Aviation titanium chemical milling using a high concentration of hydrofluoric acid, resulting in high concentrations of fluorine-containing wastewater; This paper discusses the common method of fluorine-containing waste water treatment and aviation companies against a specific fluorine-containing waste water, chose to produce aviation. industry fluorine-containing wastewater treatment process and device, the device operation results show that: the treated water meet the national emission standards.

Template prepared a new methanol-tolerant oxygen reduction electrocatalyst - nitrogen-doped carbon hollow microspheres @ platinum nanoparticle composites (HNCMS @ PtNPs). First, the platinum nanoparticles supported on amino silica microspheres obtained PtNPs / SiO_2 composites. Then by polymerization of dopamine from the PtNPs / SiO_2 composite wrap Polydopamine (PDA) film, which is directly in a nitrogen atmosphere the carbonization process and remove SiO_2 etching by hydrofluoric acid solution obtained embedded PtNPs nitrogen doping hollow carbon microspheres labeled HNCMS @ PtNPs composites. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, surface area analyzer and X-ray photoelectron spectroscopy on the morphology and structure HNCMS @ PtNPs composites were characterized. Research on the electro-catalytic oxygen reduction performance HNCMS @ PtNPs composites using cyclic voltammetry and linear sweep voltammetry. The results showed that: Pt catalyst loading HNCMS @ PtNPs up to 11.9% (w, mass fraction) for oxygen reduction reaction with high electro-catalytic activity, high stability and excellent resistance to methanol and performance, is a kind of potential direct methanol fuel cells (DMFCs) cathode catalyst.

In nitric acid - hydrochloric acid - hydrofluoric acid digestion system muffle furnace soil composition analysis standard material Gss-2, the method is simple, with less acid and digestive juices clarification, effective, and less interference. At the same time one of the lead, zinc, copper, chromium continuously measured by ICP-AES method with satisfactory results. Soil standard substance of lead, zinc, copper, chromium measured values of several elements are within the scope of quality control, its high, medium and low concentration spiked recoveries were able to reach 95% to 104%, the relative standard deviation between 1.3% to 3.2%. Therefore, the method accuracy and precision to meet the relevant standards of soil, but also simultaneous multi-element analysis, to improve analysis efficiency.