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Morjène L, Tasbihi M, Schwarze M, Schomäcker R, Aloulou F, Seffen M. A composite of clay, cement, and wood as natural support material for the immobilization of commercial titania (P25, P90, PC500, C-TiO 2) towards photocatalytic phenol degradation. Water Sci Technol 2020; 81:1882-1893. [PMID: 32666943 DOI: 10.2166/wst.2020.244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Different types of commercial titania (P25, P90, PC500, and C-TiO2) were immobilized as single or mixed photocatalyst onto the surface of a natural support material made of cement, clay, and wood fibers. The successful immobilization was studied by different techniques showing a composite material with the mechanical properties of the support material and the photocatalytic behavior of the immobilized titania. The supported photocatalyst showed high mechanical stability and was applied to the photocatalytic degradation of phenol as a model pollutant under UV light irradiation. As the most active photocatalytic material, a mixture PC500 and P90 (comp-PC500/P90) was identified with an apparent pseudo first-order kinetic rate constant (kapp) of 0.010 min-1 at a degradation efficiency of 100%. The catalyst was used several times and showed minor loss in activity during four runs due to degradation intermediates adsorbed to the surface, shown by a color change from white to yellow.
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Affiliation(s)
- L Morjène
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany E-mail: ; Laboratory of Energy and Materials, High School of Sciences and Technology of Hammam Sousse, University of Sousse, Rue Lamine Abassi 4011, Hammam Sousse, Tunisia
| | - M Tasbihi
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany E-mail:
| | - M Schwarze
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany E-mail:
| | - R Schomäcker
- Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany E-mail:
| | - F Aloulou
- Laboratory of Energy and Materials, High School of Sciences and Technology of Hammam Sousse, University of Sousse, Rue Lamine Abassi 4011, Hammam Sousse, Tunisia
| | - M Seffen
- Laboratory of Energy and Materials, High School of Sciences and Technology of Hammam Sousse, University of Sousse, Rue Lamine Abassi 4011, Hammam Sousse, Tunisia
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Harrabi M, Alexandrino DAM, Aloulou F, Elleuch B, Liu B, Jia Z, Almeida CMR, Mucha AP, Carvalho MF. Biodegradation of oxytetracycline and enrofloxacin by autochthonous microbial communities from estuarine sediments. Sci Total Environ 2019; 648:962-972. [PMID: 30144764 DOI: 10.1016/j.scitotenv.2018.08.193] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 08/14/2018] [Accepted: 08/15/2018] [Indexed: 05/22/2023]
Abstract
This work investigated the potential of microbial communities native to an estuarine environment to biodegrade enrofloxacin (ENR) and oxytetracycline (OXY). Sediments collected from two sites in the Douro river estuary (Porto, Portugal) were used as inocula for the biodegradation experiments. Experiments were carried out for one month, during which ENR and OXY (1 mg L-1) were supplemented individually or in mixture to the cultures at 10-day intervals. Acetate (400 mg L-1) was added to the cultures every 3 days to support microbial growth. A series of experimental controls were established in parallel to determine the influence of abiotic breakdown and adsorption in the removal of the antibiotics. Removal of antibiotics was followed by measuring their concentration in the culture medium. Additionally, next-generation sequencing of the 16S rRNA gene amplicon was employed to understand how microbial communities responded to the presence of the antibiotics. At the end of the biodegradation experiments, microbial cultures derived from the two estuarine sediments were able to remove up to 98% of ENR and over 95% of OXY. The mixture of antibiotics did not affect their removal. ENR was removed mainly by biodegradation, while abiotic mechanisms were found to have a higher influence in the removal of OXY. Both antibiotics adsorbed at different extents to the estuarine sediments used as inocula but exhibited a higher affinity to the sediment with finer texture and higher organic matter content. The presence of ENR and OXY in the culture media influenced the dynamics of the microbial communities, resulting in a lower microbial diversity and richness and in the predominance of bacterial species belonging to the phylum Proteobacteria. Therefore, microbial communities native from estuarine environments have potential to respond to the contamination caused by antibiotics and may be considered for the recovering of impacted environments through bioremediation.
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Affiliation(s)
- Malek Harrabi
- National School of Engineer of Sfax, Soukra Km 3.5 B.P. 1173-3038 Sfax,Tunisia
| | - Diogo A M Alexandrino
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208 Matosinhos, Portugal; Institute of Biomedical Sciences Abel Salazar, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal
| | - Fatma Aloulou
- National School of Engineer of Sfax, Soukra Km 3.5 B.P. 1173-3038 Sfax,Tunisia
| | - Boubaker Elleuch
- National School of Engineer of Sfax, Soukra Km 3.5 B.P. 1173-3038 Sfax,Tunisia
| | - Bei Liu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu Province, China
| | - Zhongjun Jia
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu Province, China
| | - C Marisa R Almeida
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208 Matosinhos, Portugal
| | - Ana P Mucha
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208 Matosinhos, Portugal
| | - Maria F Carvalho
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
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Harrabi M, Belhadj Ammar H, Mbarki K, Naifar I, Yaiche C, Aloulou F, Elleuch B. Ultrasonic power improvement of flumequine degradation effectiveness in aqueous solution via direct and indirect action of mechanical acoustic wave. Ultrason Sonochem 2018; 48:517-522. [PMID: 30080580 DOI: 10.1016/j.ultsonch.2018.06.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/04/2018] [Accepted: 06/11/2018] [Indexed: 06/08/2023]
Abstract
The current research work aimed to describe the roles of ultrasonic power under sono-Fenton process in the degradation of flumequine (FLU) in water. For this purpose, the effects of some parameters including temperature, ferrous ion concentration, chemical oxidant concentration (S2O82- and Cl-) and the initial pH value of the reaction kinetics were investigated. Results showed that the degradation of FLU antibiotic was accelerated by ultrasonic irradiation and the presence of an inorganic oxidant. The sono-generation of active species such as hydroxyl radicals (HO and HOO) and sulfate radicals (SO4-) as strong oxidizing agents improved the FLU degradation. In fact, the peroxydisulfate anion (S2O82-) has been identified as among parameters that enhanced the degradation process. Under optimal conditions, 98% of the flumequine removal was carried out within 80 min at 60 °C.
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Affiliation(s)
| | - Hafedh Belhadj Ammar
- Department of Chemistry, Faculty of Sciences of Sfax, University of Sfax, Tunisia.
| | | | - Ikram Naifar
- National School of Engineering Sfax, GEET, Tunisia
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Ayadi N, Zghal I, Aloulou F, Bouzid J. Impacts of several pollutants on the distribution of recent benthic foraminifera: the southern coast of Gulf of Gabes, Tunisia. Environ Sci Pollut Res Int 2016; 23:6414-6429. [PMID: 26620866 DOI: 10.1007/s11356-015-5872-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 11/23/2015] [Indexed: 06/05/2023]
Abstract
In addition to physicochemical methods, benthic foraminifera have become an essential tool for the assessment of polluted environments. The main objectives of the present work were to study the distribution of benthic foraminifera along the coastline of Skhira and Gabes (southern coast of Gulf of Gabes) and to predict the impact of pollution on these organisms. Thirty-one samples were studied and a polluted area was delimited by chemical analysis, where heavy metal, fluoride, phosphorus, nitrogen, and COT contents are very high. Thirty-four species of benthic foraminifera were identified and their response to pollution is very remarkable, in which their distribution shows barren area, corresponding to the highly polluted area. Away from the contaminated area, the density and the diversity of these organisms increase. Statistical analyses (principal component analysis (PCA)/FA and matrix correlation) show a possible control of these pollutants on biotic indices (with negative correlation), in addition to the presence of tolerant and sensitive species to pollution. A variety of test malformations were noticed especially in Ammonia beccarii, Peneroplis planatus, Sorites variabilis, and Adelosina pulchella. Unpolluted stations were dominated by species characteristic of shallow water environments with sandy sediment such Ammonia parkinsoniana, Triloculina trigonula, Quinqueloculina agglutinans, and P. planatus.
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Affiliation(s)
- N Ayadi
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia.
| | - I Zghal
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia
| | - F Aloulou
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia
| | - J Bouzid
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia
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Aloulou F, EllEuch B, Kallel M. Benthic foraminiferal assemblages as pollution proxies in the northern coast of Gabes Gulf, Tunisia. Environ Monit Assess 2012; 184:777-795. [PMID: 21476104 DOI: 10.1007/s10661-011-2001-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Accepted: 03/14/2011] [Indexed: 05/30/2023]
Abstract
A study of chemical and sedimentological parameters integrated with benthic foraminifera investigation was conducted along the northern coast of Gabes Gulf. Thirty-two samples were studied and a total of 68 benthic foraminiferal species were identified. Heavy metals enrichment factors and total hydrocarbon concentrations showed both metal and petrogenic pollution related mainly to phosphogypsum, sewage, and fishing activities. Statistical analysis (bivariate correlation and hierarchical cluster analysis) show a possible control of these pollutants on density, diversity, as well as the taxonomic composition of the benthic foraminiferal assemblages. The extent to which the population was found less dense and less diversified corresponded to the degree to which the sediment was contaminated. In these contaminated sites, an increase in relative abundance of opportunistic species such Ammonia tepida and Haynesina germanica was found. Far from pollution, foraminiferal assemblages are dominated by species characteristic of Mediterranean shallow water (Ammonia beccarii, Ammonia parkinsoniana, Elphidium crispum, Elphidium williamsoni, Elphidium advenum, Peneroplis planatus, Peneroplis pertesus).
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Affiliation(s)
- Fatma Aloulou
- Laboratoire de recherche: Eau-Energie-Environnement, Ecole Nationale d'Ingénieurs de Sfax, Tunisie ENIS, BP 1173, 3038 Sfax, Tunisia.
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Alila S, Aloulou F, Beneventi D, Boufi S. Self-aggregation of cationic surfactants onto oxidized cellulose fibers and coadsorption of organic compounds. Langmuir 2007; 23:3723-31. [PMID: 17335256 DOI: 10.1021/la063118n] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
In this work, the adsorption of cationic surfactant and organic solutes on oxidized cellulose fibers bearing different amounts of carboxylic moieties was investigated. The increase in the amount of -COOH groups on cellulose fibers by TEMPO oxidation induced a general rise in surfactant adsorption. For all tested conditions, that is, cellulose oxidation level and surfactant alkyl chain length (C12 and C16), adsorption isotherms displayed a typical three-region shape with inversion of the substrate zeta-potential which was interpreted as reflecting surfactant adsorption and aggregation (admicelles and hemimicelles) on cellulose fibers. The addition of organic solutes in surfactant/cellulose systems induced a decrease in surfactant cac on the cellulose surface thus favoring surfactant aggregation and the formation of mixed surfactant/solute assemblies. Adsorption isotherms of organic solutes on cellulose in surfactant/cellulose/solute systems showed that solute adsorption is strictly correlated to (i) the surfactant concentration, solute adsorption increases up to the surfactant cmc, where solute partitioning between the cellulose surface and free micelles causes a drop in adsorption, and to (ii) solute solubility and functional groups. The specific shape of solutes adsorption isotherms at a fixed surfactant concentration was interpreted using a Frumkin adsorption isotherm, thus suggesting that solute uptake on cellulose fibers is a coadsorption and not a partitioning process. Results presented in this study were compared with those obtained in a previous work investigating solute adsorption in anionic surfactant/cationized cellulose systems to better understand the role of surfactant/solute interactions in the coadsorption process.
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Affiliation(s)
- S Alila
- LMSE, Faculté des Sciences de Sfax, BP 802-3018 Sfax-Tunisie, and LGP2-UMR5518, Ecole Française de Papeterie et des Industries Graphiques (INPG), BP 65, F-38402 St. Martin d'Héres, France
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Aloulou F, Boufi S, Beneventi D. Adsorption of organic compounds onto polyelectrolyte immobilized-surfactant aggregates on cellulosic fibers. J Colloid Interface Sci 2004; 280:350-8. [PMID: 15533407 DOI: 10.1016/j.jcis.2004.08.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2004] [Accepted: 08/03/2004] [Indexed: 10/26/2022]
Abstract
The adsorption of anionic surfactants with different hydrophobic chain lengths onto cellulose fibers pretreated with a cationic polyelectrolyte has been investigated. Five steps are involved in the adsorption process, which was ascribed to the formation of monolayer and bilayer surfactant aggregates. Electrostatic interaction between the residual surface charges followed by hydrophobic interaction among the alkyl chains are considered the main factors in the adsorption process. The adsorption of the anionic surfactant was found to greatly enhance the retention of organic compounds onto the polyelectrolyte-treated cellulose. The coadsorption phenomenon, which was dependent on the saturation level of the adsorbed surfactant, has been explained in terms of the accumulation of the organic solute on the hydrophobic core generated by the adsorbed layer.
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Affiliation(s)
- F Aloulou
- LMSE, Faculté des Sciences de Sfax, B.P. 802-3018 Sfax, Tunisia
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