Efficient removal of cadmium and 2-chlorophenol in aqueous systems by natural clay: Adsorption and photo-Fenton degradation processes

Hadjltaief, Haithem Bel; Sdiri, Ali; Ltaief, Wahida; Costa, Patrick Da; Gálvez, María Elena; Zina, Mourad Ben

doi:10.1016/j.crci.2017.01.009

Cited by 50 publications

(25 citation statements)

References 39 publications

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“…Oxidation potential is an oxidation power which come from oxidation reduction reaction, and it is represented in volt to normalize hydrogen electrode. Besides, hydrogen peroxide (H2O2) is a chemical oxidizing agent with the oxidation potential of 1.77 V which greater than permanganate (1.67 V) and chlorine (1.36 V) [7]. Thus, the oxidation power of hydrogen peroxide can break down organic compounds to simple compounds.…”

Section: Methodsmentioning

confidence: 99%

Organic pollutant degradation of tapioca flour industrial waste with photo-fenton reaction

2018

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Abstract. Cassava (Manihot utilissima) is the main raw material of tapioca flour industry. The tapioca industry waste water still contains high enough BOD, COD, and cyanide, above the quality standard of industrial waste water. Photo-Fenton is one of the most effective alternative methods of degrading organic pollutants. This study aims to determine the effect of Photo-Fenton method on the degradation of organic pollutants such as COD and cyanide. For operating conditions of this study use the addition of concentrations of H 2 O 2 and FeSO 4 .7H 2 O and different UV light intensity. The analysis of COD concentration using SNI method is spectrophotometric. From the research result, it is found that the concentration of COD and cyanide in tapioca waste can be reduced by using Photo-Fenton method. With initial COD content of 6000 mg/L and cyanide level of 0.67 mg/L. And in the operating conditions of the addition of 5 ml/l of H 2 O 2 , Fe 2+ 1.25 mg/l, and light intensity of 200 lm, the highest COD and cyanide levels were found to be 900 mg/l for COD and 0.08 mg/l for cyanide. Final levels of COD up to 900 mg/l and cyanide concentrations up to 0.08 mg/l.

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Section: Methodsmentioning

confidence: 99%

Organic pollutant degradation of tapioca flour industrial waste with photo-fenton reaction

2018

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“…Thus, it is very crucial to treat these phenolic contaminated wastewater before releasing into the receiving environment. Several methods have been reported in the degradation of phenolic pollutants from contaminated wastewater, for instance; adsorption, volatilization, advanced oxidation, photo-catalytic degradation electrochemical methods [8,9,10,11,12]. However, in complete removal, generation of toxic intermediate products, high cost and low efficiency are the major drawback of these conventional techniques.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of simultaneous degradation of 4-bromophenol and 4-chlorophenol by Arthrobacter chlorophenolicusA6

2020

Biointerface Res Appl Chem

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Biodegradation of p-bromophenol (4-BP) along with p-chlorophenol (4-CP) was investigated in batch shake flasks using a actinomycetes strain of Arthrobacterchlorophenolicus A6. A Two level full factorial design at two different levels (low and high) was applied to perform the biodegradation of 4-CP and 4-BP in the mixed substrate system. Result reveals that the presence of 4-CP in low concentration range in the mixture (20-60 mgl -1 ) did not inhibit 4-BP biodegradation by the actinomycetes. However, at high concentration range of 4-CP (100-200 mgl -1 ), the 4-BP biodegradation was inhibited. Further, 4-BP degradation was faster than 4-CP. In order to study variation in the specific degradation rate of these pollutants and their interaction effect exist between them, the experimental data were fitted to a sum kinetics model. The experimental data have been fitted with the model with a high correlation coefficient value (R 2 > 0.94). The model fitted data reveals a strong negative interaction effect of 4-CP on biodegradation of 4-BP by the A. chlorophenolicusA6.

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“…It is well known that complete oxidation (i.e., mineralization) of 4-CP occurred through several intermediate reactions, such as hydroxybenzoquinone (yellow), o-benzoquinone (red), and hydroquinone (colorless) and/or maleic and other carboxylic acids, some of them being even more toxic than 4-CP itself [30]. Bel Hadjltaief et al [10,11] observed yellow color during the degradation of phenol and 2-Chlorophenol using raw and modified clay as catalysts by photo-Fenton process. Brownish color can be assigned to the presence of hydroxybenzoquinone, considered an intermediate in the 4-CP oxidation process.…”

Section: Catalytic Performance In the Photo-fenton Oxidation Of 4-chlmentioning

confidence: 99%

“…A detailed description of catalytic reactor was reported by Bel Hadjltaief et al [10,21]. Irradiation was carried out using 2 parallel UV lamps at 254 and 365 nm at 930/13 μW/cm 2 .…”

Section: Photo-fenton Experiments and Analytical Proceduresmentioning

confidence: 99%

“…To achieve this goal, various methods have been developed, including adsorption [5], biological degradation [6], electrochemical oxidation [2], wet oxidation [4], photocatalytic degradation [1] and photo-Fenton oxidation [7][8][9]. A homogeneous Fenton or photo-Fenton reaction is considered one of the most promising ways to remove highly hazardous phenolic species, because it is not influenced by their toxicity [10,11]. Fenton oxidation is however not efficient enough at neutral pH.…”

Section: Introductionmentioning

confidence: 99%

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Natural Hematite and Siderite as Heterogeneous Catalysts for an Effective Degradation of 4-Chlorophenol via Photo-Fenton Process

et al. 2018

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This paper describes a simple and low-cost process for the degradation of 4-Chlorophenol (4-CP) from aqueous solution, using natural Tunisian Hematite (M 1 ) and Siderite (M 2 ). Two natural samples were collected in the outcroppings of the Djerissa mining site (Kef district, northwestern Tunisia). Both Hematite and Siderite ferrous samples were characterized using several techniques, including X-Ray Diffraction (XRD), Nitrogen Physisorption (BET), Infrared Spectroscopy (FTIR), H 2 -Temperature Programmed Reduction (H 2 -TPR), Scanning Electronic Microscopy (SEM) linked with Energy Dispersive X-ray (EDS) and High-Resolution Transmission Electron Microscopy (HRTEM). Textural, structural and chemical characterization confirmed the presence of Hematite and Siderite phases with a high amount of iron on the both surface materials. Their activity was evaluated in the oxidation of 4-CP in aqueous medium under heterogeneous photo-Fenton process. Siderite exhibited higher photocatalytic oxidation activity than Hematite at pH 3. The experimental results also showed that 100% conversion of 4-CP and 54% TOC removal can be achieved using Siderite as catalyst. Negligible metal leaching and catalyst reutilization without any loss of activity point towards an excellent catalytic stability for both natural catalysts.

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Efficient removal of cadmium and 2-chlorophenol in aqueous systems by natural clay: Adsorption and photo-Fenton degradation processes

Cited by 50 publications

References 39 publications

Organic pollutant degradation of tapioca flour industrial waste with photo-fenton reaction

Organic pollutant degradation of tapioca flour industrial waste with photo-fenton reaction

Kinetics of simultaneous degradation of 4-bromophenol and 4-chlorophenol by Arthrobacter chlorophenolicusA6

Natural Hematite and Siderite as Heterogeneous Catalysts for an Effective Degradation of 4-Chlorophenol via Photo-Fenton Process

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