期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 4, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.105721
关键词
Ferrihydrite; Goethite; Heavy metal pollution; Adsorption mechanism; Environmental remediation
资金
- Application Technology Research and Development Projects of Heilongjiang Province [GA19B105]
- National Natural Science Fund for Distinguished Young Scholars [41625002]
- National Natural Science Foundation of China [41961144030]
- Natural Science Foundation of Heilongjiang Province of China [ZD2020C001]
- Heilongjiang Provincial Key Laboratory of Soil Protection and Remediation
P-FH is an efficient heavy metal adsorbent with high adsorption capacity and selectivity for removing Pb(II) from aqueous solutions. The adsorption process follows the pseudo-second-order kinetic model and Freundlich adsorption isotherm model. P-FH maintains a high adsorption rate even after multiple sorption-regeneration cycles.
The developments of environmentally friendly and efficient heavy metal adsorbents face challenges. A new adsorbent, P-doped ferrihydrite (P-FH) was designed to remove Pb(II) from the aqueous solution. Various techniques are implemented to characterize P-FH. P-FH was confirmed the formation of the second-line ferrihydrite phase by X-ray diffraction. Scanning electron microscopy (SEM) indicated that P-FH composed of a large number of uniform nanoparticles with a specific surface area (S-BET) of 431.2 m(2)/g, and it is an ultra-small mesoporous material. Batch adsorption experiments showed that adsorption capacity of P-FH for Pb(II) increases with the increase of pH value or temperature. P-FH possesses a high adsorption capacity of 246.8 mg/g (25 degrees C, pH = 6) for Pb(II) in solution, which is very competitive compared with other representative adsorbents. The adsorption process of Pb(II) onto P-FH is more in line with the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model. Moreover, P-FH has a high selectivity for Pb(II) adsorption. Cation exchange, complexation electrostatic attraction jointly contributed to the efficient adsorption of Pb(II) on P-FH from aqueous solution. Additionally, a high adsorption rate of 81% was held after six sorption-regeneration cycles. This work provides a simple one-pot method to prepare an environmentally friendly adsorbent for Pb (II) efficient adsorption.
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