Amine-Functionalized Titanosilicates Prepared by the Sol−Gel Process as Adsorbents of the Azo-Dye Orange II

Marçal, Liziane; Faria, Emerson H. de; Saltarelli, Michelle; Calefi, Paulo S.; Nassar, Eduardo J.; Ciuffi, Kátia J.; Trujillano, Raquel; Vicente, M.A.; Korili, S.A.; Gil, Antonio

doi:10.1021/ie101650h

Cited by 38 publications

(18 citation statements)

References 25 publications

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“…The amount of dye adsorbed at time t was calculated from the following equation [7,16,27]:

q_{t} = \frac{(C_{i} - C_{t}) V}{m}

where, q t is the amount of dye adsorbed at time t (mg·g −1 ), C i the initial dye concentration in liquid phase (mg·L −1 ), C t the liquid-phase dye concentration at time t (mg·L −1 ), V the volume of dye solution (L) and m the mass of the adsorbent (g). Finally, the adsorption rate was calculated using the following equation [48]:

Adsorption rate (%) = \frac{C_{i} - C_{t}}{C_{i}} \times 100

…”

Section: Methodsmentioning

confidence: 99%

Adsorption of Azo-Dye Orange II from Aqueous Solutions Using a Metal-Organic Framework Material: Iron- Benzenetricarboxylate

et al. 2014

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A Metal-Organic Framework (MOF), iron-benzenetricarboxylate (Fe(BTC)), has been studied for the adsorptive removal of azo-dye Orange II from aqueous solutions, where the effect of various parameters was tested and isotherm and kinetic models were suggested. The adsorption capacities of Fe(BTC) were much higher than those of an activated carbon. The experimental data can be best described by the Langmuir isotherm model (R2 > 0.997) and revealed the ability of Fe(BTC) to adsorb 435 mg of Orange II per gram of adsorbent at the optimal conditions. The kinetics of Orange II adsorption followed a pseudo-second-order kinetic model, indicating the coexistence of physisorption and chemisorption, with intra-particle diffusion being the rate controlling step. The thermodynamic study revealed that the adsorption of Orange II was feasible, spontaneous and exothermic process (−25.53 kJ·mol−1). The high recovery of the dye showed that Fe(BTC) can be employed as an effective and reusable adsorbent for the removal of Orange II from aqueous solutions and showed the economic interest of this adsorbent material for environmental purposes.

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“…The amount of dye adsorbed at time t was calculated from the following equation [7,16,27]:

q_{t} = \frac{(C_{i} - C_{t}) V}{m}

Adsorption rate (%) = \frac{C_{i} - C_{t}}{C_{i}} \times 100

…”

Section: Methodsmentioning

confidence: 99%

Adsorption of Azo-Dye Orange II from Aqueous Solutions Using a Metal-Organic Framework Material: Iron- Benzenetricarboxylate

et al. 2014

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“…The homogeneous Fenton process consists basically in the oxidation of Fe 2+ to Fe 3+ species mediated by H 2 O 2 under acid conditions to generate highly reactive OH • radicals . Besides iron, other transition metals frequently adopting several intermediate oxidation states were also found to be active, although with less efficiency …”

Section: Introductionmentioning

confidence: 99%

Reactivity of ceria–zirconia catalysts for the catalytic wet peroxidative oxidation of azo dyes: reactivity and quantification of surface Ce(IV)‐peroxo species

Hamoud

Azambre

Finqueneisel

2015

J of Chemical Tech & Biotech

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BACKGROUND: Doping nanoceria with zirconia often leads to improved catalytic properties due to enhanced concentration of structural defects in the resulting materials. This study aims to identify the parameters and mechanisms governing the reactivity of well-characterized commercial ceria-zirconia (Ce x Zr 1-x O 2 ) nanocatalysts with various Ce contents (x = 1, 0.80, 0.50, 0.21, 0) or surface area towards the degradation of Orange II dye in the presence of H 2 O 2 . RESULTS: Discoloration and mineralization kinetics were found to be strongly related both to the composition and surface area of the single or mixed oxides. Under standard conditions (23 ∘ C, dark, stoichiometric concentration in H 2 O 2 ), the best discoloration and mineralization performances were achieved for pure ceria (100% of color removal in 2 h and 65% mineralization in 8 h), but this arises mainly from its higher specific area by comparison with Zr-doped materials.For the first time, the amount of Ce IV (O 2 ) 2− surface species, intermediates in the production of hydroxyl radicals and generated from the reaction of H 2 O 2 with Ce(III) sites, was quantitated using TPD-MS in order to provide a rational basis to explain the catalytic performance. CONCLUSION: Doping ceria with Zr increases the surface density of defective Ce(III) sites that can be converted to Ce IV (O 2 ) 2− species in the presence of H 2 O 2 , but other parameters, such as the specific surface area and surface Ce content of the catalysts, are also important. An in-depth mechanism for the reaction of H 2 O 2 on the ceria-zirconia surface is discussed based on the experimental results.

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“…Currently, dyes are widely used in many industrial applications, including textiles, printing, plastics, food, leather and papermaking, among others [1] – [4] . In China, large amounts of dye wastewater are directly discharged into natural water courses without treatment, particularly in the rural area of China [5] .…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Application of Magnetic Fe3O4-CS for the Adsorption of Orange I from Aqueous Solutions

Pei

et al. 2014

PLoS ONE

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Fe3O4 (Fe3O4-CS) coated with magnetic chitosan was prepared as an adsorbent for the removal of Orange I from aqueous solutions and characterized by FTIR, XRD, SEM, TEM and TGA measurements. The effects of pH, initial concentration and contact time on the adsorption of Orange I from aqueous solutions were investigated. The decoloration rate was higher than 94% in the initial concentration range of 50–150 mg L−1 at pH 2.0. The maximum adsorption amount was 183.2 mg g−1 and was obtained at an initial concentration of 400 mg L−1 at pH 2.0. The adsorption equilibrium was reached in 30 minutes, demonstrating that the obtained adsorbent has the potential for practical application. The equilibrium adsorption isotherm was analyzed by the Freundlich and Langmuir models, and the adsorption kinetics were analyzed by the pseudo-first-order and pseudo-second-order kinetic models. The higher linear correlation coefficients showed that the Langmuir model (R2 = 0.9995) and pseudo-second-order model (R2 = 0.9561) offered the better fits.

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Amine-Functionalized Titanosilicates Prepared by the Sol−Gel Process as Adsorbents of the Azo-Dye Orange II

Cited by 38 publications

References 25 publications

Adsorption of Azo-Dye Orange II from Aqueous Solutions Using a Metal-Organic Framework Material: Iron- Benzenetricarboxylate

Adsorption of Azo-Dye Orange II from Aqueous Solutions Using a Metal-Organic Framework Material: Iron- Benzenetricarboxylate

Reactivity of ceria–zirconia catalysts for the catalytic wet peroxidative oxidation of azo dyes: reactivity and quantification of surface Ce(IV)‐peroxo species

Preparation, Characterization and Application of Magnetic Fe3O4-CS for the Adsorption of Orange I from Aqueous Solutions

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