Adsorption of chlorophenols from aqueous solution over amino-modified ordered nanoporous silica materials

Ghaffari, Ali; Tehrani, Mohammad Saber; Husain, Syed Waqif; Anbia, Mansoor; Azar, Parviz Aberoomand

doi:10.1007/s40097-014-0114-1

Cited by 42 publications

(14 citation statements)

References 54 publications

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“…It is known that amine groups are effective for the adsorption of organic molecules because of their possible charge association and great adsorption energy. Some examples relate to the adsorption of chlorophenols like 2-chlorophenol (2CPh) and 2,4-dichlorophenol (2,4-DCPh) on a mesoporous silica functionalized by 3-(trimethoxysilyl)propylamine and tetraethylenepentamine (Ghaffari et al 2014). Amino modiefied SBA-15 material was used also as an effective nanosorbent for the removal of halophenols from wastewater (Anbia and Amirmahmoodi 2011).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the SBA-15 materials ability to accumulation of 4-chlorophenol on carbon paste electrode

et al. 2016

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The adsorption of 4-chlorophenol (4-CP) from an aqueous solution on three ordered mesoporous silica materials (commercial unmodified SBA-15-Sigma, synthesized unmodified SBA-15 and amino-functionalized SBA-15-NH 2 ) was studied. The adsorption isotherms were analyzed using the Generalized Langmuir equation taking into account the energetic heterogeneity. The adsorption capacities of the mesoporous silicas increased in order: SBA-15 \ SBA-15-Sigma \ SBA-15-NH 2 . The materials were used for the modification of the carbon paste electrodes (CPEs) for detection of 4-CP based on differential pulse voltammetry. Different parameters that affects the DPV signal such as scan rate, accumulation time and paste composition were investigated. Compared with the bare (graphite) CPE, the SBA-15 modified electrodes greatly increased the oxidation peak current of 4-CP, showing strong signal enhancement effects. The SBA-15-NH 2 modified CPE showed a larger peak current and higher sensitivity for the 4-CP in comparison with the SBA-15 and SBA-15-Sigma modified carbon paste electrodes. The results showed high usefulness of the ordered mesoporous silica materials as an electrode modifiers in the electroanalytical techniques.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the SBA-15 materials ability to accumulation of 4-chlorophenol on carbon paste electrode

et al. 2016

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“…[38] However, the adsorption of organic substances on these adsorbents tends to be low (in terms of Q8) mainly because of the non-specific nature of the binding interactions between the adsorbent and adsorbate. [55] A notable result in this field was reported by Qin et al, [56] who showed that the adsorption of CP on mesoporous SBA-15 (Santa Barbara Amorphous) is increased as the number of chlorine substitutes on the phenol ring is increased. [55] A notable result in this field was reported by Qin et al, [56] who showed that the adsorption of CP on mesoporous SBA-15 (Santa Barbara Amorphous) is increased as the number of chlorine substitutes on the phenol ring is increased.…”

Section: Teos-zn Versus Mesoporous Hybrid Xerogels and Other Adsorbentsmentioning

confidence: 96%

Cation‐assisted adsorption of chlorophenols by nano‐xerogels

et al. 2015

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With water quality deteriorating globally, identification of novel adsorbents for removal of chloroaromatic compounds for wastewater treatment is of growing interest. Classic xerogels produced by drying sol-gels of tetraalkoxy silanes, such as tetramethoxy orthosilane (TMOS) or tetraethoxy orthosilane (TEOS), carry a negative surface charge in water when the pH is higher than the Point of Zero Charge (PZC). This feature was employed in this study to load divalent metal cations on the surfaces of these materials to facilitate chlorophenol (CP) adsorption. Although classic xerogels do not show a high affinity for the adsorption of chlorophenols such as 2-chlorophenol (2CP) in aqueous media, TEOS xerogels loaded with the cations Ni 2þ , Cd 2þ , and Zn 2þ showed 225, 249, and 306 % increases, respectively, in the adsorption of 2CP compared to the unloaded TEOS xerogel. Adsorption of the divalent cations on the xerogels exhibited the order of Zn 2þ > Cd 2þ > Ni 2þ , with maximum adsorption capacities (Q8) of 15.9 and 13 mg/g for Zn 2þ on TEOS and TMOS xerogels, respectively. Using TEOS xerogels loaded with Zn 2þ (TEOS-Zn), adsorption of 2CP, 2,4-dichlorophenol (DCP), and 2,4,6-trichlorophenol (TCP) in aqueous media was studied. The adsorption was found to be spontaneous and obeyed pseudo-second order kinetics, suggesting a chemisorption mechanism between CP and TEOS-Zn. The equilibrium isothermal adsorption data were most closely fitted with a Langmuir equation resulting in Q8 values of 13.9, 9.17, and 8.5 mg/g for 2CP, DCP, and TCP, respectively.

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“…Various physical and chemical treatment techniques such as catalytic oxidation, photocatalytic, membrane separation, biodegradation, solvent extraction and adsorption have been used for the reduce of organic pollutants from water [3,[5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the use of activated carbons is restricted due to their micropore size, weak adsorption selectivity, poor mechanical strength, and inefficient regeneration [9,14].…”

Section: Introductionmentioning

confidence: 99%

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Comparable Study of 4-chlorophenol Removal from Petrochemical Wastewater Using Mesoporous and Microporous Carbons: Equilibrium and Kinetics Investigations

S¹,

Madannejadb²

2016

J Pet Environ Biotechnol

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In this study, an ordered mesoporous carbon structure with excellent adsorption properties towards chlorophenol compounds was synthesized using a hard template. The physico-chemical properties of the synthesized samples were studied using Small Angle X-ray Diffraction (SAXRD), Transmission electron microscopy (TEM), Scanning Electron Microscopy (SEM) and nitrogen adsorption-desorption analysis. The capability of adsorption of 4-chlorophenol on mesoporous carbon has been investigated by varying the reaction time, initial concentration of 4-chlorophenol, adsorbents loading and the pH of the solution; and the results compared with commercial activated carbon as a microporous carbon.Freundlich, Langmuir, Tempkin and dubinin-radushkevich adsorption isotherms were used to model the equilibrium adsorption data for 4-chlorophenol compound. The kinetic analysis showed that the adsorption process was fitted with the pseudo-second-order kinetic model. The equilibrium data were investigated by the main adsorption isotherm models on the mesoporous and microporous carbons as adsorbents, which revealed that the Freundlich model was better to describe the 4-chlorophenol adsorption than other models. Also, the obtained results indicated that the adsorption capacity and equilibrium time for mesoporous carbon were better than microporous carbon, 90 mg/g after 25 minute compare to 60 mg/g after 60 minute, respectively.

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Adsorption of chlorophenols from aqueous solution over amino-modified ordered nanoporous silica materials

Cited by 42 publications

References 54 publications

Evaluation of the SBA-15 materials ability to accumulation of 4-chlorophenol on carbon paste electrode

Evaluation of the SBA-15 materials ability to accumulation of 4-chlorophenol on carbon paste electrode

Cation‐assisted adsorption of chlorophenols by nano‐xerogels

Comparable Study of 4-chlorophenol Removal from Petrochemical Wastewater Using Mesoporous and Microporous Carbons: Equilibrium and Kinetics Investigations

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