Preparation and properties of thermo-sensitive surface Pb(Ⅱ) ion-imprinted polymers

Zhang, Xing; Wang, Haoqing; Sun, Xin; Shang, Hongzhou; Di, Ya-Li; Zhao, Zheng

doi:10.1016/j.colsurfa.2019.05.064

Cited by 25 publications

(7 citation statements)

References 42 publications

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“…For PAM, the absorption band at 1654 cm −1 corresponded to the stretching vibration of CO (amide I). In addition, the strong characteristic absorption peak at 586 cm −1 in the Fe 3 O 4 curves was assigned to Fe–O vibration 23 . In the infrared spectra of these three IIMs, the position of characteristic peaks was consistent, and it can be clearly seen from the infrared spectra that the spectra of three IIMs all contain characteristic peaks of CTS, PAM, and Fe 3 O 4.…”

Section: Resultsmentioning

confidence: 69%

“…In addition, the strong characteristic absorption peak at 586 cm À1 in the Fe 3 O 4 curves was assigned to Fe-O vibration. 23 In the infrared spectra of these three IIMs, the position of characteristic peaks was consistent, and it can be clearly seen from the infrared spectra that the spectra of three IIMs all contain characteristic peaks of CTS, PAM, and Fe 3 O 4. Moreover, the intensity of the characteristic peaks corresponding to CTS were enhanced with the increase of the amount of CTS in microspheres.…”

Section: Adsorption Experimentsmentioning

confidence: 61%

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Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Zhong-hua

Zou

Zhao

et al. 2022

Env Prog and Sustain Energy

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Magnetic ion-imprinted microspheres (IIM) with core-shell structure were successfully prepared by reverse emulsion polymerization and applied to adsorb heavy metal ions from sewage. The semi-interpenetrating polymer network composed of cross-linked polyacrylamide (PAM) and linear chitosan (CTS) was used as the microgel shell of microspheres, which can not only fully retain the active sites of CTS but also tightly encapsulate magnetic particle nuclei. In addition, ion imprinting technology was used to further improve the adsorption capacity. In this study, the effects of PAM to CTS ratio on the thermal stability, magnetic properties, and microstructure of microspheres were investigated. Adsorption studies showed that IIM exhibited excellent selective adsorption of Cu(II), and the effects of initial concentration of metal ions, adsorption time, adsorbent dosage, pH, ionic strength, and cycle times on adsorption of Cu(II) by IIM-2 were also studied. In addition, it was revealed that pseudo-second-order kinetic model and Langmuir isotherm model could better simulate the adsorption kinetic and isotherm of IIM-2 for Cu(II), respectively. At 30 C and pH 5.0, the theoretical maximum adsorption capacities for Cu(II) by IIM-2 were 151.13 mg/g. X-ray photoelectron spectroscopy and Zeta potential study showed that the adsorption mechanism of IIM-2 was a combination of electrostatic interaction and ion exchange.

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Section: Resultsmentioning

confidence: 69%

Section: Adsorption Experimentsmentioning

confidence: 61%

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Zhong-hua

Zou

Zhao

et al. 2022

Env Prog and Sustain Energy

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“…At 45 °C, PDEA was in a shrinking global state. Although the deformed imprinted cavity benefited for desorption, the contraction pores of CS-Re-TIICM made template ions diffuse from the CS-Re-TIICM matrix to the eluent solution barely; thus, Q d showed a minimum value relatedly …”

Section: Resultsmentioning

confidence: 99%

Chitosan-Comodified Surface-Grafted Thermosensitive Ion-Imprinted Composite Membrane for the Selective Recognition and Separation of ReO₄^–

Liu

Zhao

et al. 2023

ACS Appl. Polym. Mater.

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With decreasing global rhenium resources, it has become important to separate and purify rhenium in secondary resources, so a preparation strategy for a chitosan-comodified surface-grafted thermosensitive ion-imprinted composite membrane (CS-Re-TIICM) was developed in this work. The key of this design was that the two ends of a poly(N,N-diethylacrylamide) (PDEA) chain were grafted onto the imprinted polymer separating the layer matrix and the surface of the membrane, respectively, which aimed to improve the selectivity and desorption ratio of this material simultaneously. The structure and morphology of this material were characterized by FTIR and SEM, respectively. In addition, CS-Re-TIICM was applied to the secondary leaching solution of the high-temperature alloy to test the actual separation effect, and results showed that CS-Re-TIICM, possessing thermoresponsive recognition sites, and the structure of the imprinting cavity could be adjusted by temperature, which helped this material achieve good selective separation and purification performance for ReO4 –. The maximum adsorption capacity was 0.1071 mmol/g at 35 °C. CS-Re-TIICM not only showed an excellent selectivity (separation ReO4 –/MnO4 – of 3.90 in the presence of interfering ion MnO4 –) but also presented an excellent desorption performance (desorption ratio of 68.94%) and good reusability (adsorption capacity of 0.0425 mmol/g, desorption ratio of 59.13%, and separation degree of 1.24). When CS-Re-TIICM was applied to the secondary leaching solution of high-temperature alloys, the purity of Re was increased from 35.41% to 65.10% after one adsorption/desorption cycle, which depicted a prospective application in the industrialized separation of ReO4 – from a complex environment.

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“…Shakerian et al (2016) evaluated chistosan based IIPs in solid-phase extraction of lead ions. Moreover, chitosan containing IIPs have also been described as useful scavengers of trace metals in conditions were matrix effects tend to limit the adsorption process (Zhang et al 2015(Zhang et al , 2019. Besides the advantages of IIPs, these materials also come with various constraints in particular; deeply placed imprinted cavities which make binding regions beyond reach; poor extraction of template bound analyte ions; reduced transfer of analyte ions, non-uniform binding spots and template bleeding.…”

Section: Ion Imprinted Polymers As Adsorbentsmentioning

confidence: 99%

Recent developments in materials used for the removal of metal ions from acid mine drainage

Mokgehle

Tavengwa

2021

Appl Water Sci

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Acid mine drainage is the reaction of surface water with sub-surface water located on sulfur bearing rocks, resulting in sulfuric acid. These highly acidic conditions result in leaching of non-biodegradeable heavy metals from rock which then accumulate in flora, posing a significant environmental hazard. Hence, reliable, cost effective remediation techniques are continuously sought after by researchers. A range of materials were examined as adsorbents in the extraction of heavy metal ions from acid mine drainage (AMD). However, these materials generally have moderate to poor adsorption capacities. To address this problem, researchers have recently turned to nano-sized materials to enhance the surface area of the adsorbent when in contact with the heavy metal solution. Lately, there have been developments in studying the surface chemistry of nano-engineered materials during adsorption, which involved alterations in the physical and chemical make-up of nanomaterials. The resultant surface engineered nanomaterials have been proven to show rapid adsorption rates and remarkable adsorption capacities for removal of a wide range of heavy metal contaminants in AMD compared to the unmodified nanomaterials. A brief overview of zeolites as adsorbents and the developent of nanosorbents to modernly applied magnetic sorbents and ion imprinted polymers will be discussed. This work provides researchers with thorough insight into the adsorption mechanism and performance of nanosorbents, and finds common ground between the past, present and future of these versatile materials.

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Preparation and properties of thermo-sensitive surface Pb(Ⅱ) ion-imprinted polymers

Cited by 25 publications

References 42 publications

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Chitosan-Comodified Surface-Grafted Thermosensitive Ion-Imprinted Composite Membrane for the Selective Recognition and Separation of ReO₄^–

Recent developments in materials used for the removal of metal ions from acid mine drainage

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Preparation and properties of thermo-sensitive surface Pb(Ⅱ) ion-imprinted polymers

Cited by 25 publications

References 42 publications

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Chitosan-Comodified Surface-Grafted Thermosensitive Ion-Imprinted Composite Membrane for the Selective Recognition and Separation of ReO4–

Recent developments in materials used for the removal of metal ions from acid mine drainage

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Product

Resources

About

Chitosan-Comodified Surface-Grafted Thermosensitive Ion-Imprinted Composite Membrane for the Selective Recognition and Separation of ReO₄^–