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71.
Highly concentrated phenolic wastewater treatment by the photo-Fenton reaction, mechanism study by FTIR-ATR 总被引:3,自引:0,他引:3
Araña J Tello Rendón E Doña Rodríguez JM Herrera Melián JA González Díaz O Pérez Peña J 《Chemosphere》2001,44(5):1017-1023
Phenol degradation by Photo-Fenton reaction has been studied in highly concentrated wastewaters and most intermediate species have been identified by Fourier Transform IR-Spectroscopy with ATR device. During the photodegradation of highly concentrated phenol solutions, the formation of dissolved and precipitate tannin has been observed. The possibility of a Fe3+-Pyrogallol complex formation, previous to the tannin formation, has been proposed too. The complex formation involving Fe3+ ions could be related to the observed Photo-Fenton activity decrease. Tannin formation inhibits the complete mineralization of phenol because *OH radicals attack will produce further condensation steps and the polymer size increase. This fact limits the applicability of the process for highly concentrated phenolic wastes mineralization. However, the tannin precipitation allows its separation from the solution by conventional filtration, and reduction of the corresponding dissolved organic carbon. These observations have been proved from the identification of primary degradation products, catechol and hydroquinone. Catechol is considered to be the first step for the formation of tannins. Degradation process for phenol, catechol and hydroquinone have been monitored by total organic carbon (TOC) measurements along the reaction time span. From these results, a global mechanism for the Photo-Fenton degradation of phenol is proposed. 相似文献
72.
Agrawal Pankaj Araújo Aylanna P. M. Brito Gustavo F. Cavalcanti Shirley N. Alves Amanda M. Freitas Daniel M. G. Mélo Tomás J. A. 《Journal of Polymers and the Environment》2021,29(6):1777-1788
Journal of Polymers and the Environment - This work aims to investigate the effect of organically modified montmorillonite (OMMT) and vermiculite (OVT) clays on the properties of poly(lactic acid)... 相似文献
73.
74.
Prado Tatiana Barbosa Mikaela Renata Funada Araújo Ronalda Silva Garcia Suzi Cristina Melo Adalgisa Jesus Galvani Ana Tereza Brandão Carlos Jesus Silva Renan Lourenço Oliveira Sato Maria Inês Zanoli 《Food and environmental virology》2021,13(4):520-527
Food and Environmental Virology - Hepatitis A virus (HAV) is the major cause of enterically transmitted infectious hepatitis. Between 2016 and 2017, the number of confirmed cases of hepatitis A... 相似文献
75.
Silveira Elaine Divina Rodrigues Benvindo-Souza Marcelino Assis Rhayane Alves dos Santos Cirley Gomes Araújo de Lima Amorim Nathan Pereira Borges Rinneu Elias de Melo Celine de Souza Santos Lia Raquel 《Environmental science and pollution research international》2022,29(10):14279-14287
Environmental Science and Pollution Research - Free-living birds play an important role as bioindicators in natural environments. In this study, we used the micronucleus test and nuclear... 相似文献
76.
Pal Sudip Kumar Masum Md. Mehedi Hassan Salauddin Md. Hossen Md. Arif Ruva Israt Jahan Akhie Afsana Alam 《Environmental science and pollution research international》2023,30(13):36112-36126
Environmental Science and Pollution Research - Urban stormwater runoff is considered as one of the major contributors to nonpoint source that contributes to the pollution of all water resources in... 相似文献
77.
The treatment efficiency, as toxicity removal, of complex effluents from the Industrial District of Cama?ari (BA, Brazil), after biological treatment with activated sludge was evaluated using Microtox. Samples of the equalised effluent (EE) were collected prior to treatment together with samples of the treated effluent (TE), which remained 24 h in the treatment plant. Rehydrated colonies of Vibrio fischeri were exposed to sequential dilutions of EE and TE to assess luminosity interference. Values for EC50 were calculated, together with the respective toxicity units. In all, twenty assays of each effluent type were carried out and the mean toxicity removal was 92.71%, while the chemical oxygen demand (COD) presented mean reduction of 83.04%. There was a variability of an order of magnitude between the Microtox results for the two types of effluents. The mean EC50 values were 2.12 for EE and 47.78% for TE. In spite of its weakness in some conditions, the Microtox system demonstrated to work adequately in assessing effluent toxicity removal in this treatment plant and therefore can be used for further toxicity removal programs. 相似文献
78.
Nolasco Maria E. Lemos Viviane A. S. López Gina Soares Sandra A. Feitosa Johnny P. M. Araújo Bruno S. Ayala Alejandro P. de Azevedo Marleane M. F. Santos Francisco E. P. Cavalcante Rivelino M. 《Journal of Polymers and the Environment》2022,30(7):2862-2874
Journal of Polymers and the Environment - The aim of the present study was to perform morphological and chemical characterizations of microplastics (MPs) found in seawater samples from the coast of... 相似文献
79.
Dias Marcela França Leroy-Freitas Deborah Machado Elayne Cristina da Silva Santos Leticia Leal Cintia Dutra da Rocha Fernandes Gabriel de Araújo Juliana Calábria 《Environmental science and pollution research international》2022,29(24):36088-36099
Environmental Science and Pollution Research - Wastewater tertiary treatment has been pointed out as an effective alternative for reducing the concentration of antibiotic resistant bacteria and... 相似文献
80.
The current study investigated oxidative stress parameters (enzymes activities, metallothionein content and lipid peroxidation) in freshwater fish, Oreochromis niloticus, tilapia exposure to Monjolinho River (in 4 months of year: January, April, July and November). One critical site in Monjolinho River (site B) was assessed in comparison to a reference site (site A). Water pH and oxygen concentration was lower than that recommended by CONAMA (Brazilian National Environmental Committee), resolution 357/2005 for protection of aquatic communities, and ammonium and the metals Cu, Zn, Mn and Fe (on all months) concentrations were higher than the maximum concentration recommended. Glutathione peroxidase (GPx) and superoxide dismutase (SOD) activities were significantly decreased in liver and muscle in tilapia from Monjolinho River, throughout the year, in relation to reference except in gills that SOD activity increased. Glutathione S-transferase (GST) activity was significantly increased in liver of the tilapia from Monjolinho River in all sites, in relation to reference except in gills that GST activity increased in July and decreased in November, suggesting that GST activity could be induced to neutralize the pollutants toxicity. On the other hand, GST activity was significantly decreased in white muscle indicating a toxic effect of pollutants, resulting in a decreased ability of tilapia to perform defense reactions associated to GSTs. The decrease of catalase (CAT) activity in gills of the O. niloticus together with the increase of SOD activity, could explain the increased lipid peroxidation (LPO) level in this organ. Metallothionein levels in liver and gills were significantly high in all sites. Results indicate that the exposure to metals caused severe damage to tissues; despite the consensually assumed antioxidant induction as a sign of exposure to contaminants the effects seem in part to be mediated by suppression of antioxidant system with SOD, CAT and GPx as potential candidates for tissues toxicity biomarkers of pollutants. 相似文献