System ◽  
Mixed Metal Oxide ◽  
Blue Dye ◽  
Ammonium Bromide ◽  
Mixed Metal Oxides ◽  
Structure Directing Agent ◽  
Mixed Metal

Mesoporous mixed metal oxides (SnO2(x) -TiO2 (1-x) , x= 0.75,0.50 and 0.25) were synthesized by evaporation induced self assembly using cationic surfactant, Cetyl Trimethyl Ammonium Bromide (CTAB) as the structure directing agent. The small angle X-ray diffraction pattern of mesoporous SnO2 and SnO2-TiO2 mixed metal oxides revealed the presence of well defined mesostructure in the metal oxides. The mixed metal oxide system has crystallized in orthorhombic structure, resembling the host lattice. Mesopore channels were collapsed upon calcinations at 550°C. The optical absorption of the SnO2 has been extended into the visibleregion upon incorporation of “Ti”. A remarkable enhancement of the photocatalytic degradation efficiency (60% ) of (SnO2(0.5) -TiO2 (0.5) was observed against aqueous solution of methylene blue dye.

scholarly journals The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2554
Author(s):  
Artem Marikutsa ◽  
Marina Rumyantseva ◽  
Elizaveta A. Konstantinova ◽  
Alexander Gaskov
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Active Sites ◽  
Noble Metals ◽  
Material Composition ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Sensor Materials ◽  
The Impact

Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

Mixed Metal Oxide Synthesis by Thermolyses of Simple Heteropolymetallic Precursors in Oxygen

1991 ◽  
Vol 249 ◽  
Author(s):  
Geoffrey Davies ◽  
Bill C. Giessen ◽  
Hui-Li Shao
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Large Family ◽  
Molecular Target ◽  
Mixed Metal Oxide ◽  
Aprotic Solvents ◽  
Mixed Metal ◽  
Highly Dispersed

ABSTRACTStepwise transmetalation of the neutral molecular target (µ4-O)N4 Cu4 C16(N is a monodentate pyridine) with M(NS)n transmealators (NS is a monanionic S-methyl hydrazinecarbodithioate ligand, M is Co (n = 2 or 3), Ni or Zn (n = 2)) in aprotic solvents gives a large family of heteropolymetallic products (µ4 - O)N4 (Co,Ni,Cu,Zn)4 C16 that contain from one to four different metals. Thermolysis of these solid products in flowing O2 at 220 - 250°C gives uniform, highly dispersed mixtures of the respective metal oxides. For example, thermolysis of bulk precursor (µ4 -O)N4 CoNiCuZnCl6 gives a uniform mixture of 1 - 2° particles of Co3 O4, NiO, CuO and ZnO.

Flux-mediated crystal growth of metal oxides: synthetic tunability of particle morphologies, sizes, and surface features for photocatalysis research

CrystEngComm ◽  
2015 ◽  
Vol 17 (11) ◽  
pp. 2225-2241 ◽  
Author(s):  
Jonathan Boltersdorf ◽  
Nacole King ◽  
Paul A. Maggard
Keyword(s):  
Crystal Growth ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Surface Features ◽  
P Flux

Flux crystal growth of mixed-metal oxide photocatalysts with (A) rod- and (B) platelet-shaped morphologies grown under varied flux conditions.

Bimetallic Mixed Metal Oxide (CuO/NiO) In Fusion with Nitrogen-doped Graphene Oxide: An Alternate Approach for Developing Potential Biocarrier

2021 ◽  
pp. 105781
Author(s):  
Periasamy Anbu ◽  
Subash C.B. Gopinath ◽  
Kandasamy Saravanakumar ◽  
Sekar Vijayakumar ◽  
Santheraleka Ramanathan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Metal Oxide ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Rare earth—platinum group mixed metal oxide systems

1994 ◽  
Vol 210 (1-2) ◽  
pp. 177-184 ◽  
Author(s):  
K.M. Cruickshank ◽  
F.P. Glasser
Keyword(s):  
Rare Earth ◽  
Metal Oxide ◽  
Mixed Metal Oxide ◽  
Oxide Systems ◽  
Mixed Metal ◽  
Platinum Group
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