Enhanced coagulation-photocatalytic treatment of Acid red 73 dye and real textile wastewater using UVA/synthesized MgO nanoparticles

Jorfi, Sahand; Barzegar, Gelavizh; Ahmadi, Mehdi; Soltani, Reza Darvishi Cheshmeh; Haghighifard, N A Jafarzadeh; Takdastan, Afshin; Saeedi, Reza; Abtahi, Mehrnoosh

doi:10.1016/j.jenvman.2016.04.005

Cited by 153 publications

(56 citation statements)

References 42 publications

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“…However, when H 2 O 2 dosage was greater than 400 mg/L, COD removal rate decreased slightly. The decrease of COD removal rate was attributed to the competitive reaction between hydroxyl radicals and H 2 O 2 to generate hydroperoxyl radicals with excess dosage of H 2 O 2 . The hydroperoxyl radical was also an effective oxidant itself, but the hydroperoxyl radicals were much less reactive and did not contribute to the oxidative degradation of organic substrates, which occurred only by reaction with hydroxyl radical …”

Section: Resultsmentioning

confidence: 99%

Advanced treatment of actual textile dye wastewater by Fenton‐flocculation process

Xiao

Sun

et al. 2016

Can J Chem Eng

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To improve the performance of actual textile dye wastewater treatment, an advanced treatment combining the Fenton and flocculation processes was developed. The parameters affecting decolorization in the Fenton-flocculation process, including initial pH, H 2 O 2 dosage, Fe 2þ dosage, reaction temperature, reaction time, and flocculant dosage, were examined. With the optimal Fenton-flocculation condition parameters, more than 95 % COD removal, 99 % colour removal, and 99 % turbidity removal were obtained. UV-visible spectra of raw water and supernatant were further obtained after the Fenton-flocculation process, and results demonstrated that the chromophoric groups and the conjugated system in the dye molecular structure were destroyed. All these results confirmed that the Fenton-flocculation process was a favourable and effective post-treatment method for actual textile dye wastewater.

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Section: Resultsmentioning

confidence: 99%

Advanced treatment of actual textile dye wastewater by Fenton‐flocculation process

Xiao

Sun

et al. 2016

Can J Chem Eng

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“…Los tratamientos de aguas residuales textiles convencionales involucran la coagulación química con sales de hierro o aluminio combinada con procesos biológicos o adsorción (Verma et al 2012, Vedrenne et al 2012). El proceso de coagulación es eficiente para la remoción de coloides y sólidos suspendidos; diferentes estudios reportan que este tipo de contaminantes representan alrededor de 50 % de la DQO total de un efluente textil (Jorfi et al 2016, GilPavas et al 2017. Por consiguiente, se emplea generalmente como etapa de pretratamiento, de ahí que sea necesario efectuar un tratamiento posterior con el objeto de eliminar los contaminantes remanentes y satisfacer la legislación ambiental.…”

Section: Introductionunclassified

Tratamiento De Aguas Residuales De La Industria Textil Mediante Coagulación Química Acoplada a Procesos Fenton Intensificados Con Ultrasonido De Baja Frecuencia

GilPavas¹,

Arbeláez-Castaño²,

Medina-Arroyave³

et al. 2018

Rev. Int. Contam. Ambie.

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Palabras clave: procesos avanzados de oxidación, sonoquímica, ultrasonido, Box-Behnken, optimización RESUMENEn la presente investigación se evaluó el tratamiento secuencial de coagulación quími-ca (CQ) seguida de los procesos avanzados de oxidación (PAO) Fenton (H2O2/Fe 2+ ) o foto-Fenton (UV/H2O2/Fe 2+ ) intensificados con radiación de ondas de ultrasonido (US) de baja frecuencia. La optimización del proceso de pretratamiento con CQ, mediante la prueba de jarras, mostró que una dosis óptima de coagulante (Al2[SO4]3) de 800 mg/L, remueve 99 % de la turbidez y 53 % de la demanda química de oxígeno (DQO). El clarificado resultante se empleó para la evaluación de los PAO. Mediante el análisis estadístico del diseño de experimentos de superficie de respuesta Box-Behnken se estableció que las condiciones óptimas de operación para el proceso US/H2O2/Fe 2+ fueron: 1 mM de Fe 2+ , 14 mM de H2O2 y pH 3. En estas condiciones de operación el proceso de CQ acoplado con el proceso US/H2O2/Fe 2+ removió alrededor de 82 % de la DQO en tanto que al acoplarlo con el proceso US/UV/H2O2/Fe 2+ alcanzó 95 % de eliminación en 90 min de reacción. El uso de ondas de ultrasonido incrementa la eficiencia del proceso alrededor de 10 %. Durante el proceso también se monitorearon la mineralización de los contaminantes y el consumo de H2O2.Key words: avanced oxidation process, sonochemistry, ultrasound, Box-Behnken, optimization

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“…These compounds are often toxic, carcinogenic, and mutagenic to living organisms, chemically and photo-chemically stable, and non-biodegradable 1,2 . Based on the literature, a large number of dye molecules has been categorized as carcinogenic substances.…”

Section: Introductionmentioning

confidence: 99%

Visible Light Photocatalytic Degradation of Azo Dye and a Real Textile Wastewater Using Mn, Mo, La/TiO2 /AC Nanocomposite

Jorfi¹

2018

Chem.Biochem.Eng.Q.

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Mn, Mo, La/TiO 2 /activated carbon (AC) photocatalysts were synthesized by sol-gel method. The prepared samples were characterized by XRD, FT-IR, BET, DRS, and FE-SEM techniques. The findings revealed that the synthesized catalysts were anatase type and nano-sized particles. The catalysts exhibited high adsorption ability in the visible light region with a red shift in the adsorption edge. The formation of Mn, Mo, La/TiO 2 / AC crystallites in the activated carbon was confirmed by FE-SEM. The effects of initial dye concentration, catalyst dosage, reaction time, and solution pH were investigated for removal of Reactive Red 198. According to the obtained results, the maximum removal efficiency of 91 % was obtained at initial dye concentration of 20 mg L -1 , pH of 3, and catalyst concentration of 2 g L -1 . Synthesized nano-photocatalyst showed reasonable photo degradation efficiency of 84 % for initial COD concentration of 4700 mg L -1 in treatment of a real textile wastewater sample. GC/MS analysis of raw and treated wastewater confirmed degradation and producing of simple intermediates during the photocatalytic process.

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Enhanced coagulation-photocatalytic treatment of Acid red 73 dye and real textile wastewater using UVA/synthesized MgO nanoparticles

Cited by 153 publications

References 42 publications

Advanced treatment of actual textile dye wastewater by Fenton‐flocculation process

Advanced treatment of actual textile dye wastewater by Fenton‐flocculation process

Tratamiento De Aguas Residuales De La Industria Textil Mediante Coagulación Química Acoplada a Procesos Fenton Intensificados Con Ultrasonido De Baja Frecuencia

Visible Light Photocatalytic Degradation of Azo Dye and a Real Textile Wastewater Using Mn, Mo, La/TiO2 /AC Nanocomposite

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