Activated carbon/iron oxide composites for the removal of atrazine from aqueous medium

Castro, Cínthia S.; Guerreiro, Mário César; Gonçalves, Maraísa; Oliveira, Luiz C.A.; Anastácio, Alexandre S.

doi:10.1016/j.jhazmat.2008.08.066

Cited by 160 publications

(70 citation statements)

References 21 publications

(14 reference statements)

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“…The MnFe 2 O 4 content, magnetization measurement, BET surface area and pore volumes of the pure activated carbon and the prepared composites were listed in Table 1 [18,20,29,30].…”

Section: Characterization Of the Compositesmentioning

confidence: 99%

Facile synthesis, characterization of a MnFe2O4/activated carbon magnetic composite and its effectiveness in tetracycline removal

Shao

Ren

Zhang

et al. 2012

Materials Chemistry and Physics

181

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a b s t r a c tIn this study, MnFe 2 O 4 /activated carbon magnetic composites with mass ratio of 1:1, 1:1.5 and 1:2 were synthesized using a simple chemical coprecipitation procedure. A variety of techniques such as X-ray diffractometer, scanning electron microscope, magnetization measurements, BET surface area measurements were used to characterize the structure, morphology and magnetic performance of the prepared composite adsorbents. The results showed that the composites had good magnetic properties, which allowed their convenient magnetic separation from water. Spinel manganese ferrite was found to occur in the magnetic phase and the presence of magnetic particles of MnFe 2 O 4 did not significantly affect the surface area and pore structure of the activated carbon. The magnetic composites were effective for tetracycline (TC) removal from water and the maximal adsorption capacity was 590.5 mmol kg À1 at pH 5.0. The TC adsorption followed pseudo-second-order kinetic model and its removal decreases gradually with an increase in pH value, whereas the removal rate was over 60% even at pH 9.0. The TC adsorption process is endothermic and the increase of temperature is favoring its removal. All these results indicated that the prepared composites had the potential to be used as adsorbents for the removal of TC from water or wastewater.

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“…The MnFe 2 O 4 content, magnetization measurement, BET surface area and pore volumes of the pure activated carbon and the prepared composites were listed in Table 1 [18,20,29,30].…”

Section: Characterization Of the Compositesmentioning

confidence: 99%

Facile synthesis, characterization of a MnFe2O4/activated carbon magnetic composite and its effectiveness in tetracycline removal

Shao

Ren

Zhang

et al. 2012

Materials Chemistry and Physics

181

View full text Add to dashboard Cite

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“…The activated carbon matrix for all samples shows a broad band of nanocrystalline carbon phase at 2θ value of 26.3 with average particle size around 4-7nm: Various major peaks of different broad band nanocrystalline phases were located at 2θ value = 35.5°, 43.13° specified the maghemite (γ-Fe 2 All these diffraction peaks in the XRD pattern confirmed the presence of magnetic nanoparticles. The average particle size of the samples were calculated using Scherrer's equation: [20] …”

Section: Resultsmentioning

confidence: 99%

Insights onto the Adsorption of MFe2O4 Nanoparticles Loaded onto Activated Carbon

Attia¹,

Shouman

El-Khouly

2017

Egypt. J. Chem.

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I N THIS WORK, magnetic nanoparticles of MFe 2 O 4 (M: Fe, Mn, Cu and Co) were prepared on the surface of granular activated carbon throughout the impregnation process, employing HNO 3 acid as the carbon modifying agent. These adsorbents were employed to assess the adsorption capability of p-chlorophenol from aqueous solution. The adsorbents were characterized by XRD, SEM, EDX and nitrogen adsorption isotherms. Additionally, the impact of various parameters such as pH, contact time was investigated. The results demonstrate that the current phase is mainly γ-Fe 2 O 3 (maghemite), spinel manganese, copper and cobalt ferrite, respectively. The equilibrium details were best ascribed by the Langmuir model accompanied by high adsorption capacity of 110mg/g for γ-Fe 2 O 3 / activated carbon. The kinetic experimental analysis of the adsorption model perfectly was correlated to the pseudo -second order kinetics. With the advantages inexpensive and fast processing, these adsorbents could attain promoting application in wastewater treating.

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“…Probably due as the content of iron in the composite increases because the surface area decrease caused by the presence of a high quantity of iron oxide in the activated carbon/Iron oxide occupying the active sites avoiding the contact of atrazine molecules to adsorption sites on the carbon surface [2].…”

Section: The Effect Of Factors On the Atrazine Adsorption Capacities mentioning

confidence: 99%

“…Contamination of water and soil by atrazine has a negative impact on aquatic ecosystems and induce severe hormonal disturbances in amphibians [1]. Thus it is classified as a potential human carcinogenic by USEPA (United States Environmental Protection Agency) and the main source of human exposure is the consumption of contaminated groundwater [2]. Therefore, the European Union legislation allows a very low concentration of atrazine in drinking water (0.1 ppb) and USEPA has also set a maximum contaminant level at 3 ppb for it [3].…”

Section: Introductionmentioning

confidence: 99%

Optimization Study of the Removal of Atrazine from Aqueous Solution on to Composite Activated Carbon-Silver Using Response Surface Methodology

Rachel¹,

Abdelaziz²,

Kouotou³

et al. 2017

MSA

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Activated carbon based oil palm shells were prepared by physical activation using steam which was further grafted with silver. The Response Surface Methodology (Doehlert design) was used to optimize both the impregnation of silver and the atrazine removal. The effects of three variables of preparation conditions of the composite activated Carbon-Silver (AC-Ag): Concentration of silver, impregnation temperature and impregnation time on the atrazine removal (Y 1 ) was investigated on one hand. In another hand, three variables of atrazine removal from liquid phase: Temperature, pH and ratio of Atrazine/CaCl 2 (r(Atraz/CaCl 2 )) on the adsorption capacity of atrazine (Y 2 ) were also investigated. Based on the Doehlert designs, the quadratic models were developed to correlate the preparation variables and the adsorption variables to the response. The optimum conditions of preparation of AC-Ag were found to be: Concentration of silver of 0.063 mol/L, impregnation temperature of 223˚C, impregnation time of 1.3 hand atrazine removal of 384.62 mg/g. The optimum conditions of atrazine adsorption were found to be: Temperature of 25.0˚C, pH of 7.7 and r(Atraz/CaCl 2 ) of 0.37 which gave 209 mg/g of atrazine adsorption capacity. These results demonstrated that the preparation and adsorption conditions have a significant influence on the removal of atrazine.

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Activated carbon/iron oxide composites for the removal of atrazine from aqueous medium

Cited by 160 publications

References 21 publications

Facile synthesis, characterization of a MnFe2O4/activated carbon magnetic composite and its effectiveness in tetracycline removal

Facile synthesis, characterization of a MnFe2O4/activated carbon magnetic composite and its effectiveness in tetracycline removal

Insights onto the Adsorption of MFe2O4 Nanoparticles Loaded onto Activated Carbon

Optimization Study of the Removal of Atrazine from Aqueous Solution on to Composite Activated Carbon-Silver Using Response Surface Methodology

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