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为了确定石油降解菌对石油污染物的生物降解特性,选用分离得到的一株石油降解菌假单胞菌SY5,对其降解石油污染物的动力学特性进行了研究.研究结果表明,在30℃,pH=7.2的反应条件下,所筛选的SY5菌对石油具有良好的降解能力,降解石油的反应基本符合一级反应动力学,且随石油初始浓度的增大,SY5降解石油的速率减小,降解受到抑制.在生物降解的过程中,SY5的生长曲线具有明显增长和衰减曲线.在生长阶段,产率系数Y值为0.3873.在内源呼吸阶段,衰减系数bd值为0.1805d^-1,SY5菌自身氧化速度比较快.SY5生物降解石油Monod方程的最大比增长速率胁,和半饱和常数Ks分别为1.6d^-1和150mg/L. 相似文献
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包覆型Fe2O3/SiO2颜料由于包覆完整性并不理想,该颜料高于800 ℃时呈色会产生变黑、变暗的问题。采用溶胶-凝胶法制备包覆型Fe2O3/SiO2颜料,研究催化剂浓度、反应温度、硅/铁质量比等因素对包覆型Fe2O3/SiO2颜料呈色性能的影响。在此基础上,通过掺加Zn2+,进行了Zn2+掺加的包覆型Fe2O3/SiO2颜料的呈色性能研究。研究表明,当催化剂(氨水)浓度为0.75 mol/L,反应温度为40 ℃,硅/铁质量比m(SiO2)/m(Fe2O3)为0.20,铁/锌摩尔比n(Fe)/n(Zn)为4时,制备得到的Zn2+掺加的包覆型Fe2O3/SiO2颜料的呈色耐热性能获得明显提升,样品在850 ℃煅烧后仍然呈现出明亮的红橙色色调。 相似文献
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Au nanoparticles coated on the surface of glass (Sample A) or on anodic aluminum oxide template surface (Sample B) were prepared using titanium dioxide sol-gel doped with chloroauric acid and with a reduction process. FE-SEM, UV-Vis spectrum and Fluorescence spectrum tests show that Au nanoparticles have been distributed randomly on the surface of glass, while deposition occurs on the surface of regular hollows for anodic aluminum oxide template. A sharp absorption peak appears at the wavelength of 536 nm for sample B, while there is a red shift, with a broader peak for sample A. A distinct fluorescence emission at the wavelength of 633 nm is detected for sample A, but no noticeable fluorescence emission has been found for Sample B. The results indicate that the microstructure and optical properties of Au nanoparticles can be modulated by different substrate. 相似文献