Adsorptive removal of methyl orange with polyaniline nanofibers: an unconventional adsorbent for water treatment

Duhan, Monika; Kaur, Raminder

doi:10.1080/09593330.2019.1593511

Cited by 25 publications

(7 citation statements)

References 33 publications

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“…Furthermore, Khattabi et al [ 40 ] also demonstrated the moderate performance of commercially obtained activated carbon with a capacity ( q e ) of 96 mg/g; however, the capacity of PAnAC is seemingly well positioned in the list and surpasses most adsorbents. The adsorption performance of PAn and PAn/metal oxide composites [ 41 , 42 , 43 ] was low (22–111 mg/g) compared to the listed ACs (commercials: 96–267 mg/g; synthetics: 400–482 mg/g) and PAnAC (406 mg/g). Interestingly, the nitrogen-doped AC revealed a better performance than the undoped one, with capacities of 135 and 120 mg/g, respectively, supporting the argument that activated carbons doped with nitrogen are more active, as nitrogen may provide the AC with additional effective N-based functional groups, thus increasing the number of active sites to adsorb ionic substances, including organic dyes.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-Rich Polyaniline-Based Activated Carbon for Water Treatment: Adsorption Kinetics of Anionic Dye Methyl Orange

2023

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In the present work, a nitrogen-rich activated carbon (PAnAC) was prepared using polyaniline (PAn) as a precursor to represent one possible conversion of nitrogen-containing polymeric waste into a valuable adsorbent. PAnAC was fabricated under the chemical activation of KOH and a PAn precursor (in a 4:1 ratio) at 650 °C and was characterized using FTIR, SEM, BET, TGA, and CHN elemental composition. The structural characteristics support its applicability as an adsorbent material. The adsorption performance was assessed in terms of adsorption kinetics for contact time (0–180 min), methyl orange (MO) concentration (C0 = 50, 100, and 200 ppm), and adsorbent dosages (20, 40, and 80 mg per 250 mL batch). The kinetic results revealed a better fit to a pseudo-second-order, specifically nonlinear equation compared to pseudo-first-order and Elovich equations, which suggests multilayer coverage and a chemical sorption process. The adsorption capacity (qe) was optimal (405.6 mg/g) at MO C0 with PAnAC dosages of 200 ppm and 40 mg and increased as MO C0 increased but decreased as the adsorbent dosage increased. The adsorption mechanism assumes that chemisorption and the rate-controlling step are governed by mass transfer and intraparticle diffusion processes.

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Section: Resultsmentioning

confidence: 99%

Nitrogen-Rich Polyaniline-Based Activated Carbon for Water Treatment: Adsorption Kinetics of Anionic Dye Methyl Orange

2023

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“…The study of the chemical structure of PANI and its derivatives POT and POA by infrared spectroscopy (FTIR) before and after the adsorption of the MO dye (Figure 12) provided important information on the mechanism of interaction between dye molecules and functional groups of the adsorbent. 10,47,48 Both polymers show characteristic bands related to the PANI structure. The peaks at 1603 and 1508 cm −1 correspond to vibrations of the C=C bond of the quinoid (Q) and benzenoid (B) rings, respectively, indicating that the structure is in the emeraldine form.…”

Section: The Mechanism Of Mo Dye Adsorption On Pani Pot and Poamentioning

confidence: 99%

Adsorption of anionic methyl orange dye by polyaniline, poly(o‐methylaniline) and poly(o‐methoxyaniline)

Sadykov,

Syakaev,

Andriianova

et al. 2023

Int J of Chemical Kinetics

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This study reports the effect of substituents in the ortho position of polyaniline on the adsorption capacity to remove the anionic dye methyl orange (MO) from an aqueous solution. The aim of this study is the synthesis of polyaniline (PANI) and its derivatives, poly‐o‐methylaniline (poly‐o‐toluidine, POT) and poly‐o‐methoxyaniline (poly‐o‐anisidine, POA) for the adsorption removal of MO dye. All polymers were obtained by oxidative polymerization of the corresponding monomers and characterized by scanning electron microscopy (SEM) and infrared spectroscopy (IR). The average particle size of the polymer was about 200 nm. The effect of various parameters such as pH, temperature, adsorption time and initial concentration was analyzed. It was found that the adsorption capacity for dye removal increases from 50.68 to 222.56 mg g−1 for PANI, from 16.89 to 66.57 mg g−1 for POT, and from 97.26 to 532.54 mg g−1 for POA with an increase in the initial dye concentration from 5 up to 50 mg L−1. For all polymers, the equilibrium state of MO adsorption was reached in 50 min. The results showed that MO adsorption on PANI, POT, and POA is well described by a pseudo second order kinetic model. Isothermal studies have shown that adsorption is in good agreement with the Langmuir isotherm model, as evidenced by higher values of correlation coefficients. Based on the data of thermodynamic studies, it was concluded that MO adsorption on PANI, POT, and POA is spontaneous and endothermic.

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“…For any targeted pollutant removal, the adsorption mechanism is influenced by the adsorbent’s chemical composition, surface area, pore size, and chemical environment . The adsorbent/adsorbate interactions can be very complicated due to the involvement of one or more interactions such as electrostatic interactions, hydrogen bonding, π–π (pi–pi) interaction, complex formation, and precipitation …”

Section: Dye Adsorption Studiesmentioning

confidence: 99%

“…51 The adsorbent/adsorbate interactions can be very complicated due to the involvement of one or more interactions such as electrostatic interactions, hydrogen bonding, π−π (pi−pi) interaction, complex formation, and precipitation. 108 The proposed adsorption mechanism for both dyes is illustrated in Figure 8. Both dyes, that is, BG and MO contain aromatic rings and surficial charge in their structures.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Experimental Insights into Mesoporous Polyaniline-Based Nanocomposites for Anionic and Cationic Dye Removal

Tanweer

Alam

2022

Langmuir

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This work presents the preparation of inorganic–organic hybrid nanocomposites, namely three-dimensional polyaniline (Pani)/activated silica gel (ASG) (3D Pani@ASG), their characterization, and in removing application as a potential adsorbent for cationic brilliant green (BG), crystal violet (CV), and anionic Congo red (CR), and methyl orange (MO) dyes. Pani@ASG nanocomposites have been prepared by the in situ polymerization method and characterized using various techniques such as Fourier transform infrared (FTIR), X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) with selected area electron diffraction, thermogravimetric analysis with derivative thermogravimetry, zeta potential analyses, and Brunauer–Emmett–Teller (BET). The scanning electron microscopy (SEM) study confirms the average particle size of the Pani@ASG nanocomposite is in the range of 5 nm. FESEM, TEM, FTIR, and XRD analysis proved the successful decoration of ASG over Pani. The BET result of Pani@ASG shows a mesoporous nature with a pore diameter of less than 3 nm and a surface area of 423.90 m2 g–1. Both SEM and TEM analyses show the proportional distribution of ASG over Pani’s surface. The adsorption trend of BG and MO on the studied materials at pH 7 was found as follows: Pani@ASG > Pani > ASG. The highest sorption capacities of MO and BG on Pani@ASG were 161.29 and 136.98 mg/g (T = 298.15 K, and Pani@ASG dose: 0.04 g for MO and 0.06 g for BG), which were greater compared with bare Pani and bare ASG, respectively. The interaction mechanism behind the adsorption of BG and MO dyes onto the Pani@ASG nanocomposite includes electrostatic interaction, π–π interaction, and hydrogen bonding. The mechanistic pathway and the interactions between the targeted dyes and Pani@ASG were further studied using adsorption isotherm, adsorption kinetics, and thermodynamics.

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Adsorptive removal of methyl orange with polyaniline nanofibers: an unconventional adsorbent for water treatment

Cited by 25 publications

References 33 publications

Nitrogen-Rich Polyaniline-Based Activated Carbon for Water Treatment: Adsorption Kinetics of Anionic Dye Methyl Orange

Nitrogen-Rich Polyaniline-Based Activated Carbon for Water Treatment: Adsorption Kinetics of Anionic Dye Methyl Orange

Adsorption of anionic methyl orange dye by polyaniline, poly(o‐methylaniline) and poly(o‐methoxyaniline)

Experimental Insights into Mesoporous Polyaniline-Based Nanocomposites for Anionic and Cationic Dye Removal

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