TY - JOUR
T1 - Fabrication of phosphate functionalized chiral nematic mesoporous silica films for the efficient and selective adsorption of lanthanum ions
AU - Liu, Enxiu
AU - Chen, Li
AU - Dai, Jiangdong
AU - Wang, Yunyun
AU - Li, Chunxiang
AU - Yan, Yongsheng
N1 - Publisher Copyright:
© 2019
PY - 2019/3/1
Y1 - 2019/3/1
N2 - Excessive consumption and exploitation of rare earth elements (REEs) had led to the serious waste of resources and environmental problems in terms of the abandoned REEs-containing secondary resources, such as optical glasses doped with lanthanum (La). In this article, two types of bio-templated chiral nematic mesoporous silica films (MSFs) were prepared via the direct copolymerization (MSFs-1) and post-grafting (MSFs-2), respectively, for the selective adsorption of La(III). Nanocrystalline celluloses (NCCs) were applied as a structural oriented bio-template and phosphate groups with specific recognition ability for La(III) were modified on the surface of both films. The films retained the well-ordered chiral nematic structure with large surface area and uniform pore size after the removal of NCCs without any disruption of organosilica frameworks. Both MSFs-1 and MSFs-2 showed strong adsorption affinity for La(III) with the maximum adsorption capacity of 77.74 and 69.24 mg g −1 at pH = 7, respectively. The distribution coefficients for La(III) were 832 mL g −1 for MSFs-1 and 805 mL g −1 for MSFs-2, which indicated both films possessed good selectivity for La(III). Owing to this highly ordered chiral nematic mesoporous structure, the adsorption equilibrium could be reached within 3.0 h at 298 K. Furthermore, the MSFs exhibited the excellent regeneration ability, showing potential application possibility for the selective adsorption of La(III).
AB - Excessive consumption and exploitation of rare earth elements (REEs) had led to the serious waste of resources and environmental problems in terms of the abandoned REEs-containing secondary resources, such as optical glasses doped with lanthanum (La). In this article, two types of bio-templated chiral nematic mesoporous silica films (MSFs) were prepared via the direct copolymerization (MSFs-1) and post-grafting (MSFs-2), respectively, for the selective adsorption of La(III). Nanocrystalline celluloses (NCCs) were applied as a structural oriented bio-template and phosphate groups with specific recognition ability for La(III) were modified on the surface of both films. The films retained the well-ordered chiral nematic structure with large surface area and uniform pore size after the removal of NCCs without any disruption of organosilica frameworks. Both MSFs-1 and MSFs-2 showed strong adsorption affinity for La(III) with the maximum adsorption capacity of 77.74 and 69.24 mg g −1 at pH = 7, respectively. The distribution coefficients for La(III) were 832 mL g −1 for MSFs-1 and 805 mL g −1 for MSFs-2, which indicated both films possessed good selectivity for La(III). Owing to this highly ordered chiral nematic mesoporous structure, the adsorption equilibrium could be reached within 3.0 h at 298 K. Furthermore, the MSFs exhibited the excellent regeneration ability, showing potential application possibility for the selective adsorption of La(III).
KW - Lanthanum
KW - Mesoporous silica films
KW - Nanocrystalline celluloses
KW - Selective adsorption
KW - Structural oriented template
UR - http://www.scopus.com/inward/record.url?scp=85059813743&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2019.01.032
DO - 10.1016/j.molliq.2019.01.032
M3 - 文章
AN - SCOPUS:85059813743
SN - 0167-7322
VL - 277
SP - 786
EP - 793
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
ER -