Oxidative Degradation of 4-Chlorophenol From Aqueous Solution by Photo-Fenton Advanced Oxidation Process

Untea, Ion; Orbeci, Cristina; Tudorache, Elena

doi:10.30638/eemj.2006.053

Cited by 7 publications

(4 citation statements)

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“…Although biodegradation may prove to be efficient, requirements for specific environmental conditions (methanogenic or sulphate reducing) particularly in case of anaerobic degradation, and long acclimation and hydraulic retention times in general, can strongly restrict its field of application. The use of advanced oxidation processes such as wet air oxidation, Fenton, or photochemical processes has been studied extensively in the last years, showing good results but also some drawbacks or limitations such as the need of relatively high temperatures and/or pressures, large amounts of reagents and/or complex equipment [8][9][10]. The catalytic hydrogenation of the carbon-chlorine bond -hydrodechlorination -is an emerging technique for the degradation of halogenated organics in wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Hydrodechlorination of 4-chlorophenol in water with formic acid using a Pd/activated carbon catalyst

Calvo

Gilarranz

Casas

et al. 2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Hydrodechlorination of 4-chlorophenol in water with formic acid using a Pd/activated carbon catalyst

Calvo

Gilarranz

Casas

et al. 2009

Journal of Hazardous Materials

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“…The more chlorine atoms grafted onto the aromatic ring, the more chloride ions generated during photocatalytic degradation. It is known that chloride ions decrease photocatalytic activity because they can interact with holes (h + vb ) and hydroxyl radicals (HO•) forming their own radicals (Cl•, Cl 2 − •, and HOCl − •) which are less reactive [26]. Therefore, these types of interaction (Equations (1)-(7)) lead to a decrease in the number of reactive species such as hydroxyl radicals (HO•) and superoxide radicals (O 2 − •) which are effectively involved in the degradation of the organic material [27,28].…”

Section: Photocatalytic Oxidationmentioning

confidence: 99%

Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

Bobiricǎ

Orbeci

2020

Catalysts

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Given the known adverse effect of chlorophenols for the aquatic environments which they can reach, the development of efficient methods both technically and economically to remove them has gained increasing attention over time. The combination of photocatalytic oxidation with biological treatment can lead to high removal efficiencies of chlorophenols, while reducing the costs associated with the need to treat large volumes of aqueous solutions. Therefore, the present paper had as its main objective the identification of the minimum photocatalytic oxidation period during which the aqueous solutions of 4-chlorophenol and 2,4-dichlorophenol can be considered as readily biodegradable. Thus, the results of photocatalytic oxidation and biodegradability tests showed that, regardless of the concentration of chlorophenol and its type, the working solutions become readily biodegradable after up to 120 min of irradiation in ultraviolet light. At this irradiation time, the maximum organic content of the aqueous solution is less than 40%, and the biochemical oxygen demand and chemical oxygen demand (BOD/COD) ratio is much higher than 0.4. The maximum specific heterotrophic growth rate of activated sludge has an average value of 4.221 d−1 for 4-chlorophenol, and 3.126 d−1 for 2,4-dichlorophenol. This irradiation period represents at most half of the total irradiation period necessary for the complete mineralization of the working solutions. The results obtained were correlated with the intermediates identified during the photocatalytic oxidation. It seems that, working solutions initially containing 4-chlorophenol can more easily form readily biodegradable intermediates.

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“…Chlorophenols (CPs), existing widely in polluted groundwater and the wastewater effluents of industry [1,2], have been listed as priority pollutants in many countries because of their high toxicity, adverse environmental impacts and poor biodegradability [3][4][5]. For the safe disposal of these highly toxic chlorinated organic pollutants, many detoxification techniques such as biodegradation [6], photochemical degradation [5], advanced oxidation [7,8] and catalytic hydrodechlorination [9,10] have been proposed. Among the available water treatment techniques mentioned above, hydrodechlorination (HDC) presents the advantages of greater flexibility, low energy consumption and relatively safe by-products, showing promising prospects in the treatment of wastewater containing chlorinated organic pollutants [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrodechlorination of Chlorophenols in a Continuous Flow Pd/CNT-Ni Foam Micro Reactor Using Formic Acid as a Hydrogen Source

Xiong

2019

Catalysts

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Catalytic hydrodechlorination (HDC) has been considered as a promising method for the treatment of wastewater containing chlorinated organic pollutants. A continuous flow Pd/carbon nanotube (CNT)-Ni foam micro reactor system was first developed for the rapid and highly efficient HDC with formic acid (FA) as a hydrogen source. This micro reactor system, exhibiting a higher catalytic activity of HDC than the conventional packed bed reactor, reduced the residence time and formic acid consumption significantly. The desired outcomes (dichlorination >99.9%, 4-chlorophenol outlet concentration <0.1 mg/L) can be obtained under a very low FA/substrate molar ratio (5:1) and short reaction cycle (3 min). Field emission scanning electron microcopy (FESEM) and deactivation experiment results indicated that the accumulation of phenol (the main product during the HDC of chlorophenols) on the Pd catalyst surface can be the main factor for the long-term deactivation of the Pd/CNT-Ni foam micro reactor. The catalytic activity deactivation of the micro reactor could be almost completely regenerated by the efficient removal of the absorbed phenol from the Pd catalyst surface.

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Oxidative Degradation of 4-Chlorophenol From Aqueous Solution by Photo-Fenton Advanced Oxidation Process

Cited by 7 publications

References 0 publications

Hydrodechlorination of 4-chlorophenol in water with formic acid using a Pd/activated carbon catalyst

Hydrodechlorination of 4-chlorophenol in water with formic acid using a Pd/activated carbon catalyst

Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

Catalytic Hydrodechlorination of Chlorophenols in a Continuous Flow Pd/CNT-Ni Foam Micro Reactor Using Formic Acid as a Hydrogen Source

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