Chitin/egg shell membrane@FeO nanocomposite hydrogel for efficient removal of Pb from aqueous solution
The development of adsorbents by using the byproducts or waste from large-scale industrial and agricultural production is of great significance, and is considered to be an economic and efficient strategy to remove the heavy metals from polluted water. In this work, a novel chitin/EM@Fe 3 O 4 nanocom...
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Published in | RSC advances Vol. 12; no. 7; pp. 4417 - 4427 |
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Main Authors | , , , , , , |
Format | Journal Article |
Published |
03.02.2022
|
Online Access | Get full text |
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Summary: | The development of adsorbents by using the byproducts or waste from large-scale industrial and agricultural production is of great significance, and is considered to be an economic and efficient strategy to remove the heavy metals from polluted water. In this work, a novel chitin/EM@Fe
3
O
4
nanocomposite hydrogel was obtained from a NaOH/urea aqueous system, where the proteins of egg shell membrane and Fe
3
O
4
nanoparticles were chemically bonded to chitin polymer chains with the help of epichlorohydrin. Due to the existence of a large number of -NH
2
, -OH, -CONH-, -COOH and hemiacetal groups, the adsorption efficiency for Pb
2+
into the absorbent was dramatically enhanced. The experimental results revealed that the adsorption behavior strongly depends on various factors, such as initial pH, initial Pb
2+
concentration, incubation temperature and contact time. The kinetic experiments indicated that the adsorption process for Pb
2+
in water solution agreed with the pseudo-second-order kinetic equation. The film diffusion or chemical reaction is the rate limiting process in the initial adsorption stage, and the adsorption of Pb
2+
into the nanocomposite hydrogel can well fit the Langmuir isotherm. Thermodynamic analysis demonstrated that such adsorption behaviors were dominated by an endothermic (Δ
H
° > 0) and spontaneous (Δ
G
° < 0) process.
A novel kind of chitin/EM@Fe
3
O
4
nanocomposite hydrogel derived from the biowastes of egg shell membrane and chitin was successfully prepared for efficient removal of Pb
2+
from wastewater solution. |
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Bibliography: | 10.1039/d1ra08744d Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2046-2069 |
DOI: | 10.1039/d1ra08744d |