Direct Blue 71 removal by electrocoagulation sludge recycling in photo-Fenton process: response surface modeling and optimization

Moradi, Mahsa; Eslami, Akbar; Ghanbari, Farshid

doi:10.1080/19443994.2014.995714

Cited by 10 publications

(2 citation statements)

References 31 publications

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“…Direct and reactive dye materials, in particular, are commonly produced in large amounts for textile industry printing and dyeing processes to bring color to cellulosic materials, due to their availability and range of colors [ 5 ]. Due to their toxicity, these dyes have both been extensively studied for their removal from wastewater by various techniques [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

López-Rodríguez

Micó-Vicent

Bonet-Aracil

et al. 2022

IJMS

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Concerns about the health of the planet have grown dramatically, and the dyeing sector of the textile industry is one of the most polluting of all industries. Nanoclays can clean dyeing wastewater using their adsorption capacities. In this study, as a new finding, it was possible to analyze and quantify the amount of metal ions substituted by anionic dyes when adsorbed, and to determine the optimal amount of nanoclay to be used to adsorb all the dye. The tests demonstrated the specific amount of nanoclay that must be used and how to optimize the subsequent processes of separation and processing of the nanoclay. Hydrotalcite was used as the adsorbent material. Direct dyes were used in this research. X-ray diffraction (XRD) patterns allowed the shape recovery of the hydrotalcite to be checked and confirmed the adsorption of the dyes. An FTIR analysis was used to check the presence of characteristic groups of the dyes in the resulting hybrids. The thermogravimetric (TGA) tests corroborated the dye adsorption and the thermal fastness improvement. Total solar reflectance (TSR) showed increased radiation protection for UV-VIS-NIR. Through the work carried out, it has been possible to establish the maximum adsorption point of hydrotalcite.

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Section: Introductionmentioning

confidence: 99%

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

López-Rodríguez

Micó-Vicent

Bonet-Aracil

et al. 2022

IJMS

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“…Isa [36] used a 3-level factorial design to study the electrochemical degradation of an azoic dye. Moradi et al [37] and Li et al [23] utilized a composite central design model for the bleaching of azoic dyes. Debnath et al [21] employed modified TiO 2 for the degradation of two colorants, establishing a factorial design.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Reactive Blue 19 dye removal using ozone and ozone/UV employing response surface methodology

2020

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This work reports the degradation of Reactive Blue 19 (RB19) dye using ozone and ozone/UV. The effects of operational parameters such as pH, ozone concentration and UV radiation were examined. A two factor with three levels factorial design was carried out and the interaction between variables was studied. Response surface methodology was applied in order to optimize ozone concentration, pH and UV radiation in terms of the half life time required for discoloration and/or mineralization of the solution. Equations of color and TOC half-life time with respect to operational conditions were determined. Contour plots and a desirability function were used to find the local points of optimization. Optimized reaction conditions were established as pH 8.26, UV radiation of 40 W and ozone concentration of 50 g Nm −3 . A specific experiment was carried out under the optimal conditions where RB19 half life time was 1.59 min and TOC half life time was 30.98 min, confirming the agreement between model and experimental results. The obtained results confirm ozonation as a promising alternative for treatment of wastewater with a high content of recalcitrant reactive dyes.

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Optimizing COD removal from greywater by photoelectro-persulfate process using Box-Behnken design: assessment of effluent quality and electrical energy consumption

Ahmadi

Ghanbari

2016

Environ Sci Pollut Res

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Greywater (GW) is a potential source for water reuse in various applications. However, GW treatment is still a vital issue in water reuse in cases of environmental standards and risk to public health. This study investigates optimization and modeling of a hybrid process for COD removal from GW. Persulfate (PS) was simultaneously activated by electrogenerated ferrous ion (EC) and UV to generate sulfate radical. Photoelectro-persulfate (PEPS) was optimized by Box-Behnken design and the effects of four variables (pH, PS dosage, current density, and electrolysis time) were evaluated on COD removal. The results and several coefficients showed that the obtained model was acceptable for predicting the COD removal. Moreover, under optimum conditions (pH = 6.9, PS = 8.8 mM, current density = 2.0 mA/cm(2), and 49.3 min electrolysis time), BOD5, turbidity, TSS, phosphate, and UV254 were effectively removed and COD and BOD5 values reached to discharge standards. Different configurations of the processes were assessed for COD removal. The order of COD removal efficiency followed: PS < Fe(II) < UV/PS ≤ Fe(II)/PS < Fe(II)/PS/UV < electrocoagulation ≤ electrocoagulation/UV < electro-PS < PEPS. The monitoring PS concentration during 60 min reaction time in the aforesaid processes indicated that PEPS could remarkably activate PS. The solution pH was also monitored and related results revealed that the presence of PS during the 10 min first time decreased pH value while production of hydroxide ion at cathode increased pH significantly. Finally, the contribution of electrochemical process in the electrical energy consumption was far less than that of photolysis process in hybrid PEPS process.

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Direct Blue 71 removal by electrocoagulation sludge recycling in photo-Fenton process: response surface modeling and optimization

Cited by 10 publications

References 31 publications

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

Optimization of Reactive Blue 19 dye removal using ozone and ozone/UV employing response surface methodology

Optimizing COD removal from greywater by photoelectro-persulfate process using Box-Behnken design: assessment of effluent quality and electrical energy consumption

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