Recent development in the synthesis, modification and application of Mg(OH)(2) and MgO: A review
TL;DR: Magnesium hydroxide and magnesium oxide are compounds with favorable and unique properties, leading to a broad range of opportunities for their use in science, and above all in practical applications.
About: This article is published in Powder Technology.The article was published on 2017-09-01. It has received 206 citations till now. The article focuses on the topics: Magnesium & Antibacterial agent.
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TL;DR: The research progress in the adsorption of heavy metals in water treatment by electrospun nanofibrous membranes is reviewed and may provide an insight for the development of ENFMs-based adsorbents for heavy metals separation and water purification in the future.
176 citations
TL;DR: Nanocomposite hydrogels have been widely investigated in biomedical and biotechnological fields, however, due to their poor mechanical properties and limited functions, their further applications are restricted as mentioned in this paper.
Abstract: Hydrogels mimic the tissue environment because of their hydrophilic and porous network structures. They are widely investigated in biomedical and biotechnological fields, however, due to the poor mechanical properties and limited functions, their further applications are restricted. In order to tackle these problems, an emerging approach is focused on the development of nanocomposite hydrogels. Numerous nanoparticles, including carbon-based, silica, polymeric, and metal-based nanoparticles have been incorporated into hydrogels. The combination of the two different materials results in a hybrid material with synergistic properties of both components. Nanocomposite hydrogels are designed to possess superior physicochemical and biological properties. Therefore, they are rapidly developing new materials, which have predominant applications in biological and material sciences. In this manuscript, we intended to summarize recent development in the nanocomposite hydrogels and their applications in the biomedical field.
94 citations
TL;DR: In this paper , a mathematical model of hybrid magnesium oxide (MgO) and nickel (Ni) nanofluid magnetohydrodynamic (MHD) stagnation point flow impinging on a porous elastic stretching surface in a porous medium is developed.
Abstract: In this article, motivated by novel nanofluid solar energy coating systems, a mathematical model of hybrid magnesium oxide (MgO) and nickel (Ni) nanofluid magnetohydrodynamic (MHD) stagnation point flow impinging on a porous elastic stretching surface in a porous medium is developed. The hybrid nanofluid is electrically conducted, and a magnetic Reynolds number is sufficiently large enough to invoke an induced magnetic field. A Darcy model is adopted for the isotropic, homogenous porous medium. The boundary conditions account for the impacts of the velocity slip and thermal slip. Heat generation (source)/absorption (sink) and also viscous dissipation effects are included. The mathematical formulation has been performed with the help of similarity variables, and the resulting coupled nonlinear dimensionless ordinary differential equations have been solved numerically with the help of the shooting method. In order to test the validity of the current results and the convergence of the solutions, a numerical comparison with previously published results is included. Numerical results are plotted for the effect of emerging parameters on velocity, temperature, magnetic induction, skin friction, and Nusselt number. With an increment in nanoparticle volume fraction of both MgO and Ni nanoparticles, the temperature and thermal boundary layer thickness of the nanofluid are elevated. An increase in the porous medium parameter (Darcy number), velocity slip, and thermal Grashof number all enhance the induced magnetic field. Initial increments in the nanoparticle volume fraction for both MgO and Ni suppress the magnetic induction near the wall, although, subsequently, when further from the wall, this effect is reversed. Temperature is enhanced with heat generation, whereas it is depleted with heat absorption and thermal slip effects. Overall, excellent thermal enhancement is achieved by the hybrid nanofluid.
87 citations
TL;DR: It was found that sulfuric acid hydrolysis and MgO-coating both facilitated the removal of Cr(VI) by biochars, and the maximum sorption capacities for the pristine biochar, Mgo-coated biochar (MgSHR550), and acid-assisted Mg olympic-style biochar that derived from the Langmuir isotherm model were 20.79 mg g-1.
83 citations
TL;DR: MgO NPs material from Tecoma stans (L.) flower extract is expected as a perspective adsorbent for the effective remediation of organic dyes.
83 citations
References
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TL;DR: The present review mainly focuses on NMOs' preparation, their physicochemical properties, adsorption characteristics and mechanism, as well as their application in heavy metal removal.
1,828 citations
TL;DR: In this article, the superoxide radical (HO2⇄O−2 +H+, pK=4.8) in aqueous solution has been critically assessed and the rate constants for reactions of O−2 and HO2 with more than 300 organic and inorganic ions, molecules and other transient species have been tabulated.
Abstract: Kinetic data for the superoxide radical (HO2⇄O−2 +H+, pK=4.8) in aqueous solution have been critically assessed. Rate constants for reactions of O−2 and HO2 with more than 300 organic and inorganic ions, molecules and other transient species have been tabulated.
1,814 citations
TL;DR: In contrast to these extensive studies of heterogeneous acidic catalysts, fewer efforts have been given to the study of heterogenous basic catalysts as mentioned in this paper. But these studies have been continuous and progressed steadily, and they have never been reviewed in the chemical Reviews before.
Abstract: Heterogeneous acid catalysis attracted much attention primarily because heterogeneous acidic catalysts act as catalysts in petroleum refinery and are known as a main catalyst in the cracking process which is the largest process among the industrial chemical processes. In contrast to these extensive studies of heterogeneous acidic catalysts, fewer efforts have been given to the study of heterogeneous basic catalysts. The types of heterogeneous basic catalysts are listed in Table 1. Except for non-oxide catalysts, the basic sites are believed to be surface O atoms. The studies of heterogeneous catalysis have been continuous and progressed steadily. They have never been reviewed in the chemical Reviews before. It is more useful and informative to describe the studies of heterogeneous basic catalysis performed for a long period. In the present article, therefore, the cited papers are not restricted to those published recently, but include those published for the last 25 years. The paper first describes the generation of basic sites before describing methods used in the characterization of basic surfaces. These are indicator methods, temperature programmed desorption (TPD) of CO{sub 2}, UV absorption and luminescence spectroscopies, TPD of H{sub 2}, XPS, IR of CO{sub 2}, IR of pyrrole, and oxygen exchange betweenmore » CO{sub 2} and the surface. The paper then discusses studies on the catalysis by heterogeneous basic catalysts. Some of these reactions are dehydration, dehydrogenation, hydrogenation, amination, alkylation, ring transformation, and reactions of organosilanes. Catalysts discussed are single component metal oxides, zeolites, non-oxide types, and superbasic catalysts. 141 refs.« less
913 citations
TL;DR: The importance of hydrothermal technology in the preparation of nanomaterials has been discussed in detail with reference to the processing of advanced materials for nanotechnology as discussed by the authors, and the role of supercritical water and supercritical fluids is discussed with appropriate examples.
830 citations
TL;DR: In this article, the authors explored the influences of the active metal, support, promoter, preparation methods, calcination temperature, reducing environment, particle size and reactor choice on catalytic activity and carbon deposition for the dry reforming of methane.
Abstract: This review will explore the influences of the active metal, support, promoter, preparation methods, calcination temperature, reducing environment, particle size and reactor choice on catalytic activity and carbon deposition for the dry reforming of methane Bimetallic (Ni−Pt, Ni−Rh, Ni−Ce, Ni−Mo, Ni−Co) and monometallic (Ni) catalysts are preferred for dry reforming compared to noble metals (Rh, Ru and Pt) due to their low-cost Investigation of support materials indicated that ceria−zirconia mixtures, ZrO2 with alkali metals (Mg2+, Ca2+, Y2+) addition, MgO, SBA-15, ZSM-5, CeO2, BaTiO3 and Ca08Sr02TiO3 showed improved catalytic activities and decreased carbon deposition The modifying effects of cerium (Ce), magnesium (Mg) and yttrium (Y) were significant for dry reforming of methane MgO, CeO2 and La2O3 promoters for metal catalysts supported on mesoporous materials had the highest catalyst stability among all the other promoters Preparation methods played an important role in the synthesis of smaller particle size and higher dispersion of active metals Calcination temperature and treatment duration imparted significant changes to the morphology of catalysts as evident by XRD, TPR and XPS Catalyst reduction in different environments (H2, He, H2/He, O2/He, H2−N2 and CH4/O2) indicated that probably the mixture of reducing agents will lead to enhanced catalytic activities Smaller particle size (
593 citations