Decoloration and mineralization of yeast wastewater were investigated by using Ce-Fe/Al2O3 as a heterogeneous photo-Fenton catalyst in fluidized bed reactor in order to solve the problem of yeast wastewater discharge....Decoloration and mineralization of yeast wastewater were investigated by using Ce-Fe/Al2O3 as a heterogeneous photo-Fenton catalyst in fluidized bed reactor in order to solve the problem of yeast wastewater discharge. The experimental results were assessed in terms of total organic carbon（TOC） reduction. The operational and reaction conditions affecting the efficiencies of TOC removal such as initial pH value, H2O2 concentration, catalyst loading and UV power were studied. The results show that TOC is reduced from 347.6 mg/L to 10.8 mg/L, color is changed from 500 units to 0 under the conditions as follows： initial pH value 6. 0, H2O2 concentration of 1. 000 g/L, catalyst loading of 5 g/L, reaction duration of 120 rain and reaction temperature of 30 ℃. The irradiated Ce-Fe/Al2O3 catalyst was complexed with 1,10-phenanthroline and then it was subjected to Fourier transform infrared spectroscopy and diffuse reflectance spectroscopy to confirm the formation of Fe（Ⅱ） in the solid state. Heterogeneous photo-Fenton reaction proves to be effective for the treatment of yeast wastewater.展开更多
采用熔体快淬技术制备了[(Nd_(0.76)Pr_(0.24))_(1-x)Ce_(x)]_(12)Fe_(79)Al_(3)B_(6)(x=0~0.3)系列快淬薄带,对其微观结构和磁性能进行了研究。实验表明,随着Ce含量增加快淬带磁性能整体呈下降趋势,x=0.2时其磁性能出现反常增大,此时H_...采用熔体快淬技术制备了[(Nd_(0.76)Pr_(0.24))_(1-x)Ce_(x)]_(12)Fe_(79)Al_(3)B_(6)(x=0~0.3)系列快淬薄带,对其微观结构和磁性能进行了研究。实验表明,随着Ce含量增加快淬带磁性能整体呈下降趋势,x=0.2时其磁性能出现反常增大,此时H_(cj)=8.38 k Oe,Br=8.68 k Gs,(BH)_(max)=14.42 MGOe。HRTEM/EDS分析发现,x=0.2的快淬带平均晶粒尺寸在所有快淬带中最为细小均匀,约为28 nm,且其2:14:1相晶粒存在较高的成分波动,表明出现了相分离。δM(H)曲线分析发现,x=0.2快淬带晶粒间交换耦合作用出现反常增大。晶粒细化和相分离是x=0.2快淬带磁性能反常增大的主要原因。展开更多
The Ce-Fe-O mixed oxide with a ratio of Ce/Fe=7:3, which was prepared by coprecipitation method and employed as oxygen carrier, for direct partial oxidation of methane to syngas in the absence of gaseous oxygen was ex...The Ce-Fe-O mixed oxide with a ratio of Ce/Fe=7:3, which was prepared by coprecipitation method and employed as oxygen carrier, for direct partial oxidation of methane to syngas in the absence of gaseous oxygen was explored. The mixed oxide was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), and the catalytic performances were studied in a fixed-bed quartz reactor and a thermogravimetric reactor, respectively. Approximately 99.4% H2 se...展开更多
基金Project(20277010) supported by the National Natural Science Foundation of China
文摘Decoloration and mineralization of yeast wastewater were investigated by using Ce-Fe/Al2O3 as a heterogeneous photo-Fenton catalyst in fluidized bed reactor in order to solve the problem of yeast wastewater discharge. The experimental results were assessed in terms of total organic carbon（TOC） reduction. The operational and reaction conditions affecting the efficiencies of TOC removal such as initial pH value, H2O2 concentration, catalyst loading and UV power were studied. The results show that TOC is reduced from 347.6 mg/L to 10.8 mg/L, color is changed from 500 units to 0 under the conditions as follows： initial pH value 6. 0, H2O2 concentration of 1. 000 g/L, catalyst loading of 5 g/L, reaction duration of 120 rain and reaction temperature of 30 ℃. The irradiated Ce-Fe/Al2O3 catalyst was complexed with 1,10-phenanthroline and then it was subjected to Fourier transform infrared spectroscopy and diffuse reflectance spectroscopy to confirm the formation of Fe（Ⅱ） in the solid state. Heterogeneous photo-Fenton reaction proves to be effective for the treatment of yeast wastewater.
文摘采用熔体快淬技术制备了[(Nd_(0.76)Pr_(0.24))_(1-x)Ce_(x)]_(12)Fe_(79)Al_(3)B_(6)(x=0~0.3)系列快淬薄带,对其微观结构和磁性能进行了研究。实验表明,随着Ce含量增加快淬带磁性能整体呈下降趋势,x=0.2时其磁性能出现反常增大,此时H_(cj)=8.38 k Oe,Br=8.68 k Gs,(BH)_(max)=14.42 MGOe。HRTEM/EDS分析发现,x=0.2的快淬带平均晶粒尺寸在所有快淬带中最为细小均匀,约为28 nm,且其2:14:1相晶粒存在较高的成分波动,表明出现了相分离。δM(H)曲线分析发现,x=0.2快淬带晶粒间交换耦合作用出现反常增大。晶粒细化和相分离是x=0.2快淬带磁性能反常增大的主要原因。
基金Project supported by the National Natural Science Foundation of China (50574046, 50774038)the Research Fund for the Doctoral Program of Higher Education of China (20095314120005)+1 种基金the Natural Science Foundation of Yunnan Province (2008E030M) the Foundation of Kun-ming University of Science and Technology (KKZ3200927010)
文摘The Ce-Fe-O mixed oxide with a ratio of Ce/Fe=7:3, which was prepared by coprecipitation method and employed as oxygen carrier, for direct partial oxidation of methane to syngas in the absence of gaseous oxygen was explored. The mixed oxide was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), and the catalytic performances were studied in a fixed-bed quartz reactor and a thermogravimetric reactor, respectively. Approximately 99.4% H2 se...
