Gilberto Maia Brito

Biochar and ashes derived from coffee husk were used as heterogeneous catalysts in the synthesis of biodiesel through a transesterification reaction. The catalysts were obtained from the carbonization, activation, and combustion of raw coffee husks. Their properties were characterized by solid-state 13C and 31P nuclear magnetic resonance (NMR) spec...

The presence of microcontaminants in the water supply system offers adverse impacts. This study analyzed the performance of two powdered activated carbons (PAC1 and PAC2) in the removal of 2,4-D herbicide in ultrapure water (UW) and natural water (NW) to verify the influence of natural organic matter (NOM) on the adsorptive process. The properties...

Eco-green biodiesel is an alternative fuel produced by a sustainable methodology and using renewable sources as feedstock due to its green nature and lower emission of pollutants in comparison with conventional fuels. In this work, biodiesels were produced using an innovative source of catalysts, a mixture of metal hydroxides: lithium-sodium (LiOH...

Activated biocarbons were prepared using biomass wastes: sugarcane bagasse, coconut shell and endocarp of babassu coconut; as a renewable source of low-cost raw materials and without prior treatments. These activated biocarbons were characterized by textural analysis, solid-state ¹³C nuclear magnetic resonance spectroscopy, X-ray diffraction and sc...

Activated carbons are well-known porous materials as an effective adsorbent used for the removal of emerging contaminants, such as herbicides, which are increasingly present in water bodies. Most water treatment plants, specially in Brazil, are unable to completely remove such contaminants by the conventional process and advanced treatment using ac...

Activated biocarbons (ABs) with high specific surface area were prepared by the one-step methodology using three different agricultural biomass wastes: sugarcane bagasse (SB), coconut shell (CS) and endocarp of babassu coconut (EB). These lignocellulosic precursors are generated in large quantities in Brazil (among other countries) and, due to inap...

In this work the partitioning behavior of a third anionic specie, octaedric complex, hexanitrocobaltate [Co(NO2)6]3 was discovered. This anion was partitioned to the polimeric phase in a Aqueous Two Phase System (ATPS) espontaneously. The ATPSs were built by a mixture of stock aqueous solution of polymers Poly(ethylene oxide) (PEO) of average numer...