Investigating the aerated VUV/PS process simultaneously generating hydroxyl and sulfate radicals for the oxidation of cyanide in aqueous solution and industrial wastewater

Moussavi, Gholamreza; Pourakbar, Mojtaba; Aghayani, Ehsan; Mahdavianpour, Mostafa

doi:10.1016/j.cej.2018.05.178

Cited by 62 publications

(29 citation statements)

References 49 publications

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“…The simultaneous, multi-pathway mediatedFQs degradation in UV/K 2 S 2 O 8 could contribute to the enhancement of the reaction rate.One interesting observation is the synergistic effect arising from the combination of chemical addition and VUV irradiation, which accounted for the fastest degradation rate of FQs. The k obs values of VUV/H 2 O 2 and VUV/K 2 S 2 O 8 for OFX and NOF were comparable to the k obs of CEX at the same condition (> 2.0 min −1 ), which can be attributed to the generation of abundant reactive radical species of • OH/SO 4 •− in the modified VUV processes(Moussavi et al, 2018a). The VUV/H 2 O 2 process was reported to allow better degradation of clofibric acid (over 99% removal efficiency) compared to that by either UV/H 2 O 2 or VUV alone…”

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confidence: 64%

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Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H2O2 and K2S2O8 in the presence of halide ions

Sun

Cho

Graham

et al. 2019

Science of The Total Environment

107

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In this work, the degradation of cefalexin, norfloxacin, and ofloxacin was examined via various advanced oxidation processes (AOPs). Direct photolysis by ultraviolet (UV) and vacuum ultra violet (VUV) was less effective for the degradation of fluoroquinolone antibiotics such as norfloxacin and ofloxacin than that of cefalexin. Both hydrogen peroxide (H 2 O 2) and potassium persulfate (K 2 S 2 O 8) assisted UV/VUV process remarkably enhanced fluoroquinolone degradation. The addition of K 2 S 2 O 8 was superior to H 2 O 2 under VUV irradiation, with the best removal efficiency of norfloxacin and ofloxacin being almost 100% within 3 min in the presence of VUV/K 2 S 2 O 8. The ofloxacin degradation rate was accelerated as concentrations of H 2 O 2 and K 2 S 2 O 8 was increased to 3 mM, but the degradation rate was slightly decreased with excess H 2 O 2 (> 3 mM). The performance of modified VUV processes (i.e., VUV/H 2 O 2 and VUV/K 2 S 2 O 8) was inhibited at highly alkaline condition (pH 11). The coexistence of halides (Cl − and Br −) enhanced antibiotics degradation via the modified VUV processes, but the reaction was almost unaffected in the presence of single halides. This study demonstrated that modified VUV processes (especially VUV/K 2 S 2 O 8) are efficient for eliminating fluoroquinolone antibiotics from water, which can be considered as a clean and green method for the treatment of antibiotics-containing industrial wastewater.

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confidence: 64%

“…(Li et al, 2011). Recently, Moussavi et al (2018a) revealed the enhancement of degradation of cyanide in industrial wastewater when employing VUV/K 2 S 2 O 8 process, possibly due to the simultaneous production of reactive radical species in a short period of time.…”

Section: Degradation Of Ofx Nof and Cex By Uv-and Vuv Based Processesmentioning

confidence: 99%

Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H2O2 and K2S2O8 in the presence of halide ions

Sun

Cho

Graham

et al. 2019

Science of The Total Environment

107

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“…Fig. 5 shows that by the addition of tert-butanol, as a most common • OH scavenger, the ACT degradation did not change considerably (Moussavi et al, 2018), while the addition of salicylic acid reduced the ACT degradation efficiency to 41.6%. This can be explained by the reaction rate constant which has been reported 1.7 × 10 9 M − 1 s − 1 for ACT reaction with • OH (Yang et al, 2009), while the reaction rate constants for the reaction of • OH with the tert-butanol, and salicylic acid have been reported 6 × 10 8 and 2.2 × 10 10 M − 1 s − 1 , respectively (Crittenden et al, 2012).…”

Section: Mechanism Of Act Degradation In Copmentioning

confidence: 99%

Synthesis and characterization of SnO2 crystalline nanoparticles: A new approach for enhancing the catalytic ozonation of acetaminophen

Rashidashmagh

Bennani

Tizghadam-Ghazani

et al. 2021

Journal of Hazardous Materials

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A novel sol-gel method was employed in this study to efficiently synthesize SnO 2 nanoparticles to catalyze the ozonation of acetaminophen (ACT) from aqueous solutions. The influence of various parameters including Sn source, type of capping and alkaline agents, and calcination temperature on the catalytic activity of the SnO 2 preparations was investigated. The SnO 2 nanoparticles prepared by tin tetrachloride as Sn source, NaOH as gelatin agent, CTAB as capping agent and at calcination temperature of 550 • C (SnNaC-550) exhibited the maximum performance in the catalysis of ACT. The optimized catalyst (SnNaC-550) had spherical-homogeneous and cubic-shaped nanocrystalline particles with 5.5 nm mean particle size and a BET surface area of 81 m 2 /g, which resulted in 98% degradation and 84% mineralization of 50 mg/L ACT at 20 and 30 min reaction time, respectively when combined with ozonation (COP). Based on the radical scavenger experiments, • OH was the major oxidizing agent involved in the removal of ACT. LC/MS analysis showed that short-chain carboxylic acids were the main intermediates. Furthermore, the SnNaC-550 catalytic activity was preserved after four successive cycles. Collectively, the new method has the potential to efficiently synthesize stable and reusable SnO 2 nanoparticles to catalyze the ozonation of ACT from aquatic environments.

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“…The second-order rate constant of CNwith Fe(VI) is about 605 M -1 $s -1 at pH 8.0 (Sharma et al, 1998). Although it is lower than those of CNwith O 3 , HClO, and H 2 O 2 (Gurol and Bremen, 1985;Kepa et al, 2008;Moussavi et al, 2018), combing the oxidation capability of Fe(VI) and the coagulation capability of iron (III) offers an efficient approach to eliminate the CN -complexed heavy metals from water. It was found that 91.23% of CN -(1.0 mM) can be oxidized and 98.96% of Cu 2+ (0.094 mM) can be removed in minutes when 2.0 mM Fe(VI) was adopted to deal with the industrial wastewater containing cyanide-complexed Cu 2+ (Seung-Mok and Diwakar, 2009).…”

Section: Heavy Metalsmentioning

confidence: 99%

Application of Fe(VI) in abating contaminants in water: State of art and knowledge gaps

Wang

Shao

Qiao

et al. 2020

Front. Environ. Sci. Eng.

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The past two decades have witnessed the rapid development and wide application of Fe(VI) in the field of water de-contamination because of its environmentally benign character. Fe(VI) has been mainly applied as a highly efficient oxidant/disinfectant for the selective elimination of contaminants. The in situ generated iron(III) (hydr)oxides with the function of adsorption/coagulation can further increase the removal of contaminants by Fe(VI) in some cases. Because of the limitations of Fe(VI) per se, various modified methods have been developed to improve the performance of Fe(VI) oxidation technology. Based on the published literature, this paper summarized the current views on the intrinsic properties of Fe(VI) with the emphasis on the self-decay mechanism of Fe(VI). The applications of Fe (VI) as a sole oxidant for decomposing organic contaminants rich in electron-donating moieties, as a bi-functional reagent (both oxidant and coagulant) for eliminating some special contaminants, and as a disinfectant for inactivating microorganisms were systematically summarized. Moreover, the difficulties in synthesizing and preserving Fe(VI), which limits the large-scale application of Fe (VI), and the potential formation of toxic byproducts during Fe(VI) application were presented. This paper also systematically reviewed the important nodes in developing methods to improve the performance of Fe(VI) as oxidant or disinfectant in the past two decades, and proposed the future research needs for the development of Fe(VI) technologies.

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Investigating the aerated VUV/PS process simultaneously generating hydroxyl and sulfate radicals for the oxidation of cyanide in aqueous solution and industrial wastewater

Cited by 62 publications

References 49 publications

Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H2O2 and K2S2O8 in the presence of halide ions

Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H2O2 and K2S2O8 in the presence of halide ions

Synthesis and characterization of SnO2 crystalline nanoparticles: A new approach for enhancing the catalytic ozonation of acetaminophen

Application of Fe(VI) in abating contaminants in water: State of art and knowledge gaps

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