Removal of azo-dye Acid Red B (ARB) by adsorption and catalytic combustion using magnetic CuFe2O4 powder

Wu, Rongcheng; Qu, Jiuhui; He, Hong; Yu, Yunbo

doi:10.1016/j.apcatb.2003.09.006

Cited by 151 publications

(47 citation statements)

References 19 publications

(17 reference statements)

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“…Adsorption decreased drastically when the pH value was above 5.5 and the adsorption reduced to negligible levels at pH 10. This result is similar to previous reports (Bandara et al, 1999;Wu et al, 2004). However, for the composite, the increase of pH value does not significantly decrease the removal of AO7 when the pH value is below 7.0.…”

Section: Adsorption Kineticssupporting

confidence: 92%

“…However, the catalysis ability of only activated carbon is limited. CuFe 2 O 4 has good catalytic activity (Wu et al, 2004) and its presence could greatly catalyze this azo dye's decomposition. In order to obtain insights into the reaction process, degradation of AO7 on activated carbon and the composite was investigated by means of in situ DRIFT spectroscopy.…”

Section: Ftir Spectra For Ao7 On the Composite And Its Catalytic Degrmentioning

confidence: 99%

“…Recently, considerable attention has been focused on the application of magnetic separation technology to solve environmental problems. Examples of this technology are the use of polymer-coated magnetic particles for oil spill remediation (Orbell et al, 1977;Machado et al, 2006), magnetite particles to accelerate the coagulation of sewage (Booker et al, 1991), magnetic CuFe 2 O 4 powder to adsorb azo-dye Acid Red B (Wu et al, 2004), and magnetic powder MnO-Fe 2 O 3 composite for the adsorption of organic dyes (Wu et al, 2005). However, most of these materials have the drawbacks of small adsorption capacity and narrow application range.…”

Section: Introductionmentioning

confidence: 99%

“…For example, CuFe 2 O 4 powder and MnO-Fe 2 O 3 composite could only be used to adsorb ionic organic pollutants. In addition, the applicable pH range of these materials was relatively narrow (Wu et al, 2004(Wu et al, , 2005.…”

Section: Introductionmentioning

confidence: 99%

“…High adsorption capacity and excellent catalytic activity CuFe 2 O 4 /activated carbon magnetic composites were prepared by a chemical coprecipitation method. Copper ferrite was chosen as the magnetic particle because it can easily be obtained by chemical coprecipitation and has high catalytic activity (Wu et al, 2004), which will facilitate catalytic regeneration of activated carbon saturated with organic contaminants.…”

Section: Introductionmentioning

confidence: 99%

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CuFe2O4/activated carbon composite: A novel magnetic adsorbent for the removal of acid orange II and catalytic regeneration

et al. 2007

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CuFe 2 O 4 /activated carbon magnetic adsorbents, which combined the adsorption features of activated carbon with the magnetic and the excellent catalytic properties of powdered CuFe 2 O 4 , were developed using a simple chemical coprecipitation procedure. The prepared magnetic composites can be used to adsorb acid orange II (AO7) in water and subsequently, easily be separated from the medium by a magnetic technique. CuFe 2 O 4 /activated carbon magnetic adsorbents with mass ratio of 1:1, 1:1.5 and 1:2 were prepared. Magnetization measurements, BET surface area measurements, powder XRD and SEM were used to characterize the prepared adsorbents. The results indicate that the magnetic phase present is spinel copper ferrite and the presence of CuFe 2 O 4 did not significantly affect the surface area and pore structure of the activated carbon. The adsorption kinetics and adsorption isotherm of acid orange II (AO7) onto the composites at pH 5.2 also showed that the presence of CuFe 2 O 4 did not affect the adsorption capacity of the activated carbon. The thermal decomposition of AO7 adsorbed on the activated carbon and the composite was investigated by in situ FTIR, respectively. The results suggest that the composite has much higher catalytic activity than that of activated carbon, attributed to the presence of CuFe 2 O 4 . The variation of the adsorption capacity of the composites after several adsorption-regeneration cycles has also been studied.

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Section: Adsorption Kineticssupporting

confidence: 92%

Section: Ftir Spectra For Ao7 On the Composite And Its Catalytic Degrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CuFe2O4/activated carbon composite: A novel magnetic adsorbent for the removal of acid orange II and catalytic regeneration

et al. 2007

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Metal Oxide Nanomaterials for Water Treatment

Fei

2009

Nanotechnologies for the Life Sciences

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In today's world, nanotechnology is becoming increasingly popular for water treatment. In this chapter, we will summarize recent advances in the development of typical metal oxide materials (TiO 2 , Fe 3 O 4 /Fe 2 O 3 , MnO 2 , CeO 2 , MgO and Al 2 O 3 ) and the related processes for the treatment of various water resources which have been contaminated by organic solutes, inorganic anions, radionuclides, bacteria and viruses.

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Self‐Assembled 3D Flowerlike Iron Oxide Nanostructures and Their Application in Water Treatment

et al. 2006

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3D nanostructures have attracted much attention because of their unique properties and potential applications. [1][2][3][4][5][6][7][8][9][10][11][12][13] The simplest synthetic route to 3D nanostructures is probably selfassembly, in which ordered aggregates are formed in a spontaneous process.[2] However, it is still a big challenge to develop simple and reliable synthetic methods for hierarchically selfassembled architectures with designed chemical components and controlled morphologies, which strongly affect the properties of nanomaterials. Iron oxides have been extensively studied in diverse fields including catalysis, [14][15][16] environment protection, [17][18][19][20][21][22][23] sensors, [24] magnetic storage media, [25] and clinical diagnosis and treatment. [26] Various iron oxide structures, such as nanocrystals, [27][28][29] particles, [30,31] cubes, [32] spindles, [33] rods, [34,35] wires, [36] tubes, [37] and flakes, [38] have been successfully fabricated by a variety of methods. However, the self-assembly of these low-dimensional building blocks into complex 3D ordered nanostructures is still considerably more difficult. In order to further understand the mechanism of self-organization and expand the applications of iron oxide nanomaterials, self-assembled iron oxide 3D nanostructures need to be explored in more detail. Herein, we report the synthesis of novel 3D flowerlike iron oxide nanostructures by an ethylene glycol (EG)-mediated self-assembly process. Such a method has been adopted previously for the preparation of V 2 O 5 hollow microspheres, [7] SnO 2 nanowires, [39,40] and cobalt alkoxide disk-shaped particles.[41] However, in these previous studies, expensive metal organic compounds including acetates, oxalates, or acetylacetonates were used as metal-ion sources; in this study we used ferric chloride, an inexpensive and nontoxic reagent, as our iron source. By calcination at an elevated temperature, the assynthesized iron oxide precursor was transformed into iron oxide. The phase of the final product could easily be controlled to be either a-Fe 2 O 3 , c-Fe 2 O 3 , or Fe 3 O 4 , three of the most common iron oxides, simply by altering the calcination conditions. All of the products maintained their original flowerlike morphology. The reaction mechanism leading to the iron oxide precursor and the self-assembly process are discussed. As an example of potential applications, the as-obtained iron oxide nanomaterials were used as adsorbent in waste-water treatment, and showed an excellent ability to remove various water pollutants. In a typical procedure, ferric chloride (FeCl 3 ·6 H 2 O), urea, and tetrabutylammonium bromide (TBAB) were dissolved in EG. The solution was refluxed at ca. 195°C for 30 min. After cooling, the as-synthesized iron oxide precursor was collected as a green precipitate by four centrifugation and ethanolwashing cycles. The morphology of the precursor was studied by scanning electron microscopy (SEM). Figure 1a shows the SEM image of a typical sample composed of many un...

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Removal of azo-dye Acid Red B (ARB) by adsorption and catalytic combustion using magnetic CuFe2O4 powder

Cited by 151 publications

References 19 publications

CuFe2O4/activated carbon composite: A novel magnetic adsorbent for the removal of acid orange II and catalytic regeneration

CuFe2O4/activated carbon composite: A novel magnetic adsorbent for the removal of acid orange II and catalytic regeneration

Metal Oxide Nanomaterials for Water Treatment

Self‐Assembled 3D Flowerlike Iron Oxide Nanostructures and Their Application in Water Treatment

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