Removal of p-aminophenol and p-nitrophenol from aqueous solution through adsorption on antimony, cadmium, and zirconium ferrocyanides

Tewari, Brij Bhushan; Boodhoo, Marc V.

doi:10.1016/j.jcis.2005.04.032

Cited by 21 publications

(16 citation statements)

References 32 publications

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“…The second stage includes three steps, the equilibrated adsorption of 4-Nitrophenolate, the addition of hydrogen species to the adsorbed molecule to form the 4-aminophenol via the formation of the 4-hydroxylaminophenol intermediate [16,24], and the removal of two water molecules from the nitro group, and finally the detachment of the 4-aminophenol molecule from the nanoparticle surface to provide place for another catalytic cycle. The adsorption of 4-Nip on the surface of the Pd NPs is reversible and is modeled by a Langmuir isotherm [25]. Previous kinetic studies indicated that the reduction of the 4-Nitrophenol molecule adsorbed on the surface, including the surface hydrogen species, is the rate-determining step [13].…”

Section: Kinetics Analysismentioning

confidence: 99%

Kinetic Analysis of 4-Nitrophenol Reduction by “Water-Soluble” Palladium Nanoparticles

et al. 2020

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The most important model catalytic reaction to test the catalytic activity of metal nanoparticles is the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride as it can be precisely monitored by UV–vis spectroscopy with high accuracy. This work presents the catalytic reduction of 4-nitrophenol (4-Nip) to 4-aminophenol (4-Amp) in the presence of Pd nanoparticles and sodium borohydride as reductants in water. We first evaluate the kinetics using classical pseudo first-order kinetics. We report the effects of different initial 4-Nip and NaBH4 concentrations, reaction temperatures, and mass of Pd nanoparticles used for catalytic reduction. The thermodynamic parameters (activation energy, enthalpy, and entropy) were also determined. Results show that the kinetics are highly dependent on the reactant ratio and that pseudo first-order simplification is not always fit to describe the kinetics of the reaction. Assuming that all steps of this reaction proceed only on the surface of Pd nanoparticles, we applied a Langmuir−Hinshelwood model to describe the kinetics of the reaction. Experimental data of the decay rate of 4-nitrophenol were successfully fitted to the theoretical values obtained from the Langmuir–Hinshelwood model and all thermodynamic parameters, the true rate constant k, as well as the adsorption constants of 4-Nip, and BH4− (K4-Nip and KBH4−) were determined for each temperature.

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Section: Kinetics Analysismentioning

confidence: 99%

Kinetic Analysis of 4-Nitrophenol Reduction by “Water-Soluble” Palladium Nanoparticles

et al. 2020

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“…PNP exists as p-nitro phenolate anion when the solution pH > pKa and as neutral molecule when the solution pH < pKa [26]. Since the pKa of PNP is 7.12, PNP can be adsorbed on the adsorbent surface by electrostatic attraction when the PNP is ionized and by deprotonation or by a weak electrostatic attraction mechanism [27]. This occurs because PNP exists as a neutral molecule since is a weak polar compound [28].…”

Section: Effect Of Ph Of the Solutionmentioning

confidence: 99%

Adsorption of 4-Nitrophenol (PNP) Using Pilli Nut Shell Active Carbon

Nwosu

Adekola²,

Salami³

2017

Pak. J. Anal. Environ. Chem.

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“…Some of the bisphenol derivatives in addition to BPA are reported to exhibit estrogenic activity in human breast cancer cell line MFC-7 or inhibitory effects on the androgenic activity of 5a-dihydrotestrosterone in mouse fibroblast cell line NIH3T3. 35 Chemical procedures such as adsorption, [36][37][38][39][40] nanofiltration, 41 electrochemical polymerization, photolysis, 43,44 photooxidation, 43 or biological procedures by use of microalgae and bacteria 45,46 have been constructed to detoxify or degrade BPA. Alternatively, much attention has been also paid to the potentials of enzymes to catalyze the transformation of phenol compounds.…”

Section: Introductionmentioning

confidence: 99%

Use of chitosan for removal of bisphenol A and bisphenol derivatives through tyrosinase‐catalyzed quinone oxidation

Suzuki¹,

Sugiyama²,

Musashi³

et al. 2010

J of Applied Polymer Sci

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In this study, the availability of chitosan was systematically investigated for removal of bisphenol A (BPA, 2,2-bis(hydroxyphenyl)propane) through the tyrosinase-catalyzed quinone oxidation and subsequent quinone adsorption on chitosan beads. In particular, the process parameters, such as the hydrogen peroxide (H 2 O 2 )-to-BPA ratio, pH value, temperature, and tyrosinase dose, were discussed in detail for the enzymatic quinone oxidation. Tyrosinase-catalyzed quinone oxidation of BPA was effectively enhanced by adding H 2 O 2 and the optimum conditions for BPA at 0.3 mM were determined to be pH 7.0 and 40 C in the presence of H 2 O 2 at 0.3 mM ([H 2 O 2 ]/[BPA] ¼ 1.0). Removal of BPA from aqueous solutions was accomplished by adsorption of enzymatically generated quinone derivatives on chitosan beads. The use of chitosan in the form of beads was found to be more effective because heterogeneous removal of BPA with chitosan beads was much faster than homogeneous removal of BPA with chitosan solutions, and the removal efficiency was enhanced by increasing the amount of chitosan beads dispersed in the BPA solutions and BPA was completely removed by quinone adsorption in the presence of chitosan beads more than 0.10 cm 3 /cm 3 . In addition, a variety of bisphenol derivatives were completely or effectively removed by the procedure constructed in this study, although the enzyme dose or the amount of chitosan beads was further increased as necessary for some of the bisphenol derivatives used.

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Removal of p-aminophenol and p-nitrophenol from aqueous solution through adsorption on antimony, cadmium, and zirconium ferrocyanides

Cited by 21 publications

References 32 publications

Kinetic Analysis of 4-Nitrophenol Reduction by “Water-Soluble” Palladium Nanoparticles

Kinetic Analysis of 4-Nitrophenol Reduction by “Water-Soluble” Palladium Nanoparticles

Adsorption of 4-Nitrophenol (PNP) Using Pilli Nut Shell Active Carbon

Use of chitosan for removal of bisphenol A and bisphenol derivatives through tyrosinase‐catalyzed quinone oxidation

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