ABSTRACT Supplying sewerage systems in cities and factories has a high cost, both for design, execution, maintenance. Reinforced concrete exposed to the aggressive acids produced by wastewater microorganisms receives costly coatings avoid corrosion impairment of structural functions. Thus, this systematic review had two main goals: (1) identify supplementary cementitious materials (SCM) that im...

The aim of this study was to evaluate the effects of adding sulfuric acid to sugarcane topssilage on rumen bacteria and whole rumen microorganisms (WRM) and compare the digestibility of sugarcane tops treated with different amount of urea, molasses and sulfuric acid between Holstein cow and Khouzestan buffalo. Regardless of the type of the treatment, potential of gas production (B) by cow WRM (...

Five new 1-hydroxy-2-(1-alkyloxymethyl)-9,10-Anthraquinones (9a-e) have been prepared. Selective nitration of 2-methyl-9,10-anthraquinone, reduction to the corresponding amine, diazotization and treatment by sulfuric acid solution afforded the 1-hydroxy-2-methyl-9,10-anthraquinone in good yield as the key intermediate. Reaction with dimethylsulphate/K2CO3 and subsequen...

Polyetheretherketone (PEEK) is a material suitable for frameworks of fixed dental prostheses. The effect of different surface treatments on the bond strength of PEEK bonded to human dentin was evaluated. One hundred PEEK cylinders (3 mm×3 mm) were divided into five groups according to surface treatment: silica coating, sandblasting with 45 μm Al2O3 particles, etching with 98% sulfuric acid for ...

We report the enhanced capacitance of the Multi-Walled Carbon NanoTubes (MWCNTs) after a chemical unzipping process in concentrated sulfuric acid (H2SO4) and potassium permanganate (KMnO4). The effects of the test duration and temperature were investigated on the unzipping process of the MWCNTs to synthesize the graphene oxide nanoribbons. The SEM and TEM studies were carried out on untreated a...

[reaction: see text] The reaction of CH(4) with CO(2) has been performed in anhydrous acids using VO(acac)(2) and K(2)S(2)O(8) as promoters. NMR analysis establishes that the primary product is a mixed anhydride of acetic acid and the acid solvent. In sulfuric acid, the overall reaction is CH(4) + CO(2) + SO(3) --> CH(3)C(O)-O-SO(3)H. Hydrolysis of the mixed anhydride produces acetic acid and t...

Suminda Hapuarachchi and Thomas G. Chasteen* Department of Chemistry 1003 Bowers Boulevard, CFS317e Sam Houston State University Huntsville, TX 77340, USA E-mail: [email protected] Abstract The chemical interferences of Hg, Sn, Pb , Fe, Bi, and Te in the hydride generation atomic absorption spectrometry (HG-AAS) determination of selenium have been studied but interference from the glassware com...

The cloud layers of Venus are known to have pressures and temperatures comparable those on Earth, but, at the same time, many details about environment inside them unknown. early consensus was that Venusian clouds composed droplets near concentrated sulfuric acid with very limited water availability; newer models, however, suggest a pH range between ?1 1, these imply some form neutralizing agen...