Degradation and mineralization of Calcon using UV365/H2O2 technique: Influence of pH

Sahoo, M.K.; Sinha, B.; Marbaniang, M.; Naik, D.B.

doi:10.1016/j.desal.2011.07.015

Cited by 26 publications

(12 citation statements)

References 47 publications

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“…But 254 nm light is not environmentally relevant because light of wavelengths below 290 nm reaching the earth is minimal (Sahoo et al 2011). As pointed out by Goslich et al (1997), the sun produces 0.2-0.3 mol photons at 1 m 2 /h in the range of 300-400 nm near the earth's surface with a typical UV flux of 20-30 W/m 2 .…”

Section: Introductionmentioning

confidence: 99%

Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

Lin

Lee

Hsu

2013

Int. J. Environ. Sci. Technol.

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This investigation evaluates the effectiveness of UV-365 nm/S 2 O 8 2-process in degrading polyvinyl alcohol in aqueous solutions. The effects of pH, Na 2 S 2 O 8 dosage, and temperature on the degradation efficiency of polyvinyl alcohol were studied. Under acidic conditions, the degradation efficiency of polyvinyl alcohol exceeded that under alkaline conditions. Additionally, a higher Na 2 S 2 O 8 dosage and a higher temperature were associated with a higher degradation efficiency of polyvinyl alcohol. The degradation rates of polyvinyl alcohol followed a pseudo-first-order kinetic model. Moreover, the observed degradation rate coefficient increased from 0.0078 to 0.4081 min -1 when the temperature was increased from 10 to 55°C. Also, the activation energy estimated using the observed degradation rate coefficients and the Arrhenius equation was 64 kJ/mol. At UV-365 nm, pH 3, an Na 2 S 2 O 8 dosage of 0.06 g/L, a temperature of 55°C, and an initial polyvinyl alcohol concentration of 20 mg/L, around 100 % of polyvinyl alcohol was degraded, indicating that UV-365 nm/S 2 O 8 2-process has great potential in degrading polyvinyl alcohol in aqueous solutions.

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Section: Introductionmentioning

confidence: 99%

Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

Lin

Lee

Hsu

2013

Int. J. Environ. Sci. Technol.

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“…1. Mineralization studies were carried out by measuring the total organic carbon (TOC) of the samples with a TOC analyzer (Elementar Analysensysteme GmbH, Model: Liqui TOC II) using the procedure described before [16]. All the analyses were carried out immediately after the reaction and the reproducibility in TOC measurement was checked by frequent measurement of the standard (1:1 solution of potassium phthalate and sodium carbonate as TOC and total inorganic carbon standard, respectively) as suggested by the manufacturer, and the errors were always found to be within ±5%.…”

Section: Methodsmentioning

confidence: 99%

“…(4) and (5)) [19]. It is expected that mineralization of CCA would proceed through the formation of HNO 3 , H 2 SO 4, and aliphatic acids such as muconic acid, maleic acid, fumaric acid, acetic acid, oxalic acid, and formic acid [16]. Thus, the pH of the solution after treatment is expected to decrease.…”

Section: Effect Of Phmentioning

confidence: 97%

Metal ion-catalyzed mineralization and biodetoxification studies of Calconcarboxylic acid in aqueous solution: effect of –COOH group

Sahoo

Sinha

Sharan

2015

Desalination and Water Treatment

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A B S T R A C TMineralization and biodetoxification studies of Calconcarboxylic acid (CCA), an azo dye, were undertaken by metal ion-catalyzed oxidation processes, viz. Fenton and Fenton-like processes and the effect of presence of -COOH group thereon were established. The metal ions used were Fe 2+ and Ag + and the oxidants used were hydrogen peroxide (HP) and ammonium persulfate (APS). For a given oxidant, Fe 2+ is found to be the most suitable catalyst and among the oxidants, APS proves to be most suitable one. As all the systems yield maximum mineralization at pH 1, Fe 2+ /APS at pH 1 is the most suitable system. It is observed that mineralization is favored by Fe 2+ /HP process due to the presence of -COOH group in CCA and by Fe 2+ /APS process in its absence. Removal of -COOH group causes a shift in optimum pH, for Fenton process, to 3 accompanied by a corresponding drop in mineralization from 70.6 to 35.6% and an increase from 73.2 to 91.1% in Fe 2+ /APS system. Bioassay experiment reveals that the treated solutions are ≥50% biotoxic than the untreated dye, which could be reduced to 22.7 and 26.7% in Fe 2+ /APS and Ag + /APS systems, respectively, when the -COOH group is removed.

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“…Solutions of desired pH for photolysis were irradiated in a multilamp photoreactor with UVC light (λ = 254 nm) at different intensities. The description of the photoreactor is given in our earlier publication . Air was purged through the solution during the addition of the reagents and irradiation process using an air pump (make: Taiyo, India; model: TI‐5000; air flow rate: 2.5 Lmin −1 ).…”

Section: Methodsmentioning

confidence: 99%

UVC based advanced oxidation for decolourization and mineralization of calconcarboxylic acid in aqueous solution: Eco‐toxicological effect of post treated solutions and its remedy

2014

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The present study reports two important aspects of wastewater treatment by UVC light (λ = 254 nm) in the presence of hydrogen peroxide (HP) and ammonium persulphate (APS) taking Calconcarboxylic acid (CCA) as a model pollutant. The first part deals with the effect of various operational parameters on the decolourization and mineralization of CCA. Most importantly, the eco‐toxicological effect of the treated solutions was examined on the basis of E. coli growth inhibition bioassay and the remedy for the same has been suggested in the second part. Although both oxidants show higher mineralization at pH 1, APS is preferred over HP for having higher mineralization, biodetoxification, and electrical energy efficiency. The presence of –COOH group in CCA has detrimental effect on its mineralization and biodetoxification, as well as on the electrical energy efficiency. Although a rise in mineralization at all pH is observed by the removal of the –COOH group, it is significant in alkaline media. Since treatment at pH 1 is not ideal for real scale applications, it is advisable to remove the –COOH group before treatment, so as to make treatment possible in alkaline media. Removal of –COOH group also leads to higher biodetoxification in a shorter treatment period.

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Degradation and mineralization of Calcon using UV365/H2O2 technique: Influence of pH

Cited by 26 publications

References 47 publications

Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

Metal ion-catalyzed mineralization and biodetoxification studies of Calconcarboxylic acid in aqueous solution: effect of –COOH group

UVC based advanced oxidation for decolourization and mineralization of calconcarboxylic acid in aqueous solution: Eco‐toxicological effect of post treated solutions and its remedy

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