No abstract

No abstract

Dynamically vulcanized ethylene—propylene—diene/polypropylene (EPDM/PP) elastomers that were reinforced with various amounts of organoclay were prepared using octylphenol—formaldehyde resin and stannous chloride dehydrate as vulcanizing agents. The effects of organoclay on X-ray, mechanical properties, dynamic mechanical analysis, hysteresis, and dynamic properties were studied. X-ray analysis revealed that these organoclay-filled thermoplastic vulcanizates (TPVs) were intercalated. The organoclay improved the mechanical properties of TPVs. Dynamic mechanism analysis indicated that organoclay can increase the damping (tan δ) and storage modulus of EPDM/PP TPVs at ambient temperature. The hysteresis behavior revealed that when the organoclay content exceeded 6 phr, the antivibration performance of these TPVs increased with the organoclay content. The dynamic ratio does not vary greatly as tan δ of EPDM/PP TPVs is increased.

No abstract

Abstract:The photocatalytic degradation of acridine orange (AO) dye by NaBiO 3 photocatalyst under visible light irradiation was investigated systematically. The NaBiO 3 photocatalyst exhibited a higher photocatalytic activity compared to the P25 photocatalyst. After 160 min of photocatalytic reaction, the degradation rate of AO could reach to 99% in appropriate conditions. Factors, such as catalyst dosage, solution pH, initial AO concentration and the presence of anions, were found to influence the degradation rate. To scrutinize the mechanistic details of the dye photodegradation, the intermediates of the processes were separated, identified and characterized by the HPLC-ESI-MS technique. The analytical results indicated that the N-de-methylation degradation of AO dye took place in a stepwise manner to yield mono-, di-, tri-and tetra-N-de-methylated AO species generated during the processes. The probable photodegradation pathways were proposed and discussed.