Effect of pH and inorganic salts on the photocatalytic decolorization of methyl orange in the presence of TiO2 P25 and PC500

Bouanimba, Nour; Laid, Nassima; Zouaghi, Razika; Sehili, Tahar

doi:10.1080/19443994.2013.848667

Cited by 21 publications

(17 citation statements)

References 48 publications

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“…The decrease of efficiency of the photochemical degradation process of low-and high-molecular weight compounds was also proved in a wide range of other papers on this subject [30][31][32][33][34][35]. Moreover, the irradiation of the sulphate ions resulted in the generation of reactive sulphate anion radicals SO…”

Section: Influence Of Inorganic Anionsmentioning

confidence: 95%

Influence of Inorganic Ions and Organic Substances on the Degradation of Pharmaceutical Compound in Water Matrix

Kudlek

Dudziak

Bohdziewicz

2016

Water

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Abstract:The paper determined the influence of inorganic substances and high-molecular organic compounds on the decomposition of diclofenac, ibuprofen, and carbamazepine in the process of photocatalysis conducted with the presence of Titanium dioxide (TiO 2 ). It was determined that the presence of such ions as CO affected the increase of reaction rate constant value of diclofenac and ibuprofen decomposition. On the other hand, high molecular organic compounds present in the model effluent additionally catalysed the degradation process of pharmaceutical compounds and constituted an additional sorbent that enabled to decrease their concentration. Toxicological analysis conducted in deionized water with pharmaceutical compounds' patterns proved the production of by-products from oxidation and/or reduction of micropollutants, which was not observed for model effluent irradiation.

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Section: Influence Of Inorganic Anionsmentioning

confidence: 95%

Influence of Inorganic Ions and Organic Substances on the Degradation of Pharmaceutical Compound in Water Matrix

Kudlek

Dudziak

Bohdziewicz

2016

Water

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“…The photocatalytic degradation of MO following a five-hour period with a chloride concentration of 0, 250, 500, and 1000 mg/L was 83% ± 7%, 84% ± 1%, 84% ± 3%, and 84 ± 1%, respectively. The presence of inorganic salt (i.e., NaCl) was anticipated to decrease photocatalytic activity due to the existence of Research Article a competitive reaction between dye and chloride (Bouanimba, Laid, Zouaghi, & Sehili, 2015;Surolia, Tayade, & Jasra, 2007), especially in acidic conditions, due to anion activation (Fang, Fu, & Shang, 2014;Xiang, Fang, & Shang, 2016). The reaction rate constant between hydroxyl radicals with chloride is 10 3 M −1 s −1 at pH 7, whereas the rate constant for the oxidation of organic compounds is more than 10 7 M −1 s −1 (von Gunten, 2003a(von Gunten, ,2003b.…”

Section: Effect Of Ph Nacl Uv Lamps and Recyclability On Photocatamentioning

confidence: 99%

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

Adnan

Phattarapattamawong

2019

Water Environment Research

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This work aimed to enhance the photocatalytic degradation of methyl orange (MO) by crystallinity transformation of titanium dioxide (TiO2). In addition, the kinetic degradation of MO was determined. To transform its crystallinity, TiO2 was synthesized using a sol–gel method and calcined at between 200°C to 600°C. Calcination at a temperature of 250°C resulted in TiO2 that showed the best performance, corresponding to MO removal of 87% ± 7%. MO removal by TiO2 calcined between 250°C to 400°C was higher than for commercial TiO2 powder (Sigma‐aldrich) (62% ± 4%). TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO, while the specific surface area and surface roughness seemed to play a minor role. The photocatalytic degradation of MO was NaCl‐independent, while the photocatalytic activity increased with decreased pH. Reused TiO2 showed similar photocatalytic degradation of MO compared with pristine TiO2, at 84 ± 2%. The oxidation kinetics of TiO2 calcined at 250°C were fitted to the Langmuir–Hinshelwood model (R2 = 0.9134). The kr and Ks values were 0.027 mg L−1 min−1 and 0.621 L/mg, respectively. Crystallinity transformation was a major factor in the enhancement of photocatalytic degradation of MO. Practitioner points Photocatalytic activity of TiO2 depends on calcination temperature, pH, and a number of UVC lamps. TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO.

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“…The experimental considerations of the study consider the use of synthesized and commercial samples of TiO 2 , supported on borosilicate rings (raschig rings) (40), where DR1 photodegradation efficiencies where tested in the presence of sodium dodecylsulfate, as model surfactant (41–43), at concentrations below, at and above the CMC. The behavior of the TiO 2 /SDS systems was studied in the presence of additives, such as H 2 O 2 , NaCl, Na 2 SO 4 , and Na 2 CO 3 , of reported influence over TiO 2 catalyzed photodegradation of organic molecules (44), to determine whether or not the presence of surfactant has any further effect on the influence of such additives on the photodegradation of the dye.…”

Section: Introductionmentioning

confidence: 99%

TiO₂ Photocatalyzed Degradation of the Azo Dye Disperse Red 1 in Aqueous Micellar Environments^†

Pino

Calderón

Castro

2020

Photochem & Photobiology

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The photoinduced degradation of the azo dye Disperse Red 1 was studied in a microheterogeneous system comprising titanium oxide (TiO2) and sodium dodecyl sulfate, exposed to UV light. Degussa P25, Anatase and TiO2 synthesized in acidic conditions were supported on raschig rings. The TiO2 photocatalyzed degradation is enhanced in the vicinity of the surfactant critical micelle value. Further increase on the surfactant concentration leads to a loss in photodegradation performance up to values equivalent to that observed without surfactant. Surfactant influence can be explained by two different phenomena taking place. The increasing concentration of surfactant leads to an increase in micellar concentration, inducing the incorporation of the dye to the hydrophobic moiety of the micelles, rendering the hydroxyl radical unable to interact with the dye. Similarly, the increased concentration of micelles at the photocatalyst/water interface might lead to a decrease in the number of active sites on the TiO2 surface able to either generate reactive species and/or interact with de dye molecules. Additives such as H2O2, NaCl, Na2SO4, and Na2CO3 are able to override the influence of the surfactant both positively and negatively, being the final outcome of the influence highly dependent on the crystalline form of the TiO2 photocatalyst.

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Effect of pH and inorganic salts on the photocatalytic decolorization of methyl orange in the presence of TiO2 P25 and PC500

Cited by 21 publications

References 48 publications

Influence of Inorganic Ions and Organic Substances on the Degradation of Pharmaceutical Compound in Water Matrix

Influence of Inorganic Ions and Organic Substances on the Degradation of Pharmaceutical Compound in Water Matrix

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

TiO₂ Photocatalyzed Degradation of the Azo Dye Disperse Red 1 in Aqueous Micellar Environments^†

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Effect of pH and inorganic salts on the photocatalytic decolorization of methyl orange in the presence of TiO2 P25 and PC500

Cited by 21 publications

References 48 publications

Influence of Inorganic Ions and Organic Substances on the Degradation of Pharmaceutical Compound in Water Matrix

Influence of Inorganic Ions and Organic Substances on the Degradation of Pharmaceutical Compound in Water Matrix

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

TiO2 Photocatalyzed Degradation of the Azo Dye Disperse Red 1 in Aqueous Micellar Environments†

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TiO₂ Photocatalyzed Degradation of the Azo Dye Disperse Red 1 in Aqueous Micellar Environments^†