Papers by Keyword: Formaldehyde Degradation

Abstract: A series of manganese oxides (Me-OL-1s, Me: Mg, Fe, Ni and Cu) were synthesized by static hydrothermal and ion-exchange method. The as-prepared samples were characterized by means of X-ray diffraction (XRD), Raman spectroscopy (Raman) and Scanning electron microscope (SEM). The catalytic activity of the Me-OL-1 samples for the formaldehyde degradation was investigated at room temperature. The synthetic Me-OL-1s belong to birnessite-type manganese oxides. All the Me-OL-1 catalysts show the activity for the catalytic oxidation of formaldehyde at room temperature and exhibit the activity order of Fe-OL-1 > Ni-OL-1 > Cu-OL-1 > Mg-OL-1. The removal rates of formaldehyde are increased with increasing contact time.

Abstract: The major indoor air pollution-formaldehyde has been a serious threat to our lives to our lives, and accordingly the formaldehyde degradation has turned into a concerned issue of public. This paper has based on a number of degradation methods and combined the adsorption effect of activated carbon with the catalytic effect of MnO₂ to remove formaldehyde. The results show that the Nano-MnO₂ particles loaded the surface of activated carbon particles possesses smaller sizes, better dispersion and no agglomeration, and consequently the AC/MnO₂ compounds degraded formaldehyde effectively.

Abstract: Tetra-needle like zinc oxide whiskers (T-ZnOw) were doped with Al3+, Fe3+ or Ag+. The morphological structures and the doped ions were characterized, and the results indicated that mostof the Aluminum existed in a second phase of ZnAl2O4, most of the Fe3+ solid-solutioned into the crystal lattice and the silver generated as nano-particles on the surface of the needles of the ZnO whiskers. Anti-bacterial experiments gave the result that Fe3+ doped T-ZnOw and the nano-silver adnascent ZnOw had obvious effect of killing and inhibiting the bacteria such as Staphylococcus Aureus (ATCC 6538), Escherichia Coli (ATCC 25922) and Candida Albicans (ATCC 10231). The minimum inhibitory concentrations (MIC) of the related doping T-ZnOw were 55~440 PPM. Further experiments indicated that there appeared high margin of safety and no stimulation on skins or eyes for the tested animals. Products such as plastics, coatings, fibbers and papers containing 2wt% of the doped T-ZnOw had more than 99% efficiency for anti the mentioned bacteria. Effect of degradation of organic compound for the doped T-ZnOw was also evaluated by degradation of formaldehyde. The mechanism was tentatively put forward to explain the phenomena and the effect of antibiosis.