TY - JOUR
T1 - Facile Preparation of Millimeter-Sized Sodium Alginate-Silica Composite Spheres for Highly Selective Adsorption of Heavy Metal Ions
AU - Zhou, Ailing
AU - Chi, Chenglong
AU - Jia, Aizhong
AU - Li, Fang
AU - Wang, Yingying
AU - Wang, Yanji
N1 - Funding Information:
. This work was supported by the State Key Program of National Natural Science of China [No. 21236001]; Funds for Central Government Guides the Development of Local Science and Technology [No. 216Z3701G]; Tianjin Municipal Natural Science Foundation [No. 15JCYBJC21000]; the Excellent Going Abroad Experts′ Training Program in Hebei Province
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/5/19
Y1 - 2022/5/19
N2 - Millimeter-sized (∼3.5 mm) sodium alginate-silica composite spheres with macroporous structure and functional groups of amino- (NH2-SiO2/SA) and sulfhydryl (SH-SiO2/SA), respectively, were successfully prepared by a simple hydrothermal copolycondensation. The obtained materials were characterized by FT-IR, SEM, XPS, N2 adsorption-desorption techniques, and their heavy metal ion adsorption performance was evaluated in detail under different conditions. Characterization results revealed that the functional group plays a key role in the selectivity of metal ions, that is, NH2-SiO2/SA preferentially adsorbs the relatively hard Pb(II) ions while SH-SiO2/SA favors the softer Ag(I) ion, which is attributed to the fact that S atoms are softer donor than N atoms. The adsorption kinetics and the adsorption equilibrium fitted well with the pseudo-second-order model and Langmuir adsorption isotherms, respectively. The adsorption experiments showed the maximum adsorption capacities of Pb(II) for NH2-SiO2/SA and Ag(I) for SH-SiO2/SA are 460 mg/g and 417 mg/g, respectively, giving good stability without a significant decrease in 5 recycles. Therefore, the synthesized materials display promising adsorbents for recycling heavy metal pollutants from wastewater due to their good selectivity, high adsorption capacity, stability and easy recovery due to their large size.
AB - Millimeter-sized (∼3.5 mm) sodium alginate-silica composite spheres with macroporous structure and functional groups of amino- (NH2-SiO2/SA) and sulfhydryl (SH-SiO2/SA), respectively, were successfully prepared by a simple hydrothermal copolycondensation. The obtained materials were characterized by FT-IR, SEM, XPS, N2 adsorption-desorption techniques, and their heavy metal ion adsorption performance was evaluated in detail under different conditions. Characterization results revealed that the functional group plays a key role in the selectivity of metal ions, that is, NH2-SiO2/SA preferentially adsorbs the relatively hard Pb(II) ions while SH-SiO2/SA favors the softer Ag(I) ion, which is attributed to the fact that S atoms are softer donor than N atoms. The adsorption kinetics and the adsorption equilibrium fitted well with the pseudo-second-order model and Langmuir adsorption isotherms, respectively. The adsorption experiments showed the maximum adsorption capacities of Pb(II) for NH2-SiO2/SA and Ag(I) for SH-SiO2/SA are 460 mg/g and 417 mg/g, respectively, giving good stability without a significant decrease in 5 recycles. Therefore, the synthesized materials display promising adsorbents for recycling heavy metal pollutants from wastewater due to their good selectivity, high adsorption capacity, stability and easy recovery due to their large size.
KW - Adsorption
KW - Copolymerization
KW - Heavy metal ions
KW - Millimeter-sized sphere
KW - Sodium alginate-silica
UR - http://www.scopus.com/inward/record.url?scp=85130293304&partnerID=8YFLogxK
U2 - 10.1002/slct.202104476
DO - 10.1002/slct.202104476
M3 - Article
AN - SCOPUS:85130293304
SN - 2365-6549
VL - 7
JO - ChemistrySelect
JF - ChemistrySelect
IS - 19
M1 - e202104476
ER -