Strategies to reduce mass and photons transfer limitations in heterogeneous photocatalytic processes: Hexavalent chromium reduction studies

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Belisa A. Marinho (Autor) FEUP; Raquel O. Cristóvão (Autor) FEUP; Ridha Djellabi (Autor) FEUP; Ana Caseiro (Autor) FEUP; Sandra M. Miranda (Autor) FEUP; José M. Loureiro (Autor) FEUP; Rui A.R. Boaventura (Autor) FEUP; Madalena M. Dias (Autor) FEUP; José Carlos B. Lopes (Autor) FEUP; Vítor J. P. Vilar (Autor) FEUP

Revista

Título: Journal of Environmental Management

Vol. 217

Páginas: 555-564

ISSN: 0301-4797

Editora: Elsevier

Indexação

ISI Web of Knowledge - 8 Citações

ISI Web of Science

Scopus - 22 Citações

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

Projetos Associados

LSRE-LCM - Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais

Outras Informações

ID Authenticus: P-00N-VN6

DOI: 10.1016/j.jenvman.2018.04.003

Abstract (EN): The current work presents different approaches to overcome mass and photon transfer limitations in heterogeneous photocatalytic processes applied to the reduction of hexavalent chromium to its trivalent form in the presence of a sacrificial agent. Two reactor designs were tested, a monolithic tubular photoreactor (MTP) and a micro-meso-structured photoreactor (NETmix), both presenting a high catalyst surface area per reaction liquid volume. In order to reduce photon transfer limitations, the tubular photoreactor was packed with transparent cellulose acetate monolithic structures (CAM) coated with the catalyst by a dip-coating method. For the NETmix reactor, a thin film of photocatalyst was uniformly deposited on the front glass slab (GS) or on the network of channels and chambers imprinted in the back stainless steel slab (SSS) using a spray system. The reaction rate for the NETmix photoreactor was evaluated for two illumination sources, solar light or UVA-LEDs, using the NETmix with the front glass slab or/and back stainless steel slab coated with TiO2-P25. The reusability of the photocatalytic films on the NETmix walls was also evaluated for three consecutive cycles using fresh Cr(VI) solutions. The catalyst reactivity in combination with the NETmix-SSS photoreactor is almost 70 times superior to one obtained with the MTP.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10