Ultraviolet (UV) light-activated persulfate oxidation of sulfamethazine in water

Gao, Yu; Gao, Nai Yun; Deng, Yang; Yang, Yi; Ma, Yuexin

doi:10.1016/j.cej.2012.04.084

Cited by 424 publications

(111 citation statements)

References 25 publications

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“…This could be attributed to this fact that only a limited amount of HO Á is formed in the bulk solution in the presence of UV alone, and presumably, the removal efficiency was due to direct photolysis or hydrolysis of antibiotic. This result is similar to the results reported by and Gao et al (2012), who studied degradation of amoxicillin, ampicillin, cloxacillin, sulfamethoxazole, and TC antibiotics by UV process. However, in the presence of TiO 2 , much faster degradation of TC (83.2 %) and higher mineralization level (50.2 % removal of COD) occurred compared to UV irradiation only.…”

Section: Resultssupporting

confidence: 92%

Photocatalytic degradation of tetracycline using nanosized titanium dioxide in aqueous solution

Safari

Hoseini

Seyedsalehi

et al. 2014

Int. J. Environ. Sci. Technol.

250

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The aim of the study was to investigate the degradation kinetics of tetracycline antibiotic by nanosized titanium dioxide under ultraviolet irradiation. Enhancement of photocatalysis by addition of Hydrogen peroxide was also evaluated. Various experimental parameters such as initial tetracycline concentrations, initial titanium dioxide concentration, initial pH, reaction times, initial Hydrogen peroxide concentrations, as well as water matrix using ultrapure water, drinking water and secondary effluent were investigated. The initial rate of photocatalytic degradation of tetracycline well fitted the Langmuir-Hinshelwood kinetic model (R 2 = 0.9926) with a reaction rate constant of 1.4 mg/L min. The degradation rate depended on initial tetracycline concentration and initial pH. The degradation rate also increased with higher titanium dioxide density and reached a plateau at titanium dioxide concentration of 1.0 g/L. The tetracycline degradation rate was higher in drinking water compared to ultrapure water. The addition of Hydrogen peroxide to titanium dioxide suspension significantly enhanced the tetracycline degradation rate and substantially reduced the time required to degrade 100 % of tetracycline. Changes of chemical oxygen demand values during photolysis indicated that tetracycline transformed into intermediate products without complete mineralization. The ultraviolet visible spectra obtained before and after ultraviolet irradiation in the presence of titanium dioxide can indicate the formation of 4a,12a-anhydro-4-oxo-4-dimethylaminotetracycline.

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Section: Resultssupporting

confidence: 92%

Photocatalytic degradation of tetracycline using nanosized titanium dioxide in aqueous solution

Safari

Hoseini

Seyedsalehi

et al. 2014

Int. J. Environ. Sci. Technol.

250

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“…The study reported 55% removal for COD at 50 °C. Although several literatures reported different applications in activation of persulfate to enhance its powerful oxidation by release sulfate radicals; such as heat, UV, ozone, Iron ions and high pH (Shiying et al, 2009;Abu Amr et al, 2013a;Lin et al, 2011;Furman et al, 2011;Rastogi et al, 2009;Hung et al, 2002;Gao et al, 2012), however, persulfate can be act alone as a good oxidant and can be efficiently activated with the existing of natural clay menials and inorganic components in leachate (Block et al, 2004). Furthermore, the high level of heavy metals and trace elements found in leachate can be tack place in naturally activation of persulfate.…”

Section: Resultsmentioning

confidence: 99%

Factorial design and optimization of leachate treatment using persulfate oxidation

2016

Global NEST Journal

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The current study aimed to evaluate the performance of sodium persulfate to treat stabilized landfill leachate. Factorial design with response surface methodology (RSM) was used to evaluate the interaction between operational conditions, such as persulfate dosage, pH, and reaction time, to obtain the optimum conditions. The two quadratic models obtained by RSM for COD and NH3-N removal proved to be significant models (P<0.0001). The optimum conditions obtained included a reaction time of 60 min, 4.97g S2O8 2− , dosage and pH 7. The experimental results were corresponding well with predicted models (COD and NH3-N removal rates of 45%, and 47%, respectively. The results revealed that persulfate oxidation is an efficient for pretreatment of stabilized landfill leachate.

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“…The generation of sulfate radicals during oxidation can be significantly enhanced by catalysts, such as heat and UV radiation (Eqs. (2)-(4)), which were found to improve the persulfate oxidation potential [42,43].…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, to investigate the performance of ozone in initiating sulfate radical formation from persulfate during the ozonation process, the influence of Na 2 S 2 O 8 concentration on COD, color and NH 3 -N was investigated with the optimal ozone conditions fixed at 15°C, max O 3 dosage 80 g/m 3 , reaction time 60 (min), and high pH (8.5) [17,26,43]. The initial pH (8.5) of the leachate samples was maintained.…”

Section: Resultsmentioning

confidence: 99%

Pretreatment of stabilized leachate using ozone/persulfate oxidation process

Amr

Aziz

Adlan

et al. 2013

Chemical Engineering Journal

134

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Ultraviolet (UV) light-activated persulfate oxidation of sulfamethazine in water

Cited by 424 publications

References 25 publications

Photocatalytic degradation of tetracycline using nanosized titanium dioxide in aqueous solution

Photocatalytic degradation of tetracycline using nanosized titanium dioxide in aqueous solution

Factorial design and optimization of leachate treatment using persulfate oxidation

Pretreatment of stabilized leachate using ozone/persulfate oxidation process

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