Adsorption of phenolic contaminants from water on activated carbon: An insight into single and multicomponent adsorption isotherms

Shukla, Pradeep; Chong, Siewhui; Pan, Guan‐Ting; Wang, Shaobin; Ang, Ming; Rudolph, Victor

doi:10.1002/apj.2372

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…In the Freundlich model, the sequence for the values of K f is 7N-Vt > 5N-Vt > 8N-Vt, under the same temperature, indicating the strongest adsorption performance of 7N-Vt toward 2-NP and BPB. In the R-P model, the closer values of g to 1 verifies the multilayer arrangement of 2-NP during the whole adsorption process [ 28 ]. The adsorbed BPB molecules prefer to be arranged as s monolayer form in the interlayer of organo-Vts, as indicated by the close values of g to 0.…”

Section: Resultsmentioning

confidence: 99%

Organo-Vermiculites Modified by Aza-Containing Gemini Surfactants: Efficient Uptake of 2-Naphthol and Bromophenol Blue

Gong

Wang²,

Zhang³

et al. 2022

Nanomaterials

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To explore the effect of spacer structure on the adsorption capability of organo-vermiculites (organo-Vts), a series of aza-containing gemini surfactants (5N, 7N and 8N) are applied to modify Na-vermiculite (Na-Vt). Large interlayer spacing, strong binding strength and high modifier availability are observed in organo-Vts, which endow them with superiority for the adsorption of 2-naphthol (2-NP) and bromophenol blue (BPB). The maximum adsorption capacities of 5N-Vt, 7N-Vt and 8N-Vt toward 2-NP/BPB are 142.08/364.49, 156.61/372.65 and 146.50/287.90 mg/g, respectively, with the adsorption processes well fit by the PSO model and Freundlich isotherm. The quicker adsorption equilibrium of 2-NP than BPB is due to the easier diffusion of smaller 2-NP molecules into the interlayer space of organo-Vts. Moreover, stable regeneration of 7N-Vt is verified, with feasibility in the binary-component system that is demonstrated. A combination of theoretical simulation and characterization is conducted to reveal the adsorption mechanism; the adsorption processes are mainly through partition processes, electrostatic interaction and functional interactions, in which the spacer structure affects the interlayer environment and adsorptive site distribution, whereas the adsorbate structure plays a role in the diffusion process and secondary intermolecular interactions. The results of this study demonstrate the versatile applicability of aza-based organo-Vts targeted at the removal of phenols and dyes as well as provide theoretical guidance for the structural optimization and mechanistic exploration of organo-Vt adsorbents.

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Section: Resultsmentioning

confidence: 99%

Organo-Vermiculites Modified by Aza-Containing Gemini Surfactants: Efficient Uptake of 2-Naphthol and Bromophenol Blue

Gong

Wang²,

Zhang³

et al. 2022

Nanomaterials

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“…adsorption [11][12][13][14][15][16], biological degradation [17], persulfate-based AOPs [18], photocatalytic oxidation [8,19], electrochemical treatment [20,21], Fenton and ultrasound-Fenton oxidation [3,22,23], ozonation [24,25], and ultraviolet photolysis [26]. Among these technologies, adsorption has been recognized as one of the most promising and dependable approaches for the removal of low-concentration pollutants from wastewaters in consideration of its relatively low cost, facile operation and maintenance, high removal efficiency, and easy integration with wastewater treatment plants [27] and is widely used in the removal of phenols and other emerging contaminants in waters [12,27]. Activated carbon is the most commonly used sorbent because of its vast surface area and great affinity for organics.…”

Section: Introductionmentioning

confidence: 99%

“…Activated carbon is the most commonly used sorbent because of its vast surface area and great affinity for organics. A number of studies have used it as the adsorbent for the removal of phenols and substituted phenols [12,28,29]. Although activated carbon is effective for the removal of pollutants from wastewaters, it is very costly.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Adsorption Performance of Chitosan to Phenol Derivatives through Hydrophobic Modification: Kinetics, Equilibrium, and Mechanisms

li¹,

wang²,

huo³

et al. 2022

Preprint

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Adsorption is effective methods to remove trace organic pollutants in water, and the development of cheap and efficient adsorption materials is essential to the real application of this technique. In this study, chitosan, a natural aminopolysaccharide, was grafted with palmityl chloride using an acylation procedure to improve its hydrophobicity and adsorption capacity to hydrophobic organic contaminants. A hydrophobically-modified chitosan (HMC2) was characterized using Fourier transform infrared spectroscopy (FTIR), and then was tested to adsorb phenolic pollutants from water. The batch adsorption experiments were employed to investigate the adsorption equilibrium and kinetics of 4-nonylphenol(4-NP), α-naphthol(Nap), 4-chlorophenol(4-CP) and phenol(Phe) on HMC2 and chitosan. The effect of temperature, salt concentration, and pH on adsorption was studied for the understanding of adsorption processes. Moreover, a linear free energy relationship approach and FTIR technique were used to identify the predominant adsorption mechanisms. The obtained results showed that the modified chitosan had higher adsorption capacity to 4-NP, Nap, 4-CP and Phe than the unmodified one. The adsorption kinetics of 4-NP, Nap and 4-CP on chitosan and HMC2 were found to be well fitted by the first-order kinetic model. The adsorption isotherms of 4-NP, Nap, 4-CP and Phe on HMC2 conformed to the linear or Freundlich models. The pH range from 5.6-8.5 appeared to have non-significant effect on the adsorption capacity of HMC2. However, the increasing salt concentration was found to favor the adsorption. The adsorption enthalpy changes (ΔH0) for 4-NP, Nap and CP on HMC2 varied from -3.82 to -0.44 kJ/mol, and the adsorption entropy changes (ΔS0) changed from 21.7 to 85.9 J/(mol·K). When the logarithms of the distribution constant (logKd) were correlated with the logarithms of the octanol-water partition coefficient (logKow), a good linear relationship was observed:logKd=1.451·logKow - 4.893 (r2=0.999). Thus, the hydrophobic interaction was proposed as a predominant mechanism for adsorption of nonionized 4-NP, Nap, 4-CP, and Phe on HMC2, which was further confirmed by the FTIR data. This study may provide guidance for tailoring high-performance chitosan to selectively remove organic pollutants in water.

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Adsorption: a reliable solution for emerging contaminants removal

Sharifian,

Asasian-Kolur

2024

Traditional and Novel Adsorbents for Antibiotics Removal From Wastewater

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Adsorption of phenolic contaminants from water on activated carbon: An insight into single and multicomponent adsorption isotherms

Cited by 10 publications

References 35 publications

Organo-Vermiculites Modified by Aza-Containing Gemini Surfactants: Efficient Uptake of 2-Naphthol and Bromophenol Blue

Organo-Vermiculites Modified by Aza-Containing Gemini Surfactants: Efficient Uptake of 2-Naphthol and Bromophenol Blue

Enhancing the Adsorption Performance of Chitosan to Phenol Derivatives through Hydrophobic Modification: Kinetics, Equilibrium, and Mechanisms

Adsorption: a reliable solution for emerging contaminants removal

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