PHOTODEGRADATION OF DIRECT YELLOW 50 DYE USING THE PHOTOCATALYST ZINC OXIDES UNDER ULTRA-VIOLET LIGHT

In this research photodegradation of direct yellow dye using zinc oxide as catalyst under ultra-violet light has been investigated. The concentration of photocatalyst has been found to be 0.003 M, while the results reveal that, the best H2O2 concentration can be used as 10 ml, furthermore, pH to run the reaction of photodegradation was observed at acidic media. It has been found that the direct yellow dye can be oxidized by positive hole or hydroxyl radical or reduced by electron in the conduction band, the cleavage of N=N leads to break down the dye.

Theoretical Analysis and Simulation on Seeds Throw Process of Seedling-Sowing Machine

For the technical problems that traditional Suction Plug Seedling -Sowing machine high positive hole rate which caused by the highly uneven rate of seeds " boiling ", and put forward the “boiling” way that the tray and seeds are throwing up boiling, innovative design of the thrown system which is compose of mechanical spring ,solenoid and suction cup , through to the theoretical analysis of the process of seeds thrown intrasystem,and established a mathematic model between seeds throw height and structural parameter, based on the SolidWorks software environment to build the multi-body system dynamics thrown model, to simulation and verification law of motion of tray and seeds intrasystem. The testing results show that the throw system can realize the "boiling" condition that seeds could adsorption, ensure that when the planter adsorbed seeds it could take a highly uniform on the thrown height, effectively reduce the positive hole rate, provides a new concept, structure and theory for design and research on the Suction Plug seedling-sowing machine seeds "boiling" system.

The Charge Transport Properties of a HWCVD a-Si:H Thin Film under Bending Pressure

The transient thermoelectric effects (TTEs) method is used to measure the ambipolar space charge built up in a low-pressure hot wire chemical vapor deposition (HWCVD) technique a-Si:H layer deposited on a glass substrate. The stage 2 TTE-transients yield the trap state density difference with and without bending pressure up to 9 bars. The a-Si:H sample shows a reduction of the negative storage peaks at 0.045 eV and 0.026 eV with increasing pressure, while the positive (hole trap) peak and the zero crossing practically do not change with the pressure. At the maximum bending pressure, the negative peaks are almost zero and shifted into the band gap or toward the conduction band. Our result shows that it is necessary to produce and mount hydrogenated thin film solar cell stress-free.

Mechanism of photocatalytic oxidation of gaseous ethanol

A photocatalytic film reactor with a titanium dioxide film was used for oxidation of gaseous ethanol at 253.7 nm. The influences of partial pressures of oxygen and water vapour in different carrier gases were studied. The rate of photocatalytic oxidation of ethanol was significantly affected by the content of oxygen but water vapour had no effect. It was suggested that the photocatalytic transformation of ethanol follows a direct oxidation mechanism where the interaction of ethanol with positive hole gives first cationic free radical of ethanol, which is converted by multipathway reactions with oxygen to acetaldehyde, ethyl formate, and ethyl acetate.