Guo De Li

Influence of Heat-Treatment on High-Phosphorus Ni–P Plating Coating

The high-phosphorus electroless Ni–P plating coating with 11.64 at.% was prepared by electroless technology. By means of x-ray diffraction and scanning electron microscopy, the morphologies and phase structures of coating were analyzed. Furthermore, the mechanical properties of coating were studied by micro-hardness tester and universal friction-wear testing machine. The results reveal that, with increasing heat-treatment temperatures, the hardness and the wear resistance of the coating are enhanced increasingly. Treated by 1 hour at 500 oC, the hardness and the wear resistance both display a optimum value, i.e. 1004 HV and 1.5×10-3g, respectively. The thermal shock test suggests that between coating and matrix exist a perfect cohesion.

Application of ICP-AES to the Detection of Heavy Metals in Cordyceps militaris from Shenyang

The microwave digestion-ICP-AES was used to detect the Cr, Cd, Pb, As, Hg and Ni in cordycepsmilitaris from Shenyang. The method accuracy was proved by the national standard method. The result shows the sequence of heavy metals was Pb>Ni >As > Cd> Cr, and Hg was not detected, as was detected in few sample. All the data showed that cordycepsmilitaris accords with the national standards. The method average recovery is 94.07%-107.58%, and RSD is 0.84%-3.25%. It is a promising analysis method on detection of heavy metals in cordycepsmilitaris.

Advances in Research of Botanical Insecticide

Botanical insecticides have advantages of wide range of sources, easily made with local materials, low-cost, cost savings, useful and safe to people, animals and crops, etc. The compound of botanical insecticide is an effective way to improve the efficacy of such pesticides. With the development of green agriculture, it will gain more and more attention.

Detection and Evaluation of Heavy Metal in Edible Fungi of Liaoning Province

Adopting microwave digestion and ICP-AES method while detecting Ni, Cr, Pb, Cd, As and Hg in edible fungus of Liaoning province, results show that the acceptance rate of heavy metal in lentinus edodes, oyster mushrooms, pleurotus eryngium, agrocybe cylindracea, agaricus bisporus, black fungus, coprinus comatus, cordyceps militaris was above 90%, Hg was not checked out, only in exceptional sampals Pb, Cd, Cr have checked out but not exceed, Ni and As out of limits, but the superscale was very small, the lentinus edodes in Liaoning province in a great measrue was safty.

Treatment of Chlorobenzene Containing Wastewater by Titanium Oxide Photocatalyst

In this study, we choose TiO2 as photocatalysis, and to deal with low concentration chlorobenzene-containing wastewater under the shining of ultraviolet light. Temperature, pH and flux have be inspected. The following conclusion is according to the experiment result: When chlorobenzenes concentration deciding for 50mg/L and TiO2s concentration is 1.0g/L , it is better to get the optimum parameter: temperature is 60°C, flux is 100L/h and in acidic condition.

Effect of Prepareing Conditions on the Tensile Strength of Bamboo Carbon-Polyvinyl Formal Biological Carrier

In this experiment the tensile strength of bamboo carbon- polyvinyl formal biological carrier (BCPFBC) were tested. The optimal parameters are as follow: 6ml of sulfuric acid, 4ml of formaldehyde, 2g of bamboo carbon dosage, 40°C of reaction temperature, and 2.1N.mm-2 of BCPFBC tensile strength.

Methyl Violet Degradation by Bamboo Charcoal/Microwave Method

In the paper methyl violet degradation by bamboo charcoal-microwave irradiation method was researched. The main parameters which were studied including the amount of bamboo charcoal, H2O2 dosage, FeSO4·7H2O dosage and time of microwave irradiation were investigated. The UV-visible spectra of methyl violet were determined. The results show that: under bamboo charcoal, H2O2 and FeSO4·7H2O microwave condition the degeneration rate of methyl violet was almost 100%. The increase of bamboo charcoal dosage can accelerate the reaction process, speeding up the degradation of methyl violet. The increase of H2O2 may provide more ·OH and speed up the reaction process, but when up to a certain amount, the influence is weakened. The lengthening of microwave time may enhance the reaction temperature, and urge the methyl violet to degrade completely. For 0.2 g·L-1 methyl violet 4:9 diluted, by adding 0.5g bamboo charcoal, 1 mL 36% H2O2, 1 mL FeSO4·7H2O of 1mol·L-1 and under mesotherm microwave for 30s, the methyl violet can be all degradated.

Effect of the Grain Size on Electrochemical Corrosion Behavior of Cu60Ni20Cr20 Alloys in Solutions Containing Chloride Ions

The two Cu60Ni20Cr20 alloys with the different grain size were prepared by conventional casting (CA) and mechanical alloying (MA) through hot pressing. Effect of the grain size on electrochemical corrosion behavior of the two Cu60Ni20Cr20 alloys was also studied in solutions containing chloride ions. Results show that the free corrosion potentials of the two alloys move toward to negative values, corrosion current densities increase and therefore corrosion rates become faster with the increment of chloride ion concentrations. CACu60Ni20Cr20 alloy and MACu60Ni20Cr20 alloy have passive phenomena in 0.05mol/L Na2SO4 neutral solution, but passive phenomena become weak or disappear when the chloride ions are added. Corrosion rates of the nanocrystalline MACu60Ni20Cr20 alloy become slower than those of the coarse grained CACu60Ni20Cr20 alloy in solutions containing the same chloride ion concentrations because MACu60Ni20Cr20 alloy is able to produce large concentrations of grain boundaries and passive elements is able to diffuse quickly to form the protective film.

Study on Oil Refining Wastewater Treatment by Membrane Bioreactor with A/O Process

In this experimentation an A/O submerged membrane bioreactor was designed to study the treatment of oil-refining wastewater. The result show that the average effluent COD was below 18 mg/L, the removal rate of COD was over 97% and the removal rate was stable; the removal rate of NH4+-N was influenced by PH value, the average effluent NH4+-N was less than 0.97 mg/L and the average removal rate was over 98%; the average effluent oil was below 5mg/L and removal rate was over 96%; effluent phenol was less than 0.12mg/L and the removal rate was nearly 100%.

Preparation of Bamboo Charcoal/Polyvinyl Formal Foam as Biological Support Material

Biological material was prepared by adhering different amount of bamboo charcoal filler into the matrix of polyvinyl formal foam by manual controlled foaming process. The material bears properties of low density, high strength, and good adsorption ability from the advantage of polyvinyl formal. It can be used as new efficient biological supporting material in sewage disposal system. The effects of hydrochloric acid, formaldehyde, bamboo charcoal, and temperature on the preparation were investigated.