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Functionalized layered double hydroxide with nitrogen and sulfur co-decorated carbondots for highly selective and efficient removal of soft Hg 2+ and Ag + ions
A facile composite was fabricated via direct assembly of nitrogen and sulfur co-decorated carbon dots with abundant oxygen-containing functional groups on the surface of the positively charged layered double hydroxide (N,S-CDs-LDH). The novel N,S-CDs-LDH demonstrates highly selective bindings (M-S)...
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| Published in: | Journal of hazardous materials 2018-05, Vol.357, p.217 |
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| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | A facile composite was fabricated via direct assembly of nitrogen and sulfur co-decorated carbon dots with abundant oxygen-containing functional groups on the surface of the positively charged layered double hydroxide (N,S-CDs-LDH). The novel N,S-CDs-LDH demonstrates highly selective bindings (M-S) and an extremely efficient removal capacity for soft metal ions such as Ag
and Hg
ions. N,S-CDs-LDH displayed a selectivity order of Ag
> Hg
>> Cu
>>> Pb
> Zn
> Cd
for their adsorption. The enormous capacities for Hg
(625.0 mg g
) and Ag
(714.3 mg g
) and very high distribution coefficients (K
) of 9.9 × 10
mL g
(C
= 20 mg L
) and 2.0 × 10
mL g
(C
= 20 mg L
) for Hg
and Ag
, respectively, place the N,S-CDs-LDH at the top of LDH based materials known for such removal. The adsorption kinetic curves for Hg
and Ag
fitted well with the pseudo-second order model. For Hg
and Ag
, an exceptionally rapid capture with removal ∼100% within 80 min was observed (C
= 30 mg L
and V/m ratio of 1000). The adsorption isotherms were well described using Langmuir isotherm. The N,S-CDs-LDH was successfully applied to highly efficient removal of Hg
and Ag
from aqueous solutions. |
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| ISSN: | 1873-3336 |