scholarly journals Toxicity of Zn-Fe Layered Double Hydroxide to Different Organisms in the Aquatic Environment

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 395
Author(s):  
Olga Koba-Ucun ◽  
Tuğba Ölmez Hanci ◽  
Idil Arslan-Alaton ◽  
Samira Arefi-Oskoui ◽  
Alireza Khataee ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Aquatic Environment ◽  
Vibrio Fischeri ◽  
Test Organism ◽  
Nitrogen Adsorption ◽  
Structural Features ◽  
Trophic Levels ◽  
Pseudokirchneriella Subcapitata ◽  
Precipitation Method ◽  
Double Hydroxide

The application of layered double hydroxide (LDH) nanomaterials as catalysts has attracted great interest due to their unique structural features. It also triggered the need to study their fate and behavior in the aquatic environment. In the present study, Zn-Fe nanolayered double hydroxides (Zn-Fe LDHs) were synthesized using a co-precipitation method and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption-desorption analyses. The toxicity of the home-made Zn-Fe LDHs catalyst was examined by employing a variety of aquatic organisms from different trophic levels, namely the marine photobacterium Vibrio fischeri, the freshwater microalga Pseudokirchneriella subcapitata, the freshwater crustacean Daphnia magna, and the duckweed Spirodela polyrhiza. From the experimental results, it was evident that the acute toxicity of the catalyst depended on the exposure time and type of selected test organism. Zn-Fe LDHs toxicity was also affected by its physical state in suspension, chemical composition, as well as interaction with the bioassay test medium.

An elegant synthesis of chitosan grafted hydrotalcite nano-bio composite material and its effective catalysis for solvent-free synthesis of jasminaldehyde

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 94562-94570 ◽  
Author(s):  
Jacky H. Adwani ◽  
Noor-ul H. Khan ◽  
Ram S. Shukla
Keyword(s):  
Composite Material ◽  
Layered Double Hydroxide ◽  
Solvent Free ◽  
Precipitation Method ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Solvent Free Synthesis

A novel nano-bio composite of chitosan and a layered double hydroxide elegantly synthesized by a co-precipitation method had effectively and selectively catalysed the jasminaldehyde synthesis.

scholarly journals Physicochemical Study of 3,4-Dichlorophenoxyacetic Acid Intercalated into Hydrotalcite-Like Compound by Ion Exchanged Method

2016 ◽  
Vol 846 ◽  
pp. 440-447
Author(s):  
Sheikh Ahmad Izaddin Sheikh Mohd Ghazali ◽  
Siti Halimah Sarijo ◽  
Mohd Zobir Hussein
Keyword(s):  
Surface Area ◽  
Anion Exchange ◽  
Layered Double Hydroxide ◽  
Nitrogen Adsorption ◽  
Basal Spacing ◽  
Dichlorophenoxyacetic Acid ◽  
Exchange Method ◽  
Type Iv ◽  
Double Hydroxide ◽  
Adsorption Desorption

The intercalation of herbicide, 3,4-dicholorophenoxyacetic acid (3,4D), into zinc-aluminium-layered double hydroxide (LDH) for the formation of a new nanocomposite ZADX, was accomplished via anion exchange method. Due to the intercalation of 3,4D with LDH interlayer domain, basal spacing expanded from 8.9Å in the ZAL to 17.7-19.0 Å in the ZADX. The percentage loading of 3,4D in the ZADX is 51.4 % (w/w). The FTIR spectra of the nanocomposite shows resemblance peaks of the 3,4D and Zn-Al-layered double hydroxide indicating the inclusion of 3,4D into the layered double hydroxide. Surface area of the resulting nanocomposite increased from 1.3 to 7.14 m2g-1 with the nitrogen adsorption-desorption of type IV.

scholarly journals Structural Stability of Ni/Al Layered Double Hydroxide Supported on Graphite and Biochar Toward Adorption of Congo Red

2021 ◽  
Vol 6 (2) ◽  
pp. 85-95
Author(s):  
Patimah Mega Syah Bahar Nur Siregar ◽  
Neza Rahayu Palapa ◽  
Alfan Wijaya ◽  
Erni Salasia Fitri ◽  
Aldes Lesbani
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Layered Double Hydroxide ◽  
Congo Red ◽  
High Performance ◽  
Precipitation Method ◽  
First Order ◽  
Xrd Diffraction ◽  
Co Precipitation ◽  
Double Hydroxide

In this research, Ni/Al layered double hydroxide (LDH) was modified by using co-precipitation method to generate Ni/Al-graphite (Ni/Al-GF) and Ni/Al-biochar (Ni/Al-BC). The adsorbents were applied to remove Congo Red from aqueous solution. The obtained samples were characterized by using XRD, FTIR, BET and TG-DTA. The XRD diffraction pattern of Ni/Al LDH, Ni/Al-GF, and Ni/Al-BC presented the formation of composite with decreasing crystallinity. The surface area modified LDHs was higher than the pristine materials, which was obtained 15.106 m2/g, 21.595 m2/g and 438.942 m2/g for Ni/Al-LDH, Ni/Al-GF, Ni/Al-BC respectively. The adsorption of Congo Red on the materials was tested at diferent parameters and the results exhibited that Congo Red adsorption on LDHs were pseudo-first-order (PFO) kinetic, spontaneous, endothermic and followed Langmuir model. The adsorbents removed Congo Red by high performance stability with adsorption capacity was 116.297 mg/g for Ni/Al-GF and 312.500 mg/g for Ni/Al-BC. These adsorption capacity was higher than the pristine LDH (61.728 mg/g). The regeneration process which carried out for five cycles showed that Ni/Al-GF and Ni/Al-BC have stable structures as reuse adsorbents for Congo Red from aqueous solution.

scholarly journals Synthesis and Cytotoxicity Study of Magnetite Nanoparticles Coated with Polyethylene Glycol and Sorafenib–Zinc/Aluminium Layered Double Hydroxide

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2716
Author(s):  
Mona Ebadi ◽  
Kalaivani Buskaran ◽  
Saifullah Bullo ◽  
Mohd Zobir Hussein ◽  
Sharida Fakurazi ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Polyethylene Glycol ◽  
Layered Double Hydroxide ◽  
Average Particle Size ◽  
Superparamagnetic Iron Oxide ◽  
Precipitation Method ◽  
Average Particle ◽  
Order Kinetic ◽  
Number Of Patients ◽  
Double Hydroxide

In the last two decades, the development of novel approaches for cancer treatment has attracted intense attention due to the growing number of patients and the inefficiency of the available current conventional treatments. In this study, superparamagnetic iron oxide nanoparticles (SPIONs) were synthesized by the co-precipitation method in an alkaline medium. Then the nanoparticles were chemically modified by coating them with polyethylene glycol (PEG) and sorafenib (SO)–zinc/aluminum layered double hydroxide (ZLDH) to improve their biocompatibility. The SPIONs and their coated and drug-loaded nanoparticles, M-PEG–SO–ZLDH are of the crystalline phase with the presence of C, O, Al, Fe, Cl, Zn in the latter, indicating the presence of the coating layers on the surface of the SPIONs. The superparamagnetic properties of the bare SPIONs were found to be reduced but retained in its coated drug delivery nanoparticles, M-PEG–SO–ZLDH. The latter has an average particle size of 16 nm and the release of the drug from it was found to be governed by the pseudo-second-order kinetic. The cytotoxicity and biocompatibility evaluation of the drug-loaded magnetic nanoparticles using 3T3 and HepG2 cells using the diphenyltetrazolium bromide (MTT) assays shows that the synthesized nanoparticles were less toxic than the pure drug. This preliminary study indicates that the prepared nanoparticles are suitable to be used for the drug delivery system.

Fabrication of TiO2@ZnAl-layered double hydroxide based anode material for dye-sensitized solar cell

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10912-10918 ◽  
Author(s):  
Leila Jafari Foruzin ◽  
Zolfaghar Rezvani ◽  
Kamellia Nejati
Keyword(s):  
Solar Cell ◽  
Anode Material ◽  
Layered Double Hydroxide ◽  
Dye Sensitized Solar Cell ◽  
Precipitation Method ◽  
Dye Sensitized ◽  
Co Precipitation ◽  
Double Hydroxide

A TiO2@ZnAl-layered double hydroxide nanocomposite was prepared by the co-precipitation method; then, the product was calcined in order to obtain the TiO2@MMO nanocomposite, and use as anode material in dye-sensitized solar cell (DSSC).

scholarly journals Oxidation of Cysteinate Anions Immobilized in the Interlamellar Space of CaAl-Layered Double Hydroxide

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1202
Author(s):  
Zita Timár ◽  
Truong Ngoc Hung ◽  
Cora Pravda ◽  
Zoltán Kónya ◽  
Ákos Kukovecz ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Room Temperature ◽  
Precipitation Method ◽  
Confined Space ◽  
Oxidation Reactions ◽  
Sulfenic Acid ◽  
X Ray ◽  
Mild Conditions ◽  
Co Precipitation ◽  
Double Hydroxide

L-Cysteinate-intercalated CaAl-layered double hydroxide (LDH) was prepared by the co-precipitation method producing highly crystalline hydrocalumite phase with a well-pillared interlayer gallery. The obtained materials were characterized by X-ray diffractometry, IR as well as Raman spectroscopies. By performing interlamellar oxidation reactions with peracetic acid as oxidant, oxidation of cysteinate to cystinate in aqueous and cysteinate sulfenic acid in acetonic suspensions occurred. The oxidations could be performed under mild conditions, at room temperature, under neutral pH and in air. It has been shown that the transformation pathways are due to the presence of the layered structure, that is, the confined space of the LDH behaved as molecular reactor.

scholarly journals High Reusability of NiAl LDH/Biochar Composite in the Removal Methylene Blue from Aqueous Solution

2021 ◽  
Vol 21 (2) ◽  
pp. 421
Author(s):  
Aldes Lesbani ◽  
Neza Rahayu Palapa ◽  
Rabelia Juladika Sayeri ◽  
Tarmizi Taher ◽  
Nurlisa Hidayati
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Layered Double Hydroxide ◽  
Physical Adsorption ◽  
Nitrogen Adsorption ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Composite Formation ◽  
Adsorption Processes ◽  
Double Hydroxide

Ni/Al layered double hydroxide was used as a starting material for composite formation with biochar as a matrix. The materials were characterized using X-ray, FTIR, nitrogen adsorption-desorption, thermal, and morphology analyses. The NiAl LDH/Biochar material is then used as an adsorbent of methylene blue from an aqueous solution. The factor that was influencing adsorption such as pH, time, methylene blue concentration, and temperature adsorption was studied systematically. The regeneration of adsorbent was performed to know the stability of NiAl LDH/Biochar under several cycle adsorption processes. The results showed that NiAl LDH/Biochar has a specific diffraction peak at 11.63° and 22.30°. NiAl LDH/Biochar has more than ten-fold surface area properties (438,942 m2/g) than biochar (50.936 m2/g), and Ni/Al layered double hydroxide (92.682 m2/g). The methylene blue adsorption on NiAl LDH/Biochar follows a pseudo-second-order kinetic adsorption model and classify as physical adsorption. The high reusability properties were found for NiAl LDH/Biochar, which was largely different from biochar and Ni/Al layered double hydroxide.

scholarly journals A Facile Synthesis of NiFe-Layered Double Hydroxide and Mixed Metal Oxide with Excellent Microwave Absorption Properties

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 5046
Author(s):  
Yi Lu ◽  
Pingan Yang ◽  
Yanhong Li ◽  
Dandan Wen ◽  
Jiasai Luo ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Metal Oxide ◽  
Layered Double Hydroxide ◽  
Precipitation Method ◽  
Mixed Metal Oxide ◽  
Electromagnetic Wave Absorption ◽  
Mixed Metal ◽  
Wave Absorption ◽  
Microwave Absorbing ◽  
Double Hydroxide

Microwave-absorbing materials have attracted increased research interest in recent years because of their core roles in the fields of electromagnetic (EM) pollution precaution and information security. In this paper, microwave-absorbing material NiFe-layered double hydroxide (NiFe-LDH) was synthesized by a simple co-precipitation method and calcined for the fabrication of NiFe-mixed metal oxide (NiFe-MMO). The phase structure and micromorphology of the NiFe-LDH and NiFe-MMO were analyzed, and their microwave-absorbing properties were investigated with a vector network analyzer in 2–18 GHz. Both NiFe-LDH and NiFe-MMO possessed abundant interfaces and a low dielectric constant, which were beneficial to electromagnetic wave absorption, owing to the synergistic effect of multi-relaxation and impedance matching. The optimum reflection loss (RL) of NiFe-LDH and NiFe-MMO was −58.8 dB and −64.4 dB, respectively, with the thickness of 4.0 mm in the C band. This work demonstrates that LDH-based materials have a potential application in electromagnetic wave absorption.

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