No abstract

The processing of coffee beans generates large amounts of solid and liquid residues. The solid residues (pulp, husk and parchment) represent a serious environmental problem and do not have an adequate destination. In this work, activated carbons (AC) for adsorption of organic compounds were respectively. Thus, a good adsorbent was obtained from coffee pulp, an abundant Brazilian residue.

No abstract

The FERM O concept emerges as a powerful and innovative implement to investigate the role of molecular orbitals applied in the description of breakage and formation of chemical bonds. In this work, Hartree-Fock (HF) and Density Functional Theory (DFT) calculations were carried out for a series of four tridentate ligands and their behavior was analyzed using molecular orb ital (M O) energies. It was observed that HOMO energies are inadequate to describe the Pearson´s Hard and Solf acid-base (HSA B) p ricinple behavior of these compounds. By using the frontier effective-for-reaction molecular orbital (FERM O) concept, the reactions that are driven by HOM O, and those that are not, can be better exp lained, independent of the calculation method used, since both HF and Kohn-Sham methodologies lead to the same FERM O.

No abstract

Fenton-type reactions using transition metal complexes in the decomposition of hydrogen peroxide to hydroxyl radical generation have received special attention due to their advantages over classical homogeneous processes involving soluble iron salts. Thus, the goal of this study was to investigate the use of an iron complex with the ligand pyridine-2,6-dicarboxylic acid (dipicolinic acid or DPA) as a homogeneous catalyst for the oxidation of the quinoline. The synthesized iron complex showed a molar ratio of 1:2 metal/ligand and was efficient in the quinoline oxidation at pH values near neutrality. The tests