Removal of <i>p</i>-nitrophenol from simulated sewage using MgCo-3D hydrotalcite nanospheres: capability and mechanism

Gao, Fei; Xu, Xinru; Yang, Jingyi

doi:10.1039/d2ra01883g

Cited by 15 publications

(5 citation statements)

References 55 publications

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“…However, after adsorption, these peaks were shifted towards lower binding energies by 0.41 eV and 0.21 eV, respectively. This suggests that the electrons of the p -nitrophenol overlapped with the external electrons of Zn 2+ , causing an increase in the density of the outer electrons and enhancing the shielding effect [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…Compared to H 2 O, p -nitrophenol is more electronegative, providing Zn with numerous electrons in the vacant orbital. Therefore, in an aqueous solution, the partial water molecule coordinated to Zn of ZIF-8-PhIm (Lewis acid) was displaced by p -nitrophenol (strong Lewis base), thus forming a coordination bond [ 36 , 45 , 46 ]. Table 6 shows the binding energies and relative contents in the O 1s profiles of ZIF-8-PhIm before and after p -nitrophenol adsorption.…”

Section: Resultsmentioning

confidence: 99%

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

Zhao

Yuan

et al. 2023

Molecules

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Petrochemical wastewater contains p-nitrophenol, a highly toxic, bioaccumulative and persistent pollutant that can harm ecosystems and environmental sustainability. In this study, ZIF-8-PhIm was prepared for p-nitrophenol removal from petrochemical wastewater using solvent-assisted ligand exchange (SALE) with 2-phenylimidazole(2-PhIm). The ZIF-8-PhIm’s composition and structure were characterised using the XRD, SEM, FT-IR, 1H NMR, XPS and BET methods. The adsorption effect of ZIF-8-PhIm on p-nitrophenol was investigated with the static adsorption method. Compared to the ZIF-8 materials, ZIF-8-PhIm exhibited stronger π-π interactions, produced a multistage pore structure with larger pore capacity and size, and had increased hydrophilicity and exposure of adsorption sites. Under optimised conditions (dose = 0.4 g/L, T = 298 K, C0 = 400 mg/L), ZIF-8-PhIm achieved an adsorption amount of 828.29 mg/g, which had a greater p-nitrophenol adsorption capacity compared to the ZIF-8 material. The Langmuir isotherm and pseudo-second-order kinetic models appropriately described the p-nitrophenol adsorption of ZIF-8-PhIm. Hydrogen bonding and π-π interactions dominated the p-nitrophenol adsorption of ZIF-8-PhIm. It also had relatively good regeneration properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

Zhao

Yuan

et al. 2023

Molecules

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“…At T = 298 K, C 0 = 150 mg/L, and t = 240 min, the maximum capacity for phosphate adsorption of ZIF-8-PhIm reached 162.93 ± 4.95 mg/g, higher than that of ZIF-8 (92.07 ± 5.90 mg/g) and many previously published ZnO/ZIF-based adsorbents (54.82–147.63 mg/g, Table ). As the temperature increased, the adsorption capacity changed little, but the adsorption rate of ZIF-8-PhIm increased, suggesting that the increase of temperature led to the increase of phosphate thermal movement …”

Section: Resultsmentioning

confidence: 99%

“…As the temperature increased, the adsorption capacity changed little, but the adsorption rate of ZIF-8-PhIm increased, suggesting that the increase of temperature led to the increase of phosphate thermal movement. 35 3.2.3. Effect of pH.…”

Section: Effect Of Initial Concentration and Temperaturementioning

confidence: 99%

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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“…Figure 10 determines a better fit of the adsorption data to the Langmuir model with higher linearity values than the Freundlich model for the LAB and SAB [105]. This model assumes MB adsorption by activated biochars occurs in monolayers and homogeneous sites with the same binding energy [106].…”

Section: Adsmentioning

confidence: 98%

Biochar Derived from Water Hyacinth Biomass Chemically Activated for Dye Removal in Aqueous Solution

Carneiro,

Morais,

de Carvalho Melo

et al. 2023

Sustainability

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Rapid industrial development has led to the use of numerous dyes responsible for significant water pollution worldwide. Adsorbents have been developed to treat these waters, mainly in the form of activated biochar, which has several advantages, one of which is its good surface characteristics, such as high surface area and pore volume. The objective of the investigation was to analyze the efficiency of removing the methylene blue model dye in aqueous solutions through the adsorption process using biochar chemically activated from the leaf and stem of water hyacinth (Eichhornio crassipes) as a bioadsorbent. This study carbonized the stem and leaf containing zinc chloride at 600 °C. The materials were characterized by different techniques and were tested for their ability to adsorb methylene blue. The activated stem and leaf biochars removed approximately 285.71 and 322.58 mg g−1 of the dye, respectively, indicating that the adsorption is more significant in the leaf. Pseudo-second-order kinetics was the most suitable model to describe dye adsorption on biochars, and the experimental isotherm data fit the Langmuir model. It is concluded that the application of activated water hyacinth biochar is a renewable resource with the potential for effluent treatment.

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Removal of p-nitrophenol from simulated sewage using MgCo-3D hydrotalcite nanospheres: capability and mechanism

Abstract: Compared with conventional hydrotalcite materials, MgCo-3D hydrotalcite nanospheres have a larger surface area and more active sites and adsorption capacity.

Cited by 15 publications

References 55 publications

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

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

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

Biochar Derived from Water Hyacinth Biomass Chemically Activated for Dye Removal in Aqueous Solution

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