Abstract
A new one-pot synthesis of highly crystalline MgAl-, CoAl- and ZnAl-layered double hydroxides (LDHs) containing NO3 − as interlayer anion along with the surface functionalization of L-arginine was demonstrated by the ecofriendly alkali-free arginine-assisted hydrothermal method to examine the adsorptive reduction of chromate (CrO4 2−) from aqueous solutions. The amino acid mediated water hydrolysis resulted abundant OH− in the medium, which served as precipitant, and the NO3 − from metal precursor acts as an interlayer anion along with surface functionalization of amino acid. Adsorption studies revealed that the removal of CrO4 2− by anion exchange was the greatest in MgAl-LDH with 1.619 mmol-Cr/g of LDH. The mechanism of CrO4 2− removal was due to the ion-exchange of NO3 − from the interlayer as well as the counter anions present on the functionalized arginine cation. The adsorbed CrO4 2− was partially reduced to nontoxic Cr3+ on the surface of LDH due to the presence of amino acid functionalization. The present technique provides several advantages from the aspect of sustainable chemistry: (i) avoiding hazardous alkali for the preparation of LDH, (ii) removal of CrO4 2− by ion-exchange and (iii) partial detoxification of CrO4 2− by reduction to Cr3+ on the surface of the LDH.
| Original language | English |
|---|---|
| Pages (from-to) | 10459-10469 |
| Number of pages | 11 |
| Journal | ChemistrySelect |
| Volume | 2 |
| Issue number | 32 |
| DOIs | |
| Publication status | Published - Jan 1 2017 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
Cite this
Eco-Friendly Alkali-Free Arginine-Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency. / Koilraj, Paulmanickam; Sasaki, Keiko.
In: ChemistrySelect, Vol. 2, No. 32, 01.01.2017, p. 10459-10469.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Eco-Friendly Alkali-Free Arginine-Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency
AU - Koilraj, Paulmanickam
AU - Sasaki, Keiko
PY - 2017/1/1
Y1 - 2017/1/1
N2 - A new one-pot synthesis of highly crystalline MgAl-, CoAl- and ZnAl-layered double hydroxides (LDHs) containing NO3 − as interlayer anion along with the surface functionalization of L-arginine was demonstrated by the ecofriendly alkali-free arginine-assisted hydrothermal method to examine the adsorptive reduction of chromate (CrO4 2−) from aqueous solutions. The amino acid mediated water hydrolysis resulted abundant OH− in the medium, which served as precipitant, and the NO3 − from metal precursor acts as an interlayer anion along with surface functionalization of amino acid. Adsorption studies revealed that the removal of CrO4 2− by anion exchange was the greatest in MgAl-LDH with 1.619 mmol-Cr/g of LDH. The mechanism of CrO4 2− removal was due to the ion-exchange of NO3 − from the interlayer as well as the counter anions present on the functionalized arginine cation. The adsorbed CrO4 2− was partially reduced to nontoxic Cr3+ on the surface of LDH due to the presence of amino acid functionalization. The present technique provides several advantages from the aspect of sustainable chemistry: (i) avoiding hazardous alkali for the preparation of LDH, (ii) removal of CrO4 2− by ion-exchange and (iii) partial detoxification of CrO4 2− by reduction to Cr3+ on the surface of the LDH.
AB - A new one-pot synthesis of highly crystalline MgAl-, CoAl- and ZnAl-layered double hydroxides (LDHs) containing NO3 − as interlayer anion along with the surface functionalization of L-arginine was demonstrated by the ecofriendly alkali-free arginine-assisted hydrothermal method to examine the adsorptive reduction of chromate (CrO4 2−) from aqueous solutions. The amino acid mediated water hydrolysis resulted abundant OH− in the medium, which served as precipitant, and the NO3 − from metal precursor acts as an interlayer anion along with surface functionalization of amino acid. Adsorption studies revealed that the removal of CrO4 2− by anion exchange was the greatest in MgAl-LDH with 1.619 mmol-Cr/g of LDH. The mechanism of CrO4 2− removal was due to the ion-exchange of NO3 − from the interlayer as well as the counter anions present on the functionalized arginine cation. The adsorbed CrO4 2− was partially reduced to nontoxic Cr3+ on the surface of LDH due to the presence of amino acid functionalization. The present technique provides several advantages from the aspect of sustainable chemistry: (i) avoiding hazardous alkali for the preparation of LDH, (ii) removal of CrO4 2− by ion-exchange and (iii) partial detoxification of CrO4 2− by reduction to Cr3+ on the surface of the LDH.
UR - http://www.scopus.com/inward/record.url?scp=85041830700&partnerID=8YFLogxK
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U2 - 10.1002/slct.201702134
DO - 10.1002/slct.201702134
M3 - Article
AN - SCOPUS:85041830700
VL - 2
SP - 10459
EP - 10469
JO - ChemistrySelect
JF - ChemistrySelect
SN - 2365-6549
IS - 32
ER -