Interaction of U(vi) with α-MnO2@layered double hydroxides by combined batch experiments and spectroscopy studies

2020 ◽  
Vol 7 (2) ◽  
pp. 487-497
Author(s):  
Junping Ma ◽  
Chen Wang ◽  
Qiuyu Zhao ◽  
Jianlin Ren ◽  
Zhe Chen ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Environmental Remediation ◽  
Batch Experiments ◽  
Biological Toxicity ◽  
High Concern ◽  
Long Life ◽  
Spectroscopy Studies ◽  
Double Hydroxides

Uranium is of high concern in the field of environmental remediation because of its high fluidity, radioactivity, biological toxicity and long life. Removing U(vi) from wastewater is of great significance to both environment and biology.

Interaction of U(VI) with ternary layered double hydroxides by combined batch experiments and spectroscopy study

2018 ◽  
Vol 338 ◽  
pp. 579-590 ◽  
Author(s):  
Shuang Song ◽  
Ling Yin ◽  
Xiangxue Wang ◽  
Li Liu ◽  
Shuyi Huang ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Spectroscopy Study ◽  
Batch Experiments ◽  
Double Hydroxides

Insight into the adsorption mechanisms of aqueous hexavalent chromium by EDTA intercalated layered double hydroxides: XRD, FTIR, XPS, and zeta potential studies

2019 ◽  
Vol 43 (40) ◽  
pp. 15915-15923 ◽  
Author(s):  
Jing Li ◽  
Liangguo Yan ◽  
Yanting Yang ◽  
Xue Zhang ◽  
Rixin Zhu ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Hexavalent Chromium ◽  
Layered Double Hydroxides ◽  
Batch Experiments ◽  
Adsorption Mechanisms ◽  
Adsorption Performance ◽  
Magnetic Product ◽  
Double Hydroxides ◽  
Insight Into

To understand the possible mechanisms of Cr(vi) adsorption on the surface of modified LDHs, we synthesized EDTA intercalated MgAl-LDH and its magnetic product, and evaluated their adsorption performance for Cr(vi) by batch experiments.

scholarly journals Effect of Chain Length and Functional Group of Organic Anions on the Retention Ability of MgAl- Layered Double Hydroxides for Chlorinated Organic Solvents

2019 ◽  
Vol 3 (4) ◽  
pp. 89 ◽  
Author(s):  
Karen Maria Dietmann ◽  
Tobias Linke ◽  
Raquel Trujillano ◽  
Vicente Rives
Keyword(s):  
Chain Length ◽  
Organic Solvents ◽  
Layered Double Hydroxides ◽  
Functional Group ◽  
Interlayer Space ◽  
Organic Anions ◽  
Batch Experiments ◽  
Swelling Properties ◽  
Chlorinated Organic ◽  
Double Hydroxides

Nowadays, the contamination of groundwater and soils by chlorinated organic solvents is a severe and worldwide problem. Due to their swelling properties, Layered Double Hydroxides (LDHs) are potentially excellent compounds to retain chlorinated organic solvents from aquifers. By intercalating organic anions, the polarity of the interlayer space can be changed from hydrophilic to hydrophobic, enhancing the adsorption of chloro-organic molecules onto the alkyl chains of intercalated organic anions. In this study, organically modified LDHs were synthesized and their efficiency was tested in batch experiments with three different chlorinated organic solvents, namely trichloroethylene, 1,1,2-trichloroethane and trichloromethane (chloroform), to examine the influence of the chain length and the functional group of the intercalated organic anion upon the retention ability of a LDH due to different electronic interactions and different sizes of the interlayer space. All synthesized and used samples were characterized using powder X-ray diffraction, thermal analysis coupled with mass spectrometry and Fourier-transform infrared spectroscopy; freshly synthesized materials were additionally analyzed regarding their particle size distribution and specific surface area. Results of the batch experiments showed that only LDHs with intercalated long-chain organic anions could be efficient adsorbents for the removal of chlorinated organic solvents from contaminated water. A selective efficiency towards 1,1,2-trichloroethane and trichloromethane can be proposed for these reactants.

One-pot in situ synthesized TiO 2 /layered double hydroxides (LDHs) composites toward environmental remediation

2014 ◽  
Vol 114 ◽  
pp. 111-114 ◽  
Author(s):  
Lu Shao ◽  
Yuhuan Yao ◽  
Shuai Quan ◽  
Huige Wei ◽  
Rongguo Wang ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Environmental Remediation ◽  
One Pot ◽  
Double Hydroxides

scholarly journals Layered Double Hydroxides with Intercalated Permanganate and Peroxydisulphate Anions for Oxidative Removal of Chlorinated Organic Solvents Contaminated Water

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 462 ◽  
Author(s):  
Karen Maria Dietmann ◽  
Tobias Linke ◽  
Miguel del Nogal Sánchez ◽  
José Luis Pérez Pavón ◽  
Vicente Rives
Keyword(s):  
Organic Solvents ◽  
Layered Double Hydroxides ◽  
Batch Experiments ◽  
X Ray Diffraction ◽  
Oxidation Processes ◽  
Remediation Strategies ◽  
Chlorinated Organic ◽  
Hazardous Pollutants ◽  
Double Hydroxides

The contamination by chlorinated organic solvents is a worldwide problem as they can deeply penetrate aquifers, accumulating in the sub-surface as lenses of highly hazardous pollutants. In recent years, so called in situ oxidation processes have been developed to remediate chlorinated organic solvents from groundwater and soil by injecting solutions of oxidising agents such as permanganate or peroxydisulphate. We here present modified layered double hydroxides (LDHs) with intercalated oxidising agents that might serve as new reactants for these remediation strategies. LDHs might serve as support and stabiliser materials for selected oxidising agents during injection, as the uncontrolled reaction and consumption might be inhibited, and guarantee that the selected oxidants persist in the subsurface after injection. In this study, LDHs with hydrotalcite- and hydrocalumite-like structures intercalated with permanganate and peroxydisulphate anions were synthesised and their efficiency was tested in batch experiments using trichloroethene or 1,1,2-trichloroethane as the target contaminants. All samples were characterised using powder X-ray diffraction, thermal analysis coupled with mass spectrometry to directly analyse evolving gases, and Fourier-transform infrared spectroscopy. Additionally, particle size distribution measurements were carried out on the synthesised materials. Results of the batch experiments confirmed the hypothesis that oxidising agents keep their properties after intercalation. Permanganate intercalated LDHs proved to be most efficient at degrading trichloroethene while peroxydisulphate intercalated Ca,Al-LDHs were the most promising studied reactants degrading 1,1,2-trichloroethane. The detection of dichloroethene as well as the transformation of the studied reactants into new LDH phases confirmed the successful degradation of the target contaminant by oxidation processes generated from the intercalated oxidising agent.

Layered Double Hydroxides Applications in the High-Performance Magnetic Nanomaterials

2020 ◽  
Vol 19 (05) ◽  
pp. 1950039
Author(s):  
Abdullah Ahmed Ali Ahmed
Keyword(s):  
Data Storage ◽  
Layered Double Hydroxides ◽  
Environmental Remediation ◽  
High Performance ◽  
Magnetic Nanostructures ◽  
Chemical Properties ◽  
Magnetic Nanomaterials ◽  
High Dispersion ◽  
Wide Range ◽  
Double Hydroxides

Layered double hydroxides (LDHs), which is related to magnetic nanomaterials’ have promising applications due to their unique structural and chemical properties. The easy tunability of cationic metals without changing the LDH structure as well as anion exchange features of LDH interlayer make them potential applications in supercapacitors, batteries, catalysis, water splitting, etc. Moreover, due to the high dispersion of active compounds in the matrix of LDH layers, LDHs have been used to construct various nanostructures such as nanoparticles, 2D monolayer nanosheets and 3D hierarchical’ which are valued in wide nanotechnological applications. Magnetic nanomaterials are an important research area because they have been applied to a wide range of disciplines such as biotechnology, data storage, magnetic fluids, magnetic resonance imaging, environmental remediation and catalysis. LDHs as starting materials including Ni, Fe or/and Co, can be used as magnetic nanomaterials. The combination between LDHs and magnetic nanostructures has improved the magnetic properties of those materials, hence can be used in more applications.

scholarly journals Efficient solar heterogeneous photocatalytic degradation of metronidazole using heterojunction semiconductors hybrid nanocomposite, layered double hydroxides

2020 ◽  
Vol 82 (12) ◽  
pp. 2837-2846
Author(s):  
Farid Aoudjit ◽  
Fouzia Touahra ◽  
Lamine Aoudjit ◽  
Ouiza Cherifi ◽  
Djamilla Halliche
Keyword(s):  
Photocatalytic Degradation ◽  
Layered Double Hydroxides ◽  
Environmental Remediation ◽  
Solar Irradiation ◽  
Precipitation Method ◽  
Catalyst Loading ◽  
X Ray ◽  
Constant Ph ◽  
Co Precipitation ◽  
Double Hydroxides

Abstract This study focuses on the synthesis of various nanocomposites with heterojunction structures, MgAl-LDH (LDH = layered double hydroxides) hybrid with semiconductor such as MoO3 and CuO. These solids were synthesized by co-precipitation method at constant pH and have been characterized extensively using atomic absorption spectroscopy (AAS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and transmission electron microscopy-energy dispersive X-ray (TEM-EDX) methods. The catalytic activity of nanocomposites was tested in the photocatalytic degradation under solar irradiation of emerging pollutants as the pharmaceutical metronidazole (MNZ). The experimental parameters, including initial MNZ concentration, the nature of oxide incorporate in the photocatalyst, catalyst loading were explored. All the synthesized samples showed high photocatalytic performances; the highest photocatalysis efficiency was achieved with the photocatalyst dose 1.5 g/L and initial MNZ concentration of 10 mg/L at neutral pH. The photocatalytic experimental results were fitted very well to the Langmuir-Hinshelwood model. From the obtained results the calcined LDH/semiconductors could be efficient for the photocatalytic process under solar irradiation of pharmaceuticals and may contribute in environmental remediation.

scholarly journals Antimonate Removal from Polluted Mining Water by Calcined Layered Double Hydroxides

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 410 ◽  
Author(s):  
Elisabetta Dore ◽  
Franco Frau ◽  
Rosa Cidu
Keyword(s):  
Layered Double Hydroxides ◽  
Mine Drainage ◽  
Batch Experiments ◽  
Competition Effect ◽  
Calcined Hydrotalcite ◽  
Complex Chemical Composition ◽  
Mining Water ◽  
Double Hydroxides ◽  
Polluted Waters ◽  
Very High

Calcined layered double hydroxides (LDHs) can be used to remove Sb(V), in the Sb(OH)6− form, from aqueous solutions. Sorption batch experiments showed that the mixed MgAlFe oxides, obtained from calcined hydrotalcite-like compound (3HT-cal), removed Sb(OH)6− through the formation of a non-LDH brandholzite-like compound, whereas the mixed ZnAl oxides, resulting from calcined zaccagnaite-like compound (2ZC-cal), trapped Sb(OH)6− in the interlayer during the formation of a Sb(V)-bearing LDH (the zincalstibite-like compound). The competition effect of coexistent anions on Sb(OH)6− removal was HAsO42− >> HCO3− ≥ SO42− for 2ZC-cal and HAsO42− >> HCO3− >> SO42− for 3HT-cal. Considering the importance of assessing the practical use of calcined LDHs, batch experiments were also carried out with a slag drainage affected by serious Sb(V) pollution (Sb = 9900 μg/L) sampled at the abandoned Su Suergiu mine (Sardinia, Italy). Results showed that, due to the complex chemical composition of the slag drainage, dissolved Sb(OH)6− was removed by intercalation in the interlayer of carbonate LDHs rather than through the formation of brandholzite-like or zincalstibite-like compounds. Both 2ZC-cal and 3HT-cal efficiently removed very high percentages (up to 90–99%) of Sb(V) from the Su Suergiu mine drainage, and thus can have a potential application for real polluted waters.

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