Treatability of textile dye-bath effluents by advanced oxidation: preparation for reuse

Ince, Nilsun H.; Tezcanli, G.

doi:10.1016/s0273-1223(99)00379-0

Cited by 58 publications

(3 citation statements)

References 11 publications

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“…Effect of the Solution pH. Many studies have revealed that the solution pH can dramatically influence the photoassisted Fenton degradation of organic compounds and the optimal solution pH is determined to be about 3.0. − ,, At a pH below 3, the scavenging effect of the • OH radical by H + is severe, while at a pH higher than 3, the formation of • OH radicals becomes slow because of hydrolysis of Fe 2+ and the precipitation of FeOOH from the solution.…”

Section: Resultsmentioning

confidence: 99%

“…Since the 1990s, Fenton and photoassisted Fenton reactions have been widely utilized in the degradation of aromatic organic compounds in industrial wastewater. Their effectiveness results from the fact that the generated hydroxyl radicals ( • OH) are highly reactive and nonselective such that they are able to decompose many organic compounds. − However, it should be noted that the Fe ion sludge with a large volume after Fenton and photoassisted Fenton reactions is a big drawback because the removal of the Fe ions at the end of treatment by precipitation and redissolution is a rather costly process.…”

Section: Introductionmentioning

confidence: 99%

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Degradation of Azo-dye Orange II by a Photoassisted Fenton Reaction Using a Novel Composite of Iron Oxide and Silicate Nanoparticles as a Catalyst

Feng¹,

Hu²,

Yue³

et al. 2003

Ind. Eng. Chem. Res.

247

120

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A novel nanocomposite of iron oxide and silicate, prepared through a reaction between a solution of iron salt and a dispersion of Laponite clay, was used as a catalyst for the photoassisted Fenton degradation of azo-dye Orange II. This catalyst is much cheaper than the Nafion-based catalysts, and our results illustrate that it can significantly accelerate the degradation of Orange II under the irradiation of UV light (λ = 254 nm). An advantage of the catalyst is its long-term stability that was confirmed through using the catalyst for multiple runs in the degradation of Orange II. The effects of the H2O2 molar concentration, solution pH, wavelength and power of the UV light, catalyst loading, and initial Orange II concentration on the degradation of Orange II were studied in detail. In addition, it was also found that discoloration of Orange II undergoes a faster kinetics than mineralization of Orange II and 75% total organic carbons of 0.1 mM Orange II can be eliminated after 90 min in the presence of 1.0 g of Fe-nanocomposite/L, 4.8 mM H2O2, and 1 × 8W UVC.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradation of Azo-dye Orange II by a Photoassisted Fenton Reaction Using a Novel Composite of Iron Oxide and Silicate Nanoparticles as a Catalyst

Feng¹,

Hu²,

Yue³

et al. 2003

Ind. Eng. Chem. Res.

247

120

View full text Add to dashboard Cite

show abstract

“…During a chemical or biological reaction pathway, these dye compounds not only deplete the dissolved oxygen in water bodies but also release some toxic compounds to endanger aquatic life. To protect the aquatic environment, many methods such as adsorption, electrocoagulation, ultrasonic decomposition, advanced chemical oxidation, nanofiltration, and chemical coagulation followed by sedimentation were used to remove dyes from wastewater. − Specifically, advanced oxidation processes (AOPs) involving hydroxyl radical, a very powerful chemical oxidant that can destroy a wide range of tough organic contaminants, are introduced to treat textile dyes effluents. − Because of the advantages of photocatalytic decomposition of dye wastewaters using TiO 2 particles or films, advanced oxidation by TiO 2 /UV has been gaining industrial and academic attention. − …”

Section: Introductionmentioning

confidence: 99%

Kinetics of Photocatalytic Decomposition of Methylene Blue

Chern

2006

Ind. Eng. Chem. Res.

217

122

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To treat dyeing and finishing industrial wastewater effluents by an advanced oxidation process, the decomposition kinetics of methylene blue by nanofine sol TiO 2 /UV was systematically studied in two batch slurry reactors. The factors of study include agitation speed, recirculation flow rate, initial dissolved oxygen concentration, initial methylene blue concentration, reaction temperature, TiO 2 dosage, and UV light intensity. By using the network reduction technique, the general rate equation has been developed from considering the reaction mechanism. The rate equation uses a systematic reaction network reduction technique to avoid the need of more restrictive assumptions commonly used, such as a rate-determining step or equilibrium steps. The resulting rate equation is applicable to a wider range of reaction conditions. After applying the resulting rate equation to predict the transient concentrations of other dye compounds, we expect it can be applied for the kinetics of photodecomposition of other organic compounds.

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Experimental Design of Fenton Process for the Oxidation and Mineralization of Monocrotophos

Üstün

Solmaz

Azak

2015

CLEAN Soil Air Water

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In this study, the Fenton treatment of Monocrotophos (MCP) was evaluated in terms of oxidation and mineralization efficiency using response surface methodology (RSM). The effects of MCP, Fe2+, H2O2 concentrations and reaction time, and the interactions between these factors on (i) the oxidation efficiency of MCP and (ii) the mineralization of MCP were studied. Hence, the objective of this study was to optimize MCP oxidation and mineralization by the Fenton process (FP) using RSM. The obtained optimum conditions for MCP oxidation and mineralization using FP were 0.022:0.03:0.15 MCP/Fe2+/H2O2 and a reaction time of 65 min. MCP was mineralized easily through the Fenton reaction. The MCP oxidation efficiency was 90% and the mineralization efficiency was 66%. The initial MCP concentration was the most significant variable affecting both the oxidation and mineralization efficiency of MCP. Addition of Fe2+ had a more significant effect on the MCP oxidation compared to the MCP mineralization.

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Treatability of textile dye-bath effluents by advanced oxidation: preparation for reuse

Cited by 58 publications

References 11 publications

Degradation of Azo-dye Orange II by a Photoassisted Fenton Reaction Using a Novel Composite of Iron Oxide and Silicate Nanoparticles as a Catalyst

Degradation of Azo-dye Orange II by a Photoassisted Fenton Reaction Using a Novel Composite of Iron Oxide and Silicate Nanoparticles as a Catalyst

Kinetics of Photocatalytic Decomposition of Methylene Blue

Experimental Design of Fenton Process for the Oxidation and Mineralization of Monocrotophos

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