scholarly journals High catalytic activity over novel Mg–Fe/Ti layered double hydroxides (LDHs) for polycarbonate diols (PCDLs): synthesis, mechanism and application

RSC Advances ◽  
2017 ◽  
Vol 7 (56) ◽  
pp. 35181-35190 ◽  
Author(s):  
Yiliang Wang ◽  
Lijuan Yang ◽  
Xiaohong Peng ◽  
Zhijun Jin
Keyword(s):  
Catalytic Activity ◽  
Layered Double Hydroxides ◽  
Dimethyl Carbonate ◽  
High Catalytic Activity ◽  
Bifunctional Catalysts ◽  
Acid Base ◽  
Synthesis Mechanism ◽  
High Crystallinity ◽  
Co Precipitation ◽  
Double Hydroxides

Novel activated Mg–Fe/Ti LDHs with high crystallinity, used for transesterification between dimethyl carbonate and aliphatic diols as acid–base bifunctional catalysts, were successfully synthesized by co-precipitation.

scholarly journals Synthesis of FePcS–PMA–LDH Cointercalation Composite with Enhanced Visible Light Photo-Fenton Catalytic Activity for BPA Degradation at Circumneutral pH

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1951 ◽  
Author(s):  
Fenglian Huang ◽  
Shiqiang Tian ◽  
Yan Qi ◽  
Erping Li ◽  
Liangliang Zhou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Bisphenol A ◽  
Visible Light ◽  
Layered Double Hydroxides ◽  
Electrochemical Impedance ◽  
Reaction System ◽  
High Catalytic Activity ◽  
Exchange Method ◽  
Double Hydroxides ◽  
Circumneutral Ph

(1) Background: Iron tetrasulfophthalocyanine with a large nonlinear optical coefficient, good stability, and high catalytic activity has aroused the attention of researchers in the field of photo-Fenton reaction. Further improvement of the visible light photo-Fenton catalytic activity under circumneutral pH conditions for their practical application is still of great importance. (2) Methods: In this paper, iron tetrasulfophthalocyanine (FePcS) and phosphomolybdic acid (PMA) cointercalated layered double hydroxides (LDH) were synthesized by the ion-exchange method. All samples were fully characterized by various techniques and the results showed that FePcS and PMA were successfully intercalated in layered double hydroxides and the resulted compound exhibited strong absorption in the visible light region. The cointercalation compound was tested as a heterogeneous catalyst for the visible light photo-Fenton degradation of bisphenol A (BPA) at circumneutral pH. (3) Results: The results showed that the degradation and total organic carbon removal efficiencies of bisphenol A were 100% and 69.2%, respectively. (4) Conclusions: The cyclic voltammetry and electrochemical impedance spectroscopy measurements demonstrated that the main contribution of PMA to the enhanced photo-Fenton activity of FePcS–PMA–LDH comes from the acceleration of electron transfer in the reaction system. Additionally, the possible reaction mechanism in the photo-Fenton system catalyzed by FePcS–PMA–LDH was also proposed.

Controlled synthesis of monodisperse silver nanoparticles supported layered double hydroxide catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (17) ◽  
pp. 13239-13245 ◽  
Author(s):  
D. A. Islam ◽  
D. Borah ◽  
H. Acharya
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Alcohol Oxidation ◽  
High Catalytic Activity ◽  
Controlled Synthesis ◽  
Ag Nps ◽  
Double Hydroxide ◽  
Double Hydroxides

Monodisperse silver nanoparticles supported layered double hydroxides (Ag NPs–LDH) were preferentially deposited on the outer surfaces of pillared LDH offered a high catalytic activity on alcohol oxidation.

scholarly journals Synthesis of core–shell Ce-modified mixed metal oxides derived from P123-templated layered double hydroxides

RSC Advances ◽  
2021 ◽  
Vol 11 (14) ◽  
pp. 8375-8383
Author(s):  
Kaijun Wang ◽  
Qifan Mao ◽  
Weimin Fei ◽  
Lingxin Kong ◽  
Xiaoyan Cao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metal Oxides ◽  
Propylene Glycol ◽  
Methyl Ether ◽  
Layered Double Hydroxides ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Mixed Metal Oxides ◽  
Double Hydroxides ◽  
Glycol Methyl Ether

A shell of P123-templated CeMgAl-LDO was distributed in transverse and longitudinal directions on spheres of SiO2. The composites displayed high catalytic activity in the synthesis of propylene glycol methyl ether.

scholarly journals Fluorescing Layered Double Hydroxides as Tracer Materials for Particle Injection during Subsurface Water Remediation

2020 ◽  
Vol 4 (3) ◽  
pp. 53
Author(s):  
Karen Maria Dietmann ◽  
Tobias Linke ◽  
Markus Reischer ◽  
Vicente Rives
Keyword(s):  
Layered Double Hydroxides ◽  
Chlorinated Solvents ◽  
Cost Effective ◽  
Water Remediation ◽  
Subsurface Water ◽  
Particle Injection ◽  
Global Issue ◽  
Cost Effective Method ◽  
Co Precipitation ◽  
Double Hydroxides

Nowadays, the contamination of groundwater and soils by highly hazardous and toxic chlorinated solvents is a global issue. Over the past years, different remediation strategies have been developed, involving injection of reactive solutions and/or particles. However, a major difficulty is the monitoring of injected particles during the injection and after secondary mobilisation by groundwater flow. This study is focussed on the development of directly traceable particles by combining fluorescein with Layered Double Hydroxides (LDHs). We present here the facile and easily tuneable synthesis of fluorescing LDHs (Fluo-LDH) via co-precipitation under supersaturation conditions. Their ability to mimic particle sizes of previously studied reactive LDHs, which proved to be able to adsorb or degrade chlorinated organic solvents from aqueous solutions, was investigated as well. Tests using a novel Optical Image Profiler (OIP) confirmed that the fluorescent LDHs can be easily detected with this tool. Even LDHs with the lowest amount of fluorescent dye were detectable. Together with the use of an OIP, which is capable of exciting the fluorescent material and collecting real-time pictures, this can provide a new, efficient, and cost-effective method for in situ tracing of injected particles in the subsurface.

scholarly journals Mixed Oxide Layered Double Hydroxide Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4089
Author(s):  
Cristina Modrogan ◽  
Simona Cǎprǎrescu ◽  
Annette Madelene Dǎncilǎ ◽  
Oanamari Daniela Orbuleț ◽  
Eugeniu Vasile ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Layered Double Hydroxides ◽  
Synthetic Wastewater ◽  
Precipitation Method ◽  
Metallic Ions ◽  
Materials Synthesis ◽  
Experimental Conditions ◽  
Edx Analysis ◽  
Co Precipitation ◽  
Double Hydroxides

Magnesium–aluminum (Mg-Al) and magnesium–aluminum–nickel (Mg-Al-Ni) layered double hydroxides (LDHs) were synthesized by the co-precipitation method. The adsorption process of Mn2+ from synthetic wastewater was investigated. Formation of the layered double hydroxides and adsorption of Mn2+ on both Mg-Al and Mg-Ni-Al LDHs were observed by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDX) analysis. XRD patterns for prepared LDHs presented sharp and symmetrical peaks. SEM studies revealed that Mg-Al LDH and Mg-Al-Ni LDH exhibit a non-porous structure. EDX analysis showed that the prepared LDHs present uniformly spread elements. The adsorption equilibrium on these LDHs was investigated at different experimental conditions such as: Shaking time, initial Mn2+ concentration, and temperatures (10 and 20 °C). The parameters were controlled and optimized to remove the Mn2+ from synthetic wastewater. Adsorption isotherms of Mn2+ were fitted by Langmuir and Freundlich models. The obtained results indicated that the isotherm data fitted better into the Freundlich model than the Langmuir model. Adsorption capacity of Mn2+ gradually increased with temperature. The Langmuir constant (KL) value of Mg-Al LDH (0.9529 ± 0.007 L/mg) was higher than Mg-Al-Ni LDH (0.1819 ± 0.004 L/mg), at 20 °C. The final adsorption capacity was higher for Mg-Al LDH (91.85 ± 0.087%) in comparison with Mg-Al-Ni LDH (35.97 ± 0.093%), at 20 °C. It was found that the adsorption kinetics is best described by the pseudo-second-order model. The results indicated that LDHs can be considered as a potential material for adsorption of other metallic ions from wastewater.

scholarly journals Bifunctional acid–base mesoporous silica@aqueous miscible organic-layered double hydroxides

RSC Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 3749-3754 ◽  
Author(s):  
Hongri Suo ◽  
Haohong Duan ◽  
Chunping Chen ◽  
Jean-Charles Buffet ◽  
Dermot O'Hare
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Layered Double Hydroxides ◽  
High Surface ◽  
High Surface Area ◽  
Core Shell ◽  
Acid Base ◽  
Double Hydroxides ◽  
Hierarchical Morphology ◽  
Size And Structure

Core@shell materials which exhibit hierarchical morphology with ultra high surface area and controllable pore size and structure have been synthesised.

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