Synthesis of ZIF-8@GO-COOH and its adsorption for Cu(II) and Pb(II) from water: Capability and mechanism

Yang, Wei; Cao, Mingli

doi:10.1016/j.seppur.2022.122957

Cited by 45 publications

(7 citation statements)

References 73 publications

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“…As the dosage of the PAA sponge increased to 6 mg, the removal capacity decreased to 391.5 mg g −1 , while the removal efficiency increased to 94.0%. With the further increase of the dosage to 8 mg, the removal efficiency reached 97.2% with an adsorption capacity of 303.6 mg g −1 , which is much better than previous studies [ 36 , 37 , 38 , 39 ], demonstrating the excellent adsorption performance of the PAA sponge towards Pb(II). It was noteworthy that the PAA sponge could be precipitated from the solution after adsorption due to the neutralization of the surface negative charges, as shown in Figure S7 , which avoided the tedious removal procedures of nano-adsorbents.…”

Section: Resultsmentioning

confidence: 55%

Efficient Removal of Pb(Ⅱ) by Highly Porous Polymeric Sponges Self-Assembled from a Poly(Amic Acid)

et al. 2023

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Lead (II) (Pb(II)) is widespread in water and very harmful to creatures, and the efficient removal of it is still challenging. Therefore, we prepared a novel sponge-like polymer-based absorbent (poly(amic acid), PAA sponge) with a highly porous structure using a straightforward polymer self-assembly strategy for the efficient removal of Pb(II). In this study, the effects of the pH, dosage, adsorption time and concentration of Pb(II) on the adsorption behavior of the PAA sponge are investigated, revealing a rapid adsorption process with a removal efficiency up to 89.0% in 2 min. Based on the adsorption thermodynamics, the adsorption capacity increases with the concentration of Pb(II), reaching a maximum adsorption capacity of 609.7 mg g−1 according to the Langmuir simulation fitting. Furthermore, the PAA sponge can be efficiently recycled and the removal efficiency of Pb(II) is still as high as 93% after five adsorption–desorption cycles. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses reveal that the efficient adsorption of Pb(II) by the PAA sponge is mainly due to the strong interaction between nitrogen-containing functional groups and Pb(II), and the coordination of oxygen atoms is also involved. Overall, we propose a polymer self-assembly strategy to easily prepare a PAA sponge for the efficient removal of Pb(II) from water.

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Section: Resultsmentioning

confidence: 55%

Efficient Removal of Pb(Ⅱ) by Highly Porous Polymeric Sponges Self-Assembled from a Poly(Amic Acid)

et al. 2023

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“…In the case of ZIF-11, the major peaks at 2θ = 6.2°, 8.0°, 9.4°, 14.2°, 17.6°, and 20.4° are related to the (200), (211), (220), (420), (510), and (600) reflections (Figure S1b). It is important to note that ZIF-7 and ZIF-11 when grown over FG multilayers retained the same peak positions as the pristine ZIFs, underlining the structural identities and phase purity. ,, This also sheds light on the submissive templating ability of FG multilayers akin to graphene derivatives, − which provide the skeleton toward the nucleation and growth of ZIF-7 and ZIF-11 networks. However, we cannot rule out the possibility that the solvent and reaction medium (alkaline pH) influence the defluorination/bonding changes of FG multilayers. ,− This prompted us to further examine the functional groups of these samples by FTIR spectroscopy.…”

Section: Resultsmentioning

confidence: 71%

Three in One: Superoleophilic, Chemically and Mechanically Resistant ZIF-7 and ZIF-11 Percolation Networks for Selective Permeation of Oils and Chlorinated Solvents

Prasanthi,

Datta

2023

Inorg. Chem.

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Imbuing superwetting functions to organic−inorganic hybrid networks displaying chemical resistance, self-cleaning ability, and selective permeation of liquids has received increasing attention in recent years. Here we report superhydrophobic ZIF-7 and ZIF-11 on multilayer fluorinated graphene (FG) nanosheets with long-lasting water-repellent features. By exploring the solution processing of these chemically resistant dispersions, superoleophilic FG-ZIF-7 stainless steel mesh (FG-ZIF-7-SSM) and FG-ZIF-11 over cotton cloth (FG-ZIF-11-CC) possessing superior adhesion were fabricated. These permselective oil-liking prototypes were explored toward mesitylene and crude oil pickup from chemically harsh marine conditions such as seawater, acidic water, and alkaline water, with a separation efficiency of 96−94% up to 10 cycles. Furthermore, using an FG-ZIF-11-CC-wrapped glass pipet, upward diffusion of chloroform from sea, acidic, and alkaline water in 45 s was demonstrated with a separation efficacy of 94% up to 20 cycles. In addition to the chemical resistance and reusability, the mechanical stability of FG-ZIF-7-SSM and FG-ZIF-11-CC was investigated through folding, tape peeling, and dragging through sandpaper up to 250 cycles, showing no signs of changes in the hydrophobic responses. This research sheds light on the application of physiochemically resistant percolation coatings based on fluorinated graphene multilayers supporting ZIF-7 and ZIF-11 toward oil/water separation.

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“…The reported adsorption capacities of some other adsorbents for heavy metals are presented in Table for comparison. The precipitate formed during the removal of SO 4 2– clearly shows superior adsorption capacities than that of other adsorbent materials. ,− …”

Section: Resultsmentioning

confidence: 98%

Selective Separation of Sulfate and Chloride Ions from Industrial Wastewater by In Situ Generation of CaFe-Layered Double Hydroxides and the Related Resource Utilization

Diao,

Ma,

Chen

et al. 2023

Ind. Eng. Chem. Res.

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Synthesis of ZIF-8@GO-COOH and its adsorption for Cu(II) and Pb(II) from water: Capability and mechanism

Cited by 45 publications

References 73 publications

Efficient Removal of Pb(Ⅱ) by Highly Porous Polymeric Sponges Self-Assembled from a Poly(Amic Acid)

Efficient Removal of Pb(Ⅱ) by Highly Porous Polymeric Sponges Self-Assembled from a Poly(Amic Acid)

Three in One: Superoleophilic, Chemically and Mechanically Resistant ZIF-7 and ZIF-11 Percolation Networks for Selective Permeation of Oils and Chlorinated Solvents

Selective Separation of Sulfate and Chloride Ions from Industrial Wastewater by In Situ Generation of CaFe-Layered Double Hydroxides and the Related Resource Utilization

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