Chromate Ion Adsorption onto Nanostructured Mn–Fe Oxide: Kinetics and Equilibrium Study

Kupeta, Albert J. K.; Naidoo, Eliazer Bobby; Ofomaja, Augustine E.

doi:10.1007/978-3-030-20283-5_16

Cited by 4 publications

(7 citation statements)

References 36 publications

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“…This effect is more pronounced for the CNC-MNP nanocomposite in comparison to the CPC-MNP nanocomposite. The modest shifts in the peaks of CPC-MNPs and CNC-MNPS nanocomposites at about 1261 to 1226 cm −1 in the identical IR spectra are due to the production of carboxylic acids and aldehyde groups in the process of in situ integration of MNPs [42]. Peaks between 1649 and 1634 cm −1 of MNPs, CPC-MNPs, and CNC-MNPs were caused by O-H bending caused by adsorbed water [43].…”

Section: Molecular Structures Of the Mnps Cpc-mnps And Cnc-mnps Nanoc...mentioning

confidence: 92%

Structural Features of Cellulose and Cellulose Nanocrystals via In Situ Incorporation of Magnetic Iron Oxide Nanoparticles: Modification and Characterization

et al. 2022

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This work reports on the structural modification of cellulosic materials with magnetic iron oxide nanoparticles through the co-precipitation method. Cellulose is one of the most abundant natural polymers with chemical variability brought about by the presence of several hydroxyl groups, allowing its surface modifications through the insertion of several chemical groups to impact its cellulosic characteristics. Thus, the objective of this study was to synthesize magnetic iron oxide nanoparticles (MNPs) through co-precipitation, followed by in situ incorporation of MNPs onto chemically purified cellulose (CPC) and cellulose nanocrystals (CNC). The composites were characterized for thermal properties using TGA, molecular structure using FTIR, surface morphology using SEM, elemental composition using electron dispersion spectroscopy (EDS), and crystallinity using XRD. The prepared composites presented improved crystal, thermal, and surface properties. CNC-MNPs and CPC-MNPs bore particle sizes of 26.94 and 37.72 nm, respectively, whereas MNPs’ particle size was 10.3 nm. EDS analysis indicated that Fe, C, and Cl were the main elements present in the composites. Surface modification of the cellulosic materials presented excellent sorption surface properties and can be used in several industrial processes, such as wastewater purification, air filtration, and various environmental remediation processes.

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Section: Molecular Structures Of the Mnps Cpc-mnps And Cnc-mnps Nanoc...mentioning

confidence: 92%

Structural Features of Cellulose and Cellulose Nanocrystals via In Situ Incorporation of Magnetic Iron Oxide Nanoparticles: Modification and Characterization

et al. 2022

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“…Adsorption experiments were done by shaking 0.125 g of peanut shell-based polyurethane type rigid foam with 25 ml-dye solution at 130 rpm. Shaking process was performed in a temperature-controlled water bath at various initial dye concnetrations (10, 20, 50, 75, 100 and 150 mg l -1 ), pH values (3, 5, 7 and 9) and temperatures (20,30,40,50, and 60°C) at early specified times, respectively. After shaking times, the mixtures were then centrifuged at 5000 rpm for 5 min.…”

Section: Methodsmentioning

confidence: 99%

“…For example, phenolated wood resin 19 have been used for the adsorption of various metals. Polyurethane crosslinked pine cone biomas 20 has been utilized for 2-nitrophenol adsorption. has been utilized for dye adsorption.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of safranin-O dye by peanut shell-based polyurethane type foam

Acemioğlu¹,

Bilir²,

Alma³

2018

International Journal of Chemistry and Technology

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The adsorption of safranin-O dye was performed in batch and continuous column sysytems by polyurethane-type rigid foam produced from peanut shell. In batch system, effects of contact time, initial dye concentration, solution pH and temperature on the adsorption were investigated. In column system, solution flow rate and initial dye concentration effect were studied. Under conditions studied, the adsorption of safranin-O was 95-99% for batch system, and 93-99% for column system. Adsorption isotherm best followed the Langmuir model (R 2 = 0.986). Adsorption kinetics was in consistent with best the pseudo-second order model (R 2 values ≥ 0.998). Adsorption was of sponteneous nature and in favor of increasing temperature (i.e. endothermic nature). For example, when the temperature was increased from 20 to 60C, standard Gibbs free energy change (ΔG) dereased regularitly from-5303 to-8170 J mol-1. The values of standard enthalpy (ΔH) and standard entropy (ΔS) were estimated as 13.35 kJ mol-1 and 0.64 kJ mol-1 K-1 , respectively. Moreover, FTIR and SEM analyses were done, and the results were interpreated in detail.

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“…The presence of nitro-group on the ring's made it have the ability to remove electrons, 2-NP is not positively charged at the low pH of the solution. Even though the pH of the solution is lower than 4, 2-NP will engage hydrophobically and form hydrogen bonds with oxygenated groups that have lone electron pairs in the adsorbents when combined with the OH of the aromatic rings [7]. When the OH molecule is hydrogen bridge free, the expected rotation barrier is between (16.98-17.8) kJ/mol; if the NO 2 molecule is involved in a single hydrogen bond, the calculated rotation barrier is about 69 kJ/mol; and if the nitro molecule is simultaneously involved in two hydrogen bonds, the predicted rotation barrier is 93.3 kJ/mol.…”

Section: Introductionmentioning

confidence: 99%

Density Function Theory Study of the Physicochemical Characteristics of 2-nitrophenol

HAMAD,

OBAID KAREEM,

KAYGILI

2023

Journal of Physical Chemistry and Functional Materials

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2-Nitrophenol (2-NP) is utilized in the production of bio-refractory organic compounds, and petrochemicals, and in the synthesis of many drugs and weed killers. The chemical structure of 2-NP is C6H5NO3. The structure of 2-NP is important as the nitro group (NO2. In this present investigation, the Gaussian 5.0 program was used to compute the difference in energy level that exists between the HOMO and LUMO states of the BGs.This information was then used to optimize the shape of the 2-NP structures using DFT methods. The 3-21G/B3LYP base set has a minimum value for the BG energy of 3.48 eV. This is the minimum value that can be achieved. The DOS for 2-NP was measured to have its maximum possible value of 2.23 ev/atom. According to the results of the IR, and Raman spectrum, the C-H stretching vibration peak for 2-NP was found to be between 3208.96 cm-1 and 3243.76 cm-1. The maximum excitation energy was analyzed at a wavelength of 382.1 nm, and the oscillator strength was determined at 0.0537 UV Spectroscopy. In the potential energy map (PE), the colors are changed from blue to red in the range of -4.442e-2 to 4.442e-2.

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Chromate Ion Adsorption onto Nanostructured Mn–Fe Oxide: Kinetics and Equilibrium Study

Cited by 4 publications

References 36 publications

Structural Features of Cellulose and Cellulose Nanocrystals via In Situ Incorporation of Magnetic Iron Oxide Nanoparticles: Modification and Characterization

Structural Features of Cellulose and Cellulose Nanocrystals via In Situ Incorporation of Magnetic Iron Oxide Nanoparticles: Modification and Characterization

Adsorption of safranin-O dye by peanut shell-based polyurethane type foam

Density Function Theory Study of the Physicochemical Characteristics of 2-nitrophenol

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