Sono-photo activation of percarbonate for the degradation of organic dye: The effect of water matrix and identification of by-products

Eslami, Akbar; Mehdipour, Fayyaz; Lin, Kun‐Yi Andrew; Maleksari, Hajar Sharifi; Mirzaei, Fatemeh; Ghanbari, Farshid

doi:10.1016/j.jwpe.2019.100998

Cited by 57 publications

(25 citation statements)

References 51 publications

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“…is observation may be explained as follows: at lower H 2 O 2 : FeSO 4 concentration ratios, the H 2 O 2 was not enough to oxidize the organic pollutants; therefore, the COD removal was low. However, when concentration ratios were too high, H 2 O 2 may contribute to the COD and exhibit as hydroxyl radical scavenger [19,28,29] as shown by equation (3). e product, hydroperoxyl radical, is an oxidizing radical, but its oxidizing ability is lower than that of hydroxyl radical (OH • ), leading to a decrease in treatment efficiency.…”

Section: Results Formentioning

confidence: 99%

Treatment of Cutting Oil-in-Water Emulsion by Combining Flocculation and Fenton Oxidation

Nam

Hiền

Huyền

et al. 2021

Journal of Chemistry

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Recently, the disposal of waste oil-in-water cutting emulsion has become an urgent issue because of its extremely high chemical oxygen demand (COD). The present work focuses on treating the waste cutting emulsion generated from the Samsung Thai-Nguyen factory in Vietnam. This work used multistage methods to treat the waste cutting emulsion to meet the wastewater disposal requirement and characterize the oil recovered. The multistage methods consist of the flocculation method (stage 1) and Fenton oxidation (stage 2). The wastewater after stage 1 treatment has a COD reduction efficiency of 98.24% at the condition of pH 5, Al2(SO4)3 2 g/L, C-PAM 12 mg/L, stirring speed 50 rpm, and stirring time 15 minutes. At that condition, the COD value decreased from 147200 mg/L to 2484 mg/L. After stage 2, the COD value further decreased from 2484 mg/L to 85.4 mg/L with total COD removal efficiency increasing to 99.9% at the optimum conditions of pH 3, H2O2 : FeSO4 concentration ratio of 10 : 1, and FeSO4 concentration of 14.04 g/L. After the stage 2 treatment, the wastewater with the COD value of 85.4 mg/L and BOD5 value of 30 mg/L satisfied the Vietnam standard grade B and grade A, respectively, for industrial wastewater. The oil recovered from the treatment has a heating value of 38095 ± 8 kJ/kg, and thus, it could be reusable as fuel gas.

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Section: Results Formentioning

confidence: 99%

Treatment of Cutting Oil-in-Water Emulsion by Combining Flocculation and Fenton Oxidation

Nam

Hiền

Huyền

et al. 2021

Journal of Chemistry

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“…According to the results, hydroxyl and superoxide are the radicals with the highest concentration in the process. This work demonstrated that the photocatalyst/UVC/US system could be a new efficient method to degrade organic pollutants in water [54] .…”

Section: Application Of the Ultrasound As An Advanced Oxidation Process (Aop)mentioning

confidence: 87%

“…Eslami et al used a relatively new method that has gained attention in recent years, consisting of sodium percarbonate (Na 2 CO 3 ·1.5H 2 O 2 ) to generate radicals in solution [54] . The US was used to activate the photocatalyst and promote Orange Acid 7 degradation ( Fig.…”

Section: Application Of the Ultrasound As An Advanced Oxidation Process (Aop)mentioning

confidence: 99%

“…The US was used to activate the photocatalyst and promote Orange Acid 7 degradation ( Fig. 3 f) in an aqueous solution [54] . According to the authors, ultrasound and UV radiation emitted from a diode (UVC-LEDs) were efficient in generating radicals in the presence of a photocatalyst.…”

Section: Application Of the Ultrasound As An Advanced Oxidation Process (Aop)mentioning

confidence: 99%

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Ultrasound for the remediation of contaminated waters with persistent organic pollutants: A short review

Andrade

Augusti

Lima

2021

Ultrasonics Sonochemistry

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“…Recombination of free radicals also possibly decreased the mitigation capacity according to the following equations ( 14) and ( 15) [40].…”

Section: Formation Of Oxidizing Agents O 3 H 2 O 2 and •Ohmentioning

confidence: 99%

Removal of Antibiotics from Real Hospital Wastewater by Cold Plasma Technique

Nguyen

Tran

et al. 2021

Journal of Chemistry

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Hospital wastewater contains a complex mixture of bioactive substances and microorganisms that are deleterious to humans and aquatic animals. In this study, four antibiotics, namely, ofloxacin, ciprofloxacin, cefuroxime, and amoxicillin, respectively, from the wastewater of seven hospitals in Ho Chi Minh City, Vietnam, were monitored. The results revealed that the wastewater from these hospitals is contaminated with at least one of the antibiotics. In addition, the degradation capacity of the antibiotics by the wastewater treatment plant at one of the hospitals by the cold plasma technique was investigated. Furthermore, effects of the variation in pH, interelectrode distance, applied voltage, and reaction time on the removal efficiency were investigated in terms of the reduction in antibiotics concentration, COD, and ammonia. Ciprofloxacin, cefuroxime, COD, and ammonia were almost eliminated, while ofloxacin and amoxicillin were reduced by more than 72% under optimum conditions (initial pH of 10, reaction time of 15 min, applied voltage of 30 kV, and interelectrode distance of 10 mm). All of these factors affected the removal efficiency. The removal efficiency was most robust in the first 5 min, and it increased with the increase in the reaction time. However, the removal efficiency tended to saturate over time, while it decreased with the increase in the reaction time. With an applied voltage of 30 kV onwards, the removal efficiency was not significantly different. Most of the pollutants were predominately eliminated under slightly alkaline conditions (pH of ∼10). In addition, primary oxidants in the aqueous phase, such as O3, H2O2, and ⋅OH, were generated. Besides, the obtained results also revealed that the decomposition of ciprofloxacin and cefuroxime follows the first-order reaction kinetics; meanwhile, the third-order reaction kinetics was most likely for the decomposition of ofloxacin and amoxicillin.

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Sono-photo activation of percarbonate for the degradation of organic dye: The effect of water matrix and identification of by-products

Cited by 57 publications

References 51 publications

Treatment of Cutting Oil-in-Water Emulsion by Combining Flocculation and Fenton Oxidation

Treatment of Cutting Oil-in-Water Emulsion by Combining Flocculation and Fenton Oxidation

Ultrasound for the remediation of contaminated waters with persistent organic pollutants: A short review

Removal of Antibiotics from Real Hospital Wastewater by Cold Plasma Technique

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