scholarly journals Intercalation Zn/Cr Layered Double Hydroxides with K3[𝛼-PW12O40]nH2O and K4[𝛼-SiW12O40]nH2O as Adsorbent of Rhodamine-B

2020 ◽  
Vol 4 (4) ◽  
pp. 109
Author(s):  
Jeri Ramadhan ◽  
Neza Rahayu Palapa ◽  
Tarmizi Taher ◽  
Risfidian Mohadi ◽  
Aldes Lesbani
Keyword(s):  
Free Energy ◽  
Layered Double Hydroxide ◽  
Rhodamine B ◽  
Adsorption Process ◽  
Isotherm Models ◽  
Ft Ir ◽  
Enthalpy And Entropy ◽  
Double Hydroxide ◽  
Double Hydroxides

Synthesis of Zn-Cr layered double hydroxide intercalated with polyoxometalate K3[𝛼-PW12O40]nH2O and K4[𝛼- SiW12O40]nH2O was conducted successfully. The characterization of layered double hydroxide intercalated was performed using XRD and FT-IR analyses. After that layered double hydroxide intercalated used as an adsorbent of rhodamine B (RhB) dye. The results show Rhodamine-B (RhB) more effective adsorbed using the Zn-Cr adsorbent K3[𝛼-PW12O40]nH2O than using an intercalated adsorbent K4[𝛼-SiW12O40]nH2O because the distance between the layers is smaller. Study of kinetics showed that the adsorption process is more fits with PSO than PFO based on coefficients correlation. The adsorption process described by Langmuir isotherm models for all adsorbent. The value of enthalpy and entropy shows that the adsorption process was endothermic and negative free energy value was indicated that the process was spontaneous.

Synthesis and Characterization of Methyl-Red/Layered Double Hydroxide (LDH) Nanocomposite

2009 ◽  
Vol 79-82 ◽  
pp. 493-496 ◽  
Author(s):  
Jian Qiang Liu ◽  
Xing Cheng Zhang ◽  
Wan Guo Hou ◽  
You Yong Dai ◽  
Hongdi Xiao ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Lamellar Structure ◽  
Guest Molecule ◽  
High Thermal Stability ◽  
Reconstruction Method ◽  
Methyl Red ◽  
Element Analysis ◽  
Ft Ir ◽  
Double Hydroxide

In this paper, the intercalation of methyl-red (MR) into Mg/Al (ratio=2:1) layered double hydroxide (LDH) was carried out using reconstruction method to obtain MRLDH nanocomposite material. Its chemical composition, crystal structure and appearance were characterized by XRD, FT-IR, TEM, TG-DTA and element analysis. It has been found that the MRLDH still keeps the typical lamellar structure, and the guest MR has inserted into the layers of the host LDH. The MRLDH’s disassembly temperature is higher more than 70°C than that of guest molecule MR, so it can be used as a new dye with high thermal stability.

Preparation and Physicochemical Characterization of Magnetic Composite: CuFe2O4 / Layered Double Hydroxide

2014 ◽  
Vol 955-959 ◽  
pp. 47-50
Author(s):  
Dan Chen ◽  
Xiao Long Ma
Keyword(s):  
Layered Double Hydroxide ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Physicochemical Characterization ◽  
Magnetic Composite ◽  
X Ray Diffraction ◽  
Microwave Hydrothermal ◽  
Ft Ir ◽  
Double Hydroxide

We fabricated new magnetic material CuFe2O4/Zn2Cr-LDH by the combination of CuFe2O4 and layered double hydroxide (LDH) through two steps. CuFe2O4 was prepared by sol-gel method with the assistant of citric acid, which was used in synthesis of the composite via microwave hydrothermal method subsequently. The physicochemical properties of the composite was characterized by several techniques, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Vibrating sample magnetometer (VSM) and Thermogravimetry-differential thermal analysis (TG-DTA). The magnetic composite reveals several advantage of LDH structure and spinel ferrite oxide and is potential for the application of heterogeneous catalysis.

scholarly journals Methyl Orange Adsorption by Fe2O3@Co-Al-Layered Double Hydroxide

Proceedings ◽  
2020 ◽  
Vol 41 (1) ◽  
pp. 64
Author(s):  
Edris Jamshidi ◽  
Faranak Manteghi
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Layered Double Hydroxide ◽  
Sodium Acetate ◽  
Adsorption Process ◽  
Magnetic Composite ◽  
Trivalent Metal ◽  
Vis Spectroscopy ◽  
Double Hydroxide ◽  
Double Hydroxides

A magnetic composite consisting of iron oxide and a cobalt–aluminum-layered double hydroxide, Fe2O3@Co-Al-layered double hydroxide was prepared through linking of Fe2O3 to Co-Al layered double hydroxide (LDH) by sodium acetate. Layered double hydroxides are generally described as [M2+1–xM3+x(OH)2] [An–x/n·mH2O], where M2+ and M3+ are divalent and trivalent metal cations, respectively, and A is an n-valent interlayer guest anion. The composite was characterized by XRD, FTIR and UV-Vis. spectroscopy methods. Afterwards, the composite was used for methyl-orange adsorption in aqueous solution. The UV–Vis spectrum indicates that the adsorption process was satisfying. In effect, after several washings of the composite, no decrease of the adsorption capacity was observed.

Physicochemical Characterization of the Magnetic Fe3O4/MO-Intercalated-Layered Double Hydroxide Composite

2013 ◽  
Vol 734-737 ◽  
pp. 2168-2171
Author(s):  
Dan Chen ◽  
Xiao Long Ma ◽  
Yang Li
Keyword(s):  
Layered Double Hydroxide ◽  
Physicochemical Characterization ◽  
Basal Spacing ◽  
X Ray Diffraction ◽  
Exchange Method ◽  
Microwave Hydrothermal ◽  
Ft Ir ◽  
Double Hydroxide ◽  
Ft Ir Spectroscopy

A new magnetic Fe3O4/MO-intercalated-LDH composite has been synthesized by combination of Fe3O4, layered double hydroxide (LDH) and methyl orange (MO). Fe3O4/Zn2CrLDH and Fe3O4/MO-intercalated-LDH were obtained via two-step microwave hydrothermal and anion exchange method. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and vibrating sample magnetometer (VSM) were conducted to characterize the as-prepared samples. The latter exhibited that basal spacing of Zn2Cr-LDH is 1.18 nm. The value of saturation magnetization (Ms) is 20.5 emu/g. In addition, the amounts of adsorbed MO reached 1.54 mmol/g. Therefore, the material shows several advantages for the removal of pollutants.

scholarly journals Removal of Iron(II) Using Intercalated Ca/Al Layered Double Hydroxides with [α-SiW12O40]4-

2019 ◽  
Vol 14 (2) ◽  
pp. 260 ◽  
Author(s):  
Tarmizi Taher ◽  
Mikha Meilinda Christina ◽  
Muhammad Said ◽  
Nurlisa Hidayati ◽  
Ferlinahayati Ferlinahayati ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Layer Structure ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Synthesized Materials

Ca/Al layered double hydroxide (LDH) was successfully synthesized by co-precipitation method at pH 11 under room temperature condition then followed by calcination at 800 oC. The synthesized Ca/Al LDH was further intercalated with Keggin ion [α-SiW12O40]4- in order to prepare the intercalated form of Ca/Al LDH. The synthesized materials were characterized by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) and used as an adsorbent for iron(II) removal from the aqueous medium. The adsorption performance was investigated by studying the kinetics and thermodynamic properties of the adsorption process. The results showed that pristine Ca/Al LDH exhibited diffraction peak at 2θ about 20o which corresponds to the layer structure of the LDH material. For the intercalated Ca/Al LDH, the diffraction observed at 2θ around 30-40o indicated that the [α-SiW12O40]4- was successfully intercalated into the interlayer space of Ca/Al LDH. Furthermore, the intercalated Ca/Al LDH showed higher adsorption capacity toward iron(II) than the pristine form of Ca/Al LDH. Copyright © 2019 BCREC Group. All rights reserved 

Synthesis and Characterization of Methyl-Orange/Layered Double Hydroxide (LDH) Nanocomposite

2011 ◽  
Vol 55-57 ◽  
pp. 753-757 ◽  
Author(s):  
Jian Qiang Liu ◽  
Xing Qi Fu ◽  
Jian Ye Song ◽  
Yun Xu Fu ◽  
Wan Guo Hou
Keyword(s):  
Thermal Stability ◽  
Methyl Orange ◽  
Layered Double Hydroxide ◽  
Guest Molecule ◽  
High Thermal Stability ◽  
Reconstruction Method ◽  
Element Analysis ◽  
Ft Ir ◽  
Double Hydroxide

In this paper, the intercalation of methyl-orange (MO) into Mg/Al (ratio=2:1) layered double hydroxide (LDH) was carried out using reconstruction method to obtain MOLDH nanocomposite material. Its chemical composition, crystal structure, appearance and thermal stability were characterized by XRD, FT-IR, TEM, TG-DTA and element analysis. It has been found that the MOLDH still keeps the typical lamellar structure, and the guest MO has been intercalated into the layers of the host LDH. The MOLDH’s disassembly temperature is higher more than 30°C than that of guest molecule MO, so it can be used as a new dye with high thermal stability.

Synthesis and Characterization of Mg-Al Layered Double Hydroxide

2012 ◽  
Vol 454 ◽  
pp. 101-104 ◽  
Author(s):  
Wan Zhong Yin ◽  
Qi Tan ◽  
Lei Liu ◽  
Xiao Li Li
Keyword(s):  
Layered Double Hydroxide ◽  
Milling Time ◽  
Raw Materials ◽  
Weight Ratio ◽  
Hydroxyl Groups ◽  
Wet Milling ◽  
Ft Ir ◽  
Double Hydroxide ◽  
Partical Size

Mg-Al layered double hydroxide was synthesized by the method of mechanochemistry /crystallization at the dry milling time of 6 h, wet milling time of 2 h, milling speed of 250 r/min, and ball to powder weight ratio of 50 to 1 using brucite, Al(OH)3 and Na2CO3 as the raw materials. Characterizations of the materials were achieved by XRD, TEM, FT-IR and TG-DSC. The results showed that well crystallized Mg-Al LDH with average partical size of 40 nm were synthesized under this condition. Mg-Al LDH was formed with CO32- freely intercalated between the hydroxide host layers. The material generally decomposed via two distinct stages. The first stage at 229.5 °C was attributed to the loss of interlayer water, and the second stage at 407.8°C was due to the loss of hydroxyl groups from the brucite-like layer, as well as of the carbonate irons.

Synthesis and characterization of Mg–Al-layered double hydroxides intercalated with cubane-1,4-dicarboxylate anions

2015 ◽  
Vol 44 (3) ◽  
pp. 988-996 ◽  
Author(s):  
Zolfaghar Rezvani ◽  
Farzad Arjomandi Rad ◽  
Fatemeh Khodam
Keyword(s):  
Dicarboxylic Acid ◽  
Layered Double Hydroxide ◽  
Alkaline Solution ◽  
Layered Double Hydroxides ◽  
Coprecipitation Method ◽  
Synthesis And Characterization ◽  
Nitrate Salts ◽  
Double Hydroxide ◽  
Double Hydroxides

In the present work, Mg2Al-layered double hydroxide (LDH) intercalated with cubane-1,4-dicarboxylate anions was prepared from the reaction of solutions of Mg(ii) and Al(iii) nitrate salts with an alkaline solution of cubane-1,4-dicarboxylic acid by using the coprecipitation method.

Physical - Chemical Issues of Cephalosporin Intercalated Nanoparticles for Life - Threatening Infections Treatment

2001 ◽  
Vol 71 (3) ◽  
pp. 342-349
Author(s):  
Lucian Eva ◽  
Letitia Doina Duceac ◽  
Liviu Stafie ◽  
Constantin Marcu ◽  
Geta Mitrea ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Advanced Characterization ◽  
Generation Cephalosporin ◽  
Fourth Generation ◽  
Exchange Method ◽  
Physico Chemical ◽  
Life Threatening ◽  
Double Hydroxide ◽  
Double Hydroxides

The fourth generation cephalosporin antibacterial agent, cefepime, was loaded into layered double hydroxides for enhancing antibiotic efficiency, reducing side effects, as well as achieving the sustained release property. The intercalation of antibiotic into the inter-gallery of ZnAl-layered double hydroxide (LDH) was carried out using ion exchange method, by this constituting a nano-sized organic-inorganic hybrid material for a controlled release novel formulation. Although cefepime is a broad spectrum antibiotic, it has various adverse effects and a significant degradation rate. Thus, the preparation and physico-chemical characterization of nanomaterials able to intercalate this drug is an important study for medical and pharmaceutical field. The antibiotic inclusion into LDHs nanostructure was confirmed by advanced characterization techniques and the release profile of cefepime was analysed with the respect to pH of the simulated media.

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