【摘 要】
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Employing zinc sulfate solution obtained from zinc oxide ore as raw material,sodium hydroxide as precip-itant and PEG20000 as dispersant,ultrafine ZnO powders w
【机 构】
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School of Metallurgy,Northeastern University,Shenyang 110819,China;Liaoning Key Laboratory for Metal
论文部分内容阅读
Employing zinc sulfate solution obtained from zinc oxide ore as raw material,sodium hydroxide as precip-itant and PEG20000 as dispersant,ultrafine ZnO powders with different morphologies were successfully synthesized through hydrothermal method.The influences of the dosage of PEG20000 solution,molar ratio of OH-/Zn2+,reaction temperature,reaction time and Zn2+ concentration on the structures and morphologies of the ZnO powders were discussed in detail.The reaction conditions of synthesizing ZnO powders with flower-like structure were obtained as below:dosage of PEG20000 with 10％ mass fraction 5 mL,molar ratio of OH-to Zn2+ 5,reaction temperature 150 ℃,reaction time 8 h at Zn2+ concentration 1 mol L-1.The growth mechanism of ZnO particles with different morphologies was proposed.The ZnO powder with flower-like structure are composed of multiple micro-rods with hexagon morphology and has good photocatalytic degradation ability to degrade RhB.20 mL RhB solution with 15 mg L-1 could be completely degraded over flower-like ZnO powder 300 mg within 3 h.
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