TY - JOUR
T1 - Template-free synthesis of an eco-friendly flower-like Mg/Al/Fe-CLDH for efficient arsenate removal from aqueous solutions
AU - Li, Ruiyue
AU - Zhan, Wei
AU - Song, Yanqing
AU - Lan, Jirong
AU - Guo, Li
AU - Zhang, Tian C.
AU - Du, Dongyun
N1 - Funding Information:
This work supported by “Major Innovation Projects” of Hubei Province, P. C. China ( 2019ACA156 ), the National Natural Science Foundation of China ( 52104290 ) and “the Fundamental Research Funds for the Central Universities ”, South-Central University for Nationalities ( CZQ20014 ).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/2/1
Y1 - 2022/2/1
N2 - Mg/Al-LDH is widely used in the removal of aqueous pollutants due to the large surface and high anion exchange capacity, but the traditional Mg/Al-LDH for arsenic removal has a narrow range of pH application. The present study focused on the modifying of the lamellar Mg/Al-LDH to synthesize flower-like nanoparticles for arsenate removal in a wide pH range. Results showed that Mg/Al/Fe-CLDH (calcined Mg/Al/Fe-LDH) exhibited an extremely high arsenate removal efficiency (e.g., reducing As(V) from 10 mg/L to 1 µg/L) in a wide pH range (2–12). Furthermore, it can keep excellent removal efficiency for arsenate under a complex anions environment (co-existing with CO32−, SO42−, PO43−, and F−), and maintain 80% removal efficiency for arsenate after 4 regeneration cycles. SEM, XRD, and XPS results unveiled the following enhancing mechanism for arsenate removal by using this modified Mg/Al-LDH: 1) partial content of ferric ions were successfully insert into the layers of Mg/Al-LDH and substituted by aluminium ions, which produce more affiliative sites for arsenate and expand its feasibility in a wide pH ranges; 2) the flower-like structures facilitate to offer more adsorption sites for arsenate due to its larger specific surface area. In brief, this flower-like Mg/Al/Fe-CLDH has great application potential for eco-friendly purity of arsenate from complicated industrial wastewater.
AB - Mg/Al-LDH is widely used in the removal of aqueous pollutants due to the large surface and high anion exchange capacity, but the traditional Mg/Al-LDH for arsenic removal has a narrow range of pH application. The present study focused on the modifying of the lamellar Mg/Al-LDH to synthesize flower-like nanoparticles for arsenate removal in a wide pH range. Results showed that Mg/Al/Fe-CLDH (calcined Mg/Al/Fe-LDH) exhibited an extremely high arsenate removal efficiency (e.g., reducing As(V) from 10 mg/L to 1 µg/L) in a wide pH range (2–12). Furthermore, it can keep excellent removal efficiency for arsenate under a complex anions environment (co-existing with CO32−, SO42−, PO43−, and F−), and maintain 80% removal efficiency for arsenate after 4 regeneration cycles. SEM, XRD, and XPS results unveiled the following enhancing mechanism for arsenate removal by using this modified Mg/Al-LDH: 1) partial content of ferric ions were successfully insert into the layers of Mg/Al-LDH and substituted by aluminium ions, which produce more affiliative sites for arsenate and expand its feasibility in a wide pH ranges; 2) the flower-like structures facilitate to offer more adsorption sites for arsenate due to its larger specific surface area. In brief, this flower-like Mg/Al/Fe-CLDH has great application potential for eco-friendly purity of arsenate from complicated industrial wastewater.
KW - Adsorption
KW - As(V)
KW - Flower-like structure
KW - Spinel-type mixed oxide
KW - Template-free synthesis
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U2 - 10.1016/j.seppur.2021.120011
DO - 10.1016/j.seppur.2021.120011
M3 - Article
AN - SCOPUS:85118868295
VL - 282
JO - Gas Separation and Purification
JF - Gas Separation and Purification
SN - 1383-5866
M1 - 120011
ER -