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.

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.

Thermogravimetric analysis of layered double hydroxides with chloramphenicol and salicylate in the interlayer space

2008 ◽  
Vol 93 (2) ◽  
pp. 373-379 ◽  
Author(s):  
Mihaela Frunza ◽  
Gabriela Lisa ◽  
M. I. Popa ◽  
N. D. Miron ◽  
Denisa Ileana Nistor
Keyword(s):  
Thermogravimetric Analysis ◽  
Layered Double Hydroxides ◽  
Interlayer Space ◽  
Double Hydroxides

scholarly journals Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

2020 ◽  
Vol 3 (6) ◽  
pp. 499-509 ◽  
Author(s):  
Alvaro Seijas‐Da Silva ◽  
Roger Sanchis‐Gual ◽  
Jose A. Carrasco ◽  
Víctor Oestreicher ◽  
Gonzalo Abellán ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Interlayer Space ◽  
Metal Composition ◽  
Double Hydroxides

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 Influence of the Interlayer Space on the Water Oxidation Performance in a Family of Surfactant-Intercalated NiFe-Layered Double Hydroxides

2019 ◽  
Vol 31 (17) ◽  
pp. 6798-6807 ◽  
Author(s):  
Jose A. Carrasco ◽  
Roger Sanchis-Gual ◽  
Alvaro Seijas-Da Silva ◽  
Gonzalo Abellán ◽  
Eugenio Coronado
Keyword(s):  
Layered Double Hydroxides ◽  
Water Oxidation ◽  
Interlayer Space ◽  
Oxidation Performance ◽  
Double Hydroxides

Self-assembled Nanomaterials Type Layered Double Hydroxides Antibiotics Used as Drug Delivery Vectors

2017 ◽  
Vol 68 (11) ◽  
pp. 2542-2545 ◽  
Author(s):  
Letitia Doina Duceac ◽  
Liviu Stafie ◽  
Elena Ariela Banu ◽  
Oana Paduraru ◽  
Gabriela Calin ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Layered Double Hydroxides ◽  
Drug Concentration ◽  
Interlayer Space ◽  
Drug Controlled Release ◽  
Long Time ◽  
Self Assembled ◽  
Double Hydroxides ◽  
Antibacterial Factor

Due to their biocompatibility, nanomaterials type layered double hydroxides (LDHs) development has attracted many researchers attention especially in medical area using them as drug delivery vectors. Their efficiency is due to the drug controlled release from the interlayer space of LDHs matrices. The controlled drug delivery characteristic is due to the reduction of drug concentration variations and maintains the desired level of drug concentration for long time. Furthermore, this action limits adverse effects and reduces the therapy duration, enhancing bactericidal activity and leading to an effective treatment. This work highlights the synthesis and characterization of hybrid structures type LDHs- tobramycin having application as antibacterial factor against Pseudomonas aeruginosa. The obtained self-assembled structures were morphologically characterized in order to point out the drug-interlayered products. Results indicate superior properties of MgAlLDHs and ZnAlLDHs behaving as host for a wide variety of molecules generally and, in our case, for tobramycin as guest.

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