Decolourization of azo dyes using magnesium–palladium system

Patel, Rachna; Suresh, S.

doi:10.1016/j.jhazmat.2006.05.019

Cited by 117 publications

(50 citation statements)

References 36 publications

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“…It has been reported that the main advantage of systems that use Mg 0 and Mg/Cu particles is the ability to conduct reactions under atmospheric oxygen conditions [1,19,20,28]. To confirm this concept, the reaction was conducted under aerobic conditions without any control of DO using varying doses of 1% Mg/Cu particles and 100 mg/L NO 3 - (Fig.…”

Section: Effect Of Mg/cu Dosage On Nitrate Reductionmentioning

confidence: 99%

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Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Ramavandi

Mortazavi

Moussavi

et al. 2011

Reac Kinet Mech Cat

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Bimetallic particles have recently been used as a new means of contaminant reduction from water. Comparing with Fe 0 and Mg 0 alone, synthesized magnesium/copper (Mg/Cu) bimetallic particles have been determined to be potential and efficient agents for nitrate reduction from aqueous solutions. This study suggests that the reductive denitrification of nitrate by Mg/Cu bimetallic particles was dependent on a number of parameters including reductant dose, solution temperature, initial nitrate concentration and contact time. The 1% Mg/Cu (Cu loading of 1 wt.%) bimetallic particles removed the majority of the various nitrate concentrations tested (50, 100, 150, 200 and 300 mg/L) within a short period. The time required for the removal of 90.6% of the NO 3 -from a 100-mg/L solution was about 20 min using 2 g/L bimetallic Mg/Cu at an initial solution pH of 6. The activation energy (E a ) for the nitrate reduction by 1% Mg/Cu over the temperature range of 5-60°C was 12.77 kJ/mol. The experimental results of the kinetic analysis from batch studies indicated that a higher initial nitrate concentration yielded a greater reaction rate constant and the denitrification rate increased with increasing 1% Mg/Cu dosage. The effects of mixing rate on the denitrification rate suggested that the reaction rate increases linearly at mixing rate \100 rpm and remained almost constant at rates over that.

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Section: Effect Of Mg/cu Dosage On Nitrate Reductionmentioning

confidence: 99%

“…In several studies, magnesium in a bimetallic form has been used for the dechlorination of chlorinated hydrocarbons [19,20] and nitrate reduction [21]. These studies have revealed that magnesium in a bimetallic form has enhanced reactivity toward chlorinated organic compounds and nitrate when compared to zero-valent magnesium.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Ramavandi

Mortazavi

Moussavi

et al. 2011

Reac Kinet Mech Cat

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“…Dye decolorization was Scheme 1 Molecular structure of naphthol blue black measured spectrophotometrically with a UV-Vis. spectrophotometer (Model UV-1700 Pharmaspec Shimadzu) based on the maximum absorbance at 620 nm in the visible range, at different pHs (3,4,5,6,7,8) and temparatures (25,30,35,40,45, 50, 60, 70°C ) for 60 minutes. Experiments were performed in triplicate and results were given as the mean values.…”

Section: Azo Dye Decolorization By Horseradish Peroxidasementioning

confidence: 99%

“…Strong colour imparted by dyes to the receiving aquatic ecosystems poses aesthetic problems as well as serious ecological problems, such as carcinogenicity and inhibition of benthic photosynthesis. Therefore, a number of techniques aimed at preferential removal of dyes from wastewater have been developed [2][3][4][5]. Azo dyes have been widely used as colourants in a variety of products such as textiles, paper and leather.…”

Section: Introductionmentioning

confidence: 99%

Decolorization of Naphthol Blue Black using the Horseradish Peroxidase

Onder

Celebi

Altıkatoğlu

et al. 2010

Appl Biochem Biotechnol

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This study evaluates the potential of the enzyme horseradish peroxidase in the decolorization of one common industrial azo dye, naphthol blue black. Studies are carried out to understand the process parameters such as pH, temperature and reaction time. The enzymatic decolorization of the dye was examined by UV-Vis spectrophotometer and LC-MS measurements. Temperature and pH conditions were optimized for obtaining high azo-dye decolorization. Azo-dye removal at a pH range 4-6 was found to be the highest for all temperatures. After 5 minutes of treatment, the color removal of dye was ca. 80-90%. The LC-MS and spectrophotometric analyses indicated that the decolorization of the azo dye with enzyme was due to the reduction of the azo bonds. This study verifies the viability of the use of the horseradish peroxidase in the decolorization of naphthol blue black.

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“…Physical and chemical methods have been widely used for the decolorization of dyes liberated by textile industries, but these methods are not feasible techniques since they are very expensive and forming hazardous by-products or intensive energy requirement (Patel et al, 2006). Microbial decolorization methods are commonly applied to treat textile industry effluents because various microorganisms, such as bacteria, yeasts, algae and fungi, are able to remove different classes of dyes (Tan et al, 2013;Kelewou et al, 2014).…”

Section: Introductionmentioning

confidence: 99%