Equilibrium and heat of adsorption of diethyl phthalate on heterogeneous adsorbents

Zhang, Weimin; Xu, Zhaoyi; Pan, Bingcai; Hong, Changhong; Jia, Kun; Jiang, Peijuan; Zhang, Qingjian; Pan, Bingjun

doi:10.1016/j.jcis.2008.05.030

Cited by 56 publications

(21 citation statements)

References 33 publications

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“…This behavior is in agreement with the FTIR results discussed above, suggesting that the adsorption mechanism should not be electrostatic, as usually reported in the literature for several dyes using different adsorbents [3,5,7,10,44]. Otherwise, the adsorption should takes place by the interaction of the dye with the aromatic rings of the activated carbon [43]. This behavior is very important from the removal point of view, since there is no need for pH adjustments for removing the BG dye using CAC and CPAC adsorbents.…”

Section: Effects Of Acidity On Adsorptionsupporting

confidence: 92%

“…Bands ranging from 1620 to 1400 and 1689 to 1395 cm À1 before and after absorption, respectively are assigned to C --C of aromatic rings. The shifts of these bands to lower wavenumbers after the adsorption of the dye indicate that the mechanism of interaction of the BG dye with the activated carbon CPAC should also occur by the p-p interaction of the dye with the aromatic rings of the activated carbon [43], besides the interaction with its functional groups (carboxylate, OH). In addition, strong bands of 1105 and 1098 cm À1 , before and after adsorption, respectively, confirm the presence of C-O bond (Fig.…”

Section: Isotherm Model Equationmentioning

confidence: 99%

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Removal of Brilliant Green Dye from Aqueous Solutions Using Home Made Activated Carbons

Calvete

Lima

Cardoso

et al. 2010

CLEAN Soil Air Water

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Activated carbon materials were prepared from the Brazilian pine-fruit shell (Araucaria angustifolia) by chemically activated carbon (CAC) and chemically and physically activated carbon (CPAC), and tested as adsorbents for the removal of brilliant green (BG) dye from aqueous effluents. The mixed activation process leads to increases in the specific surface area, average porous volume, and average porous diameter of the adsorbent CPAC when compared to CAC. The effects of shaking time, adsorbent dosage and pH on the adsorption capacity were studied. BG uptake was favorable at pH values ranging from 2.0 to 10.0 for both CAC and CPAC. The contact time required to obtain the equilibrium using CAC and CPAC as adsorbents was 4 h at 298 K, respectively. The fractionary-order kinetic model provided the best fit to experimental data compared with other models. Equilibrium data were better fit to the Sips and Redlich-Peterson isotherm models using CAC and CPAC as adsorbents. The enthalpy and entropy of adsorption of BG were obtained from adsorption experiments ranging from 298 to 323 K. IntroductionDyes are a kind of organic compound with a complex aromatic molecular structure that can bring bright and firm color to other substances. However, the complex aromatic molecular structures of dyes make them more stable and more difficult to biodegrade [1,2]. The extensive use of dyes in different kinds of industries often poses pollution problems in the form of colored wastewater discharged into environmental water bodies [3].The most efficient method for the removal of synthetic dyes from aqueous effluents is the adsorption procedure [4][5][6]. This process transfers the dye species from the water effluent to a solid phase thereby keeping the effluent volume to a minimum [7][8][9]. Subsequently, the adsorbent can be regenerated or stored in a dry place without direct contact with the environment [5][6][7][8][9].Activated carbon is the most employed adsorbent for toxic species removal from aqueous effluents because of well-developed pore structures and a high internal surface area that leads to its excellent adsorption properties [10,11]. Besides these physical characteristics, the adsorption capacity is also dependent on the source of organic material employed for the production of the activated carbon [10][11][12][13], as well as the experimental conditions employed in the activation processes [11].Activated carbon can be prepared using a variety of chemical [14] and physical [15] activation methods and in some cases using a combination of both types of methods [16]. Chemical activation is the process where the carbon precursor material is firstly treated with aqueous solutions of dehydrating agents such as H 3 PO 4 , ZnCl 2 , H 2 SO 4 , and KOH. Afterward, the carbon material is dried at 373-393 K to eliminate the water. In a subsequent step, the chemically treated carbon material is heated between 673 and 1073 K under nitrogen atmosphere [11,17]. The physical activation consists of a thermal treatment of previously carbonize...

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Section: Effects Of Acidity On Adsorptionsupporting

confidence: 92%

Section: Isotherm Model Equationmentioning

confidence: 99%

Removal of Brilliant Green Dye from Aqueous Solutions Using Home Made Activated Carbons

Calvete

Lima

Cardoso

et al. 2010

CLEAN Soil Air Water

View full text Add to dashboard Cite

show abstract

“…Comparing the present results with those of AC-750 and XAD-4 [27], the a value of HJ-01 resin and AC-750 is notably greater than that of XAD-4, implying that the surface nature of HJ-01 resin and AC-750 is more heterogeneous than XAD-4. This may be from the different driving forces for the adsorbates adsorbed onto the three adsorbents.…”

Section: Surface Energy Heterogeneity Of Hj-01 Resinsupporting

confidence: 53%

Adsorption properties of a microporous and mesoporous hyper-crosslinked polymeric adsorbent functionalized with phenoxy groups for phenol in aqueous solution

Huang

2009

Journal of Colloid and Interface Science

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“…Comparing the present results with those of AC-750 and XAD-4, the a value of HJ-02 resin and AC-750 is notably greater than that of XAD-4 [37], implying that the surface character of HJ-02 resin and AC-750 is more heterogeneous than XAD-4. This may be from the different driving forces for the adsorbates adsorbed onto the three adsorbents.…”

Section: Surface Energy Heterogeneity Of Hj-02 Resinsupporting

confidence: 53%

Synthesis, characterization, and adsorption properties of phenolic hydroxyl group modified hyper-cross-linked polymeric adsorbent

Huang

Wang

Deng

2009

Journal of Colloid and Interface Science

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Equilibrium and heat of adsorption of diethyl phthalate on heterogeneous adsorbents

Cited by 56 publications

References 33 publications

Removal of Brilliant Green Dye from Aqueous Solutions Using Home Made Activated Carbons

Removal of Brilliant Green Dye from Aqueous Solutions Using Home Made Activated Carbons

Adsorption properties of a microporous and mesoporous hyper-crosslinked polymeric adsorbent functionalized with phenoxy groups for phenol in aqueous solution

Synthesis, characterization, and adsorption properties of phenolic hydroxyl group modified hyper-cross-linked polymeric adsorbent

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