The photo-fenton reaction and the TiO2/UV process for waste water treatment − novel developments

Bauer, R.; Waldner, Georg; Fallmann, H.; Hager, S.; Klare, M.; Krutzler, T.; Malato, S.; Maletzky, P.

doi:10.1016/s0920-5861(99)00108-x

Cited by 285 publications

(79 citation statements)

References 7 publications

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“…The feasibility of AOP for wastewater treatment is enhanced by the fact that they offer multiple means for ·OH generation. Literatures show that ·OH with a high oxidizing potential (Tony et al 2012) can be generated through ozonation (Gozzi et al 2012), Fenton process, Fenton-like process (Prousek et al 2007, Duarte and Madeira 2010, Wasewar et al 2011, photochemical oxidation, electrochemical oxidation (Jain et al 2011, Babuponnusami and Muthukumar 2012, H 2 O 2 /UV, UV/O 3 Peres 2007, Schrank et al 2007), photocatalysis oxidation (Bauer et al 1993, Karthikeyan et al 2011, and sonolysis (Zheng et al 2007).…”

Section: Advanced Oxidation Processesmentioning

confidence: 99%

“…This process generates ·OH through the reaction of H 2 O 2 and ferrous salt in acidic environment. The use of Fenton processes for treating various types of wastewater has also been studied (Bauer et al 1993, Perkowski et al 2000, Modenes et al 2012, Tony et al 2012, Borba et al 2013 , as depicted in Equation (8) (Rigg et al 1954, Walling 1975, Buxton et al 1988, Neyens and Baeyens 2003. The generation of the radicals involves a complex reaction sequence in an aqueous solution.…”

Section: Homogeneous Fenton Processmentioning

confidence: 99%

“…The most widely researched AOPs include heterogeneous photocatalytic oxidation (Bauer et al 1993), ozone (O 3 )-based processes (Meric et al 2005), Fenton reaction, photo-Fenton reaction (Bouafia-Chergui et al 2010, Borba et al 2013, and electrochemical oxidation. These techniques are promising in treating contaminated groundwater, surface H 2 O, and wastewater containing nonbiodegradable organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

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Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Buthiyappan

Raman

Daud

2016

Reviews in Chemical Engineering

236

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AbstractIn the past few years, there have been many researches on the use of different types of homogenous catalyst for the degradation of textile wastewater in conventional advanced oxidation processes (AOPs). However, homogenous AOPs suffer from few limitations, including large consumption of chemicals, acidic pH, high cost of hydrogen peroxide, generation of iron sludge, and necessity of post-treatment. Therefore, recently, there have been more researches that focus on improving the performance of conventional AOPs using heterogeneous catalysts such as titanium dioxide, nanomaterials, metal oxides, zeolite, hematite, goethite, magnetite, and activated carbon (AC). Besides, different supports such as AC that have been incorporated with transition metals and clays have been proven to have excellent catalytic activity in AOPs. This paper presents a comprehensive review of advances and prospects of catalytic AOPs for the decontamination of a wide range of synthetic and real textile wastewater. This review provides an up-to-date critical review of the information on the degradation of various textile dyes by a wide range of heterogeneous catalysts and adsorbents. The future challenges of AOPs, including chemical consumption, toxicity assessment, reactor design, and limitation of catalysts, are discussed in this paper. In addition, this paper also discusses the presence of ions, generation of by-products, and industrial applications of AOPs. Special emphasis is given to recent studies and large-scale combination of AOPs for wastewater treatment. This review paper concludes that more studies are needed for the kinetics, reactor design, and modeling of hybrid AOPs and the production of their corresponding intermediate products and secondary pollutants. A better economic model should also be developed to predict the cost of AOPs, as the treatment cost varies with dyes and textile effluents.

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Section: Advanced Oxidation Processesmentioning

confidence: 99%

Section: Homogeneous Fenton Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Buthiyappan

Raman

Daud

2016

Reviews in Chemical Engineering

236

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“…AOPs as an environmentally friendly and green technology produce a very powerful oxidizing agent, hydroxyl radical • OH, which appears to be an alternative for the degradation of NSAIDs -especially at low concentrations [6]. One of the AOPs is the heterogeneous photocatalysis process, which use semiconductors such as ZnO, CdS, and TiO 2 under UV/visible light as a powerful technique for removing recalcitrant organic pollutants [7][8].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Parameters on Nanophotocatalytic Degradation of Ibuprofen Using UVC/ZnO Processes by Response Surface Methodology

Rastkari¹,

Eslami²,

Nasseri³

et al. 2017

Pol. J. Environ. Stud.

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Due to the increasing importance of low-concentrated pollution of water resources, the photocatalytic decomposition of ibuprofen down to low ppm concentrations over zinc oxide catalyst has been studied. The aim of this work was to evaluate the degradation of the non-steroidal anti-inflammatory drug (NSAID) ibuprofen (IBP) using heterogeneous ZnO photocatalyst under UV-C irradiation. The photo catalyst was characterized by field emission scanning electron microscope (FE-SEM) and x-ray diffraction (XRD). The photocatalytic activity of ZnO nanoparticle was evaluated in a cylindrical glass reactor under VU-C irradiation light. Central composite design (CCD) and response surface methodology (RSM) were employed for modeling and optimizing the IBP degradation under different variables such as initial pH, ZnO loading, humic acid concentration, initial IBP concentration, and reaction time. The results of our experiments showed that the reaction time had its highest positive effect on IBP degradation. The correlation coefficient (R 2 ) value of 0.856 indicated a good agreement between the experimental results and the model predictions. Optimization results showed that the maximum IBP degradation was attained at optimum conditions of pH 6.7, catalyst loading 583 mg/L, initial IBP concentration 1.5 mg/L, humic acid concentration 54 mg/L, and reaction time of 95 min. Under these conditions we achieved maximum IBP removal efficiency of 82.97%. In conclusion, ZnO was found to be an effective photo catalyst and a promising alternative for producing free OH radicals for degradation of ibuprofen as an emerging pollutant in water resources.

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“…96,[102][103][104] Many publications report that test compounds are mineralized into harmless byproducts, but the measurement of compound disappearance is not sufficient to ensure the absence of by-products. The generation of a variety of organic intermediates (in some cases more toxic and persistent than the starting substrate) during heterogeneous photo catalysis has been noted if the treatment is not continued to complete mineralization.…”

Section: Photo Catalytic Transformation Of Organic Compoundsmentioning

confidence: 99%

Toxicity Associated with the Photo Catalytic and Photo Stable Forms of Titanium Dioxide Nanoparticles Used in Sunscreen lotion

Pulvin¹

2015

MOJT

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Abbreviations: IARC, international agency for research on cancer; UV, ultraviolet; QD, quantum dot; ROS, reactive oxygen species; PBS, phosphate buffered saline; CB, conduction band IntroductionThe properties of materials change as their size approaches the nano particle scale, which is generally considered to be that with at least one dimension of 100nm or less. The toxicity of nanoparticles has been linked to such characteristics as elemental composition, charge, shape, Crystallinity, surface area, solubility and surface chemistry/ derivatization. [1][2][3][4][5][6] Understanding the nano particle-cell interaction is thought to be critical for the safe development of nano materials. 7 It seems unlikely that the potential toxicity of nanoparticles and the underlying mechanisms can be predicted or explained by any single unifying concept.This review is focused on Titania (TiO 2 ) for which there is substantial interest in the chemical, biological, and industrial worlds because of its fascinating and useful physicochemical properties. Currently, information describing the relative health and environmental risks associated with nano-TiO 2 is severely lacking. Only recently, critical questions regarding the potential human health and environmental impact of nano-TiO 2 have been raised. [8][9][10][11] TiO 2 particles have long been considered to pose little risk to respiratory health because they are both chemically and thermally stable. 12 However, TiO 2 is classified as a Group 2B carcinogen by the International Agency for Research on Cancer (IARC) based on the findings of lung tumor induction in female rats. 13,14 Nano-TiO 2 is attractive for use in a large number of applications based on its unique optical and photo catalytic properties, tunable band gap, thermal stability, chemical resistance and hardness.15Because of the relatively large band-gap, the particles absorb the higher-energy (shorter wavelength) ultraviolet radiation making it a useful constituent in sunscreen products. TiO 2 photo catalysis is widely used in the fields of wastewater treatment, 16 sterilization, 17 self-cleaning, 18 hydrogen evolution, 19 and photoelectron chemical conversion. 20 Normally, TiO 2 can only be excited with ultraviolet (UV) light because of its wide band gap, 21 although this is considered a drawback when photo catalytic conversion is desired under visible light. The crystalline structure is the major factor determining the band gap, but secondary factors include the particle size and the presence of defects (physical or chemical). 22,23 A large surface-tomass ratio of the nanoparticles helps to promote catalytic reactions, and increases their ability to absorb and carry other compounds. Their surface reactivity originates from quantum phenomena that can make nano-TiO 2 seemingly unpredictable. 24Engineered nano-TiO 2 is designed to impart specific characteristics that vary according to their use. Aside from unique nanoscale properties (size, Crystallinity, reactivity, and thermodynamics), nanoTiO 2 may be funct...

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The photo-fenton reaction and the TiO2/UV process for waste water treatment − novel developments

Cited by 285 publications

References 7 publications

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Optimizing Parameters on Nanophotocatalytic Degradation of Ibuprofen Using UVC/ZnO Processes by Response Surface Methodology

Toxicity Associated with the Photo Catalytic and Photo Stable Forms of Titanium Dioxide Nanoparticles Used in Sunscreen lotion

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