Optimization of UV/inorganic oxidants system efficiency for photooxidative removal of an azo textile dye

Eskandarloo, Hamed; Badiei, Alireza; Behnajady, Mohammad A.

doi:10.1080/19443994.2014.912965

Cited by 17 publications

(3 citation statements)

References 39 publications

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“…, and IO 4 − are used for the removal and mineralization of various organic pollutants from aqueous solutions due to the synergistic effect in different highly reactive radicals in the hybridizing photo-oxidation process of various inorganic oxidants, and are having better results in comparison to the individual processes [25][26][27][28][29]. They have enhanced the rate of UV-induced decomposition of organic pollutants in the presence of photo-catalysis.…”

Section: Inorganic Oxidants Such Asmentioning

confidence: 99%

Investigating the Performance of UV/PS/Tio2nps and UV/PI/Tio2nps Processes on Paraquat Herbicide Degradation in Aqueous Media: Statistical Optimization, Kinetic Study, and Estimation of Electrical Energy Consumption

Ghavi¹,

Bagherian²,

Rezaei-Vahidian³

2021

Preprint

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Background: In this work, the performance of UV/PS/TiO2NPs and UV/PI/TiO2NPs as hybrid advanced oxidation processes for degradation of the herbicide paraquat in aqueous solution is studied.Results: The effects of several factors such as the UV irradiation, initial oxidant concentration, TiO2 nanoparticles dosage, and pH on the degradation efficiency are investigated. The process optimization is performed by the central composite design and the response surface methodology for 30 mg L-1 of the herbicide at 25 ˚C and 40 min. Based on the results, a degradation efﬁciency of 77 % and 90 % have been obtained for the UV/PS/TiO2NPs and UV/PI/TiO2NPs processes respectively, in the optimum conditions. The mineralization efficiency of the paraquat solution using UV/PS/TiO2NPs and UV/PI/TiO2NPs processes are about 32 % and 55%, respectively, after 40 min. The kinetic studies show that both processes follow a pseudo-first-order kinetic model, and the kinetic constants are 0.0299 min-1 for the PS process and 0.0604 min-1 for the PI process. The electrical energy consumption has been estimated to be about 481.60 kWh/m3 for the PS process and 238.41 kWh/m3 for the PI process.Conclusions: The degradation and mineralization efficiency of the paraquat solution using UV/PI/TiO2NPs process are more than UV/PS/TiO2NPs process in the optimum conditions after 40 min.

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Section: Inorganic Oxidants Such Asmentioning

confidence: 99%

Investigating the Performance of UV/PS/Tio2nps and UV/PI/Tio2nps Processes on Paraquat Herbicide Degradation in Aqueous Media: Statistical Optimization, Kinetic Study, and Estimation of Electrical Energy Consumption

Ghavi¹,

Bagherian²,

Rezaei-Vahidian³

2021

Preprint

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“…Inorganic oxidants such as ClO 3 − , BrO 3 − , H 2 O 2 , S 2 O 8 2− ,and IO 4 − used for removal and mineralization of various organic pollutants from aqueous solutions due to the synergistic effect in generated different highly reactive radicals in Hybridizing photo-oxidation process of various inorganic oxidants and be having better results in comparison to the individual processes Eskandarloo et al, 2015;Wang and Hong, 1999;Elddine, 2015;Jafarinejad, 2017, Ali andHassan, 2008. They can activate by ultrasonic waves, heating, UV irradiation and also it can chemically activate using Fe 0 , Fe 2+ , Zn 2+ , etc Sharma et al, 2015;Sahoo, 2013. Undergoing photolysis or thermolysis in aqueous solution, S 2 O 8 2− decomposes to generate the reactive radicals (eq.…”

Section: Introductionmentioning

confidence: 99%

Investigating the synergistic effect of UV/PS/TiO2 and UV/PI/TiO2 processes on paraquat herbicide degradation in media aqueous: statistical optimization, kinetic study, and estimation of electrical energy consumption

Ghavi

Bagherian

Rezaei-Vahidian³

2021

Preprint

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In this paper, the performance of UV/PS/TiO2 and UV/PI/TiO2 as hybrid AOPs for degradation of paraquat (PQ) herbicide in aqueous solution has been studied. The effect of several factors such as UV irradiation, initial oxidant concentration, nano-TiO2 (TiO2NPs) dosage, and pH on the degradation efficiency was investigated. Process optimization was performed by Central Composite Design (CCD) and response surface methodology (RSM) for 30 mgL− 1 of herbicide at 25 ˚C and 40 min. Based on the results, for UV/PS/TiO2 process a degradation efficiency of 83% was obtained in the optimum condition of initial PS concentration of 400 mgL− 1, initial TiO2NPs concentration of 150 mgL− 1, and pH = 6.3. Also for UV/PI/TiO2 process, 87% degradation efficiency was achieved in the optimum condition of initial PI concentration of 88 mgL− 1, initial TiO2NPs dosage of 125.5 mgL− 1, and pH of 7.5. Mineralization efficiency of the PQ solution by using PS and PI were about 47.5% and 57%, respectively after 80 min. Kinetic studies showed that both process follow pseudo-first-order kinetic model and their kinetic constants were 0.0299 min− 1 for PS process and 0.0604 min− 1 for PI process. Electrical energy consumption was estimated about 481.60 kWh/m3 for PS process and 238.41 kWh/m3 for PI process.

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“…It includes several benefits such as being more economical, requiring fewer experimental runs, studying the interaction between parameters on response, predicting the response, checking the method adequacy, and requiring a shorter time [32]. RSM-based modeling studies have been commonly used in many treatment processes such as Fenton [37], photo-Fenton [38], photoelectro-Fenton [39], UV/TiO 2 /CeO 2 [40], UV/inorganic oxidants [41], persulfate/Fe 2+ /heat [42] and adsorption [32,36,43,44] for removal of various pollutants.…”

Section: Introductionmentioning

confidence: 99%

Decolorization of azo dye Everdirect Supra Red BWS in an aqueous solution by heat-activated persulfate: optimization using response surface methodology

Tunç¹

2019

Desalination and Water Treatment

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In this study, the removal of Everdirect Supra Red BWS dye via a heat-activated persulfate process was studied. Individual and interactive effects of important process parameters, that is, persulfate concentration, initial dye concentration, process temperature and reaction time, were investigated using the response surface methodology. The high determination coefficient value (R 2 = 0.9948) of the quadratic model showed that the model was accurate in predicting the experimental results. The experimental results corresponded well with the predicted models. Using the desirability function, the optimum conditions were found to be 2,375 mg L-1 persulfate concentration, 87.51 mg L-1 dye concentration, 62.5°C process temperature and 35 min reaction time, which resulted in the dye removal efficiency of 97.63%. The effects of radical scavengers on the dye degradation were also evaluated. The results indicated that SO 4 •− was more dominant in the oxidation process. Moreover, the effect of various salts such as Na 2 SO 4 and Na 2 CO 3 on the dye removal was also examined. The dye removal level slightly decreased in the presence of Na 2 SO 4 , while Na 2 CO 3 did not cause a negative effect on the performance of this process.

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Optimization of UV/inorganic oxidants system efficiency for photooxidative removal of an azo textile dye

Cited by 17 publications

References 39 publications

Investigating the Performance of UV/PS/Tio2nps and UV/PI/Tio2nps Processes on Paraquat Herbicide Degradation in Aqueous Media: Statistical Optimization, Kinetic Study, and Estimation of Electrical Energy Consumption

Investigating the Performance of UV/PS/Tio2nps and UV/PI/Tio2nps Processes on Paraquat Herbicide Degradation in Aqueous Media: Statistical Optimization, Kinetic Study, and Estimation of Electrical Energy Consumption

Investigating the synergistic effect of UV/PS/TiO2 and UV/PI/TiO2 processes on paraquat herbicide degradation in media aqueous: statistical optimization, kinetic study, and estimation of electrical energy consumption

Decolorization of azo dye Everdirect Supra Red BWS in an aqueous solution by heat-activated persulfate: optimization using response surface methodology

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