Mechanisms and Models of Adsorption: TiO<sub>2</sub>-Supported Biochar for Removal of 3,4-Dimethylaniline

Abodif, Ahmed M.; Li, Meng; Ahmed, Sanjrani Manzoor; Ahmed, Abdelaal S. A.; Belvett, Norville; Wei, Zhan Zhi; Du, Ning

doi:10.1021/acsomega.0c00619

Cited by 32 publications

(16 citation statements)

References 42 publications

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“…R L , the Langmuir separation factor, is <1 for all the examined temperatures, pointing to a favorable adsorption isotherm of AV onto biochar surface. 42 In Table 3 , the calculated maximum adsorption from the Langmuir isotherm, q m , was well correlated to the experimental values since the relative error Δ q was very small and insignificant. These emphasize the excellent compatibility of the Langmuir model to the AV adsorption to the biochar.…”

Section: Resultsmentioning

confidence: 62%

“…The monolayer sorption mechanism characterizes the chemisorption processes, which is correlated to increased AV removal with increased temperature. R L , the Langmuir separation factor, is <1 for all the examined temperatures, pointing to a favorable adsorption isotherm of AV onto biochar surface . In Table , the calculated maximum adsorption from the Langmuir isotherm, q m , was well correlated to the experimental values since the relative error Δ q was very small and insignificant.…”

Section: Resultsmentioning

confidence: 68%

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Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies

et al. 2021

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Here, we propose a low-cost, sustainable, and viable adsorbent (pine tree-derived biochar) to remove acid dyes such as acid violet 17 (AV), which is used in the silk dyeing industry. As a case study, the AV removal process was demonstrated using synthetic effluent and further as a proof of concept using real dye effluent produced from the Sirumugai textile unit in India. The pine tree-derived biochar was selected for removal of aqueous AV dye in batch and fixed-bed column studies. The adsorbent material was characterized for crystallinity (XRD), surface area (BET), surface morphology and elemental compositions (SEM–EDX), thermal stability (TGA), weight loss (DGA), and functional groups (FTIR). Batch sorption studies were performed to evaluate (i) adsorption at various pH values (at pH 2 to 7), (ii) isotherms (at 10, 25, and 35 °C) to assess the temperature effect on the sorption efficiency, and (iii) kinetics to reveal the effect of time, adsorbent dose, and initial concentration on the reaction rate. After systematic evaluation, 2 g/L biochar, 25 mg/L AV, pH 3, 40 °C, and 40 and 360 min in a completely mixed batch study resulted in 50 and 90% dye removal, respectively. The isoelectric point at pH 3.7 ± 0.2 results in maximum dye removal, therefore suggesting that monitoring the ratio of different effluent (acid/wash/dye) can improve the colorant removal efficiency. The Langmuir isotherm best fits with the sorption of AV to biochar, provided a maximal dye uptake of 29 mg/g at 40 °C, showing that adsorption was endothermic. Fixed-bed studies were conducted at room temperature with an initial dye concentration of 25 and 50 mg/L. The glass columns were packed with biochar (bed depth 20 cm, pore volume = 14 mL) at an initial pH of 5.0 and a 10 mL/min flow rate for 120 min. Finally, the regeneration of the adsorbent was achieved using desorption studies conducted under the proposed experimental conditions resulted in 90–93% removal of AV even after five cycles of regeneration.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 68%

Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies

et al. 2021

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“…Our current findings are consistent with those of FT-IR bands (34246, 3430, 1642, 1529, 1450, 1134, 1168, 1092, and 469 cm –1 ) of TiO 2 -supported biochar reported by Abodif et al (2020). 25 The FT-IR spectrum of TDO NPs5 at 500 °C is shown in Figure 3 C, with the band at 3383.56 cm –1 being attributed to the stretching vibration of the −OH group, indicating that the NPs are covered with polyphenols. The stretching vibration of titanium metal and oxygen could be assigned to the band at 432.97 cm –1 (Ti–O bond).…”

Section: Resultsmentioning

confidence: 99%

“…(2020). 25 The FT-IR spectrum of TDO NPs5 at 500 °C is shown in Figure 3C, with the band at 3383.56 cm −1 being attributed to the stretching vibration of the −OH group, indicating that the NPs are covered with polyphenols. The stretching vibration of titanium metal and oxygen could be assigned to the band at 432.97 cm −1 (Ti−O bond).…”

Section: Resultsmentioning

confidence: 99%

Biogenic Photo-Catalyst TiO₂ Nanoparticles for Remediation of Environment Pollutants

et al. 2022

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This article reports a benign environmentally friendly fabrication method of titanium dioxide (TDO) nanoparticles (named TDO NPs3, TDO NPs5, and TDO NPs8) using aqueous extract of durva herb waste. This synthesis process avoids use of harmful substances and persistent chemicals throughout the order and enables us to control the size of the nanomaterials. Characterization of TDO nanoparticles was analyzed by ultraviolet–visible spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The morphological nature of the TDO samples was inspected by transmission electron microscopy, which indicated that the TDO NPs3, TDO NPs5, and TDO NPs8 were spherical in shape, with average sizes of 5.14, 12.54, and 29.61 nm, respectively. The stability of TDO nanoparticles was assessed using thermogravimetric analysis and dynamic light scattering analysis. These samples could be used for degradation of polluting industrial textile dyes, such as methylene blue (MB) and rhodamine B (Rh-B). Remarkably, the TDO NPs3 sample (5.14 nm size) exhibits a noticeable degradation of the MB dye in a shorter time period (50 min) than the TDO NPs8 sample with a size of 29.61 nm (120 min). The TDO NPs3 sample was also tested for degradation of Rh-B dye, showing high degradation efficiency over a short period of time (60 min). In contrast, the TDO NPs8 sample showed degradation of the Rh-B dye in 120 min. The effect of the dye concentration and the catalyst dose to remove dye pollutants has also been investigated. The synthesized TDO NPs act as exceptional catalysts for the degradation of dyes, and they are promising materials for the degradation of industrial polluting dyes.

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“…2The movement of Pt(IV) ions into the internals of the PABA polymer (Intra-particle diffusion). 3The adsorption of Pt(IV) ions onto the interior pores of the PABA polymer (Adsorption) [51].…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Sorption of Pt(IV) ions on poly(m-aminobenzoic acid) chelating polymer: Equilibrium, kinetic and thermodynamic studies

2020

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In this work, poly(m-aminobenzoic acid) (PABA) chelating polymer was synthesized and its sorption behaviors for Pt(IV) ions have been investigated. The PABA polymer was prepared by the reaction of m-aminobenzoic acid with ammonium peroxydisulfate. Fourier transform-infrared spectroscopy (FT-IR), thermal analysis (TG and DTA), field emission-scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and surface porosity analytical methods were used in the characterization of the polymer. The FE-SEM images showed that the particles of the synthesized PABA polymer were about 2-10 μm. The PABA polymer is thermally stable up to 320 °C. The zero charge point of the polymer was found at pH 3.50. Batch adsorption experiments were used to examine the effects of pH, initial Pt(IV) concentration, contact time and temperature. The best adsorption values were obtained at pH 4, in which is above the zero charge point of the polymer. The equilibrium, kinetics and thermodynamics of Pt(IV) adsorption on the PABA polymer were examined. The Pt(IV) maximum adsorption capacity of the polymer is 2362 μg/g. The adsorption kinetic data fitted best to pseudo-second order kinetic model. The calculations with intra-particle diffusion and the Elovich models showed that the adsorption was controlled by intra-particle diffusion and chemisorption. The adsorption data fitted well to the Langmuir isotherm. It was found that the adsorption followed the pseudo-second-order kinetic model. In the thermodynamic calculations, the Gibbs free energies (ΔG°: (−10.98)-(−17.38) kJ/mol), the enthalpy (ΔH°:70.07 kJ/ mol) and the entropy (ΔS°: 215.3 kJ/mol) change values of the adsorption were calculated. The column adsorption-desorption and reusability studies of the PABA polymer were also performed. The results showed that Pt(IV) sorption on the PABA polymer is endothermic and chemical adsorption process which is governed by both ionic interaction and chelating mechanisms.

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Mechanisms and Models of Adsorption: TiO₂-Supported Biochar for Removal of 3,4-Dimethylaniline

Cited by 32 publications

References 42 publications

Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies

Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies

Biogenic Photo-Catalyst TiO₂ Nanoparticles for Remediation of Environment Pollutants

Sorption of Pt(IV) ions on poly(m-aminobenzoic acid) chelating polymer: Equilibrium, kinetic and thermodynamic studies

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Mechanisms and Models of Adsorption: TiO2-Supported Biochar for Removal of 3,4-Dimethylaniline

Cited by 32 publications

References 42 publications

Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies

Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies

Biogenic Photo-Catalyst TiO2 Nanoparticles for Remediation of Environment Pollutants

Sorption of Pt(IV) ions on poly(m-aminobenzoic acid) chelating polymer: Equilibrium, kinetic and thermodynamic studies

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Product

Resources

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Mechanisms and Models of Adsorption: TiO₂-Supported Biochar for Removal of 3,4-Dimethylaniline

Biogenic Photo-Catalyst TiO₂ Nanoparticles for Remediation of Environment Pollutants