82 research outputs found
Biorecovery of Cr(VI) from wastewater and its catalytic reutilization
Get PDFThe performance of two zeolites with different structures and acidity properties was
evaluated on the biosorption of Cr(VI) and catalytic oxidation of ethyl acetate. The starting zeolites,
HY and HZSM5, were modified by ion exchange treatments in order to obtain zeolites with different
acidity and sodium content. Arthrobacter viscosus supported on the different zeolites was used for
Cr(VI) recovery from solution. The best removal efficiencies and uptake of chromium were achieved
for the Y zeolites due to their higher ion exchange capacity. The Y and ZSM5 zeolites were
characterized by ICP-AES, SEM, NH3 chemisorption, XRD and N2 adsorption. Y and ZSM5 zeolites
obtained after biosorption of chromium were successfully reused as catalysts in the oxidation of ethyl
acetate. The chromium-loaded ZSM5 zeolites were considerably more active and selective towards
CO2 than chromium-loaded Y zeolites, essentially due to its different framework structure, textural and
acidity properties
Green lacewings (Neuroptera: Chrysopidae) associated with Melon Crop in MossorĂł, Rio Grande do Norte State, Brazil
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Efeitos do envelhecimento tĂ©rmico na microestrutura e na resistĂȘncia Ă corrosĂŁo do metal de solda de aço AISI 317L
Full text linkAntiplaque and antigingivitis effect of Lippia Sidoides: a double-blind clinical study in humans
Full text linkO papel dos grupos de apoio e o compartilhamento da informação e do conhecimento nas avaliaçÔes das instituiçÔes de ensino superior privadas.
Full text linkInfluence of 2% chlorhexidine on pH, calcium release and setting time of a resinous MTA-based root-end filling material
Full text linkPOST-HARVEST QUALITY OF PEQUI (Caryocar brasiliense CAMB.) COLLECTED FROM THE PLANT OR AFTER NATURALLY FALLING OFF AND SUBJECTED TO SLOW AND QUICK FREEZING
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