Comparison of 4-chloro-2-nitrophenol adsorption on single-walled and multi-walled carbon nanotubes

Mehrizad, Ali; Aghaie, Mehran; Gharbani, Parvin; Dastmalchi, Siavoush; Monajjemi, Majid; Zare, Kazem

doi:10.1186/1735-2746-9-5

Cited by 53 publications

(22 citation statements)

References 20 publications

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“…The K ads estimation facilitated the modeling of the nature of P. muellerianus leaf-extract adsorption through use of the K ads for the separation factor, R L , computation in Equation (11) [56,60,65,66]:…”

Section: Adsorption Isotherm Modelingmentioning

confidence: 99%

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Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Okeniyi

Loto

Popoola

2016

Metals

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This paper investigates Phyllanthus muellerianus leaf-extract effects on steel-reinforcement corrosion in concrete immersed in 3.5% NaCl, simulating saline/marine environment. Different concentrations of the leaf-extract were admixed in steel-reinforced concrete samples, which were immersed, with normal control, in the test-environment, while positive control samples were immersed in distilled water. Electrochemical measurements of corrosion-rate (by linear-polarizationresistance instrument), corrosion-current (by zero-resistance-ammeter) and corrosion-potential (by high impedance multimeter) were obtained for assessing the reinforcing-steel corrosion. Analyzed results showed that the corrosion-rate exhibited excellent correlation (R = 98.82%, Nash-Sutcliffe Efficiency = 97.66%, ANOVA p-value = 0.0006) with function of the admixture concentration and of the corrosion noise-resistance (ratio of corrosion-potential and corrosion-current standard deviations). The 0.3333% Phyllanthus muellerianus (per weight of cement) exhibited optimal efficiency, η = 97.58% ± 1.28% (experimental) or 95.33% ± 4.25% (predicted), at inhibiting concrete steel-reinforcement corrosion in the test-environment, which compares well with the positive control performance model, η = 97.96% ± 0.03%. The experimental and predicted models followed the Langmuir adsorption isotherm, which indicated physisorption as the Phyllanthus muellerianus leaf-extract adsorption mechanism on the reinforcing-steel. These support suitability of the N-, S-, and O-containing and π-electron rich Phyllanthus muellerianus leaf-extract as an environmentally-friendly inhibitor for effective corrosion-protection of steel-reinforcement in concrete designed for the saline/marine environment.

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Section: Adsorption Isotherm Modelingmentioning

confidence: 99%

“…The R L computation, therefore, finds usefulness for indicating P. muellerianus leaf-extract adsorption on reinforcing-steel as irreversible if [60,66]. In addition to these, the K ads of the Langmuir isotherm model was used for estimating the Gibbs free energy of adsorption ∆G ads using Equation (12) [56,60,[62][63][64]:…”

Section: Adsorption Isotherm Modelingmentioning

confidence: 99%

Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Okeniyi

Loto

Popoola

2016

Metals

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“…The percentage removal of phenol increased with the increasing absorbent dosage (0.5-4.0 g). It is attributed due to increase in adsorbent surface area and availability of more adsorption sites (Mehrizad et al 2009;Uddin et al 2007). The results also revealed that the adsorption efficiency increases with the increasing dose (Rengaraj et al 2002).…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

Neural network model and isotherm study for removal of phenol from aqueous solution by orange peel ash

et al. 2014

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Artificial Neural Network model and isotherm study were done to predict the removal efficiency of phenol. An inexpensive adsorbent was developed from orange peel ash (OPA) for effective uptake of phenol from aqueous solution. The influence of different experimental parameters (initial concentration, pH, adsorbents dose, contact time, stirring rate and temperature) on phenol uptake efficiency was evaluated. Phenol was adsorbed by the OPA up to maximum of 97.34 %. Adsorption of phenol on OPA correlated well with the Langmuir isotherm model, implying monolayer coverage of phenol onto the surface of the adsorbent. The maximum adsorption capacity was found to be 3.55 mg g -1 at 303 K. Pseudo-second-order kinetic model provided a better correlation for the experimental data. Moreover, the activation energy of the adsorption process (E a ) was found to be -18.001 kJ mol -1 indicating physorption nature of phenol onto OPA. A negative enthalpy (DH°) value indicated that the adsorption process was exothermic. Again multi-layer Neural Network model was in very good agreement with the experimental results.

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“…Among these methods, adsorption has been developed as a simple and cheap method to treat phenolic compounds. Various adsorbents such as bentonite [15], sawdust [16], activated carbon [17], nano-titanium dioxide [18], and carbon nanotubes [19] have been tested for adsorption of phenol and its compounds from aqueous solutions. Among them, carbon materials show significant adsorption yields.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, development of suitable methods for the decontamination of phenols is necessary. Research has studied the removal of phenol from aqueous solutions, including advanced oxidation processes [5,6], biological degradation [7,8], ozonation [9,10], adsorption [11][12][13][14] [19] have been tested for adsorption of phenol and its compounds from aqueous solutions. Among them, carbon materials show significant adsorption yields.…”

mentioning

confidence: 99%

Decontamination of 4-Chloro-2-Nitrophenol from Aqueous Solution by Graphene Adsorption: Equilibrium, Kinetic, and Thermodynamic Studies

Mehrizad¹,

Gharbani²

2014

Pol. J. Environ. Stud.

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Phenol and its compounds are one of the major materials commonly used in the petrochemical, coking, coal refining, chemical, and pharmaceutical industries [1,2]. The harmful effects due to the presence of phenols in industrial wastewaters have been confirmed [3,4]. Thus, development of suitable methods for the decontamination of phenols is necessary. Research has studied the removal of phenol from aqueous solutions, including advanced oxidation processes [5,6], biological degradation [7,8], ozonation [9,10], adsorption [11][12][13][14] [19] have been tested for adsorption of phenol and its compounds from aqueous solutions. Among them, carbon materials show significant adsorption yields. This may be because of their large surface area and good distribution of pore size. Therefore, using new carbonaceous materials as adsorbents is interesting for scientists. An example of a new carbonaceous material is graphene, whose atoms are arranged in a 2D honeycomb structure [20]. As literature results show, graphene has a high adsorption capacity for removal of aqueous pollutants [21][22][23][24][25].In the present study, the potential application of graphene for 4-chloro-2-nitrophenol (4C2NP) adsorption Pol. J. Environ. Stud. Vol. 23, No. 6 (2014), 2111-2116 Original (4C2NP) is an important chemical widely used in the pharmaceuticals, herbicide, and pesticide industries. The ability of graphene to remove 4C2NP from aqueous solutions was performed as a function of contact time, amounts of adsorbent, pH, initial 4C2NP concentrations, and temperatures using a batch technique. Based on the results, the amount of 4C2NP adsorption increased with increasing initial concentration, whereas the alkaline pH range, higher graphene dosage, and higher temperature were unfavorable. Non-linear regression methods suggest that the isotherm data can be well described by the Freundlich isotherm equation. The adsorption kinetic data were analyzed using the non-linear rate equations of pseudo-first and pseudo-second order. It was found that the pseudo-second-order kinetic model was the most appropriate model, describing the adsorption kinetics. The observed changes in the standard Gibbs free energy (ΔGº), standard enthalpy (ΔHº), and standard entropy (ΔSº) show that the adsorption of 4C2NP by graphene is feasible, spontaneous, and exothermic in the temperature range 298-328 K.

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Comparison of 4-chloro-2-nitrophenol adsorption on single-walled and multi-walled carbon nanotubes

Cited by 53 publications

References 20 publications

Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Neural network model and isotherm study for removal of phenol from aqueous solution by orange peel ash

Decontamination of 4-Chloro-2-Nitrophenol from Aqueous Solution by Graphene Adsorption: Equilibrium, Kinetic, and Thermodynamic Studies

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