Comparing the efficacy of UVC, UVC/ZnO and VUV processes for oxidation of organophosphate pesticides in water

Ciprofloxacin (CIP) is used synthetic therapeutic antibiotic that is not easily biodegradable and is a water pollutant. The advanced oxidation process method is heterogeneous photocatalysis and for the first time, we used the photocatalytic UVC light/ZnO reaction for the degradation of CIP in contaminated water. The ZnO nanoparticles were synthesized via the sol-gel method. We used a 9-W mercury lamp, which was inserted in the solution to emit UVC light. The optimum conditions for the degradation of CIP in aqueous solution containing 10 mg/L of CIP were a pH of 5.0, 0.15 g/L of ZnO, a stirring speed of 600 rpm and an irradiation time of 140 min. Also the relative standard deviation (RSD) did not exceed 7%. From the kinetic studies, the reactions followed approximately a pseudo-first-order kinetic with the rate constant of 0.032 min 21 . This method was efficiently used for the degradation of CIP in aqueous solutions. 58

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“…The efficient decrease in the CIP degradation in the presence of

{HPO}_{4}^{2 -}

can be related to scavenging of • OH by this anion (Moussavi et al . )…”

Section: Resultsmentioning

confidence: 99%

Application of low‐voltage UVC light and synthetic ZnO nanoparticles to photocatalytic degradation of ciprofloxacin in aqueous sample solutions

Eskandari

Goudarzi

Moussavi

2017

Water & Environment J

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“…As shown, the percentage of Cr(VI) photoreduction increased linearly from 9% at an HRT of 1 min to 91.7% at an HRT of 6 min. This increase was a result of the increase in exposure time of the Cr(VI) anions to the increased number of electrons available, which in turn increased the percentage of reduction [30]. Fig.…”

Section: Effect Of Hrt On Cr(vi) Reduction In Continuous-flow Vuv Phomentioning

confidence: 99%

“…The vacuum-UV (VUV) method is an advanced homogeneous process in which oxidizing radical species of Å H and Å OH and reducing free electrons are generated through homolysis and photo-ionization of water molecules using a UV lamp that emits radiation at a wavelength of 185 nm [30][31][32][33]. Both oxidation and reduction reactions can occur in the VUV process.…”

Section: Introductionmentioning

confidence: 99%

“…Both oxidation and reduction reactions can occur in the VUV process. Its potential for oxidation reactions has been exploited for degradation of several organic contaminants, including pesticides [30], naproxen [31], natural organic matter [32] and 2,4-D [33]. Reduction by VUV can be exploited for the reduction of reducible toxic contaminants such as Cr(VI).…”

Section: Introductionmentioning

confidence: 99%

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Advanced reduction of Cr(VI) in real chrome-plating wastewater using a VUV photoreactor: Batch and continuous-flow experiments

Moussavi

Jiani

Shekoohiyan

2015

Separation and Purification Technology

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“…7a shows, the highest amount of reduction effect was related to nitrate (30% reduction effect). This observation can be due to the absorption of UV by the nitrate which prevents the hydroxyl radicals generation reactions (Moussavi et al 2014). The decrease in ceftriaxone degradation rate in the presence of sulfate and phosphate can be related to •OH scavenging by these anions (Arany et al 2014).…”

Section: Effect Of Anions On Degradation Of Ceftriaxone In Uvc/h 2 O mentioning

confidence: 99%

Photodegradation of ceftriaxone in aqueous solution by using UVC and UVC/H2O2 oxidation processes

et al. 2019

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This study investigated the performance of UVC/H 2 O 2 and UVC processes for the degradation and mineralization of ceftriaxone as an antibiotic. The highest ceftriaxone degradation was obtained at a solution pH of 5 and H 2 O 2 concentration of 10 mg/L. The apparent rate constant of ceftriaxone degradation was found to be 0.0302, 0.0165, and 0.0065 min −1 in the UVC/H 2 O 2 process for the initial ceftriaxone concentrations of 5, 10, and 20 mg/L, respectively. Degradation and mineralization efficiencies of ceftriaxone was obtained to be 100% and 58%, respectively, in UVC/H 2 O 2 process at reaction time of 120 min, whereas only 61% and 2.5% of ceftriaxone could be degraded and mineralized by UVC. The synergistic effect of UVC/H 2 O 2 was found to be 35%. The presence of anionic species improved the photolysis efficiency which degraded ceftriaxone from 61 to 83%, while, in the UVC/H 2 O 2 process, ability degradation declined from 100 to 70%. The efficiency of UVC/H 2 O 2 and UVC process was not greatly affected in real tap water. Besides, the reduction patterns in the UVC/H 2 O 2 and UVC processes were better described by pseudo-first-and second-order kinetics model with a reaction rate constant of 0.0165 and 0.0012 min −1 , respectively. The rate constant of ceftriaxone degradation in the UVC/H 2 O 2 process and at the presence of radical scavenger was found to be around 3.3 times lower than the one in its absence.

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Comparing the efficacy of UVC, UVC/ZnO and VUV processes for oxidation of organophosphate pesticides in water

Cited by 58 publications

References 35 publications

Application of low‐voltage UVC light and synthetic ZnO nanoparticles to photocatalytic degradation of ciprofloxacin in aqueous sample solutions

Application of low‐voltage UVC light and synthetic ZnO nanoparticles to photocatalytic degradation of ciprofloxacin in aqueous sample solutions

Advanced reduction of Cr(VI) in real chrome-plating wastewater using a VUV photoreactor: Batch and continuous-flow experiments

Photodegradation of ceftriaxone in aqueous solution by using UVC and UVC/H2O2 oxidation processes

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