Tratamento de efluentes de indústria têxtil pelo processo de adsorção-fotooxidação empregando-se o compósito magnético quitosana-TiO2-óxido de ferro

• Ano de defesa: 2014
• Autor(a) principal: Gusmão, Lucas Luiz
• Orientador(a): Bellato, Carlos Roberto
• Banca de defesa: Moreira, Renata Pereira Lopes , Mounteer, Ann Honor
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Agroquímica
• Departamento: Agroquímica analítica; Agroquímica inorgânica e Físico-química; Agroquímica orgânica
• País: BR
• Palavras-chave em Português: Dióxido de titânio; Quitosana; Oxidação; Corantes; Indústria têxtil
• Palavras-chave em Inglês: Titanium dioxide; Chitosan; Oxidation; Dyes; Textile industry
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS
• Link de acesso: http://locus.ufv.br/handle/123456789/2168

This study aims to evaluate the application of TiO 2 immobilized in the polymer matrix of chitosan (CTS-TiO2) in powder form (< 105 &#61549;m ), in order to induce the adsorption-photooxidation of the contaminant using two heterogeneous photocatalysis processes : TiO2/UV and TiO2/H2O2/UV. Moreover, in this work, the polymer matrix CTS-TiO2 will be combined with the magnetic properties of iron oxide to produce the magnetic composite Chitosan- Titanium Dioxide-Iron Oxide (CTS-TiO2-Fe). Once being magnetic, the composite was removed from the aqueous solution by applying a magnetic field, would reduce, naturally, the cost and time spent on the removal of these materials. The adsorption-photooxidation with the magnetic composite CTS- TiO2-Fe was evaluated aiming its application in discoloration of textile dyes in aqueous medium and in the discoloration of dyes in treated fortified textile effluent. Remazol Blue, Orange 16 and Yellow 3-GP were the selected dyes for studies. In aqueous medium, the magnetic composite CTS-TiO2-Fe showed a high dye discoloration capacity, being 94.8, 83.0 and 85.6 %, to times of 80, 105 and 40 minutes, respectively, for the Remazol Blue, Orange 16 and Yellow 3-GP at pH 7. The magnetic composite CTS-TiO2-Fe showed a predominance of the photooxidative phenomenon over the adsorptive one. The discoloration of Remazol Blue, Orange 16 and Yellow 3-GP in textile effluent achieved a removal percentage of 84.0, 79.3 and 80.1 %, to times of 240, 280 and 200 minutes, respectively. The effect of the addition of hydrogen peroxide (H2O2) in the adsorption-photooxidation with CTS-TiO2-Fe has an important effect, since it results in an increase of color removal from the effluent. The study of reuse of the magnetic composite showed that until the fourth reuse cycle, there is a good removal rate of dyes, which demonstrates the feasibility of reuse of the composite in successive adsorption-photooxidation processes in textile industries. Thus, the magnetic composite CTS-TiO2-Fe can be included as a new photo-oxidative adsorbent, showing excellent performance in photooxidation of dyes and can be used as a new technology applied to the polishing removal of industrial effluents. Among the favorable characteristics, it can be highlight its magnetic character and economic viability, since it consists in non-toxic natural reagents, low cost, easy availability and preparation.