CO2 adsorption behavior of amine-functionalized ZIF-8, graphene oxide, and ZIF-8/graphene oxide composites under dry and wet conditions

Pokhrel, Jeewan; Bhoria, Nidhika; Anastasiou, Stavroula; Tsoufis, Τheodoros; Gournis, Dimitrios; Romanos, George E.; Karanikolos, Georgios N.

doi:10.1016/j.micromeso.2018.03.012

Cited by 168 publications

(67 citation statements)

References 77 publications

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“…According to the study, the isoelectric point (pH IEP ) of NH 2 ‐ZIF‐8 was about 9.5 . For Au (III), the anion AuCl 3 (OH) − is the main existence form at the pH ranging from 3–11 .…”

Section: Resultsmentioning

confidence: 96%

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Zhou

et al. 2020

Applied Organom Chemis

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In this paper, zeolitic imidazolate framework‐8 modified by the ethanediamine (NH2‐ZIF‐8) was employed for adsorbing Au (III) and Ag(I) from aqueous solutions. The adsorption capacities of NH2‐ZIF‐8 towards Au (III) and Ag(I) were found to be significantly affected by the pH values of the solution. The adsorption kinetics studies show that NH2‐ZIF‐8 presents a fast adsorption property towards metals, attaining 93% of adsorption equilibrium uptake for Au (III) within the first 30 min. This phenomenon can be ascribed to the coordination interaction between the amino group and Au (III). The thermodynamic data suggest that the adsorption of NH2‐ZIF‐8 towards Au (III) is endothermic process, while that for Ag(I) is exothermic. The maximum adsorption capacities of NH2‐ZIF‐8 toward Au (III) and Ag(I) can be achieved to 357 mg·g−1 and 222.25 mg·g−1, respectively. The metal ions interference results show that Cu (II) and Ni (II) hardly have no interference on Au (III) adsorption in e‐waste containing 1500 mg·l−1 Cu (II),100 mg·l−1 Ni (II) and 10 mg·l−1 Au (III); while for Ag(I), Cd (II) and Zn (II) have little interference on Ag(I) adsorption in the hybrid solutions containing Ag(I), Ni (II), Cd (II) and Zn (II) with equal concentration (50 mg·l−1), but Ni (II) interference most. The XPS study shows that partial Au (III) was reduced to Au(I), and that Ag(I) was completely reduced to Ag(0) during the adsorption process. The abundant of active sites of NH2‐ZIF‐8 containing C=N, N‐H, and Zn‐OH groups play a key role in the adsorption of Au (III) and Ag(I). In addition, electrostatic interaction can be responsible for the adsorption of Au (III) by NH2‐ZIF‐8. The regeneration experiments results show that the adsorption capacities of NH2‐ZIF‐8 towards Au (III) and Ag(I) can maintain after three cycles. This work provides a reliable method to improve the adsorption kinetics for metal ions.

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Section: Resultsmentioning

confidence: 96%

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Zhou

et al. 2020

Applied Organom Chemis

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“…The imidazole ring out‐of‐plane bending vibrations result in absorption bands below 800 cm –1 , such as the peaks at 672 and 755 cm −1 , where the bands due to in‐plane bending vibrations appear in the 900–1350 cm –1 range, such as the peaks at 1104 and 1321 cm –1 . The bands at 1350–1500 cm –1 are associated with the stretching of the entire imidazole ring, with the peak at 1403 cm –1 representing the effects of imidazole ring stretching or bending …”

Section: Resultsmentioning

confidence: 99%

Preparation of ZIF‐8/natural Plant Fiber Composites via Biomimetic Mineralization for Highly Efficient Removal of Formaldehyde

et al. 2019

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Novel composites containing zeolitic imidazolate framework‐8 (ZIF‐8) nanocrystals and natural plant fibers (Juncus effusus (JE) fibers) are successfully synthesized. ZIF‐8 nanocrystals are coated onto hydrophilic JE fibers (H‐JE fibers) via biomimetic mineralization after only several seconds at room temperature (25 °C). The ZIF‐8/H‐JE fiber composite (stirring) and ZIF‐8‐BSA/H‐JE fiber composite (biomimetic mineralization) composite materials have excellent formaldehyde (HCHO) removal properties. ZIF‐8‐BSA/H‐JE fiber composites, in particular, are highly efficient HCHO adsorbents. Up to 99.79% HCHO removal at a high concentration (100 mg/m3) can be achieved within 90 min, and 100% removal can be achieved at a low concentration (10 mg/m3) within 17 min. This study provides an effective strategy for developing natural‐plant‐fiber‐based composite materials for environmental protection.

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“…This cage reordering is possibly due to C=C deprotonation on MIM linker by N-H group during amine modification process [56]. Similarly, ZIF-8/NH 2 /GO composite showed all the characteristics peak of ZIF-8/NH 2 and a small additional reflection for GO [24]. Similarly, ZIF-8/NH 2 /Mg(OH) 2 /GO showed all the characteristic peaks for ZIF-8/NH 2 The morphology of ZIF-8 and its composites was studied by using SEM.…”

Section: Characterizationmentioning

confidence: 88%

“…GO dispersion was prepared in water sonicated for 6 h. Subsequently, ZIF-8/NH 2 was dispersed in methanol and the dispersion was added to the suspension of GO followed by sonication for additional 3 h. The resultant mixture was centrifuged and supernatant was decanted and residual composite was dried at 60°C for 6 h in vacuum oven. Different wt% of GO were added (from 5 wt% to 20 wt%) [24].…”

Section: Synthesis Of Gomentioning

confidence: 99%

“…ZIF-8 in particular has Zn 2+ ions which are in tetrahedral coordination with four imidazolate rings having sodalite (SOD) topology. The high chemical stability, high porosity and surface area, thermal stability and surface functionalization of ZIF-8 make it suitable in adsorption, catalysis and purification [24]. Zeolitic imidazolate frameworks-8 (ZIF-8), with excellent porosity and high surface area, has been widely explored in the removal of pollutants [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption and kinetic study of Cr(VI) on ZIF-8 based composites

Begum

Hussain

Nооr

2020

Mater. Res. Express

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In this study, adsorption of hexavalent chromium has been examined on ZIF-8 and its various composites. ZIF-8 was modified by using amine groups, GO and Mg(OH) 2 /GO. ZIF-8, Mg(OH) 2 /GO, ZIF-8/NH 2 , ZIF-8/Mg(OH) 2 /GO, ZIF-8/NH 2 /GO and ZIF-8/NH 2 /Mg(OH) 2 /GO was studied for Cr(VI) adsorption Several characterization techniques were used for the structural and surface characterization such as Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area analyzer. The impact of various adsorption parameters (contact time, pH, initial concentration of Cr(VI) and absorbent dosage) was studied in batch experiments. Different kinetic and isotherm models were applied on equilibrium data. The adsorption process of ZIF-8 and its composites was explained by pseudo-second-order kinetic model as well as Langmuir isotherm, with maximum removal efficiency of 98% for Cr(VI) by ZIF-8/NH 2 /Mg(OH) 2 /GO. OPEN ACCESS RECEIVED

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CO2 adsorption behavior of amine-functionalized ZIF-8, graphene oxide, and ZIF-8/graphene oxide composites under dry and wet conditions

Cited by 168 publications

References 77 publications

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Preparation of ZIF‐8/natural Plant Fiber Composites via Biomimetic Mineralization for Highly Efficient Removal of Formaldehyde

Adsorption and kinetic study of Cr(VI) on ZIF-8 based composites

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