An efficient and regenerable quaternary amine modified chitosan beads for the removal of nitrate and phosphate anions

Sowmya, Appunni; Meenakshi, Sankaran

doi:10.1016/j.jece.2013.07.031

Cited by 93 publications

(26 citation statements)

References 56 publications

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“…In general, it is obvious that both nitrate and phosphate adsorption processes had ∆G < 0, proving the self-evolution process under standard conditions. On the other hand, the phosphate adsorption was an exothermic process with ∆H < 0 while the nitrate adsorption was an endothermic process with ∆H > 0 [38]. It is known that, with ∆H <40 kJ/mol, the adsorption process is usually considered as physical adsorption.…”

Section: Adsorption Of Nitrate and Phosphate Onto Ferric Oxide-amine mentioning

confidence: 99%

Preparation, Characterization, and Application of Novel Ferric Oxide-Amine Material for Removal of Nitrate and Phosphate in Water

Nguyễn

Lê

Phan

et al. 2020

Journal of Chemistry

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Ferric oxide-amine material was synthesized and applied as a novel adsorbent for nitrate and phosphate removal from aqueous solution. The properties of ferric oxide-amine were examined using TGA, FTIR, BET, SEM, EDX, SEM-mapping, and XRD analysis. The results showed that the adsorption using ferric oxide-amine material reached equilibrium after 30 and 60 min for nitrate and phosphate, respectively. The highest nitrate and phosphate adsorption capacities were 131.4 mg nitrate/g at pH 5-6 and 42.1 mg phosphate/g at pH 6. The effects of adsorbent dosage, initial concentrations of nitrate and phosphate, and adsorption temperature were also investigated. Among the three adsorbents of ferric oxide-amine, ferric oxide, and Akualite A420 ion exchange resin, ferric oxide-amine material had the highest adsorption capacity for nitrate and phosphate removal. These results suggest a great potential use of ferric oxide-amine material for water treatment in practical applications.

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Section: Adsorption Of Nitrate and Phosphate Onto Ferric Oxide-amine mentioning

confidence: 99%

Preparation, Characterization, and Application of Novel Ferric Oxide-Amine Material for Removal of Nitrate and Phosphate in Water

Nguyễn

Lê

Phan

et al. 2020

Journal of Chemistry

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“…The negative Δ H ° indicates that the process of 2‐NAA adsorption on QCHA is exothermic. This is often the case for ion exchange adsorption systems . The relatively low value observed for Δ H ° further suggests that the adsorption process is driven by physical interactions, such as the electrostatic interaction between the negatively charged carboxylate of 2‐NAA and the positively charged quaternary ammonium groups present on QCHA.…”

Section: Resultsmentioning

confidence: 96%

“…Recently, regenerable quaternized chitosan hydrogel adsorbents were developed for the selective removal of inorganic anions from aqueous solution . The authors observed adsorption capacities of 67.5 and 59.0 mg/g toward nitrate and phosphate anions respectively, and their regenerability was demonstrated for more than 10 cycles.…”

Section: Introductionmentioning

confidence: 99%

Removal of 2‐naphthoxyacetic acid from aqueous solution using quaternized chitosan beads

2016

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The present study investigates the use of quaternized chitosan hydrogels for the adsorption of an aromatic organic carboxylate, 2‐naphthoxyacetic acid (2‐NAA), to demonstrate the applicability of this type of adsorbent towards the removal of naphthenic acids (NAs) from oil sands process‐affected water (OSPW). The effects of varying three processing parameters on the physical and adsorption characteristics of the resulting adsorbents were investigated, namely the density, degree of cross‐linking, and degree of quaternization of the hydrogel beads. Their effects on the swelling behaviour and Langmuir adsorption capacity of 2‐NAA were reported. The Langmuir adsorption isotherm provided adequate fit for the equilibrium adsorption data (R2 ≥ 0.99), while the pseudo second order rate equation described the kinetic adsorption data quite well (R2 ≥ 0.95). The effects of adsorbate concentration, adsorbent dosage, agitation rate, ionic strength, pH, and temperature on the adsorption process were also studied. At the initial concentration of approximately 200 mg/L, up to 91 % of 2‐NAA was adsorbed. The best quaternized chitosan hydrogel adsorbents reported in this study possessed a maximum adsorption capacity of 315 mg/g.

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“…Previous reports have demonstrated the effectiveness of chitosan in the uptake of phosphate as well as other oxyanions and metals (e.g. arsenate, arsenite, nitrate, strontium) (Jiang et al 2013;Sowmya and Meenakshi 2013;Kumar and Jiang 2016;Liu et al 2016;Rae et al 2019). The binding capacity of chitosan to P is largely due to amine groups (-NH 2 ) present on the chitosan chain, which can serve as coordination sites for many oxyanions (Fig.…”

Section: Modification and Optimisation Processmentioning

confidence: 99%

Synthesis optimisation and characterisation of chitosan-calcite adsorbent from fishery-food waste for phosphorus removal

Pap

Kirk

Sekulić

et al. 2020

Environ Sci Pollut Res

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Here, Box-Behnken design (BBD) approaches were utilised to optimise synthesis methodology for the chitosan-calcite rich adsorbent (CCM) made from fishery-food waste material (crab carapace), using low-temperature activation and potassium hydroxide (KOH). The effect of activation temperature, activation time and impregnation ratio was studied. The final adsorbent material was evaluated for its phosphorus (P) removal efficiency from liquid phase. Results showed that impregnation ratio was the most significant individual factor as this acted to increase surface deacetylation of the chitin (to chitosan) and increased the number of amine groups (-NH 2 ) in the chitosan chain. P removal efficiency approached 75.89% (at initial P concentration of 20 mg/L) under optimised experimental conditions, i.e. where the impregnation ratio for KOH:carapace (g/g) was 1:1, the activation temperature was 105°C and the activation time was 150 min. Predicted responses were in good agreement with the experimental data. Additionally, the pristine and CCM material were further analysed using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX), Brunauer-Emmett-Teller technique (BET), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermal gravimetric analysis (TGA). Characterisation showed enhancements in surface chemistry (introducing positively charged amine groups), textural properties and thermal stability of the CCM.

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An efficient and regenerable quaternary amine modified chitosan beads for the removal of nitrate and phosphate anions

Cited by 93 publications

References 56 publications

Preparation, Characterization, and Application of Novel Ferric Oxide-Amine Material for Removal of Nitrate and Phosphate in Water

Preparation, Characterization, and Application of Novel Ferric Oxide-Amine Material for Removal of Nitrate and Phosphate in Water

Removal of 2‐naphthoxyacetic acid from aqueous solution using quaternized chitosan beads

Synthesis optimisation and characterisation of chitosan-calcite adsorbent from fishery-food waste for phosphorus removal

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