Equilibrium and kinetic studies have been made on the adsorption of acrylonitrile(CH2= CHCN) on three soils and four minerals from aqueous solutions. It was shown that the organic matter was the major factor affecting...Equilibrium and kinetic studies have been made on the adsorption of acrylonitrile(CH2= CHCN) on three soils and four minerals from aqueous solutions. It was shown that the organic matter was the major factor affecting the adsorption process in the soils. The conformity of the equilibrium data to linear type(one soil) and Langmuir type(two soils) isotherms indicated that different mechanisms were involved in the adsorption. This behavior appears to be related to the hydrophobicity of soil organic matter due to their composition and E4/ E6 ratio of humic acids. The adsorption kinetics were also different among the soils, indicating the difference in porosity of organic matter among the soils, and the kinetics strongly affected the adsorption capacity of soils for acrylonitrile.Acrylonitrile was slightly adsorbed from aqueous solutions on pyrophyllite with electrically neutral and hydrophobic nature, and practically not on montmorillonite and kaolinite saturated with Ca. However, much higher adsorption occurred on the zeolitized coal ash, probably caused by high organic carbon content(1 07g/ kg).展开更多
Carbon films prepared from pyrolyzation of spin-casted polyacrylonitrile （PAN） thin films display high electrical conductivity （〉600 S/cm, at 1000 ℃ carbonization）, low sheet resistance （about 100 Y2/square at ...Carbon films prepared from pyrolyzation of spin-casted polyacrylonitrile （PAN） thin films display high electrical conductivity （〉600 S/cm, at 1000 ℃ carbonization）, low sheet resistance （about 100 Y2/square at the PAN film thickness of 70 nm） and partial transmittance. These pyrolyzed PAN （PPAN） films were patterned as bottom electrodes by photolithography, and utilized as drain and source electrodes to fabricate organic field-effect transistor （OFET） devices with a p-type semiconductor （P3HT） and an n-type semiconductor （DPP-containing quinoidal small molecule） through a spin-coating procedure. The results showed that the devices with the PAN electrodes exhibited almost the same excellent performance without any further modification compared to those devices with traditional Au electrodes. Since these PPAN films had the advantages of low-cost, high performance, easier for large-area fabrication, thermal and chemical stability, it should be a promising electrode material for organic electrodes.展开更多
文摘Equilibrium and kinetic studies have been made on the adsorption of acrylonitrile(CH2= CHCN) on three soils and four minerals from aqueous solutions. It was shown that the organic matter was the major factor affecting the adsorption process in the soils. The conformity of the equilibrium data to linear type(one soil) and Langmuir type(two soils) isotherms indicated that different mechanisms were involved in the adsorption. This behavior appears to be related to the hydrophobicity of soil organic matter due to their composition and E4/ E6 ratio of humic acids. The adsorption kinetics were also different among the soils, indicating the difference in porosity of organic matter among the soils, and the kinetics strongly affected the adsorption capacity of soils for acrylonitrile.Acrylonitrile was slightly adsorbed from aqueous solutions on pyrophyllite with electrically neutral and hydrophobic nature, and practically not on montmorillonite and kaolinite saturated with Ca. However, much higher adsorption occurred on the zeolitized coal ash, probably caused by high organic carbon content(1 07g/ kg).
基金supported by the Chinese Ministryof Science and Technology (2013CB632506, 2011CB932304)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB12000000)the National Natural Science Foundation of China(21290191, 21333011)
文摘Carbon films prepared from pyrolyzation of spin-casted polyacrylonitrile （PAN） thin films display high electrical conductivity （〉600 S/cm, at 1000 ℃ carbonization）, low sheet resistance （about 100 Y2/square at the PAN film thickness of 70 nm） and partial transmittance. These pyrolyzed PAN （PPAN） films were patterned as bottom electrodes by photolithography, and utilized as drain and source electrodes to fabricate organic field-effect transistor （OFET） devices with a p-type semiconductor （P3HT） and an n-type semiconductor （DPP-containing quinoidal small molecule） through a spin-coating procedure. The results showed that the devices with the PAN electrodes exhibited almost the same excellent performance without any further modification compared to those devices with traditional Au electrodes. Since these PPAN films had the advantages of low-cost, high performance, easier for large-area fabrication, thermal and chemical stability, it should be a promising electrode material for organic electrodes.
