Adsorption of CO2 by hierarchical structures of f-MWCNTs@Zn/Co-ZIF and N-MWCNTs@Zn/Co-ZIF prepared through in situ growth of ZIFs in CNTs

Konni, Madhavi; Doddi, Siva; Dadhich, Anima S.; Mukkamala, Saratchandra Babu

doi:10.1016/j.surfin.2018.04.006

Cited by 16 publications

(6 citation statements)

References 38 publications

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“…5. The TGA curves of MWCNTs/ZIF-67 were consistent with the results of Konni et al 32 From the TGA and DTG curves, the decomposition of polymers was roughly divided into three stages with increasing temperature. For the first mass loss, a slight weight loss of MWCNTs/ZIF-67@MIPs and NIPs occurred from 30 to 274 °C due to evaporation of residual water and solvent derived from the incomplete vacuum drying of the samples.…”

Section: Characterizationsupporting

confidence: 88%

“…Preparation of MWCNTs/ZIF-67@MIPs Synthesis of MWCNTs/ZIF-67 composites The synthesis of MWCNTs/ZIF-67 composites was performed according to the study of Konni et al 32 Firstly, 700 mg of MWCNTs-COOH and 3.5 g of polyvinylpyrrolidone were added to 300 mL of methanol solution. Following ultrasound treatment for 15 min to achieve uniform dispersion, Co(NO 3 ) 2 •6H 2 O (10 g) was added into the mixed solution with magnetic stirring for 2 h at 25 °C to afford solution A.…”

Section: Experimental Materials and Reagentsmentioning

confidence: 99%

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Bilobalide molecularly imprinted polymers prepared using MWCNTs/ZIF‐67 composite as supporter for solid‐phase extraction of bilobalide from real samples

Huang

Liu

Zhang

et al. 2021

Polymer International

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The preparation of raw materials is an important prerequisite for studying the function of natural active ingredients. Here, the preparation of MWCNTs/ZIF-67@MIPs based on surface molecular imprinting technology for the separation of bilobalide (BB) from real samples was proposed. The successful preparation of MWCNTs/ZIF-67@MIPs was demonstrated using several techniques. Adsorption equilibrium was achieved when the time was 4 h, and the rate of adsorption calculated from the dynamic adsorption results was 14.2 ∼g mL -1 h -1 . The maximum adsorption amount for MWCNTs/ZIF-67@MIPs of BB was calculated to be 59.2 mg g -1 , which was more than three times that for MWCNTs/ZIF-67@NIPs (23.1 mg g -1 ), and the Freundlich isotherm model and pseudo-second-order kinetic model were more suitable for the explanation of isothermal and kinetic adsorption behaviors, respectively. The results of selective adsorption indicated that MWCNTs/ZIF-67@MIPs show excellent selectivity and specificity for BB compared to structurally similar compounds such as ginkgolides A, B and C, with an excellent imprinting factor (2.83). The results of reuse studies indicated that MWCNTs/ZIF-67@MIPs exhibited great reproducibility with a recovery rate of 70.8% after repeated use for five times. Finally, the developed MWCNTs/ZIF-67@MIPs were used as a solidphase extraction sorbent to directly separate BB from treated gingko leaf extract and crude extract of BB, and the results suggested that the purity of BB in the two samples was increased by about 30%, and the recoveries reached 68.34% and 71.54%, respectively. Meanwhile, the separation effect of MWCNTs/ZIF-67@MIPs on BB was better than that of BBMIP prepared by bulk polymerization.

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Section: Characterizationsupporting

confidence: 88%

Section: Experimental Materials and Reagentsmentioning

confidence: 99%

Bilobalide molecularly imprinted polymers prepared using MWCNTs/ZIF‐67 composite as supporter for solid‐phase extraction of bilobalide from real samples

Huang

Liu

Zhang

et al. 2021

Polymer International

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show abstract

“…The incorporation of CNTs shifts the selectivity of the ZIF-8 further towards CO 2 . 27,28 The CO 2 uptake is higher compared to that of pristine VACNTs which are reported to possess an adsorption capacity of approx. 4 mmol g −1 of CO 2 at 30 bar.…”

Section: Resultsmentioning

confidence: 94%

“…Solely longer reaction times might influence ZIF-8 particle morphology too and convert already formed irregular shaped ZIF-8 particles (72 h reaction time, Fig. 7) into more [27][28][29]39 It is stated that the surface area is strongly correlated to the added CNTs where less CNT addition results in higher surface area of the composite. CO 2 adsorption measurements were mainly conducted in pressure regions of 1 bar and below, where it was shown that CO 2 uptake could be increased in comparison to sole ZIF-8.…”

Section: Dependence Of the Zif-8@vacnt Surface Area On The Conversion...mentioning

confidence: 99%

“…For example the selectivity towards CO 2 can be enhanced compared to pristine ZIF-8, due to a synergetic effect of CNTs and ZIF-8. 27,28 Also, the combination of the microporous ZIF-8 with the mesoporous CNT material grants access to a wider pressure range, which is why the combination of ZIF-8 and CNTs is a promising composite towards further applications.…”

Section: Introductionmentioning

confidence: 99%

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