Preparation of SBA-15 surface lanthanum ion-imprinted polymer and its adsorption properties

Yue, Longlong; Xie, Qian; Yang, Yong; Li, Jing; Li, Xiancai

doi:10.1007/s00289-020-03395-x

Cited by 11 publications

(9 citation statements)

References 21 publications

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“…But the separation performances of La(III) and other three heavy REEs are lower than that of La(III) and Ce(III), mainly due to the much lower ion radius of heavy REEs. As shown in previous research studies, the selectivity of La/Ce is 2.36 for La-IIP-PEI/SBA-15 and 3.42 for La-IIP-MAA/Fe 3 O 4 -GO. , And the selectivity of Gd/Ce is reported to be 2.23 for Gd-IIP-CS/CNT . Nevertheless, these IIPs still show the excellent selectivity of La(III).…”

Section: Resultsmentioning

confidence: 57%

“…As shown in previous research studies, the selectivity of La/Ce is 2.36 for La-IIP-PEI/SBA-15 and 3.42 for La-IIP-MAA/Fe 3 O 4 -GO. 23,25 And the selectivity of Gd/Ce is reported to be 2.23 for Gd-IIP-CS/CNT. 36 Nevertheless, these IIPs still show the excellent selectivity of La(III).…”

Section: ■ Introductionmentioning

confidence: 99%

“…To increase more accessible sites or gain other specific features, the incorporation of various carriers has been proposed, leading to the well-defined substrate-supported IIPs. For example, mesoporous molecular sieves SBA-15 or MCM-41 that has large surface areas are quite suitable to be associated with polyethyleneimine (PEI) to form La(III)-IIP-SBA-15/PEI or La(III)-IIP-MCM-41/PEI. , The enhanced adsorption capacities of the above adsorbents are attributed to the synergy effect between the large porosities of carriers and the amine groups of functional monomers. On the other hand, magnetic iron oxides usually can endow the nanomaterials with the magnetic nature and facilitate the easy separation of adsorbents from solution via magnetic forces.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Zhang

Liu

Guo

et al. 2023

ACS Appl. Polym. Mater.

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Selective recognition and separation of rare-earth elements (REEs) is considered a real challenge for the RE industry. In this work, two dual-site ion-imprinted polymers (IIP-AM and IIP-MAA) were synthesized via a radical copolymerization method for the removal of La(III) from aqueous solutions. The structures of samples were characterized and confirmed with various kinds of techniques, including IR, X-ray diffraction, field emission scanning electron microscopy, Brunauer–Emmett–Teller, thermogravimetry analysis, and X-ray photoelectron spectroscopy (XPS). Adsorption studies reveal that the pseudo-second-order kinetic model and the Langmuir isotherm model were well-fitted with the adsorption of La(III), showing high adsorption capacities of 45.65 and 50.05 mg/g for IIP-AM and IIP-MAA, respectively, after 120 min at pH = 5.5 and 25 °C. Impressively, the fabricated IIPs possess remarkable selectivity between La(III) and other REEs, as well as excellent reusability after five successive adsorption–regeneration cycles with less than 9% reduction of capacities. The adsorption mechanism indicates that the surface complexation and electrostatic attraction contribute to the adsorption of La(III) based on the characterization analysis of XPS, elemental mapping, and energy-dispersive spectrometry, as well as density functional theory calculations. Accordingly, these samples with tailored ion-imprinted cavities and abundant active O sites entirely exhibit the potentials for the selective recovery of REEs from aqueous solutions.

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Section: Resultsmentioning

confidence: 57%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Zhang

Liu

Guo

et al. 2023

ACS Appl. Polym. Mater.

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“…The peak at 1631 cm –1 was attributed to the bending vibration peak of adsorbed water . The peak at 3432 cm –1 was attributed to the stretching vibration peak of the −OH group . In addition, the peak at 967 cm –1 on the SBA-15 sample was attributed to the stretching vibration peak of the non-bridging Si–OH group .…”

Section: Results and Discussionmentioning

confidence: 99%

“…37 The peak at 3432 cm −1 was attributed to the stretching vibration peak of the −OH group. 38 In addition, the peak at 967 cm −1 on the SBA-15 sample was attributed to the stretching vibration peak of the non-bridging Si−OH group. 32 According to the comparison, it was found that the intensity of the bending vibration peak of adsorbed water and the tensile vibration peak of the −OH group decreased with the increase of the calcination temperature.…”

Section: Resultsmentioning

confidence: 99%

Surface Properties and Microstructures of Al-SBA-15 under Different Temperature Calcinations in Relation to Adsorption Performance

Liu

et al. 2023

J. Phys. Chem. C

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In this study, the calcination temperature was adjusted to influence the properties, including surface alumina types, microstructure, and surface acidity, and then to explore their association with the performance of As(V) adsorption after preparing aluminum-modified SBA-15 (Al-SBA-15 x ) by the incipient wetness impregnation method. The results showed that calcination promoted the formation of aluminum oxides with different coordination environments on SBA-15 carriers, resulting in different kinds of acid sites and Al−OH groups, which were the adsorption sites for As(V). However, with the increase in the calcination temperature, the total surface acidity on the Al-SBA-15 x samples gradually decreased, and the dehydration and dehydroxylation reactions of aluminum oxides occurred, which reduced the Al−OH groups and changed the acid−base environment on the samples. Besides, high-temperature calcination caused a partial collapse of mesoporous channels, which was not conducive to dispersing the active adsorption centers on the surface and further reduced the effective utilization of active adsorption centers. Therefore, the adsorption capacity of an Al-SBA-15 x adsorbent for As(V) decreased with the increase of the calcination temperature. Furthermore, kinetic models were used to investigate the relationship between the microstructure and adsorption processes. Finally, recycling tests were performed to demonstrate the reusability of Al-SBA-15 x samples.

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Preparation of pyridine Schiff base grafted ion-imprinted mesoporous sorbent for selective separation of Pb(II) from aqueous medium

Mao¹,

Qiong-xin²,

Wu³

et al. 2022

J Sol-Gel Sci Technol

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Preparation of SBA-15 surface lanthanum ion-imprinted polymer and its adsorption properties

Cited by 11 publications

References 21 publications

Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Surface Properties and Microstructures of Al-SBA-15 under Different Temperature Calcinations in Relation to Adsorption Performance

Preparation of pyridine Schiff base grafted ion-imprinted mesoporous sorbent for selective separation of Pb(II) from aqueous medium

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