Papers by Dr. Mihir Kumar Sahoo
The efficiency of Fenton, Fenton/MW and UV/oxidant processes in the treatment of a mixture of higher concentrations of azo dyes
Chemical Engineering Journal Advances
Acta chimica Slovenica, 2021
The removal of mixture of two azo dyes, Acid blue 29 and Ponceau xylidine, was studied by heterog... more The removal of mixture of two azo dyes, Acid blue 29 and Ponceau xylidine, was studied by heterogeneous Fenton and Fenton-type processes using hydrogen peroxide and sodium persulphate as oxidants in the presence of and nano and micro- particles as catalysts. The synthesised nano- particles were characterised using analytical techniques viz. FT-IR, TEM, EDX, powder XRD and VSM. We have examined the effects of particle size on the COD removal efficiency and the reusability of the catalyst after optimising pH, and concentrations of catalyst and oxidant. Combination of nano- and hydrogen peroxide possessed higher COD removal efficiency, which was accelerated in acidic pH and inhibited at pH > 6. Total consumption of hydrogen peroxide confirmed the efficiency of the optimised parameters. The mechanism of the formation of intermediate ions and products are proposed. COD removal and consumption of hydrogen peroxide follow pseudo-first-order kinetics. The toxicity of the solutions was a...
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Water science and technology : a journal of the International Association on Water Pollution Research, 2018
The present study reports a process for simultaneous mineralization and detoxification of Mordant... more The present study reports a process for simultaneous mineralization and detoxification of Mordant Black 17 with high electrical energy efficiency. Hydrogen peroxide and ammonium persulphate (APS) were used for the generation of hydroxyl and sulphate radicals using UV light (λ = 254 nm) and Fe and Ag ions as catalysts. The detoxification and energy efficiency of various processes were measured by monitoring growth inhibition of Escherichia coli and Electrical Energy per Order (EE/O) applicable for low concentration contaminants respectively. Systems catalyzed by Fe are more energy efficient and possess higher mineralization and detoxification efficiency than that of Ag. The concentration of the catalysts and oxidants were found to strongly influence the EE/O of the systems. The most cost efficient processes for simultaneous mineralization and detoxification are Fe/APS/UV at pH 3.00 and Fe/HO/UV at pH 3.00 and 5.78. The upper limit concentration of Fe is fixed at 0.01 mM for complete ...
The Canadian Journal of Chemical Engineering, 2014
Decolourisation, mineralisation and detoxification of mixture of azo dyes using Fenton and Fenton-type advanced oxidation processes
Chemical Papers
UV light-assisted mineralisation and biodetoxification of Ponceau S with hydroxyl and sulfate radicals
Chemical Papers, 2016
The present study reports simultaneous mineralisation and biodetoxification of Ponceau S (3-hydro... more The present study reports simultaneous mineralisation and biodetoxification of Ponceau S (3-hydroxy-4-(2-sulfo-4-[4-sulfophenylazo]phenylazo)-2,7-naphthalenedisulfonic acid sodium salt), an azo dye, by UV light assisted oxidation with hydroxyl and sulfate radicals. Metal ion catalysts used in the work were: Fe
Metal ion-catalyzed mineralization and biodetoxification studies of Calconcarboxylic acid in aqueous solution: effect of –COOH group
Desalination and Water Treatment, 2014
Effect of gamma-irradiation on the thermal decomposition of pure and doped (Ba2+ caesium bromate
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry, 1992
Influence of additives on the solid phase thermal decomposition of barium bromate
Thermochimica Acta, 1988
... in The Netherlands INFLUENCE OF ADDITIVES ON THE SOLID PHASE THERMAL DECOMPOSITION OF BARIUM ... more ... in The Netherlands INFLUENCE OF ADDITIVES ON THE SOLID PHASE THERMAL DECOMPOSITION OF BARIUM BROMATE D. BHATTA *, MK SAHOO and ... at 563 K Substance Initial gas Induction Linear rate evolution period constant k^ (mm) (XlO2 min~') (XlO2 Acceleratory ...
Effect of Ba2+ doping on the thermal decomposition of caesium bromate
Thermochimica Acta, 1992
Removal of Acid Blue 29 in aqueous solution by Fenton and Fenton-like processes
Desalination and Water Treatment, 2014
TiO2photocatalysis: progress from fundamentals to modification technology
Desalination and Water Treatment, 2013
Influence of additives on the solid phase thermal decomposition of barium bromate
Thermochimica acta, 1988
... in The Netherlands INFLUENCE OF ADDITIVES ON THE SOLID PHASE THERMAL DECOMPOSITION OF BARIUM ... more ... in The Netherlands INFLUENCE OF ADDITIVES ON THE SOLID PHASE THERMAL DECOMPOSITION OF BARIUM BROMATE D. BHATTA *, MK SAHOO and ... at 563 K Substance Initial gas Induction Linear rate evolution period constant k^ (mm) (XlO2 min~') (XlO2 Acceleratory ...
Chromatographia, 1993
Various volatile radiolytic products formed in the gamma-radiolysis of ortho-, metaand paradinitr... more Various volatile radiolytic products formed in the gamma-radiolysis of ortho-, metaand paradinitrobenzene solutions in carbon tetrachloride are identified using a combined system of gas chromatography-Fourier transform infrared spectrometry-mass Spectrometry. Tetrachloroethylene; hexachloro-ethane; isomeric chloronitrobenzenes; di-, tri-, tetra-and Pentachlorobenzenes; chloro-and dichioroisocyanatobenzene; and 1-chloro-2-(trichioromethyl)benzene are among the most important products formed in the radiolysis, lpso-substitution of one and both the nitro groups, as well as hydrogen atom by chlorine atom and trichloromethyl free radical is observed. It is postulated that isomeric chloroisocyanatobenzenes are formed by the interaction of dichlorocarbene and isomeric dinitrobenzenes.
Chemical Engineering Journal, 2012
Mineralization of Calcon, an azo dye, was carried out using UV 254 in the presence of H 2 O 2 (HP... more Mineralization of Calcon, an azo dye, was carried out using UV 254 in the presence of H 2 O 2 (HP) and (NH 4) 2 S 2 O 8 (APS) as oxidants. Degradation is found to be pH dependent and with UV/HP system, it proceeds efficiently at pH 1 and 12.6 even though mineralization is efficient at pH 1. The mineralization efficiency is in the order: UV/APS > UV/HP in acidic to neutral medium and UV/HP > UV/APS in basic medium. Nevertheless, lowest mineralization is recorded at pH 7 and 9 for UV/HP and UV/APS systems respectively. Most importantly decay in degradation was not observed at higher concentrations of oxidants. Presence of anions exerts inhibition effect on the degradation process, which is in the order: Cl − > SO 4 2− > NO 3 − and SO 4 2− > Cl − > NO 3 − for HP and APS as oxidants respectively. Toxicity of the treated solutions was determined on the basis of E. coli growth and the detoxification efficiency of the systems was found to be in the order UV/APS > UV/HP. The solution after mineralization was completely detoxified by adjusting its pH to 7. Based on the results, it is recommended that APS is the most suitable oxidant for both mineralization and detoxification processes of Calcon.
Chemical Engineering Journal, 2012
h i g h l i g h t s " More than 50% mineralization of Ponceau S is equally by UV/H 2 O 2 and UV/(... more h i g h l i g h t s " More than 50% mineralization of Ponceau S is equally by UV/H 2 O 2 and UV/(NH 4) 2 S 2 O 8 in acidic to basic media. " Efficiency for both systems follows the order: pH 1 > pH 3 > pH 5 % pH 6.62 % pH 9 > pH 13. " Treatment at pH 1 is 4.2 times more economical than at pH 6.62 in terms of electrical energy consumption. " Recommended parameters for treatment are: pH 6.62, UV intensity-1417 lW cm À2 , oxidant-H 2 O 2. " Complete detoxification after mineralization is achieved when the pH is adjusted to 7. g r a p h i c a l a b s t r a c t Effect of (NH 4) 2 S 2 O 8 , H 2 O 2 , KIO 3 and KBrO 3 as oxidants on mineralization of Ponceau S: [Ponceau S] = 0.05 mM; [oxidant] = 0.95 mM; exposure time = 90 min; UV intensity = 213 lW cm À2. Inset: Effect of UV intensity and exposure time on initial solution pH: [PS] = 0.05 mM; [HP] = 0.95 mM; initial pH 6.62.
Transition metal catalyzed mineralization of Calcon and bioassay of the mineralized solutions by Escherichia coli colony forming unit assay
Chemical Engineering Journal, 2012
ABSTRACT Mineralization of Calcon was studied by Fenton and Fenton like processes in a wide range... more ABSTRACT Mineralization of Calcon was studied by Fenton and Fenton like processes in a wide range of pH with hydrogen peroxide (HP) and ammonium persulphate (APS) as oxidants and catalyzed by transition metal catalysts such as Fe2+, Ag+ and Co2+. Maximum mineralization for Fenton and other processes was achieved at pH 3 and 1, respectively. Although mineralization was negligible in alkaline media, the catalytic activity of metal ions on HP is found to be similar, while that on APS was in the order: Fe2+ > Co2+ > Ag+. The study reveals that Calcon resisted mineralization by Fenton process (35.6% in 120 min) and the efficiency of other systems followed the order: Fe2+/APS > Ag+/APS ≈ Ag+/HP > Co2+/HP > Co2+/APS and a maximum of 91.1% and 73.7% mineralization were achieved with Fe2+/APS and Ag+/APS systems, respectively, at pH 1. To understand the impact of these processes operating at low pH, biotoxicity of the treated solutions was evaluated on the basis of Escherichia coli (E. coli) growth inhibition bioassay. It was observed that the treated solutions were still more toxic to E. coli than the original dye solution. Thus, metal catalyzed Fenton and Fenton like processes are not environmentally benign under the specified conditions of our study.
Chromatographia, 1993
A number of volatile products formed in the gamma-radiolysis of nitrobenzene-carbon tetrachloride... more A number of volatile products formed in the gamma-radiolysis of nitrobenzene-carbon tetrachloride solution have been identified using a GC-FTIR-MS technique. The conditions for separation of the products have been described. HCl, COCl2, chlorobenzene, chloro- and dichloronitrobenzene, isomeric di-, tri- and tetrachlorobenzene, hexachloroethane, tetrachloroethylene, α,α,α-trichloromethylbenzene, chloro- and dichloroisocyanatobenzene, and other chloroderivatives are among the important products formed.Ipso-substitution of the nitro group
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Papers by Dr. Mihir Kumar Sahoo