UVC induced TOC removal studies of Ponceau S in the presence of oxidants: Evaluation of electrical energy efficiency and assessment of biotoxicity of the treated solutions by Escherichia coli colony forming unit assay

Sahoo, M.K.; Marbaniang, M.; Sinha, B.; Naik, D.B.; Sharan, R.N.

doi:10.1016/j.cej.2012.10.002

Cited by 16 publications

(9 citation statements)

References 32 publications

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“…Samples at regular time intervals were withdrawn and degradation studies were carried out by measuring the absorbance at λmax = 258 that corresponds to C=C bands in pyridinium ring with the help of a UV-Vis spectrophotometer (Fig. 5) (Sahoo, 2012). Also, mineralization study was carried out by measuring the TOC of the samples (supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

Investigating the synergistic effect of UV/PS/TiO2 and UV/PI/TiO2 processes on paraquat herbicide degradation in media aqueous: statistical optimization, kinetic study, and estimation of electrical energy consumption

Ghavi

Bagherian

Rezaei-Vahidian³

2021

Preprint

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In this paper, the performance of UV/PS/TiO2 and UV/PI/TiO2 as hybrid AOPs for degradation of paraquat (PQ) herbicide in aqueous solution has been studied. The effect of several factors such as UV irradiation, initial oxidant concentration, nano-TiO2 (TiO2NPs) dosage, and pH on the degradation efficiency was investigated. Process optimization was performed by Central Composite Design (CCD) and response surface methodology (RSM) for 30 mgL− 1 of herbicide at 25 ˚C and 40 min. Based on the results, for UV/PS/TiO2 process a degradation efficiency of 83% was obtained in the optimum condition of initial PS concentration of 400 mgL− 1, initial TiO2NPs concentration of 150 mgL− 1, and pH = 6.3. Also for UV/PI/TiO2 process, 87% degradation efficiency was achieved in the optimum condition of initial PI concentration of 88 mgL− 1, initial TiO2NPs dosage of 125.5 mgL− 1, and pH of 7.5. Mineralization efficiency of the PQ solution by using PS and PI were about 47.5% and 57%, respectively after 80 min. Kinetic studies showed that both process follow pseudo-first-order kinetic model and their kinetic constants were 0.0299 min− 1 for PS process and 0.0604 min− 1 for PI process. Electrical energy consumption was estimated about 481.60 kWh/m3 for PS process and 238.41 kWh/m3 for PI process.

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Section: Methodsmentioning

confidence: 99%

Investigating the synergistic effect of UV/PS/TiO2 and UV/PI/TiO2 processes on paraquat herbicide degradation in media aqueous: statistical optimization, kinetic study, and estimation of electrical energy consumption

Ghavi

Bagherian

Rezaei-Vahidian³

2021

Preprint

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“…As colony-forming unit (CFU) assay in a particular test solution is a measure of the reproductive ability of E. coli, its metabolic inhibition or growth inhibition bioassay can be measured by counting the CFU. CFUbased assessment has proved to be a reliable measure of biotoxicity [10] and has been applied in our earlier studies [5,[11][12][13]. It is worth mentioning here that some authors have reported the disinfection of drinking water by AOPs including Fenton and Fenton-like processes by killing the micro-organisms [14,15].…”

Section: Introductionmentioning

confidence: 94%

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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“…UV/inorganic oxidants extensively used as an alternative method for removal of various organic pollutants from aqueous solutions. Recently, some reports are available about the photooxidation process in the presence of UV light/inorganic oxidants such as decomposition of 2-Chlorobiphenyl by IO À 4 and S 2 O 2À 8 [7], mineralization of Calcon by S 2 O 2À 8 [8], degradation of Acid Orange 7 by HSO À 5 and S 2 O 2À 8 [9], mineralization of Ponceau S by IO À 3 , BrO À 3 , and S 2 O 2À 8 [10], degradation of 4-fluorophenol by BrO À 3 , ClO À 3 , IO À 4 , and S 2 O 2À 8 [11], degradation of 4-chloro-2-methylphenol by BrO À 3 , ClO À 3 , and IO À 4 [12], photodefluoridation of pentafluorobenzoic acid by BrO À 3 , ClO À 3 , IO À 4 , and S 2 O 2À 8 [13], decolorization of C.I. Reactive Black 5 by IO À 3 , BrO À 3 , and S 2 O 2À 8 [14], removal of endosulfan by S 2 O 2À 8 and HSO À 5 [15] and degradation of antipyrine by S 2 O 2À 8 [16].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…Bromate is an inorganic disinfection in the mineralization process with an oxidation potential of 1.4 V in acidic medium [10]. Bromate under photolysis in aqueous solution decompose to generate a number of various radical species, BrO 3 • , • OH, O •− , O À 2 , etc.…”

Section: Influence Of Bro à 3 Concentrationmentioning

confidence: 99%

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Optimization of UV/inorganic oxidants system efficiency for photooxidative removal of an azo textile dye

Eskandarloo

Badiei

Behnajady

2015

Desalination and Water Treatment

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In this paper, photooxidative removal of C.I. Basic Red 46 (BR46) as a model organic pollutant was investigated in the presence of UV/inorganic oxidants system. The aim of this study was to evaluate the efficiency of hybrid oxidant system including inorganic oxidant species such as persulfate (S 2 O 2À 8 ), peroxymonosulfate (HSO À 5 ), periodate (IO À 4 ), bromate (BrO À 3 ), and chlorate (ClO À 3 ) under UV-C light irradiation. The effect of various inorganic oxidants concentration in different reaction times was predicted and optimized in the photooxidation process using response surface methodology. It was found that the concentration of inorganic oxidants significantly affected the removal rate of BR46. Modeling results showed that the predicted values of removal efficiency were found to be in good agreement with the experimental results with a correlation coefficient (R 2 ) of 0.9462. Optimization results showed that maximum removal efficiency (95.51%) was achieved at the optimum oxidants concentration: BrO À 3 of 118 mg L −1 , ClO À 3 of 24 mg L −1 , S 2 O 2À 8 of 1035 mg L −1 , HSO À 5 of 232 mg L −1 and IO À 4 of 267 mg L −1 in reaction time of 23 min. Effect of oxidants concentration on the photooxidative removal of BR46 was estimated by the response surface and contour plots. Furthermore, the photooxidative removal efficiency of hybrid oxidant system mode was compared with individual processes. The obtained results clearly demonstrated that experimental design approach was one of the useful and cost-effective methods for modeling and optimizing the efficiency of UV/inorganic oxidants system. Mineralization study showed 84.4% reduction in total organic carbon value after 90 min of process.

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UVC induced TOC removal studies of Ponceau S in the presence of oxidants: Evaluation of electrical energy efficiency and assessment of biotoxicity of the treated solutions by Escherichia coli colony forming unit assay

Cited by 16 publications

References 32 publications

Investigating the synergistic effect of UV/PS/TiO2 and UV/PI/TiO2 processes on paraquat herbicide degradation in media aqueous: statistical optimization, kinetic study, and estimation of electrical energy consumption

Investigating the synergistic effect of UV/PS/TiO2 and UV/PI/TiO2 processes on paraquat herbicide degradation in media aqueous: statistical optimization, kinetic study, and estimation of electrical energy consumption

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

Optimization of UV/inorganic oxidants system efficiency for photooxidative removal of an azo textile dye

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