Fabrication of Fe-Ni nanoparticles and CNTs supported onto Al2O3 powders for environmental applications

• Main Authors: Shu-Huei Hsieh, 謝淑惠
• Other Authors: Jao-Jia Horng
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/36562927316835356798

博士 === 國立雲林科技大學 === 工程科技研究所博士班 === 94 === Nanoscale iron particles represent a promising new remediation tool that could degrade chlorinated organic compounds in ground water or soil by direct injecting method. A core-shell structure of nanoscale bimetallic (Pd/Fe, Ni/Fe) particles was developed by chemical reduction and precipitation and could improve the degradation of chlorinated organic compounds. In actual applications, the oxidation and clustering of these nano-scaled Fe and Ni particles might be problematic due to (1) the need for vacuum (or nitrogen gas) protection, (2) the separation for clusters and (3) the impact of engineered nanomaterials on the environmental. In this study, electroless plating technique was successfully used to fabricate nanoparticles onto the surface of submicron powders. Then, the composite Fe-Ni nanoparticles/ Al2O3 was produced by electroless Fe-Ni plating, parameters of plating were studied, and Fe-Ni nanoparticles were used as catalyst to grow Carbon nanotubes (CNT) onto Al2O3 powders. The composite powders, Fe-Ni/Al2O3 and CNT/Fe-Ni/ Al2O3 have the properties of nano materials and size of submicron simultaneously, to be new materials with potential for environmental application. The experimental results are evaluated as following: 1. Composite Fe-Ni nanoparticles / Al2O3 powders (1) Fe-Ni nanoparticles could be deposited onto Al2O3 powders by electroless Fe-Ni plating. (2) Fe-Ni nanoparticles were dispersively deposited onto the surface of Al2O3. (3) After ultrasonic vibrating process, Fe-Ni nanoparticles did not lose from Al2O3. (4) Fe-Ni nanoparticles consist of Fe, Ni, and [Fe Ni] alloy phases. (5) Composite Fe-Ni nanoparticles / Al2O3 powders could effectively decompose chloroform from aqueous solution with dissolved oxygen. (6) Composite Fe-Ni nanoparticles / Al2O3 powders were saved in dryer for one year, and then effectively decompose trichloroethylene from aqueous solution with dissolved oxygen too. 2. Composite CNT/ Fe-Ni / Al2O3 powders (1) CNTs could be grown onto Al2O3 powders by using Fe-Ni nanopartciles as catalyst. (2) CNT still can adhered onto Fe-Ni / Al2O3 powders even after washing with ultrasonic vibration in acid or basic solution. (3) CNTs with multi-walls are curved, and tangled with each others and fully cover the surface of Al2O3 powders. (4) As-grown CNT/Fe-Ni/Al2O3 powders could effectively adsorbed heavy metal Pb, Cu and Cd from aqueous solution. (5) The adsorption capacities of as-grown CNT/ Fe-Ni / Al2O3 for Pb+2, Cu+2 and Cd are better than commercial CNTs without treatment. Keyword: Fe-Ni nano-particle, carbon nanotubes, Al2O3 powders composite powder, electroless Fe-Ni deposition, dechlorination of CF and TCE, adsorption of metal ions.