Synthesis and phosphate uptake behavior of Zr4+ incorporated MgAl-layered double hydroxides

Chitrakar, Ramesh; Tezuka, Satoko; Sonoda, Akinari; Sakane, Kohji; Ooi, Kenta; Hirotsu, Takahiro

doi:10.1016/j.jcis.2007.04.004

Cited by 67 publications

(70 citation statements)

References 33 publications

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“…K F is a measure of adsorption capacity, and 1/n refers to the adsorption intensity of the system. It is shown that 1/n values between 0.1 and 1.0 refers to an interaction between exchange sites in the adsorbent and Cd(II) cations [20,26,28,29]. The K F and 1/n in Table 2 indicates the adsorption process is favorable.…”

Section: Adsorption Isotherms and Kinetic Modelsmentioning

confidence: 99%

Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

Zhang¹,

Kano²,

Inoue³

2016

JCCE

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Abstract:The hydrotalcite-like compound [Zn 2 Al(OH) 6 ]NO 3 ·mH 2 O (shorted as ZnAl-NO 3 ) was intercalated with the chelating agent EDTA (ethylene diamine tetraacetic acid) by anion exchange to uptake cadmium ion from aqueous solutions. The materials synthesized in this work were characterized by chemical analysis, FT-IR (fourier transform infrared spectroscopy), XRD (X-ray powder diffraction) to confirm their properties. In order to investigate the optimum conditions for Cd(II) adsorption, the amount of Cd(II) adsorbed by Zn-Al LDHs intercalated with EDTA (ZnAl-EDTA) under different conditions (i.e., adsorbent dosage, temperature and contact time) were determined by ICP-AES (inductively coupled plasma-atomic emission spectrometry). Adsorption isotherms of Cd(II) onto ZnAl-EDTA were measured at varying initial Cd concentrations (0.05 mg/L to 1 mg/L) under optimized conditions. The data were applied to Langmuir and Freundlich isotherms model, and well fitted by the Freundlich isotherms model. The pseudo-second-order kinetic model was more adequate to describe the kinetic in this case.

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Section: Adsorption Isotherms and Kinetic Modelsmentioning

confidence: 99%

Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

Zhang¹,

Kano²,

Inoue³

2016

JCCE

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“…Although these adsorbents work well in a phosphate solution, most of them are not useful in a solution including plenty of other anions such as seawater. For example, though the phosphate uptake from the wastewater on the binary MgAl-LDH was 10 mg-P/g, that from seawater was less than 1 mg-P/g [25].…”

Section: Introductionmentioning

confidence: 97%

“…Recently, Chitrakar et al prepared novel Zr modified MgAl-LDH, Zr-MgAl-LDH, which possessed high crystalline LDH and showed the higher phosphate adsorption properties from seawater than usual adsorbents [25]. The novel Zr-MgAl-LDH were prepared by a new coprecipitation method and hydrothermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Phosphate Adsorption Site on Zirconium Ion Modified MgAl-layered Double Hydroxides

et al. 2009

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“…LDHs can be represented by the general formula [M 2+ 1´x M 3+ x (OH) 2 ] x+ (A) n´x /2¨m H 2 O, where the cations M 2+ and M 3+ occupy the octahedral holes in a brucite-like layer and the anion A n´i s located in the hydrated interlayer galleries [16]. The because of their many applications as precursors to magnetic materials [17], catalysts [18,19] and anion exchangers [20][21][22][23][24]. In the authors' previous studies [14,15], a nano-sized LDH (Mg 6 Al 2 (OH) 16 CO 3¨4 H 2 O) and LDH (Mg 6 Al 2 (OH) 16 MoO 4¨4 H 2 O) coatings with ion-exchange and self-healing ability were obtained by the combination of the co-precipitation and hydrothermal treatment on the AZ31 Mg alloy.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys

Zhang

Zeng

et al. 2016

Metals

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Abstract:Coatings of the Mg(OH) 2 /Mg-Al layered double hydroxide (LDH) composite were formed by a combined co-precipitation method and hydrothermal process on the AZ31 alloy substrate in alkaline condition. Subsequently, a superhydrophobic surface was successfully constructed to modify the composite coatings on the AZ31 alloy substrate using stearic acid. The characteristics of the composite coatings were investigated by means of X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electronic microscope (SEM) and contact angle (CA). The corrosion resistance of the coatings was assessed by potentiodynamic polarization, the electrochemical impedance spectrum (EIS), the test of hydrogen evolution and the immersion test. The results showed that the superhydrophobic coatings considerably improved the corrosion resistant performance of the LDH coatings on the AZ31 alloy substrate.

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Synthesis and phosphate uptake behavior of Zr4+ incorporated MgAl-layered double hydroxides

Cited by 67 publications

References 33 publications

Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

Phosphate Adsorption Site on Zirconium Ion Modified MgAl-layered Double Hydroxides

Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys

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