Thermodynamic Studies of Chromium Adsorption on Iron Species Generated by Electrocoagulation

Parga, José R.; Vázquez, Víctor; Gonzalez, Gregorio; Cisneros, M.M.

doi:10.1002/ceat.201000186

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…The linear mathematical forms of these isotherm models are summarized in Table S2 in the Supporting Information. The ideal Langmuir model reflects a uniform adsorbent surface and monolayer adsorption on specific homogeneous sites . The empirical Freundlich model represents multilayer adsorption on heterogeneous surfaces .…”

Section: Resultsmentioning

confidence: 99%

Macroporous polystyrene resins as adsorbents for the removal of tetracycline antibiotics from an aquatic environment

Chao

Zhu

Yan

et al. 2014

J of Applied Polymer Sci

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Six macroporous polystyrene resins (strong‐acid resins D001, D061, D072, and NKC‐9, strong‐base resin D201, and alkalescent resin D370) were selected as adsorbents for removing tetracycline (TC) and doxycycline hydrochloride (DC) from aqueous solutions. The solution pH and ionic strength had significant effects on the sorption of TC and DC. The basic resins D201 and D370 exhibited strong sorption capabilities (70.08–105.60 mg/g) at pH 4–9, but strong‐acid resins showed good sorption abilities only under acidic conditions of pH 2–3 (83.30–95.78 mg/g). The inhibitory effect of the ionic strength was much weaker for D370 than for D201. The adsorption ratio of TC and DC on D201 and D370 were all above 90% when the amount of adsorbent exceeded 50 mg. By performing kinetic experiments, we determined that the pseudo‐second‐order model fit the data best for DC sorption on the six resins and TC sorption on D201 and D370, but the pseudo‐first‐order model fit the data of TC sorption on the four strong‐acid resins better at pH 7.0. Intraparticle diffusion was not the only rate‐controlling step, and an initial external mass transfer or chemical reaction might have existed in the sorption process. The Langmuir equation was the best isotherm equation to describe the sorption with a monolayer sorption maximum larger than 98.04 mg/g under all temperatures. Thermodynamic studies showed that the sorption of TC and DC on the resins was thermodynamically feasible and spontaneous. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40561.

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Section: Resultsmentioning

confidence: 99%

Macroporous polystyrene resins as adsorbents for the removal of tetracycline antibiotics from an aquatic environment

Chao

Zhu

Yan

et al. 2014

J of Applied Polymer Sci

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“…(2014) [1][2][3][4][5][6][7][8][9][10][11] www.deswater.com doi: 10.1080/19443994.2014.951692 during the plating process due to "drag-out" from the previous plating baths. The contaminated rinse wastewaters may contain heavy metals, such as chromium, copper, zinc, lead, nickel and iron, depending on the plating process.…”

Section: Desalination and Water Treatmentmentioning

confidence: 98%

“…Unlike many other metals, Cr(VI) in galvanic wastewater must be reduced to the trivalent state Cr(III) for preceding the precipitation process. The most common method used was acidic reduction (pH 2-3) with chemicals namely, sulphur dioxide, sodium sulphite or sodium bisulphate [8]. After chromium reduction, the pH must be raised to 9-10 to precipitate all metals effectively.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

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Treatment of Cr, Ni and Zn from galvanic rinsing wastewater by electrocoagulation process using iron electrodes

Kobya

Erdem

Demirbaş

2015

Desalination and Water Treatment

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A B S T R A C TGalvanizing plants contain reasonable amounts of heavy metal ions which pose a serious risk to humans, animals and the environment. In the present study, removal efficiencies of Cr, Ni and Zn from galvanic rinse wastewater (GRW) by electrocoagulation (EC) process using iron plate electrodes were investigated in a laboratory scale EC reactor. The effects of operational variables, such as operating time (0-50 min), current density (10-40 A/m 2 ), initial pH i (2.4-6.4) and electrode connection modes (MP-P: monopolar-parallel, MP-S: monopolarserial and BP-S: bipolar-serial), on the removal efficiencies of heavy metals were explored to determine the optimum operating conditions. Removal efficiencies of 99.77% for Cr, 85.62% for Ni and 99.04% for Zn at the optimum operating conditions (pH i 5.4, current density of 30 A/m 2 , operating time of 30 min and MP-P electrode connection mode) were obtained. The results showed that Cr, Ni and Zn removal efficiencies from GRW increased with increasing current density and pH at MP-P electrode connection mode. The results showed that EC can effectively reduce metal ions to a very low level. Amount of sludge generated and operating cost at the optimum conditions during the EC process were calculated as 2.32 kg/m 3 and 0.70 €/m 3 . This study revealed that the EC process was very effective for removal of Cr, Ni and Zn from GRW.

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“…24 In addition, H 2 bubbles were generated at the cathode from the reduction of H + (Reaction ( 4)). 25 Cathode:…”

Section: Resultsmentioning

confidence: 99%

One-step Sn4+-based anodic deposition for flattening of fluorine-doped tin oxide enabling large transmittance enhancements

Lee

2013

RSC Adv.

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A novel, facile, one-step Sn 4+ -based anodic deposition method was developed to flatten fluorine-doped tin oxide (FTO) layer, leading to a significant enhancement in visible light transmittances, from 79 to 85%.The Sn 2+ necessary for the anodic deposition of SnO 2 was generated in situ from the starting Sn 4+ such that a slow and balanced deposition and acid-etching of SnO 2 became possible. Furthermore, the fluoride ions released from the acid-etching of the starting FTO layer were later incorporated into the newly deposited SnO 2 to make it fluorine-doped, giving rise to the formation of the conductive, much flattened FTO layer. The flattening of the FTO layer led to a significant light scattering reduction at the FTO-air interface and thus enhanced the light transmittances.

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Thermodynamic Studies of Chromium Adsorption on Iron Species Generated by Electrocoagulation

Cited by 7 publications

References 13 publications

Macroporous polystyrene resins as adsorbents for the removal of tetracycline antibiotics from an aquatic environment

Macroporous polystyrene resins as adsorbents for the removal of tetracycline antibiotics from an aquatic environment

Treatment of Cr, Ni and Zn from galvanic rinsing wastewater by electrocoagulation process using iron electrodes

One-step Sn4+-based anodic deposition for flattening of fluorine-doped tin oxide enabling large transmittance enhancements

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