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.

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...

scholarly journals Determination of Iodate in Food, Environmental, and Biological Samples after Solid-Phase Extraction with Ni-Al-Zr Ternary Layered Double Hydroxide as a Nanosorbent

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Hossein Abdolmohammad-Zadeh ◽  
Keyvan Tavarid ◽  
Zeynab Talleb
Keyword(s):  
Solid Phase Extraction ◽  
Layered Double Hydroxide ◽  
Biological Samples ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Calibration Graph ◽  
Phase Extraction ◽  
Experimental Conditions ◽  
Environmental And Biological Samples ◽  
Double Hydroxide

Nanostructured nickel-aluminum-zirconium ternary layered double hydroxide was successfully applied as a solid-phase extraction sorbent for the separation and pre-concentration of trace levels of iodate in food, environmental and biological samples. An indirect method was used for monitoring of the extracted iodate ions. The method is based on the reaction of the iodate with iodide in acidic solution to produce iodine, which can be spectrophotometrically monitored at 352 nm. The absorbance is directly proportional to the concentration of iodate in the sample. The effect of several parameters such as pH, sample flow rate, amount of nanosorbent, elution conditions, sample volume, and coexisting ions on the recovery was investigated. In the optimum experimental conditions, the limit of detection (3s) and enrichment factor were 0.12 μg mL−1and 20, respectively. The calibration graph using the preconcentration system was linear in the range of 0.2–2.8 μg mL−1with a correlation coefficient of 0.998. In order to validate the presented method, a certified reference material, NIST SRM 1549, was also analyzed.

scholarly journals Layered Double Hydroxide Nanoparticles to Overcome the Hydrophobicity of Ellagic Acid: An Antioxidant Hybrid Material

Antioxidants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 153 ◽  
Author(s):  
Szabolcs Muráth ◽  
Adél Szerlauth ◽  
Dániel Sebők ◽  
István Szilágyi
Keyword(s):  
Antioxidant Activity ◽  
Organic Solvents ◽  
Layered Double Hydroxide ◽  
Ellagic Acid ◽  
Water Solubility ◽  
Radical Scavenging ◽  
Experimental Conditions ◽  
Test Reactions ◽  
High Concentrations ◽  
Double Hydroxide

Ellagic acid (EA), a polyphenolic antioxidant of poor water solubility, was intercalated into biocompatible layered double hydroxide (LDH) nanoparticles by the coprecipitation method. Structural investigation of the composite revealed that the lactone bonds split under the synthetic experimental conditions, and EA was transformed to 4,4′,5,5′,6,6′-hexahydroxydiphenic acid during intercalation. To improve the surface properties of the EA-LDH composite, the samples were treated with different organic solvents. The antioxidant activity of the LDH hybrids was assessed in test reactions. Most of the obtained hybrids showed antioxidant activity comparable to the one of the free EA indicating that the spontaneous structural transformation upon immobilization did not change the efficiency in radical scavenging. Treatments with organic solvents influenced the activities of the materials remarkably. The main advantage of the immobilization procedure is that the products can be applied in aqueous samples in high concentrations overcoming the problem related to the low solubility of EA in water. The developed composites of high antioxidant content can be applied as efficient reactive oxygen species scavenging materials during biomedical treatments or industrial manufacturing processes.

Pyrophyllite clay for bacteriophage MS2 removal in the presence of fluoride

2013 ◽  
Vol 14 (3) ◽  
pp. 485-492
Author(s):  
Jeong-Ann Park ◽  
Jae-Hyun Kim ◽  
Chang-Gu Lee ◽  
Song-Bae Kim
Keyword(s):  
Aqueous Solution ◽  
Column Experiments ◽  
Batch Experiments ◽  
Fluoride Ions ◽  
Removal Capacity ◽  
Bacteriophage Ms2 ◽  
Flow Through ◽  
Percentage Removal

The aim of this study was to investigate the removal of the bacteriophage MS2 from aqueous solution using pyrophyllite. Batch experiments were conducted to examine MS2 sorption to pyrophyllite. The influence of fluoride, a groundwater contaminant, on the removal of MS2 was also observed. Column experiments were performed with pyrophyllite to examine MS2 removal in the absence and presence of fluoride. Batch results demonstrated that pyrophyllite was effective in MS2 removal. The percentage removal of MS2 increased from 5.26% to 99.99% (4.0 log removal) with increasing pyrophyllite concentrations from 0.2 to 20 g/L. At fluoride concentrations of 5 and 10 mg/L, the log removals of MS2 by pyrophyllite were 3.05 and 2.54, respectively, which were lower than that with no fluoride present. The results suggested that the removal of MS2 by pyrophyllite was influenced by fluoride ions because fluoride ions could compete with MS2 for sorption sites on the pyrophyllite surfaces. Column results showed that pyrophyllite was effective in MS2 removal under flow-through conditions, with a removal capacity of 8.17 × 106pfu/g with no fluoride present and 4.70 × 106pfu/g with 5 mg/L fluoride present.

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.

Removal of Methyl Orange from Aqueous Solutions by Using Zn-Al Layered Double Hydroxide as Photocatalyst

2015 ◽  
Vol 1 (2) ◽  
pp. 36-41
Author(s):  
Laura Cocheci ◽  
◽  
Ancuta-Corina Marcu ◽  
Paul Barvinschi ◽  
Aniela Pop
Keyword(s):  
Methyl Orange ◽  
Aqueous Solutions ◽  
Layered Double Hydroxide ◽  
Double Hydroxide
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