1,720,968 research outputs found
Degradation Of Dipyrone By The Electro-fenton Process In An Electrochemical Flow Reactor With A Modified Gas Diffusion Electrode
No full textThe increasing occurrence of antibiotics and their metabolites in surface and ground waters is causing a significant impact on the environment and needing of developing novel treatments for the complete removal of such contaminants. This paper presents the study of the electrogeneration of hydrogen peroxide (H2O2) in acidic medium and the degradation of the analgesic dipyrone in an electrochemical flow reactor using a gas diffusion electrode (GDE) modified with 5.0% cobalt (II) phthalocyanine (CoPc) and pressurized with O2. The highest yield of H2O2(133 mg L-1) was achieved after 90 min of electrolysis at an applied potential of -2.1 V (vs. Pt//Ag/AgCl/KCls) and the best results for degradation of dipyrone were obtained under electro-Fenton conditions, where the total organic carbon (TOC) was reduced 62.8% after 90 min of reaction and 49.1 kW h of energy was consumed per kg of dipyrone degraded.25916731680Joss, A., Zabczynski, S., Gobel, A., Hoffmann, B., Loffler, D., McArdell, C.S., Ternes, T.A., Siegrist, H., (2006) Water Res., 40, p. 1686Carballa, M., Omil, F., Ternes, T., Lema, J.M., (2007) Water Res., 41, p. 2139Bila, D.M., Dezotti, M., (2003) Quim. Nova, 26, p. 523Tauxe-Wuersch, A., De Alencastro, L.F., Grandjean, D., Tarradellas, J., (2005) Water Res., 39, p. 1761Kasprzyk-Hordern, B., Dinsdale, R.M., Guwy, A.J., (2008) Water Res., 42, p. 3498Al Aukidy, M., Verlicchi, P., Jelic, A., Petrovic, M., Barcelò, D., (2012) Sci. Total Environ., 438, p. 15Martínez Bueno, M.J., Hernando, M.D., Herrera, S., Gómez, M.J., Fernández-Alba, A.R., Bustamante, I., García-Calvo, E., (2010) Int. J. Environ. Anal. Chem., 90, p. 321Vystavna, Y., Huneau, F., Grynenko, V., Vergeles, Y., Celle-Jeanton, H., Tapie, N., Budzinski, H., Le Coustumer, P., (2012) Water, Air, Soil Pollut., 223, p. 2111Nikolaou, A., Meric, S., Fatta, D., (2007) Anal. Bioanal. Chem., 387, p. 1225Zylber-Katz, E., Granit, L., Levy, M., (1992) Eur. J. Clin. Pharmacol., 42, p. 187Arkhipchuk, V.V., Goncharuk, V.V., Chernykh, V.P., Maloshtan, L.N., Gritsenko, I.S., (2004) J. Appl. Toxicol., 24, p. 401Wiegel, S., Aulinger, A., Brockmeyer, R., Harms, H., Loffler, J., Reincke, H., Schmidt, R., Wanke, A., (2004) Chemosphere, 57, p. 107Fent, K., Weston, A.A., Caminada, D., (2006) Aquat. Toxicol., 76, p. 122Gomez, M.J., Martinez Bueno, M.J., Lacorte, S., Fernandez-Alba, A.R., Aguera, A., (2007) Chemosphere, 66, p. 993Nikolova, I., Tencheva, J., Voinikov, J., Petkova, V., Benbasat, N., Danchev, N., (2012) Biotechnol. Biotechnol. Equip., 26, p. 3329Gomez, M.J., Sirtori, C., Mezcua, M., Fernandez-Alba, A.R., Aguera, A., (2008) Water Res., 42, p. 2698Reis, R.M., Baio, J.A.F., Migliorini, F.L., Rocha, R.S., Baldan, M.R., Ferreira, N.G., Lanza, M.R.V., (2013) J. Electroanal. Chem., 690, p. 89Huang, C.P., Dong, C., Tang, Z., (1993) Waste Manage., 13, p. 361Neyens, E., Baeyens, J., (2003) J. Hazard Mater., 98, p. 35Mininni, G., Sbrilli, A., Guerriero, G., Rotatori, M., (2004) Chemosphere, 54, p. 1337Beati, A.A.G.F., Rocha, R.S., Oliveira, J.G., Lanza, M.R.V., (2009) Quim. Nova, 32, p. 125Rocha, R.S., Beati, A.A.G.F., Oliveira, J.G., Lanza, M.R.V., (2009) Quim. Nova, 32, p. 354Assumpc¸ão, M.H.M.T., Moraes, A., De Souza, R.F.B., Gaubeur, I., Oliveira, R.T.S., Antonin, V.S., Malpass, G.R.P., Santos, M.C., (2012) Appl. Catal.-A: Gen., 411-412, p. 1Reis, R.M., Beati, A.A.G.F., Rocha, R.S., Assumpc¸ão, M.H.M.T., Santos, M.C., Bertazzoli, R., Lanza, M.R.V., (2012) Ind. Eng. Chem. Res., 51, p. 649Yeager, E., (1984) Electrochim. Acta, 29, p. 1527Kinoshita, K., (1988) Carbon: Electrochemical and Physicochemical Properties, , Wiley: New York, USALipkowski, J., Ross, P., (2008) Electrocatalysis, , Wiley-VCH: New York, USACordeiro, G.S., Rocha, R.S., Valim, R.B., Migliorini, F.L., Baldan, M.R., Lanza, M.R.V., Ferreira, N.G., (2013) Diamond Relat. Mater., 32, p. 54Rocha, R.S., Reis, R.M., Beati, A.A.G.F., Sotomayor, M.D.P.T., Bertazzoli, R., Lanza, M.R.V., (2012) Quim. Nova, 35, p. 1961Barros, W.R.P., Reis, R.M., Rocha, R.S., Lanza, M.R.V., (2013) Electrochim. Acta, 104, p. 12Beati, A.A.G.F., Reis, R.M., Rocha, R.S., Lanza, M.R.V., (2012) Ind. Eng. Chem. Res., 51, p. 5367Rezende, L.G.P., Prado, V.M., Rocha, R.S., Beati, A.A.G.F., Sotomayor, M.D.P.T., Lanza, M.R.V., (2010) Quim. Nova, 33, p. 1088Ikehata, K., Naghashkar, N.J., El-Din, M.G., (2006) Ozone: Sci. Eng., 28, p. 353Fan, Y., Ai, Z., Zhang, L., (2010) J. Hazard Mater., 176, p. 678Poyatos, J.M., Muñio, M.M., Almecija, M.C., Torres, J.C., Hontoria, E., Osorio, F., (2010) Water, Air, Soil Pollut., 205, p. 187Giri, A.S., Golder, A.K., (2014) Ind. Eng. Chem. Res., 53, p. 1351Assumpc¸ão, M.H.M.T., Moraes, A., De Souza, R.F.B., Reis, R.M., Rocha, R.S., Gaubeur, I., Calegaro, M.L., Santos, M.C., (2013) Appl. Catal.-A: Gen., 462-463, p. 25
Electrochemical Degradation Of The Chloramphenicol At Flow Reactor. [degradação Eletroquímica Do Cloranfenicol Em Reator De Fluxo]
No full textThis paper reports a study of electrochemical degradation of the chloramphenicol antibiotic in aqueous medium using a flow-by reactor with DSA® anode. The process efficiency was monitored by chloramphenicol concentration analysis with liquid chromatography (HPLC) during the experiments. Analysis of Total Organic Carbon (TOC) was performed to estimate the degradation degree and Ion Chromatography (IC) was performed to determinate inorganic ions formed during the eletrochemical degradation process. In electrochemical flow-by reactor, 52% of chloramphenicol was degraded, with 12% TOC reduction. IC analysis showed the production of chloride ions (25 mg L -1), nitrate ions (6 mg L-1) and nitrite ions (4.5 mg L-1).33510881092Bila, D.M., Desotti, M., (2003) Quim. Nova, 26, p. 523Mispagel, H., Gray, J.T., (2005) Water Environ.Res, 77, p. 2996Peng, X., Wang, Z., Kuang, W., Tan, J., Li, K., (2006) Sci. Total Environ, 371, p. 314Peng, X., Tan, J., Tang, C., Yu, Y., Wang, Z., (2008) Environ. Toxicol. Chem, 27, p. 73Zeegers, F., Gibella, M., Tilquin, B., (1997) Radiat. Phys. Chem, 50, p. 149Chatzitakis, A., Berberidou, C., Paspaltsis, I., Kyriakou, G., Sklaviadis, T., Poulios, I., (2008) Water Res, 42, p. 386Di Bernardo, L., Dantas, A.D.B., (2005) Métodos e Técnicas de Tratamento de água, , 2a ed., Rima: São PauloFaria, L.A., Boodts, J.F.C., Trassati, S., (1992) Electrochim. Acta, 37, p. 2511Comninellis, Ch., Sequeira, C.A.C., (1994) Environmental Oriented Electrochemistry, 77Forti, G., Gandini, D., Comninellis, Ch., (1997) Curr. Top. Electrochem, 5, p. 71Simond, O., Schaller, V., Comninellis, Ch., (1997) Electrochim. Acta, 42, p. 2009Trassati, S., (2000) Electrochim. Acta, 45, p. 2377Comninellis, Ch., (1994) Electrochim. Acta, 39, p. 1857Rocha, R.S., Beati, A.A.G.F., Oliveira, J.G., Lanza, M.R.V., (2009) Quim. Nova, 32, p. 354Beati, A.A.G.F., Rocha, R.S., Oliveira, J.G., Lanza, M.R.V., (2009) Quim. Nova, 32, p. 125(1942) The Pharmacopeia of the United States of America, p. 373. , Mack Printing: EastonForti, J.C., Rocha, R.S., Lanza, M.R.V., Bertazzoli, R., (2007) J. Electroanal. Chem, 601, p. 63Forti, J.C., Nunes, J.A., Lanza, M.R.V., Bertazzoli, R., (2007) J. Appl. Electrochem, 37, p. 527Solomons, T.W.G., (2006) Química Orgǎnica, 2. , 8a ed.,Livros Técnicos e Científicos: Rio de Janeir
Electrosynthesis Of Methanol From Methane: The Role Of V2o 5 In The Reaction Selectivity For Methanol Of A Tio 2/ruo2/v2o5 Gas Diffusion Electrode
No full textMethane fed TiO2/RuO2/PTFE gas diffusion electrodes (GDEs) have been used for the electrosynthesis of methanol in 0.1 mol L -1 of Na2SO4 supporting electrolyte. By-products such as formaldehyde and formic acid are usually also formed during electrolyses, with the latter formed at a similar rate as that of methanol. In this study, V2O5 was added to the composition of the GDE to improve its selectivity for methanol. TiO2/RuO2/V 2O5 powder hot-pressed with PTFE resulted in a GDE suitable for oxidative electrosynthesis with simultaneous oxygen evolution. By feeding the TiO2/RuO2/V2O5/PTFE GDE with methane, it was possible to enhance its selectivity for methanol at low values of current density. Furthermore, the formation of formic acid and formaldehyde was suppressed, allowing for higher current efficiencies. The addition of 5.6% of V2O5 increased the electrode's current efficiency to 57% at 2.0 V, which is 2-fold higher than the efficiency achieved in the absence of vanadium oxide. © 2012 Elsevier Ltd.87606610Rocha, R.S., Amargo, L.M.C., Lanza, M.R.V., Bertazzoli, R., A Feasibility Study of the Electro-recycling of Greenhouse Gases: Design and Characterization of a (TiO2/RuO2)/PTFE Gas Diffusion Electrode for the Electrosynthesis of Methanol from Methane (2010) Electrocatalysis, 1, p. 224Rocha, R.S., Lanza, M.R.V., Bertazzoli, R., Electrosynthesis of Ethylene Glycol from Oxidation of Ethylene Using a TiO2-RuO2/PTFE Gas Diffusion Electrode (2011) Electrocatalysis, 2, p. 273Fóti, G., Gandini, D., Comninellis, Ch., Anodic oxidation of organics on thermally prepared oxide electrodes (1997) Current Topics in Electrochemisty, 5, p. 71Rocha, R.S., V, M.R., Lanza, Bertazzoli, R., (2011) Electrochemical Process of Synthesis Os Alcohols Using Gas Diffusion Electrodes, , BR Patent PI 1102137-3Rocha, R.S., V, M.R., Lanza, Bertazzoli, R., (2011) Gas Diffusion Electrode, Process for Obtaining Gas Diffusion Electrodes and Their Uses, , BR Patent PI 1102984-6Sen, A., Benvenuto, M.A., Lin, M., Hutson, A.C., Basickes, N., Activation of methane and ethane and their selective oxidation to the alcohols in protic media (1994) Journal of the American Chemical Society, 116, p. 998Chen, L., Yang, B., Zhang, X., Dong, W., Cao, K., Zhang, X., Methane Oxidation over a V2O5 catalyst in the liquid phase (2006) Energy & Fuels, 20, p. 915Forti, J.C., Rocha, R.S., Lanza, M.R.V., Bertazzoli, R., Electrochemical synthesis of hydrogen peroxide on oxygen-fed graphite/PTFE electrodes modified by 2-ethylanthraquinone (2007) Journal of Electroanalytical Chemistry, 601, p. 63Galizzioli, D., Tantardini, F., Trasatti, S., Ruthenium dioxide: A new electrode material. I. Behaviour in acid solutions of inert electrolytes (1974) Journal of Applied Electrochemistry, 1, p. 57De Faria, L.A., Boodts, J.F.C., Trasatti, S., Physico-chemical and electrochemical characterization of Ru-based ternary oxides containing Ti and Ce (1992) Electrochimica Acta, 37, p. 2511Lassali, T.A.F., Boodts, J.F.C., De Castro, S.C., Landers, R., Trassati, S., UHV and electrochemical studies of the surface properties of Ru+Pt+Ti mixed oxide electrodes (1994) Electrochimica Acta, 39, p. 95Pelegrino, R.R.L., Vicentin, L.C., De Andrade, A.R., Bertazzoli, R., Thirty minutes laser calcination method for the preparation of DSA® type oxide electrodes (2002) Electrochemistry Communications, 4, p. 139Liu, A., Ichihara, M., Honma, I., Zhou, H., Vanadium-oxide nanotubes: Synthesis and template-related electrochemical properties (2007) Electrochemistry Communications, 9, p. 1766Guerra, E., Ciuffi, K.J., Oliveira, H.P., V2O5 xerogel-poly(ethylene oxide) hybrid material: Synthesis, characterization, and electrochemical properties (2006) Journal of Solid State Chemistry, 179, p. 381
A Feasibility Study Of The Electro-recycling Of Greenhouse Gases: Design And Characterization Of A (tio 2/ruo 2)/ptfe Gas Diffusion Electrode For The Electrosynthesis Of Methanol From Methane
No full textThe investigation reported in this paper aims the recycling of greenhouse gases and their conversion into fuels or useful chemicals. In the present work, a (TiO 2/RuO 2)/PTFE gas diffusion electrode (GDE) was designed and characterized to be used in the electrochemical conversion of methane into methanol in conditions of simultaneous oxygen evolution. The GDE was obtained by pressing and sintering TiO 2(0. 7)/RuO 2(0. 3) powder and PTFE and used for the electrosynthesis of methanol from methane. In the experiments, methane was inserted into the reaction medium by the GDE and electrosynthesis was carried out in 0. 1 mol L -1 Na 2SO 4 supporting electrolyte. Controlled potential experiments showed that methanol concentration increased with applied potential, reaching 220 mg L -1 cm 2, at 2. 2 V vs. a calomel reference electrode and current efficiency for methanol formation was 30%. Mass spectrometry data also indicated the formation of formaldehyde and formic acid, the latter at a similar rate as that of methanol. © 2010 Springer.14224229Niyazymbetov ME, Electrochemical methods in organic chemistry of valuable intermediates, , http://www.electrosynthesis.com/news/news.html, (Watts New, 3, 1997), Accessed 18 Nov 2009Centi, G., Perathomer, S., (2009) Top Catal, 52, p. 948Benson, E.E., Kubiak, C.P., Sathrum, A.J., Smieja, J.M., (2009) Chem Soc Rev, 38, p. 89Olah, G.A., Goeppert, A., Prakash, G.K.S., (2009) J Org Chem, 74, p. 487Hamann, C.H., Hamnett, A., Vielstich, W., (1998) Electrochemistry, , NY: Wiley-VCHMoussallem, I., Jorissen, J., Kunz, U., Pinnow, S., Turek, T., (2008) J Appl Electrochem, 38, p. 1177Forti, J.C., Rocha, R.S., Lanza, M.R.V., Bertazzoli, R., (2007) J Electroanal Chem, 601, p. 63Trasatti, S., (2000) Electrochim Acta, 45, p. 2377Environmental oriented electrochemistry, p. 77. , Ch. Comninellis, in C. A. C Sequeira (Ed.), (Elsevier, Amsterdam, 1994)Fóti, G., Gandini, D., Comninellis, C., (1997) Curr Top Electrochem, 5, p. 71Simond, O., Schaller, V., Comninellis, C., (1997) Electrochim Acta, 42, p. 2009Forti, J.C., Olivi, P., de Andrade, A.R., (2001) Electrocim Acta, 47, p. 913Oliveira-Sousa, A., da Silva, M.A.S., Machado, S.A.S., Avaca, L.A., Lima-Neto, P., (2000) Electrochim Acta, 45, p. 4467Forti, J.C., Numes, J.A., Lanza, M.R.V., Bertazzoli, R., (2007) J Appl Electrochem, 37, p. 527Pelegrino, R.R.L., Vicentin, L.C., de Andrade, A.R., Bertazzoli, R., (2002) Electrochem Comn., 4, p. 13
Development And Evaluation Of Gas Diffusion Electrodes (gde) For Generation Of H2o2 In Situ And Their Application In The Degradation Of Reactive Blue 19 Dye [desenvolvimento E Avaliação De Eletrodos De Difusão Gasosa (edg) Para Geração De H2o2 In Situ E Sua Aplicação Na Degradação Do Corante Reativo Azul 19]
No full textThis work reports the development of GDE for electrogeneration of H 2O2 and their application in the degradation process of Reactive Blue 19 dye. GDE produced by carbon black with 20% polytetrafluoroethylene generated up to 500 mg L-1 of H 2O2 through the electrolysis of acidic medium at -0.8 V vs Ag/AgCl. Reactive Blue 19 dye was degraded most efficiently with H 2O2 electrogenerated in the presence of Fe(II) ions, leading to removal of 95% of the original color and 39% of TOC at -0.8 V vs Ag/AgCl.351019611966Amadelli, R., Bonato, T., De Battisti, A., Velichenko, A., Babak, A., (1998) Proceedings of the Symposium on Energy An Electrochemical Processing for A Cleaner Environment;, , Walton, C. W.Rudd, E. J., eds.The Electrochemical Society: New Jersey, chap. 6Baloch, M., (2011) Water Environ. J., 25, p. 171Hirvonen, A., Tuhkanen, T., Kalliokoski, P., (1996) Water Sci. Technol., 33, p. 67Lopez, A., Bozzi, A., Mascolo, G., Kiwi, J., (2003) J. Photochem. Photobiol., 156, p. 121Le, C., Wu, J.-H., Li, P., Wang, X., Zhu, N.-W., Wu, P.-X., Yang, B., (2011) Water Sci. Technol., 64, p. 754Ho, C.-H., Chen, L., Yang, C.-L., (2011) Environ. Eng. Sci., 28, p. 53Petrucci, E., Montanaro, D., (2011) Chem. Eng. J., 174, p. 612Reis, R.M., Betai, A.A.G.F., Rocha, R.S., Assumpção, M.H.M.T., Santos, M.C., Bertazzoli, R., Lanza, M.R.V., (2012) Ind. Eng. Chem. Res., 51, p. 649Comninellis, C., (1994) Electrochim. Acta, 39, p. 1857Ragnini, C.A.R., Di Iglia, R.A., Bertazzoli, R., (2001) Quim. Nova, 24, p. 252Brillas, E., Batista, R.M., Llosa, E., Casado, J., (1995) J. Electrochem. Soc., 142, p. 1733Brillas, E., Mur, E., Casado, J., (1996) J. Electrochem. Soc., 143, pp. L49Guinea, E., Arias, C., Cabot, C.A., Garrido, J.A., Rodríguez, R.M., Centellas, F., Brillas, E., (2008) Water Res, 42, p. 499Guinea, E., Garrido, J.A., Rodríguez, E.M., Cabot, P.-L., Arias, C., Centellas, F., Brillas, E., (2010) Electrochim. Acta, 55, p. 2101Gallegos-Alverez, A., Pletcher, D., (1999) Electrochim. Acta, 44, p. 2483Thevenet, F., Couble, J., Bradhorst, M., Dubois, J.L.E., Puzenat, E., Guillard, C., Bianchi, D., (2010) Plasma Chem. Plasma Process, 30, p. 489Teranishi, M., Naya, S., Tada, H., (2010) J. Am. Chem. Soc., 132, p. 7850Nomura, Y., Ishihara, T., Hata, Y., Kitawaki, K., Kaneko, K., Matsumoto, H., (2008) Chem. Sus. Chem., 1, p. 619Fu, L., You, S., Yang, F., Ming-Ming, G., Fang, X., Zhang, G., (2010) J. Chem. Technol. Biotechnol., 85, p. 715Beati, A.G.F., Rocha, R.S., Oliveira, J.G., Lanza, M.R.V., (2009) Quim. Nova, 32, p. 125Forti, J.C., Nunes, J.A., Lanza, M.R.V., Bertazzoli, R., (2007) J. Appl. Electrochem., 37, p. 527Forti, J.C., Rocha, R.S., Lanza, M.R.V., Bertazzoli, R., (2007) J. Electroanal. Chem., 601, p. 63Harrington, T., Pletcher, D., (1999) J. Electrochem. Soc., 146, p. 2983Ticianelli, E., Camara, G., Santos, L., (2005) Quim. Nova, 28, p. 664Guillet, N., Roué, L., Marcotte, S., Villers, D., Dodelet, J., Chhim, N., Trévin, S., (2006) J. Appl. Electrochem., 36, p. 863Alonso-Vante, N., Tributsch, H., Solorza-Feria, O., (1995) Electrochim. Acta, 40, p. 567Jakobs, R., Janssen, L., Barendrecht, E., (1995) Electrochim. Acta, 30, p. 1085Yamanaka, I., Hashimoto, T., Ichihashi, R., Otsuka, K., (2008) Electrochim. Acta, 53, p. 4824Catanho, M., Malpass, G.R.P., Motheo, A.J., (2006) Quim. Nova, 29, p. 983Gözmen, B., Kayan, B., Gizir, A.M., Hesenov, A., (2009) J. Hazard. Mater., 168, p. 129Song, S., Yao, J., He, Z., Qiu, J., Chen, J., (2008) J. Hazard. Mater., 152, p. 204Raghu, S., Leeb, C.W., Chellammal, S., Palanichamy, S., Basha, C.A., (2009) J. Hazard. Mater., 171, p. 748Chang, S.-H., Chuang, S.-H., Li, H.-C., Liang, H.-H., Huang, L.-C., (2009) J. Hazard. Mater., 166, p. 1279Ozcan, A., Sahin, Y., Koparal, A.S., Oturan, M.A., (2008) J. Electroanal. Chem., 616, p. 71Sheng, Y., Song, S., Wang, X., Song, L., Wang, C., Sun, H., Niu, X., (2011) Electrochim. Acta, 56, p. 8651He, Z., Lin, L., Song, S., Xia, M., Xu, L., Ying, H., (2008) Chen J. Sep. Purif. Technol., 62, p. 376El-Desoky, H.S., Ghoneim, M.M., El-Sheikh, R., Zidan, N.M., (2010) J. Hazard Mater., 175, p. 858Paterlini, W.C., Nogueira, R.F.P., (2005) Chemosphere, 58, p. 1107Nogueria, R.F.P., Trovó, A.G., Silva, M.R.A., Villa, R.D., Oliveira, M.C., (2007) Quim. Nova, 30, p. 400Torrados, F., Pérez, M., Mansilla, H.D., Peral, J., (2003) Chemosphere, 53, p. 121
Study Of The Ranitidine Degradation By H2o2 Electrogenerated/fenton In A Electrochemical Reactor With Gas Diffusion Electrode [estudo Da Degradação De Ranitidina Via H2o 2 Eletrogerado/fenton Em Um Reator Eletroquímico Com Eletrodos De Difusão Gasosa]
No full textThe study of the electrochemical degradation of the ranitidine was developed using an electrochemical reactor with a gas diffusion electrode (GDE) as cathode. The electrolysis experiments was performed at constant current (1 ≤ A ≤ 10) and flow rate of 200 L h-1. The process of drug degradation, chemical/electrochemical and electro-Fenton ways, using electrochemical reactor showed best efficiency at current values of ≥ 4 A. The process reached a production of 630 mg L-1 of the H 2O2 at 7 A. The ranitidine concentrations was reduced in 99.9% (HPLC) and chemical oxygen demand (COD) was reduced in 86.7% by electio-Fenton.321125130Stumpf, M., Ternes, T.A., Wilken, R., Rodrigues, S.V., Baumann, W., (1999) Sci. Total Environ, 225, p. 135Ternes, T.A., (1998) Water Res, 32, p. 3245Ternes, T.A., Stumpf, M., Mueller, J., Haberer, K., Wilken, R.-D., Servos, M., (1999) Sci. Total Environ, 225, p. 81Bower, C.K., Daeschel, M.A., (1999) Int. J. Food Microbiol, 50, p. 33Guardabassi, L., Wong, D.M.A.L., Dalsgaard, A., (2002) Water Res, 36, p. 1955Guillemot, D., (1999) Curr. Opin. Microbiol, 2, p. 494Mckeon, D.M., Calabrese, J.P., Bissonnette, G.K., (1995) Water Res, 29, p. 1902Miranda, C.D., Castillo, G., (1998) Sci. Total Environ, 224, p. 167Bila, D.M., Dezotti, M., (2003) Quim. Nova, 26, p. 523Braue, P.M., Cavalcanti, J.E.W.A., (1993) Manual de Tratamento de Águas Residuárias Industrials, , CETESB: São PauloTicianelli, E.A., Gonzalez, E.R., (2005) Eletroquímica: Princípios e Aplicações, , 2a ed, São PauloHarris, D.C., (2001) Análise Química Quantitativa, , 5 a ed, Rio de JaneiroAmadelli, R., Bonato, T., De Battisti, A., Velichenko, A., (1998) Proc. Electrochem .Soc, 97, p. 28Pletcher, D., Ponce, D.L., (1995) J. Appl. Electrochem, 25, p. 307Nogueira, R.F.P., Trovó, A.G., Silva, M.R.A., Villa, R.D., (2007) Quim. Nova, 30, p. 400Forti, J.C., Nunes, J.A., Lanza, M.R.V., Bertazzoli, R., (2007) J. Appl. Electrochem, 37, p. 527Forti, J.C., Rocha, R.S., Lanza, M.R.Y., Bertazzoli, R., (2007) J. Electroanal. Chem, 63, p. 601Harrington, T., Pletcher, D., (1999) J. Electrochem. Soc, 8, p. 146Florey, K., (1986) Analitical Profiles of Drug Substances, , Academic Press: New YorkFranson, M.A.H., (2005) Standardmethods for the examination of water & wastewater, , 21st ed, Contennnial Edition: Waashingto
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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