Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO2

Sulfur-doped TiO2 was prepared by two methods; one was simple oxidation annealing of TiS2, the other was mixing of titanium isopropoxide and thiourea. These two sulfur-doped TiO2 preparations showed fairly different photocatalytic activity under visible light. The dynamics of photogenerated charge carriers were studied by the transient absorption measurement in the region of mid-IR. In both samples, excitation by 532 nm pulse led to photocarrier generation to the same extent. Nevertheless, the reactivity of the photocarriers was totally different. Photogenerated electrons and holes transferred to reactant gas in the latter sample, whereas they did not in the former sample. We attributed the different carrier behavior to the difference in the distribution of S atoms or particle size. These observations can explain the difference in capability of photocatalysis under visible light

Transient IR Absorption Study of Charge Carriers Photogenerated in Sulfur-doped TiO2

Sulfur-doped TiO2 was prepared by two methods; one was simple oxidation annealing of TiS2, the other was mixing of titanium isopropoxide and thiourea. These two sulfur-doped TiO2 preparations showed fairly different photocatalytic activity under visible light. The dynamics of photogenerated charge carriers were studied by the transient absorption measurement in the region of mid-IR. In both samples, excitation by 532 nm pulse led to photocarrier generation to the same extent. Nevertheless, the reactivity of the photocarriers was totally different. Photogenerated electrons and holes transferred to reactant gas in the latter sample, whereas they did not in the former sample. We attributed the different carrier behavior to the difference in the distribution of S atoms or particle size. These observations can explain the difference in capability of photocatalysis under visible light

Hepatitis B Related Polyarteritis Nodosa Presenting Necrotizing Vasculitis in the Hepatobiliary System Successfully Treated with Lamivudine, Plasmapheresis and Glucocorticoid

A 64yearold man was admitted for alithiasic cholecystitis. Necrotizing vasculitis was detected in a gallbladder obtained at the cholecystectomy. Slight elevation of transaminases, HBe antigens and hepatitis BDNA (HBVDNA) were detected in the patient. Intrahepatic necrotizing vasculitis was also detected in the liver biopsy specimen, and he also suffered from peripheral neuropathy of suddenly onset. Based on the diagnosis of hepatitis Brelated polyarteritis nodosa, lamivudine was initially administered, followed by plasmapheresis and glucocorticoid steroid therapy. These treatments brought satisfactory improvement of polyarteritis nodosa without exacerbation of liver function