Two coagulants, aluminum sulfate and ferric chloride, were tested to reduce natural organic matter (NOM) as a pretreatment prior to polyvinylidene fluoride (PVDF) microfiltration (MF) membranes for potable water treatment. The results showed that the two coagulants exhibited different treatment performance in NOM removal. Molecular weight (MW) distributions of NOM in the tested surface raw wate...

The corrosion study of aluminum-based materials is the topic a great scientific attention because increasing applications in many sectors these materials. fluoride ions (F−) effect on behavior pure aluminum deaerated 0.05 M sulfuric acid (H2SO4) solutions at 25 °C was investigated. electrochemical measurements such as open circuit potential and potentiodynamic polarization were accomplished to ...

The formation of transition state mimics of phosphoryl transfer reactions with the metal oxoanion vanadate is a powerful technique in macromolecular crystallography. The tendency of vanadate to form pentacovalent complexes exhibiting trigonal bipyramidal geometry makes this compound a close approximation of the transition state for such reactions. In many cases, vanadate complexes provide the m...

Anode carbon residue is produced in the production of electrolytic aluminum. Its properties need to be studied for secondary utilization. In this paper, mineralogy anode from an aluminum plant Guizhou was studied. The chemical composition, structure, mineral occurrence state main elements, etc, investigated. results show that: mainly composed 14 minerals such as cryolite, cryolithionite, elpaso...

Fluorosed maturation stage enamel is hypomineralized in part due to a delay in the removal of matrix proteins to inhibit final crystal growth. The delay in protein removal is likely related to reduced expression of kallikrein-related peptidase 4 (KLK4), resulting in a reduced matrix proteinase activity that found in fluorosed enamel. Klk4 transcription is known to be regulated in other cell typ...

The paramagnetic resonance of Na 5 AlF 2 (PO 4 ) single crystals with chromium impurity was studied. Cr 3+ centers have been found to replace the triclinic Al positions. In local coordinate system, spectra these were described by spin Hamiltonian rhombic symmetry. addition, vanadium and unidentified symmetry observed. Keywords: ions, aluminum fluoride phosphate, resonance.