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以过渡金属盐Co(NO3)2、Mn(NO3)2为钴源、锰源,Al(NO3)3为铝源,NaOH和Na2CO3混合溶液为碱性介质,利用共沉淀法分别制备了n(Co)∶n(Mn)∶n(Al)=4∶0∶2、4∶1∶1、4∶2∶0的CO32-离子插层纳米层状双金属氢氧化物(LDHs)。利用X射线衍射(XRD)、X射线荧光光谱分析(XRF)、N2吸附脱附、透射电镜(TEM)技术对样品进行了表征。结果表明,样品呈层状片状,随着LDHs样品中Mn、Al原子比的增加,结晶度变差,形貌变得无序,平均孔径减小,比表面积和孔道容量变大。 相似文献
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采用共沉淀法制备了n(Co)∶n(Mn)∶n(Al)=4∶0∶2、4∶1∶1、4∶2∶0的CO32-离子插层层状双金属氢氧化物(LDHs),经500℃煅烧4h得到相应的Co-Mn-Al复合过渡金属氧化物。利用X射线衍射(XRD)、X射线荧光光谱分析(XRF)、N2吸附脱附、透射电镜(TEM)技术对样品进行了表征。研究结果表明,Co-Mn-Al复合氧化物具有含Co尖晶石氧化物的结构特征,属于中孔材料,与Co-Mn-Al LDHs相比,其比表面积增大,孔容增加,孔径尺寸变小,且随着Mn与Al原子比的增加,样品结晶度及有序性均下降。 相似文献
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Catalytic ozonation with coal-based activated carbon ( carbozone) followed by GAC ( granular activated carbon) filtration was compared with ozone-GAC process for water purification. Songhua River water pretreated with traditional processes was used as influent in the continuous-flow experiments. The carbozone-GAC process performed better than the ozone-GAC process during the 9. 5-months operation period. The organic removal rate in carbozone was found to be very high in the initial operation period,and then gradually decreased to a steady level. At the steady state of operation,the average removal rates of permanganate index ( PI) and UV254 were 25. 8% and 67. 8% in carbozone,and 6. 6% and 53. 7% in ozonation alone,respectively. The carbozone process also achieved a higher DOC removal than ozonation alone,and moreover,the number of semi-volatile organic compounds detected with GC/MS decreased from 44 to 28 in carbozone and 34 in ozonation alone,respectively. The catalyst surface became more acidic during the long-term operation with its pHPZC( pH at which its surface is zero charged) decreased from 7. 0 to 6. 2. In addition,the physical characteristics of the catalyst were also changed during the operation. 相似文献
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在低温低浊条件下,通过对生物强化炭砂滤池(BCSFR)与普通炭砂滤池(CSFR)进行对比实验,研究有机物及消毒副产物的去除效果及机制。结果表明,在原水温度4~10°C,浊度为2~6NTU条件下,BCSFR对高锰酸盐指数(PI)、TOC和UV254的平均去除率分别达到48.28%、31.80%和29.32%。此外,可生物同化有机碳(AOC)和可生物降解有机碳(BDOC)的去除率分别为50.83%和51.16%。由于微生物降解与活性炭吸附的协同作用,BCSFR能够比普通CSFR更有效去除有机物,因此有可能成为一种适合处理寒冷地区低温低浊水的安全饮用水保障技术。 相似文献
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