Photocatalytic degradation of sulfa drugs with TiO2, Fe salts and TiO2/FeCl3 in aquatic environment—Kinetics and degradation pathway

Baran, W.; Adamek, E.; Sobczak, Andrzej; Mąkowski, Andrzej

doi:10.1016/j.apcatb.2009.04.014

Cited by 104 publications

(53 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In recent years, it has been reported that a variety of residual antibiotics was detected in the aquatic ecosystem due to misuse and improper disposal of the medicines, and has been regarded as emerging contaminants because of their latent risk and environmental persistence even at low concentrations [1][2][3][4][5][6]. Since most of the antibiotics are tolerant to biological degradation, conventional water treatment facilities adopting biological methods cannot effectively reduce their concentrations [7,8].…”

Section: Introductionmentioning

confidence: 99%

Elucidation of the degradation pathways of sulfonamide antibiotics in a dielectric barrier discharge plasma system

Kim¹,

Kam

Mok

2015

Chemical Engineering Journal

102

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Elucidation of the degradation pathways of sulfonamide antibiotics in a dielectric barrier discharge plasma system

Kim¹,

Kam

Mok

2015

Chemical Engineering Journal

102

View full text Add to dashboard Cite

“…The intermediates during SMX degradation in the PEF process were identified by LC-MS by the peaks formed, and the molecular structure of SMX is reported in Table 1. Six intermediate compounds were identified, as shown in Table 2 [17], solar photoFenton [24], photolysis [46] and ozonation [59,60] processes during SMX degradation. Intermediate F at [M+H] + 256 mass units can be attributed to the substitution of the methyl group by • OH radical attack on the isoxazole ring, resulting in the formation of a hydroxylated structure.…”

Section: Evolution Of Aromatic Intermediates and Smx Degradation Pathmentioning

confidence: 99%

Mineralization of antibiotic sulfamethoxazole by photoelectro-Fenton treatment using activated carbon fiber cathode and under UVA irradiation

Wang

Estrada

2011

Applied Catalysis B: Environmental

139

View full text Add to dashboard Cite

a b s t r a c tThe mineralization of antibiotic sulfamethoxazole (SMX) of concentrations up to 300 mg L −1 was examined by photoelectro-Fenton (PEF) using an activated carbon fiber (ACF) cathode with UVA (365 nm) irradiation. Comparative mineralization has been studied by different methods: RuO 2 /Ti anodic oxidation (AO), AO in the presence of electrogenerated H 2 O 2 (AO-H 2 O 2 ), AO-H 2 O 2 in the presence of UVA (AO-H 2 O 2 -UVA), and both the electro-Fenton (EF) and PEF processes. PEF treatment at a low applied current of 0.36 A yields a faster and more complete depollution with 80% of the TOC removed after 6 h of electrolysis. The higher oxidative ability of the PEF process can be attributed to the additional hydroxyl radicals (• OH) produced by the photo-Fenton reaction. The 63% mineralization in the case of EF treatment was due to the formation of short intermediates, such as carboxylic acids, which were difficult to oxidise with• OH. In the AO-H 2 O 2 -UVA process, about 36% of the TOC was removed after 6 h electrolysis, while 28% of the TOC was removed in the AO-H 2 O 2 process. SMX is only slightly mineralized by the AO process, with only 25% of the TOC removed. HPLC-MS analysis allowed for up to six aromatic reaction products to be identified during the SMX degradation in the PEF process, mainly formed from the hydroxylation of the aromatic ring or/and isoxazole ring, accompanied by the substitution of the amine group (on aromatic cycle) or methyl group (on isoxazole ring) by• OH. The carboxylic acids generated, including oxalic, maleic, oxamic, formic and acetic acids, were detected by ion-exclusion chromatography. The initial organic nitrogen was mainly converted into NH 4 + along with a very small proportion of NO 3 − ion. Considering all the oxidation intermediates and end products for SMX degradation in the PEF process, a general mineralization mechanism by• OH and UVA was proposed.

show abstract

“…2). By comparing with the dose and degradation efficiency value of various photocatalysts (Baran et al 2009;Giahi et al 2013;Asfaquel Islam et al 2015;Kansal et al 2014) as shown in Table 1, TiSiO 4 is better than most photocatalysts referred in Table 1.…”

Section: Effect Of the Amount Of Catalystmentioning

confidence: 93%

Nano Photo Catalytic Degradation of the Pharmaceutical Agent Balsalazide Under UV Slurry Photo Reactor

Sikarwar

Jain

2015

Water Air Soil Pollut

View full text Add to dashboard Cite

The presence of pharmaceuticals and personal care products (PPCPs) as trace pollutants in natural surface water bodies, ground water and drinking water has recently led to some concern. Advanced oxidation processes (AOPs), which utilize free radical reactions to degrade chemical contaminates, are an alternative to traditional water treatment. Anti-inflammatory drug balsalazide (as model compounds) besides actual wastewater samples were UV photodegraded using suspended titanium silicon oxide (TiSiO 4 ) or UV/ H 2 O 2 /O 2 systems. The photodegradation was favourable in the pH 8-12.8 range. The effect of various parameters such as photocatalyst amount, balsalazide (BSZ) concentration, pH of aqueous solution, irradiation time, addition of H 2 O 2 and temperature on photocatalytic oxidation was investigated. The kinetics of the photocatalytic oxidation of BSZ in aqueous TiSiO 4 suspensions was investigated as a function of catalyst loading (2-12 mg/L) and the concentration of BSZ (0.01-0.05 mg/mL) at pH 11.5. The optimum conditions for the degradation of the BSZ have been found as 0.045 mg/mL drug concentration, pH 11.5 and 0.1 g/L catalyst dose. The results indicated that the photocatalytic degradation of BSZ was well described by pseudofirst-order kinetics according to the LangmuirHinshelwood model. The effect of temperature on the efficiency of photodegradation of BSZ was also studied in the range 278-298 K. The activation energy was calculated according to Arrhenius plot and was found equal to 24±1 kJ mol −1 for TiSiO 4 . Decolourization and mineralization of BSZ in the absence of light and/or catalyst were performed to demonstrate that the presence of light and catalyst is essential for the decolourization of this BSZ. This work adds to the global discussion on the role of the advanced oxidation processes in water treatment.

show abstract

Photocatalytic degradation of sulfa drugs with TiO2, Fe salts and TiO2/FeCl3 in aquatic environment—Kinetics and degradation pathway

Cited by 104 publications

References 37 publications

Elucidation of the degradation pathways of sulfonamide antibiotics in a dielectric barrier discharge plasma system

Elucidation of the degradation pathways of sulfonamide antibiotics in a dielectric barrier discharge plasma system

Mineralization of antibiotic sulfamethoxazole by photoelectro-Fenton treatment using activated carbon fiber cathode and under UVA irradiation

Nano Photo Catalytic Degradation of the Pharmaceutical Agent Balsalazide Under UV Slurry Photo Reactor

Contact Info

Product

Resources

About