Here, the authors (i) discuss the most prominent co‐catalyst for H2 generation structured in the form of Me‐TiO2/MCM‐41 (Me: Ag, Co, Cu, Ni) based on structural, electronic, textural, morphological and optical characterization techniques, such as XRD, wide and small angle, XPS, Fourier‐transform infrared spectroscopy, scanning electron microscopy, B.E.T., textural analysis, photoacoustic spectroscopy and photoluminescence spectroscopy; and (ii) evaluate the difference in hydrogen production in two distinct geometric reactors based on a theoretical study of light distribution inside the reactors supported by the experimental quantum yield calculation. As a result, copper‐doped photocatalyst generated higher hydrogen amount compared to the others. The high photocatalyst performance was due to the greater lamp spectrum absorption, marked by the low bandgap value, and high photoactivity justified by the low rate of electronic recombination. The hydrogen generation in the quartz reactor was seven times higher than the annular one, and when at maximum light power, it is comparable to the most sophisticated reaction systems found in literature. The larger light exposure area per unit volume of the quartz reactor compared to the annular one is the reason why it obtained better results due to the lower emitted photon blockade, with a 1.81% apparent quantum yield.
Fotodegradação de corante textil azul RB 250 e produção Fotocatalítica de H 2 utilizando TiO 2 Nano suportado em Zeolita ZSM-5 RB 250 blue dye photodegradation and H 2 Photocatalytic production using TiO 2 Nano supported on Zeolite ZSM-5
Alexandre Augusto de Andrade
3RESUMO: Os Resíduos Dregs e a Lama de Cal são gerados nas indústrias papeleiras que utilizam o ciclo de recuperação química em seu processo de fabricação, esses resíduos são destinados, geralmente, em aterros industriais provocando um custo econômico e ambiental para o gerador. Os estudos realizados para minimizar esses impactos envolvem a utilização desses resíduos como parte da matéria prima para fabricação de tijolos. Para o processo de fabricação dos tijolos serão feitas misturas entre os resíduos e a argila, onde passaram pelos testes de perda ao fogo, retração linear, tensão de ruptura, absorção de água e densidade aparente que revelaram a qualidade desses tijolos, mostrando se os mesmos obedecem aos padrões estabelecidos pela ABNT. A partir dos resultados, foi feita comparação entre as porcentagens das misturas e a argila em si, comprovando que é possível a utilização desses resíduos para a fabricação de tijolos.
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