Alternatives for the use of açaí seed have been investigated to remove caffeine from aqueous solutions. The pyrolytic process was conducted under two temperatures and heating rates (400 °C, 10 °C min−1 600 50 min−1), with a vacuum pump coupled operating at 20 kPa biochar activated K2CO3, resulting in CA-SA 400/10 600/50. Density, moisture, volatile ash content were evaluated biomass, as well th...

Abstract The present study revealed for the first time removal of hexavalent chromium Cr(VI) with a high efficiency using an eco-friendly composite beads alginate green alga Ulva fasciata compared to calcium beads. This conclusion was reached in this from comparison by well-known biosorbent material, (CA) studied alginate/ (CA/UF) biocomposite characterization prepared achieved several techniqu...

In this paper, a facile hydrothermal approach was used to integrate graphitic carbon nitride dots (CNDs) with hetaerolite (ZnMn2O4) at different weight percentages. The morphology, microstructure, texture, electronic, phase composition, and electrochemical properties were identified by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), transmission (TEM...

Abstract This study contributes to the current state of knowledge by highlighting physical–chemical interactions between biochar and dyes. The removal Acid Orange 7 (AO7) dye a modified obtained from wastes mandarin peels (MPs) has been investigated in this work. A dehydration procedure with 80% H 2 SO 4 under reflux was applied produce an innovative MPs then boiled O followed boiling triethyle...

A fotocatálise amplamente empregada no tratamento de efluentes, descontaminação ambiental, degradação poluentes e purificação água residuária, vem surgindo também como uma alternativa para a geração hidrogênio, fonte energia limpa. O seu mecanismo ação reside na radicais hidroxila (•OH), com alto poder oxidante, completa mineralização diversos compostos orgânicos através da reação este radical....

Clay minerals are considered as a promising material in the context of geological barrier for confinement radioactive and industrial waste. Understanding usefulness smectite mineral, this approach, remains insufficient. The deep investigation about structural response/changes, hydrate stability, cation exchange process, permeability, heavy metal/radionuclide adsorption/removal efficiency under ...

A series of MFI-type aluminosilicate catalysts with ultasound-assisted rapid hydrothermal and conventional high temperature methods were synthesized at temperatures 250 300°C. The pure MFI framework was obtained when sonochemical method used prior to the conditions 250°C 3h. samples characterized by XRD, FESEM, BET-BJH, FTIR, TPD-NH 3 TG/DTG analyses. morphological analysis indicated coffin sha...

In this study, the microscopic pore characteristics of shale in marine strata are evaluated. Based on field emission scanning electron microscopy (FE-SEM), low-temperature N 2 adsorption (LT-N GA), low-pressure CO (LP-CO GA) and high-pressure methane (HPMA) experiments, 12 shales from Wufeng–Longmaxi Formations northern Yunnan Guizhou characterized qualitatively quantitatively. Fractal Frenkel–...