Promoting the Chloride Ions Uptake by ZnCo-Cl Layered Double Hydroxide Electrodes towards the Enhanced Capacitive Deionization

2021 ◽  
Author(s):  
Zehao Zhang ◽  
Haibo Li
Keyword(s):  
Layered Double Hydroxide ◽  
Chloride Ions ◽  
Capacitive Deionization ◽  
Removal Capacity ◽  
Double Hydroxide ◽  
Research Domain

Hybrid capacitive deionization (HCDI) has gained a lot attentions in desalination research domain due to the remarkable salt removal capacity. In this work, the ZnCo-Cl layered double hydroxide (LDH) has...

Calcined MgAl-Layered Double Hydroxide/Graphene Hybrids for Capacitive Deionization

2018 ◽  
Vol 57 (18) ◽  
pp. 6417-6425 ◽  
Author(s):  
Qidi Ren ◽  
Gang Wang ◽  
Tingting Wu ◽  
Xin He ◽  
Jianren Wang ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Capacitive Deionization ◽  
Double Hydroxide

scholarly journals Use of ZnAl-Layered Double Hydroxide (LDH) to Extend the Service Life of Reinforced Concrete

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1769 ◽  
Author(s):  
Celestino Gomes ◽  
Zahid Mir ◽  
Rui Sampaio ◽  
Alexandre Bastos ◽  
João Tedim ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Layered Double Hydroxide ◽  
External Solution ◽  
Chloride Ions ◽  
Nacl Solution ◽  
The Stability ◽  
Ph Range ◽  
Double Hydroxide ◽  
Corrosion Of Steel ◽  
Steel Rebars

This work investigated the use of ZnAl-layered double hydroxide (LDH) intercalated with nitrate or nitrite ions for controlling the corrosion of steel in reinforced concrete. The work started by analyzing the stability of the powder in the 1–14 pH range and the capacity for capturing chloride ions in aqueous solutions of different pH. The effect of the ZnAl-LDH on the corrosion of steel was studied in aqueous 0.05 M NaCl solution and in mortars immersed in 3.5% NaCl. It was found that the LDH powders dissolved partially at pH > 12. The LDH was able to capture chloride ions from the external solution, but the process was pH-dependent and stopped at high pH due to the partial dissolution of LDH and the preferential exchange of OH– ions. These results seemed to imply that ZnAl-LDH would not work in the alkaline environment inside the concrete. Nonetheless, preliminary results with mortars containing ZnAl-LDH showed lower penetration of chloride ions and higher corrosion resistance of the steel rebars.

Mg/Al layered double hydroxide for bacteriophage removal in aqueous solution

2012 ◽  
Vol 66 (4) ◽  
pp. 761-767 ◽  
Author(s):  
Jae-Hyun Kim ◽  
Jeong-Ann Park ◽  
Song-Bae Kim
Keyword(s):  
Layered Double Hydroxide ◽  
Column Experiments ◽  
Powder Form ◽  
Experimental Conditions ◽  
Virus Removal ◽  
Removal Capacity ◽  
Batch Tests ◽  
Bacteriophage Ms2 ◽  
Coated Sand ◽  
Double Hydroxide

The objective of this study was to investigate the removal of bacteriophages in Mg/Al layered double hydroxide (LDH). Batch experiments were performed with bacteriophage MS2 in a powder form of Mg/Al LDH under various LDH doses. Column experiments were also performed under flow-through condition with bacteriophages MS2 and phiX174 in Mg/Al LDH immobilized on sand surfaces. Batch tests demonstrated that the powder form of Mg/Al LDH was effective in removing MS2 with the removal capacity of 2.2 × 108 plaque forming unit (pfu)/g under the given experimental conditions (LDH dose = 2 g/L; initial MS2 concentration = 4.61 × 105 pfu/mL). Column experiments showed that the log removal of phiX174 was 4.40 in columns containing 100% Mg/Al LDH-coated sand while it was 0.05 in 100% quartz sand. These findings indicated that Mg/Al LDH-coated sand was effective in removing bacteriophages compared with sand. A more than 4 log removal (=5.44) of MS2 was achieved in 100% Mg/Al LDH-coated sand. This study demonstrates the potential application of Mg/Al LDH for virus removal in water treatment.

Preparation of magnetic alginate–layered double hydroxide composite adsorbents and removal of Cr(VI) from aqueous solution

2013 ◽  
Vol 13 (3) ◽  
pp. 846-853 ◽  
Author(s):  
Chang-Gu Lee ◽  
Jeong-Ann Park ◽  
In Lee ◽  
Jin-Kyu Kang ◽  
Seo-Young Yoon ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Layered Double Hydroxide ◽  
Minor Role ◽  
Solution Ph ◽  
Magnetic Composites ◽  
Magnetic Iron Oxide ◽  
Removal Capacity ◽  
Composite Adsorbents ◽  
Double Hydroxide

The aim of this study was to investigate the removal of Cr(VI) from aqueous solution using magnetic alginate–layered double hydroxide (LDH) composites. Magnetic iron oxide and calcined Mg-Al LDH powders were synthesized in the laboratory. The magnetic composites were prepared through immobilization of synthetic magnetic iron oxide and calcined Mg-Al LDH powders into an alginate matrix. The magnetic composites had a particle size of 1.5 ± 0.1 mm and showed magnetic properties under an external magnetic field. Results demonstrated that the magnetic composites were effective in the removal of Cr(VI). In the magnetic composites, calcined Mg-Al LDH played a major role in the sorption of Cr(VI), whereas magnetic iron oxide provided the magnetic property along with a minor role in Cr(VI) sorption. Kinetic tests showed that Cr(VI) sorption to the magnetic composites reached equilibrium at 24 h. The maximum Cr(VI) removal capacity was 11.15 mg/g. Results also indicated that Cr(VI) removal was not sensitive to solution pH between 4.1 and 9.5. This study demonstrated the potential applications of magnetic alginate–LDH composites for chromate removal from aqueous solution in combination with magnetic separation.

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