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2007_6_Nr6_EEMJ

Obtaining and

Obtaining and characterization of Romanian zeolite supporting silver ions Corina Orha, Florica Manea, Cornelia Ratiu, Georgeta Burtica, Aurel Iovi………….…………… 541 Using GPS technology and distributed measurement system for air quality maping of rezidential area Alexandru Trandabăţ, Marius Branzila, Codrin Donciu, Marius Pîslaru, Romeo Cristian Ciobanu…………………………………………………………………………… 545 Synthesis, characterization and catalytic reduction of NO x emissions over LaMNO 3 perovskite Liliana-Mihaela Chirilă, Helmut Papp, Wladimir Suprun, Ion Balasanian………………………….. 549 Kinetics of carbon dioxide absorption into aqueous solutions of 1, 5, 8, 12- tetraazadodecane (apeda) Ilie Siminiceanu, Ramona-Elena Tataru-Farmus, Chakib Bouallou………………………………… 555 Urban traffic pollution reduction using an intelligent video semaphoring system Codrin Donciu, Marinel Temneanu, Marius Brînzilă…………………………………………………. 563 Study of increasing soil fertility into a site with high electric field around using polymeric conditioning agent Ioan Ivanov Dospinescu , Carmen Zaharia, Matei Macoveanu………………………………………... 567 Methods and procedures for environmental risk assessment Brînduşa Mihaela Robu, Florentina Anca Căliman, Camelia Beţianu, Maria Gavrilescu……………………………………………………………………................................... 573 Comparative study of some essential elements in different types of vegetables and fruits Alina Soceanu, Simona Dobrinas, Viorica Popescu, Semaghiul Birghila, Vasile Magearu ................................................................................................................................ 593 Chemical reactor design and control Book review……………………………………………………………………………………………………. 597 Modeling of process intensification Book review……………………………………………………………………………………………………. 601 Ullmann’s - Modeling and simulation Book review………………………………………………………………………………………… 603 Micro Instrumentation - For high throughput experimentation and process intensification – a tool for PAT Book review……………………………………………………………………………………………………. 605

Environmental Engineering and Management Journal November/December 2007, Vol.6, No.6, 479-482 http://omicron.ch.tuiasi.ro/EEMJ/ “Gh. Asachi” Technical University of Iasi, Romania ______________________________________________________________________________________________ PHENOL DEGRADATION IN WATER THROUGH A HETEROGENEOUS PHOTO-FENTON PROCESS Beatrice Iurascu 1 , Ilie Siminiceanu 1∗ , Miguel Vincente 2 “Gh. Asachi” Technical University of Iasi, Faculty of Chemical Engineering, Department of Engineering Inorganic Substances, 71A D.Mangeron Bd., 700050 - Iasi, Romania 2 University of Salamanca, Department of Inorganic Chemistry, Spain Abstract A new photo-Fenton catalyst has been manufactured from synthetic layered clay laponite (Laponite RD) by the pillaring technique Eight different catalyst samples were prepared: four without thermal aging (WTA) calcined at 523 0 K, 623 0 K, 723 0 K and 823 0 K, and other four with thermal aging (TA) calcined at the same temperatures. The activity of the TA- 623 sample was evaluated in the phenol degradation by the photo- Fenton process. The influence of five important operating factors has been studied experimentally: the wavelength of the light source (UV-C and UV-A); catalyst dose( 0 to 2 g/L), initial phenol concentration ( 0.5 to 1.5 mM), hydrogen peroxide initial concentration ( 20 to 100 mM) and th initial solution pH (2.5 to 3.5 ) at 303 K.The results have shown that the almost complete conversion was possible , after only 5 minutes, under the following operating conditions: a low pressure mercury lamp as source of UV-C of 254 nm; pH3; a dose of 1 g catalyst/ L, a hydrogen peroxide concentration of 50 mM for a solution containing 1mM phenol , at 303 K. Key words: phenol degradation, Fe- Lap-RD catalyst, photo- Fenton, kinetic experiments, factor influence 1. Introduction The phenols have become the most abundant pollutants in industrial wastewater, due to their wide utilization in different industries (Almaizy and Akgerman, 2000; He et al., 2005; Kusic et al., 2006). Their presence contributes notably to the pollution of the effluents due to their high toxicity to aquatic life. The LD 50 dose for aquatic organisms, determined on Daphnia is 12 mg phenol/L in 48 hours. They also may cause carcinogenic and mutagenic effects to humans (Kusic et al., 2006). Therefore, the maximum concentration of phenol in EU in water is 0.5 µg/L. Common commercial wastewater treatment methods utilize the combination of the biological, physical and chemical treatment (Droste, 1997; Gogate and Pandit, 2004a/b).The biological treatment units tend to become very large due to the slow biological reactions. The physical methods only transfer waste components from one phase to another. Chemical treatment of phenols, such as chlorination, can result in formation of chlorinated phenols and their byproducts which have been reported as toxic and non biodegradable (Gogate and Pandit, 2004a). An attractive alternative for the removal of organic contaminants from wastewater are the so called advanced oxidation processes (AOPs) which generate hydroxyl radicals in sufficient quantities to oxidize the majority of the organics present in the effluent water (Siminiceanu, 2003). The AOPs used in the laboratory studies for phenol degradation have been reviewed and compared (Esplugas et al., 2002; Gimeno et al., 2005).The photo-Fenton process has been found the most effective among the investigated AOPs. The high effectiveness of the photo-Fenton process is attributed to the formation of hydroxyl radicals (HO . ) in the reaction (1), and the regeneration of Fe(II) ions by photo- reduction of Fe(III) ions (reaction 2): Fe 2+ + H 2 O 2 + hν = Fe (OH) 2+ + HO . (1) ∗ Author to whom all correspondence should be addressed: isiminic@ch.tuiasi.ro

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