scholarly journals Adsorption of Heavy Metals on Layered Double Hydroxides (LDHs) Intercalated with Chelating Agents

2019 ◽  
Author(s):  
Naoki Kano ◽  
Shuang Zhang
Keyword(s):  
Heavy Metals ◽  
Layered Double Hydroxides ◽  
Chelating Agents ◽  
Double Hydroxides

scholarly journals Layered Double Hydroxides as Effective Adsorbents for U(VI) and Toxic Heavy Metals Removal from Aqueous Media

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
G. N. Pshinko
Keyword(s):  
Heavy Metals ◽  
Layered Double Hydroxides ◽  
Chelating Agents ◽  
Ethylenediaminetetraacetic Acid ◽  
Aqueous Media ◽  
Water Soluble ◽  
Toxic Heavy Metals ◽  
Metals Removal ◽  
The Stability ◽  
Double Hydroxides

Capacities of different synthesized Zn,Al-hydrotalcite-like adsorbents, including the initial carbonate [Zn4Al2(OH)12]·CO3·8H2O and its forms intercalated with chelating agents (ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), and hexamethylenediaminetetraacetic acid (HMDTA)) and heat-treated form Zn4Al2O7, to adsorb uranium(VI) and ions of toxic heavy metals have been compared. Metal sorption capacities of hydrotalcite-like adsorbents have been shown to correlate with the stability of their complexes with the mentioned chelating agents in a solution. The synthesized layered double hydroxides (LDHs) containing chelating agents in the interlayer space are rather efficient for sorption purification of aqueous media free from U(VI) irrespective of its forms of natural abundance (including water-soluble bi- and tricarbonate forms) and from heavy metal ions. [Zn4Al2(OH)12]·EDTA·nH2O is recommended for practical application as one of the most efficient and inexpensive synthetic adsorbents designed for recovery of both cationic and particularly important anionic forms of U(VI) and other heavy metals from aqueous media. Carbonate forms of LDHs turned out to be most efficient for recovery of Cu(II) from aqueous media withpH0≥7owing to precipitation of Cu(II) basic carbonates and Cu(II) hydroxides. Chromate ions are efficiently adsorbed from water only by calcinated forms of LDHs.

Removal and magnetic recovery of heavy metals and pesticides from soil by layered double hydroxides modified biotite

2021 ◽  
pp. 134113
Author(s):  
Hanhan Huan ◽  
Caifeng Xia ◽  
Derui Liang ◽  
Yuan Xie ◽  
Fanping Kong ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Layered Double Hydroxides ◽  
Magnetic Recovery ◽  
Double Hydroxides

Removal of heavy metals from simulated wastewater by in situ formation of layered double hydroxides

2016 ◽  
Vol 306 ◽  
pp. 1035-1040 ◽  
Author(s):  
Francisco R. Peligro ◽  
Ivana Pavlovic ◽  
Ricardo Rojas ◽  
Cristobalina Barriga
Keyword(s):  
Heavy Metals ◽  
Layered Double Hydroxides ◽  
Removal Of Heavy Metals ◽  
Simulated Wastewater ◽  
In Situ Formation ◽  
Double Hydroxides

Simultaneous adsorption of trace sulfamethoxazole and hexavalent chromium by biochar/MgAl layered double hydroxide composites

2019 ◽  
Vol 16 (1) ◽  
pp. 68 ◽  
Author(s):  
Guowan Li ◽  
Zhujian Huang ◽  
Chengyu Chen ◽  
Hongcan Cui ◽  
Yijuan Su ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Human Health ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Metal Species ◽  
Simultaneous Removal ◽  
Simultaneous Adsorption ◽  
Potential Risks ◽  
Double Hydroxide ◽  
Double Hydroxides

Environmental contextWater contamination by antibiotics and heavy metals entails potential risks to both the environment and human health. Composite materials based on MgAl-layered double hydroxides and biochar simultaneously adsorbed the toxic sulfamethoxazole and CrVI metal species. These findings indicate that biochar/metal hydroxide composites could be valuable adsorbents for the simultaneous removal of trace antibiotics and metals from water. AbstractWater contamination by antibiotics and heavy metals has drawn wide attention because of the potential risks it poses to both the environment and human health. In this study, a series of adsorbents was successfully synthesised based on MgAl-layered double hydroxides (LDHs) and biochar (BC) derived from Pennisetum sinese Roxb. The batch adsorption experiment results showed that the obtained composites could effectively adsorb trace sulfamethoxazole (SMX) and CrVIsimultaneously. The simultaneous adsorption of trace SMX and CrVI are well described by the pseudo-second-order kinetics and Freundlich isotherm models. Characterisation of the composites after adsorption showed that the composites adsorbed SMX mainly by π-π bonds, hydrophobic interactions and hydrogen bonds. Electrostatic interaction, anion exchange, intraparticle diffusion and hydrogen bonding are the main mechanisms for CrVI adsorption onto the composites. This study indicates that the biochar/MgAl layered double hydroxide composites are promising adsorbents for the simultaneous removal of trace antibiotics and CrVI.

A novel luminescence probe based on layered double hydroxides loaded with quantum dots for simultaneous detection of heavy metal ions in water

2017 ◽  
Vol 5 (20) ◽  
pp. 5024-5030 ◽  
Author(s):  
Jieyuan Liu ◽  
Guocheng Lv ◽  
Wenlong Gu ◽  
Zhaohui Li ◽  
Aiwei Tang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Quantum Dots ◽  
Layered Double Hydroxides ◽  
Luminescence Intensity ◽  
Heavy Metal Ions ◽  
Simultaneous Detection ◽  
Real Water Samples ◽  
Remarkable Improvement ◽  
Double Hydroxides

A remarkable improvement in luminescence intensity was achieved by immobilizing quantum dots on the surface of layered double hydroxides, for the detection of heavy metals in real water samples.

Retention of heavy metals on layered double hydroxides thin films deposited by pulsed laser deposition

2014 ◽  
Vol 302 ◽  
pp. 99-104 ◽  
Author(s):  
A. Vlad ◽  
R. Birjega ◽  
A. Matei ◽  
C. Luculescu ◽  
B. Mitu ◽  
...  
Keyword(s):  
Thin Films ◽  
Heavy Metals ◽  
Pulsed Laser Deposition ◽  
Layered Double Hydroxides ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Double Hydroxides
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