Kinetics of acetamiprid photolysis in solution.

Photolysis of acetamiprid was investigated in detail under different reaction conditions. The photolysis of acetamiprid in solution followed pseudo-first-order kinetics under the experimental conditions. Acetamiprid kept stable under irradiation of high-pressure xenon lamp but degraded relatively fast when exposure to medium-pressure mercury lamp irradiation. The experimental results indicated that the degradation rate of acetamiprid in acetone was the largest among the used media and acetamiprid was more stable in basic media. The addition of oxygen, increase of light intensity and temperature will enhance the photolysis.

Preparation of Ce Doped Pt/GAC Catalyst and Study on Its Catalytic Oxidation of Condensate Wastewater / 航天医学与医学工程

Objective To prepare the Pt/CeO2/GAC catalyst used to catalyze oxidation of condensate wastewater and to investigate whether the doping of Ce can increase catalytic activity for oxidizing condensate wastewater.Methods Impregnation glycol reduction method was adopted to prepare Pt/CeO2/GAC catalyst,and it was characterized by BET,XPS and XRD.The catalytic activity was determined by batch experiment.Results The experimental results revealed that more than 93.4% of ethanol in the condensate wastewater was oxidized to aldehyde and acetic acid with 13.33 g?L-1 Pt/CeO2/GAC catalyst dose,for 2 h reaction time,at 40 ℃ and normal pressure.In contrast,the oxidation efficiency was only 85.0% with Pt/GAC catalyst without doping Ce in the same reaction condition.Conclusion It is proven that the doping of Ce in Pt/GAC improves the catalytic activity.The characterization of Pt/CeO2/GAC catalyst shows that Ce is presented as Ce4+ that not only increases the content of chemisorbed oxygen on the surface of the catalyst,but also increases the content of Pt greatly.

Photocatalytic degradation of toluene using a novel flow reactor with Fe-doped TiO2 catalyst on porous nickel sheets.

A novel continuous-flow photocatalytic reactor was designed to decompose toluene by using porous nickel sheets that were coated with a Fe-doped TiO2 catalyst. While locating the UV lamp at the central axis, the catalyst sheets were located along the inner wall and positioned vertically with an equal space of 50 mm along the reactor. This geometry ensures better use of UV light, and a zigzag flow pattern of gas between the vertically located sheets provides for better mass transfer. The X-ray diffraction, scanning electron microscope and electric field-induced surface photovoltage spectra characterizations showed that Fe3+ ions were embedded effectively and distributed evenly throughout the TiO2 crystal lattice and an optimum molar ratio of Fe:Ti was 0.007. The reactor was used to investigate the factors that affect toluene degradation. The results showed that inlet toluene concentration, relative humidity and gas flow rate significantly affect toluene decomposition. The conversion decreases as inlet concentration increases. Degradation efficiencies of more than 95% can be achieved provided that the toluene concentration is kept below 3200 mg/m3. The conversion is affected little when oxygen content exceeds 21%. The optimal relative humidity is 25%. From the experimental data, a rate constant k of 131 mg/(m3.min) and Langmuir adsorption coefficient K of 0.0175 m3/mg were obtained.

Effect of multidisciplinary treatment on prolapse of lumbar intervertebral disc / 中国康复理论与实践

@#ObjectiveTo study the effect of different treatment on prolapse of lumbar intervertebral disc. Methods 169 patients with prolapse of lumbar intervertebral disc were divided into two groups, the contral group treated with traction and massage, and the comprehensive group treated with acupuncture, physical therapy, and phsiotherapy besides traction and massage. The assessment included index and rate in improvement and efficiency of rehabilitation. Results The index and rate in improvement and efficiency of rehabilitation is better in the comprehensive group than in the contral group. The course of treatment in the comprehensive group is shorter than that in the contral group.