Activated carbon catalyzed persulfate oxidation of Azo dye acid orange 7 at ambient temperature

Yang, Shiying; Yang, Xin; Shao, Xianzhao; Niu, Rui; Wang, Leilei

doi:10.1016/j.jhazmat.2010.11.057

Cited by 454 publications

(118 citation statements)

References 57 publications

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“…This increase corresponds to an increase in sulfate radical concentration. However, as the CS/PS ratio was increased to 8, a slight growth in the removal efficiencies of COD and NH3 was achieved, which may be due to the fact that the excessive amount of PS can react with SO4 •− , according to Equation (6) and convert it to sulfate ion [40]. Alternatively, sulfate radicals can react with each other; as a consequence, they have a quenching effect on the sulfate radical production at high concentration, according to Equation (7) [41].…”

Section: Effect Of Converter Sludge Dosage and Ps/cod Mass Ratiomentioning

confidence: 99%

Activation of Persulfate Using an Industrial Iron-Rich Sludge as an Efficient Nanocatalyst for Landfill Leachate Treatment

et al. 2018

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In this research, the performance of nanomaterials obtained from the converter sludge (CS) of Esfahan Steel Company, Iran was investigated for the activation of persulfate (PS). The experiments were conducted on real and synthetic leachates. CS showed high catalytic activity for removal of chemical oxygen demand COD and NH 3 because of its high iron oxide content. The effects of pH, CS dosage, and PS/COD ratio, temperature, and reaction time on the removal of COD and NH 3 were evaluated to optimize operational conditions (pH 2, CS dosage: 1.2 g L −1 , PS/COD: 4, and reaction time: 60 min). Maximum COD and NH 3 removal efficiencies were 73.56 and 63.87%, respectively. Finally, the optimized process was applied for treatment of a real leachate sample. Although the treated leachate was not suitable to discharge into the environment, an increase in the 5-day biochemical oxygen demand (BOD 5 ) and biodegradability (BOD 5 /COD) of leachate after treatment indicated that the effluent can be biologically treated. As a consequence, it can be combined with sewage or can be returned to the landfill.

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Section: Effect Of Converter Sludge Dosage and Ps/cod Mass Ratiomentioning

confidence: 99%

Activation of Persulfate Using an Industrial Iron-Rich Sludge as an Efficient Nanocatalyst for Landfill Leachate Treatment

et al. 2018

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“…The effect of dye concentration Keeping the catalyst loading concentration constant at 800 mg/L of the dye solution, the effect of varying concentration of the dye was studied on its rate of degradation (25,50,75, 100 and 125 ppm) as given in Fig.5. The rate of photodegradation was decreased with increasing concentration of RB.…”

Section: ) Effect Of Concentration Of Dyementioning

confidence: 99%

Comparative Photocatalytic Degradation of Rose Bengal Dye under Visible Light by TiO2, TiO2/PAni and TiO2/PAni/GO Nanocomposites

Kumar¹,

Pandey²

2018

IJRASET

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“…The kinetics of oxidative decolorization of acid orange-7 (hereafter abbreviated as dye) with CAB has been investigated spectrophotometrically at several initial concentrations of the reactants in HClO 4 3; R 2 = 0.9990) was found to be 0.48, indicating a fractional-order dependence of rate on [RuCl 3 ]. The dielectric constant of the medium was varied using different amounts of methanol and H 2 O (0-30 % v/v).…”

Section: Kinetic Ordersmentioning

confidence: 99%

“…Oxidation decolorization is considered a simple and economic technology for the removal of dyestuffs from wastewater. Though there are many reports in literature on the oxidative decolorization of this dye [3][4][5], similar studies have not yet been carried out by keeping its kinetic and mechanistic aspects. The chemistry of organic N-haloamines is of great interest due to their diverse behavior [6].…”

Section: Introductionmentioning

confidence: 99%

RuCl3 Catalyzed and Uncatalyzed Oxidative Decolorization of Acid Orange 7 Dye with Chloramine-B in Acid Medium: Spectrophotometric, Kinetic and Mechanistic Study

Manjunatha

Puttaswamy

2015

Catal Lett

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Acid orange 7, chemically known as sodium 4-[(2E)-2-(2-oxonaphthalen-1-ylidene)hydrazinyl]benzenesulfonate, is extensively used for dyeing textiles, paper and leather. The discharge of wastewater containing this dye, causes environmental and health related problems. Therefore, in the present research, we have developed optimum conditions for the facile oxidative decolorization of this dye with sodium N-chlorobenzenesulfonamide or chloramine-B (CAB). The kinetics and mechanism of oxidative decolorization of acid orange 7 dye with CAB in acidic medium have also been studied spectrophotometrically at 303 K in the presence and absence of RuCl 3 catalyst. Under similar experimental conditions, the reaction exhibits a first-order dependence of rate each on [CAB] o and [dye] o , and an inverse-fractional-order dependence on [H ? ] for both the RuCl 3 catalyzed and uncatalyzed reactions. The order with respect to RuCl 3 is fractional. Activation parameters have been computed. Dielectric effect is negative in both the cases. Oxidation products of the acid orange 7 dye are identified as 1,2-naphthoquinone and benzenesulfonic acid by GC-MS data. The RuCl 3 catalyzed reaction is about four fold faster than the uncatalyzed reaction. The chemical oxygen demand value of the dye was determined. The mechanistic pathways and kinetic modelings have been computed based on experimental results. The developed oxidative decolorization method is expected to be helpful to treat acid orange 7 dye present in wastewater after suitable modifications.Graphical Abstract The stoichiometry of the reaction is in the mole ratio of 1:1(AO7:CAB) in both the cases as shown given below

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Activated carbon catalyzed persulfate oxidation of Azo dye acid orange 7 at ambient temperature

Cited by 454 publications

References 57 publications

Activation of Persulfate Using an Industrial Iron-Rich Sludge as an Efficient Nanocatalyst for Landfill Leachate Treatment

Activation of Persulfate Using an Industrial Iron-Rich Sludge as an Efficient Nanocatalyst for Landfill Leachate Treatment

Comparative Photocatalytic Degradation of Rose Bengal Dye under Visible Light by TiO2, TiO2/PAni and TiO2/PAni/GO Nanocomposites

RuCl3 Catalyzed and Uncatalyzed Oxidative Decolorization of Acid Orange 7 Dye with Chloramine-B in Acid Medium: Spectrophotometric, Kinetic and Mechanistic Study

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