Decolorization of C.I. reactive red 198 in UV/oxidant and UV/TiO2/oxidant systems

Wu, Ming-Ching; Wu, Chung‐Hsin

doi:10.1007/s11144-011-0346-8

Cited by 13 publications

(2 citation statements)

References 25 publications

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“…However, hypochlorite (ClO − ) can be used as an efficient electron acceptor to prevent the e − /h + recombination, as shown in Equation (43), and increase the concentration of radicals in the bulk solution. Similar effects have been observed with other oxidants, such as H 2 O 2 and persulfate [39][40][41][42][43][44]. In addition, Reaction 44 can replace inactive • OH ad with ClO • , which is likely to diffuse widely in the bulk solution to react with RhB molecules and enhance their degradation.…”

Section: Effect Of Tio2 Nanocatalystsupporting

confidence: 56%

Solar Chlorine Activation for Efficient Rhodamine B Removal in Strong Basic pH: Processing Conditions, Radicals Probing, and TiO2 Nanocatalyst Effect

Bouchoucha,

Bekkouche,

Merouani

et al. 2023

Catalysts

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In recent years, there has been growing interest in the application of UV/chlorine advanced oxidation processes for wastewater treatment. However, few studies have investigated this process in a strongly basic medium (pH > 10), which is a common characteristic of many industrial effluents. In addition, the use of artificial UV lamps in these processes can be costly. To address these challenges, we investigated the use of solar light (referred to as Solar-L) in the Solar-L/chlorine process for the degradation of Rhodamine B (RhB) in a strongly basic medium (pH 11). We found that separate solar light or chlorination showed no degradation after half an hour, but the Solar-L/chlorine process effectively degraded RhB, with complete removal achieved in only 30 min, using 1000 µM ClO−. The process also resulted in a significant reduction of TOC, i.e., 60% after 120 min and 80% after 240 min. Our results indicate that both •OH/O•− and reactive chlorine species (RCS) were involved in the degradation process, while O3 played no role. The process performance improved with the decreasing initial contaminant concentration and increasing temperature (up to 55 °C). The addition of a TiO2 nanocatalyst to the Solar-L/chlorine system significantly improved the RhB degradation efficiency by more than 30%. It was found that neither adsorption (on TiO2) nor Solar-L/TiO2 photolysis contributed to the dye removal by the Solar-L/chlorine/TiO2 system. Instead, the improvement associated with the Solar-L/chlorine/TiO2 system was related to the involvement of hypochlorite in the photocatalytic reaction at the catalyst surface. A detailed discussion of the effect of TiO2 was carried out based on the physicochemical properties of RhB and TiO2 catalyst with respect to the solution’s pH. In conclusion, this study highlights the potential of solar light as a sustainable and efficient technology for the treatment of polluted water in strong basic media in the presence of chlorine and chlorine/TiO2 as additives. These valuable findings provide a basis for the future research and development of this promising technology for water treatment applications.

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Section: Effect Of Tio2 Nanocatalystsupporting

confidence: 56%

Solar Chlorine Activation for Efficient Rhodamine B Removal in Strong Basic pH: Processing Conditions, Radicals Probing, and TiO2 Nanocatalyst Effect

Bouchoucha,

Bekkouche,

Merouani

et al. 2023

Catalysts

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“…Although the photochemistry of the periodate ion in the aqueous stage has been extensively examined and relatively well elucidated in several previous studies [13][14][15][16][17], some reports on the application of photoactivated periodate to water treatment are remained. Additionally, although the degradation of dyes by photocativated periodate have been examined [18][19][20][21][22][23], comprehensive studies on the effects of process variables are yet to be carried out.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Degradation of anthraquinonic dye in water by photoactivated periodate

Ghodbane

Hamdaoui

2016

Desalination and Water Treatment

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In this work, the degradation of Acid blue 25 (AB25), an anthraquinonic dye and a widely used colorant in many industries, by photoactivated periodate (UV/IO À 4 ) process was investigated. Experiments were conducted in batch mode using a low-pressure mercury lamp emitting mainly at 253.7 nm. The effects of the operational conditions such as periodate ions concentration, initial dye concentration, initial pH of the solution, and tert-butanol addition on the degradation of AB25 were examined. The results have shown that the degradation rate was increased in the presence of UV/IO À 4 compared to UV irradiation alone. The degradation rate increased with the increase in periodate concentration to 1 mM and decreased slightly at higher values (>1 mM). The degradation of AB25 decreased when the dye concentration increased. The extent of degradation was found to be inversely proportional to the initial concentration of dye. AB25 degradation was significantly affected by varying the initial solution pH. The fastest degradation was obtained at natural pH (6.4). The degradation of the dye was not appreciably affected by the addition of tert-butanol, known as an effective scavenger of Å OH radicals, even at high concentration. Thus, the degradation of AB25 by photoactivated periodate technique was not dominated by an Å OH pathway.

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UV/Periodate Advanced Oxidation Process: Fundamentals and Applications

Merouani¹,

Hamdaoui

2021

Applied Water Science

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Decolorization of C.I. reactive red 198 in UV/oxidant and UV/TiO2/oxidant systems

Cited by 13 publications

References 25 publications

Solar Chlorine Activation for Efficient Rhodamine B Removal in Strong Basic pH: Processing Conditions, Radicals Probing, and TiO2 Nanocatalyst Effect

Solar Chlorine Activation for Efficient Rhodamine B Removal in Strong Basic pH: Processing Conditions, Radicals Probing, and TiO2 Nanocatalyst Effect

Degradation of anthraquinonic dye in water by photoactivated periodate

UV/Periodate Advanced Oxidation Process: Fundamentals and Applications

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