Oxidation of aromatic compounds with UV radiation/ozone/hydrogen peroxide

Mokrini, Asmae; Ousse, D.; Esplugas, Santiago

doi:10.2166/wst.1997.0095

Cited by 76 publications

(59 citation statements)

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“…Because of the high cost of ozone generation, this combination makes the process economically feasible [50]. Several factors limit the usefulness of the peroxonation process such as important energetic consumption, low water solubility of ozone, and its sensitivity to several factors [51].…”

Section: Ozonationmentioning

confidence: 99%

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Treatment of Antibiotics in Wastewater Using Advanced Oxidation Processes (AOPs)

Kurt¹,

Mert²,

Özengi̇n³

et al. 2017

Physico-Chemical Wastewater Treatment and Resource Recovery

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Antibiotics are nonbiodegradable, can survive at aquatic environments for long periods and they have a big potential bio-accumulation in the environment. They are extensively metabolized by humans, animals and plants. After metabolization, antibiotics or their metabolites are excreted into the aquatic environment. Removal of these compounds from the aquatic environment is feasible by different processes. But antibiotics are not treated in conventional wastewater treatment plants efficiently. During the last years studies with advanced oxidation processes (AOPs) for removal of these pharmaceuticals from waters has shown that they can be useful for removing them fully. Advanced oxidation processes (AOPs) can work as alternatives or complementary method in traditional wastewater treatment, and highly reactive free radicals, especially hydroxyl radicals (OH) generated via chemical (O 3 /H 2 O 2 ,O 3 /OH -), photochemical (UV/O 3 ,O 3 /H 2 O 2 ) reactions, serve as the main oxidant. This study presents an overview of the literature on antibiotics and their removal from water by advanced oxidation processes. It includes almost all types of antibiotics which are consumed by human and veterinary processes. It was found that most of the investigated advanced oxidation treatment processes for the oxidation of antibiotics in water are direct and indirect photolysis with the combinations of H 2 O 2 ,TiO 2 , ozone and Fenton's reagent.

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Section: Ozonationmentioning

confidence: 99%

“…This method is considered to be the most effective and powerful method, which provides a fast and complete mineralization of pollutants [42,50]. The addition of H 2 O 2 to the O 3 /UV process accelerates the decomposition of ozone, which results in an increased rate of ·OH generation.…”

Section: Ozone/uv (O 3 /Uv) Processmentioning

confidence: 99%

Treatment of Antibiotics in Wastewater Using Advanced Oxidation Processes (AOPs)

Kurt¹,

Mert²,

Özengi̇n³

et al. 2017

Physico-Chemical Wastewater Treatment and Resource Recovery

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“…Buehler et al, 1984;Gonzalez et aI., 1997;Ko et aI., 2000;Magi et aI., 1997;Mokrini et al, 1997;Munoz etal., 2000Munoz etal., , 2001Spanggord et al, 2000;Staehlin and Hoigne, 1982;Staehlin et al, 1984;Weavers et al, 1998). The complexity of aqueous phase ozonation is revealed by decomposition rate laws that vary between '/2, 1st and 2nd order in ozone depending on the initiation rate and water purity (Staehlin and Hoigne, 1985).…”

Section: Ozonementioning

confidence: 99%

“…These results, presented together with the 2,5-DHBA yield following reaction with OH are shown in Figure 7. Mokrini et al (1997) proposed that in neutral and basic solution, benzoic acid is oxidised by ozone via a free-radical pathway but in acidic solution direct attack by molecular ozone predominates. A sampling pH of 4.6 was chosen for further studies since this reduces the interference due to ozone while maintaining a high 2,5-DHBA yield following reaction with OH.…”

Section: Ozonementioning

confidence: 99%

Evaluation of the Salicylic Acid–Liquid Phase Scrubbing Technique to Monitor Atmospheric Hydroxyl Radicals

Salmon

Schiller

Harris

2004

Journal of Atmospheric Chemistry

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Abstract. A novel method has been examined for monitoring tropospheric hydroxyl radicals (OH), the most important oxidant in tropospheric chemistry. Aqueous phase salicylic acid reacts with atmospheric OH to produce 2,5-dihydroxy benzoic acid (2,5-DHBA) and other products. High Performance Liquid Chromatography (HPLC) is used to separate the post-reaction solution and the products are quantified using fluorescence detection. Unlike other methods, it has been reported to be inexpensive, portable and relatively simple. Although the sensitivity was sufficient to measure typical daytime OH concentrations of 0.04--0.4 ppt., the method was hindered by numerous interferences. Successive identification and elimination of these still resulted in a signal that was much larger than expected. Tests showed that this was not likely to be due to ozone, H0 2 , NOx, H 2 0 2 , aerosols, light or bacteria. Experimental and numerical studies suggest that the interference could be due to methyl peroxy radicals. The effect of many other components in the atmosphere, both individual and combined, must also be tested before the method can be used reliably in the field. The validity of previous reports of ambient hydroxyl measurements using this technique is therefore brought into question.

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“…In this process, hydroxyl radicals generated from the direct photolysis of hydrogen peroxide were the main responsible species of phenol elimination. However hydrogen peroxide also reacts with these radicals and hence acts as an inhibiting agent of phenol degradation [11]. As can be deduced from Fig.…”

Section: The Effect Of the Amount Of H 2 Omentioning

confidence: 93%

Efficiency comparison of advanced photochemical oxidation technologies in phenol removal from aqueous solution in Iran

Torabian

Jamshidi²,

Azimi

et al. 2009

WIT Transactions on Ecology and the Environment

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In this study, advanced oxidation processes (UV, UV/H 2 O 2 , UV/H 2 O 2 /Fe(II) and UV/H 2 O 2 /Fe(III)) were investigated in lab-scale experiments for degradation of phenol or benzene hydroxy in aqueous solution. The study showed that the photo-Fenton process, (a mixture of hydrogen peroxide and ferrous or ferric ion), was the most effective treatment process under acidic conditions and produced a higher rate of degradation of phenol at a very short radiation time. It accelerated the oxidation rate by 4-5 times the rate for the UV/H 2 O 2 process. The reaction was influenced by the pH, the input concentration of H 2 O 2 and the amount of the iron catalyst and the type of iron salt. The experimental results showed that the optimum conditions were obtained at a pH value of 3, with 6 mmol/1 H 2 O 2 , and 0.5 mmol/1 Fe(II) for the UV/H 2 O 2 /Fe(II) system and 6 mmol/l H 2 O 2 and, 0.4 mmol/1 Fe(III) for the UV/H 2 O 2 /Fe(III) system. As for the UV processes, UV/H 2 O 2 /Fe(III) showed the highest degradation rate.

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Oxidation of aromatic compounds with UV radiation/ozone/hydrogen peroxide

Cited by 76 publications

References 0 publications

Treatment of Antibiotics in Wastewater Using Advanced Oxidation Processes (AOPs)

Treatment of Antibiotics in Wastewater Using Advanced Oxidation Processes (AOPs)

Evaluation of the Salicylic Acid–Liquid Phase Scrubbing Technique to Monitor Atmospheric Hydroxyl Radicals

Efficiency comparison of advanced photochemical oxidation technologies in phenol removal from aqueous solution in Iran

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