Removal of p-Nitrophenol by Adsorption with 2-Phenylimidazole-Modified ZIF-8

Zhao, Yuzheng; Yuan, Pei‐Qing; Xu, Xinru; Yang, Jingyi

doi:10.3390/molecules28104195

Cited by 8 publications

(7 citation statements)

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“…Figure displays the XRD images of ZIF-8-PhIm and ZIF-8. ZIF-8-PhIm has the same characteristic peaks of ZIF-8 . The spectra of ZIF-8-PhIm and ZIF-8 were essentially identical at 7.3° (011), 10.4° (002), 12.7° (112), 14.7° (022), 16.4° (013), and 18.0° (222), indicating that the backbone of ZIF-8 was preserved after the substitution of 2-methylimidazole with 2-phenylimidazole …”

Section: Resultsmentioning

confidence: 99%

“… (a) N 2 adsorption and desorption isotherms of ZIF-8-PhIm and ZIF-8, (b) pore size distribution of ZIF-8-PhIm and ZIF-8, (c) FT-IR images of ZIF-8-PhIm and ZIF-8, (d) contact angles of ZIF-8-PhIm and ZIF-8, 27 and (e) ζ-potential of ZIF-8-PhIm and ZIF-8. …”

Section: Resultsmentioning

confidence: 99%

“…From the analysis of the 1 H NMR spectrum of ZIF-8-PhIm, it can be obtained that 2-methylimidazole was partially substituted by 2-phenylimidazole in ZIF-8 (Figure 4). 27 For ZIF-8-PhIm, the signal of the CH�CH proton in 2methylimidazole was observed at 7.19 ppm. The key signals for the neighbor substitution proton (2′,6′) and the imidazole aromatic proton (4,5) of 2-phenylimidazole were observed at 7.73 and 7.38 ppm, confirming the substitution of 2methylimidazole by 2-phenylimidazole during SALE.…”

Section: Dynamic Adsorptionmentioning

confidence: 99%

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Removal of Phosphate by Adsorption with 2-Phenylimidazole-Modified Porous ZIF-8: Powder and Chitosan Spheres

Zhao

Yuan

et al. 2023

ACS Omega

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Due to rapid socioeconomic development, increased phosphorus concentrations can cause eutrophication of water bodies, with devastating effects on environmental sustainability and aquatic ecosystems. In this study, ZIF-8-PhIm was prepared for phosphorus removal using 2-phenylimidazole via the solvent-assisted ligand exchange (SALE) method. The structure and composition of ZIF-8-PhIm were characterized by various methods, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), and Brunauer−Emmett−Teller (BET) analysis. Compared to the ZIF-8 material, it exhibited a multistage pore structure with larger pore capacity and pore size, increased hydrophilicity, exposure of more adsorption sites, and also stronger electrostatic interaction. Under optimized conditions (T = 298 K, C 0 = 150 mg/L, dose = 0.2 g/ L), the adsorption capacity of ZIF-8-PhIm reached 162.93 mg/g, which was greater than that of the ZIF-8 material (92.07 mg/g). The Langmuir isotherm and pseudo-second-order kinetic models were suitable for describing the phosphate adsorption of ZIF-8-PhIm. The main effects of ZIF-8-PhIm on phosphate adsorption were Zn−O−P bonding and electrostatic interactions. It also had good regeneration properties. The ZIF-8-PhIm/CS spheres were prepared using chitosan (CS) as the cross-linking agent. The results of dynamic adsorption experiments on the spheres showed a saturation capacity of 85.69 mg/g and a half-penetration time of 514.15 min at 318 K according to the fitted results.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Dynamic Adsorptionmentioning

confidence: 99%

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Removal of Phosphate by Adsorption with 2-Phenylimidazole-Modified Porous ZIF-8: Powder and Chitosan Spheres

Zhao

Yuan

et al. 2023

ACS Omega

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“…Various catalytic materials for the reduction of p-nitrophenol to p-aminophenol have been recently reported and have very good results both in terms of conversion and catalyst regeneration [43][44][45][46][47][48][49][50][51].…”

Section: Discussionmentioning

confidence: 99%

Emulsion Liquid Membranes Based on Os–NP/n–decanol or n–dodecanol Nanodispersions for p–Nitrophenol Reduction

Pîrțac,

Nechifor,

Tanczos

et al. 2024

Preprint

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Materials based on platinum metals with very good catalytic activity were tested in the reduction of p–nitrophenol (pNP) to p–aminophenol (pAP). The majority of presented catalytic materials are based on the adsorption of p–nitrophenol on the surface of the catalyst simultaneously with molecular hydrogen, coming from sodium borohydride in an aqueous medium, which reduces it. In the present paper, a catalytic material based on osmium dispersed in n–decanol or n–dodecanol is presented, which also works as an emulsion membrane, for the absorption of p–nitrophenol and molecular hydrogen at the n–alcohol aqueous solution interface. The hydrogenation of p–nitrophenol is carried out in a reaction and separation column in which the acid receiving phase emulsion is dispersed in the osmium nanodispersion, in n–alcohols. This emulsion circulates from the base of the column to its upper part in co-current or counter-current with the source phase consisting of p–nitrophenol and sodium borohydride. Experiments show that the circulation of counter-current phases is superior to that in co-current, and the emulsion based on n–decanol is more efficient than the one based on n–dodecanol. The increase in the pH difference between the source and receiving phases leads to the increase in the conversion of p–nitrophenol to p–aminophenol. The efficiency of separation of the reaction product in the receiving phase is lower than the conversion at the same operating time. The apparent catalytic rate constant (kapp) of the new catalytic material based on the emulsion membrane with nanodispersion of osmium nanoparticles (0.1×10−3 for n–dodecanol and 0.9×10−3 for n-decanol) is lower by an order of magnitude compared to those based on adsorption on catalysts from platinum metal group. The advantage of the tested membrane catalytic material is that it extracts p–aminophenol in the acid receiving phase. The paper proposes a mechanism of the studied reduction system.

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“…In addition, its accumulation and residue in the environment may irritate eyes and skin, damage the liver, kidney and nervous system, and even cause chromosomal aberrations or blood disorders in humans [22]. Many strategies have been proposed for the degradation of p-NP, such as adsorption [23], microbial degradation [24], photocatalytic degradation [25], electrochemical methods [26] and chemical reduction [27]. Compared with other techniques, the catalytic reduction of p-NP to p-aminophenol (p-AP) by an excess NaBH 4 aqueous solution is one of the most feasible and simple methods due to its high efficiency and facile operating conditions [28].…”

Section: Introductionmentioning

confidence: 99%

Influence of Co3O4 Nanostructure Morphology on the Catalytic Degradation of p-Nitrophenol

Chen,

Yang,

Liu

et al. 2023

Molecules

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The design and fabrication of nanomaterials with controllable morphology and size is of critical importance to achieve excellent catalytic performance in heterogeneous catalysis. In this work, cobalt oxide (Co3O4) nanostructures with different morphologies (nanoplates, microflowers, nanorods and nanocubes) were successfully constructed in order to establish the morphology–property–performance relationship of the catalysts. The morphology and structure of the nanostructured Co3O4 were characterized by various techniques, and the catalytic performance of the as-prepared nanostructures was studied by monitoring the reduction of p-nitrophenol to p-aminophenol in the presence of excess NaBH4. The catalytic performance was found to be strongly dependent on their morphologies. The experimental results show that the pseudo-first-order reaction rate constants for Co3O4 nanostructures with various shapes are, respectively, 1.49 min−1 (nanoplates), 1.40 min−1 (microflowers), 0.78 min−1 (nanorods) and 0.23 min−1 (nanocubes). The Co3O4 nanoplates exhibited the highest catalytic activity among the four nanostructures, due to their largest specific surface area, relatively high total pore volume, best redox properties and abundance of defect sites. The established correlation between morphology, property and catalytic performance in this work will offer valuable insight into the design and application of nanostructured Co3O4 as a potential non-noble metal catalyst for p-nitrophenol reduction.

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Removal of p-Nitrophenol by Adsorption with 2-Phenylimidazole-Modified ZIF-8

Cited by 8 publications

References 50 publications

Removal of Phosphate by Adsorption with 2-Phenylimidazole-Modified Porous ZIF-8: Powder and Chitosan Spheres

Removal of Phosphate by Adsorption with 2-Phenylimidazole-Modified Porous ZIF-8: Powder and Chitosan Spheres

Emulsion Liquid Membranes Based on Os–NP/n–decanol or n–dodecanol Nanodispersions for p–Nitrophenol Reduction

Influence of Co3O4 Nanostructure Morphology on the Catalytic Degradation of p-Nitrophenol

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