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Solar CPC pilot plant photocatalytic degradation of bisphenol A in waters and wastewaters using suspended and supported-TiO2. Influence of photogenerated species |
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| Authors: | Enrico Mendes Saggioro Anabela Sousa Oliveira Thelma Pavesi Margarita Jiménez Tototzintle Manuel Ignacio Maldonado Fábio Verissimo Correia Josino Costa Moreira |
| Institution: | 1. Centro de Estudos da Saúde do Trabalhador e Ecologia Humana - CESTEH, Escola Nacional de Saúde Pública - Funda??o Oswaldo Cruz, Av. Leopoldo Bulh?es, 1480, 21041-210, Rio de Janeiro, Brazil 2. Centro de Química-Física Molecular e IN - Instituto de Nanociencias e Nanotecnologia, Instituto Superior Técnico - CQFM, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal 3. Centro Interdisciplinar de Investiga??o e Inova??o - C3i - Escola Superior de Tecnologia e Gest?o, Instituto Politécnico de Portalegre, Lugar da Abadessa, Apartado 148, 7301-901, Portalegre, Portugal 4. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Plataforma Solar de Almería - CIEMAT, Carretera Sénes, km 4, 04200, Tabernas, Almería, Spain 5. Universidade Federal do Estado do Rio de Janeiro - UNIRIO, Av. Pasteur, 296, 22290-240, Rio de Janeiro, Brazil |
| Abstract: | Photocatalytic degradation of bisphenol A (BPA) in waters and wastewaters in the presence of titanium dioxide (TiO2) was performed under different conditions. Suspensions of the TiO2 were used to compare the degradation efficiency of BPA (20 mg L?1) in batch and compound parabolic collector (CPC) reactors. A TiO2 catalyst supported on glass spheres was prepared (sol–gel method) and used in a CPC solar pilot plant for the photodegradation of BPA (100 μg L?1). The influence of OH·, O2 ·?, and h + on the BPA degradation were evaluated. The radicals OH· and O2 ·? were proved to be the main species involved on BPA photodegradation. Total organic carbon (TOC) and carboxylic acids were determined to evaluate the BPA mineralization during the photodegradation process. Some toxicological effects of BPA and its photoproducts on Eisenia andrei earthworms were evaluated. The results show that the optimal concentration of suspended TiO2 to degrade BPA in batch or CPC reactors was 0.1 g L?1. According to biological tests, the BPA LC50 in 24 h for E. andrei was of 1.7?×?10?2 mg cm?2. The photocatalytic degradation of BPA mediated by TiO2 supported on glass spheres suffered strong influence of the water matrix. On real municipal wastewater treatment plant (MWWTP) secondary effluent, 30 % of BPA remains in solution; nevertheless, the method has the enormous advantage since it eliminates the need of catalyst removal step, reducing the cost of treatment. |
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