Forming adsorbents FFA-R,FFA-A and FFA-B were prepared from different particle size coal fly ashes FA-R,FA-A and FA-B,their average particle sizes（d_（50）） were 15.75,3.61 and 1.73 μm respectively.The structure an...Forming adsorbents FFA-R,FFA-A and FFA-B were prepared from different particle size coal fly ashes FA-R,FA-A and FA-B,their average particle sizes（d_（50）） were 15.75,3.61 and 1.73 μm respectively.The structure and adsorption properties for Cr^（6＋） of forming adsorbents from aqueous solution were studied.The results show that forming adsorbent prepared from the coal fly ash with smaller particle size exhibits higher specific surface area,higher pore volume and better adsorption properties for Cr^（6＋）.The adsorption kinetics of Cr^（6＋） on FFA-R,FFA-A and FFA-B fitts the second order kinetic model and the second adsorption rate constants are 7.523,3.197 and 2.187 mg·g^（-1）·min^（-1/2）,respectively.The adsorption of Cr^（6＋） on FFA-R,FFA-A and FFA-B can be described in terms of Langmuir isotherms better,and the adsorption processes are spontaneous and exothermic.展开更多
Porous ZnO hollow microspheres were successfully deposited on ceramic base by chemical deposition method.The phase and micro-nano structure of the obtained ZnO powers were characterized by X-ray diffraction,scanning e...Porous ZnO hollow microspheres were successfully deposited on ceramic base by chemical deposition method.The phase and micro-nano structure of the obtained ZnO powers were characterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.Photocatalytic property,Cr^(6+)adsorption performance and reuseableability of porous ZnO hollow microspheres on ceramic base were measured in detail.The results showed that the photocatalytic degradation rate of the obtained samples to rhodamine B solution could reach 96.30%after 5 h UV irradiation and its Cr^(6+)_adsorption capacity was 88.37 mg/g after 24 h.Besides,the obtained ZnO also have excellent reusability,the degradation rate for rhodamine B solution could still reach 94.49%and Cr^(6+) adsorption capacity was66 mg/g after used 3 times.The above application results further demonstrated that the obtained products are expected to find wide applications in treating tannery wastewater.展开更多
基金Funded by the National Natural Science Foundation of China(No.51278418)the Natural Science Basic Research Plan in Shaanxi Province of China(No.2013K11-10)the Key Laboratory of Environmental Protection&Pollution and Remediation of Water and Soil of Shaanxi Province(Chang’an University)
文摘Forming adsorbents FFA-R,FFA-A and FFA-B were prepared from different particle size coal fly ashes FA-R,FA-A and FA-B,their average particle sizes（d_（50）） were 15.75,3.61 and 1.73 μm respectively.The structure and adsorption properties for Cr^（6＋） of forming adsorbents from aqueous solution were studied.The results show that forming adsorbent prepared from the coal fly ash with smaller particle size exhibits higher specific surface area,higher pore volume and better adsorption properties for Cr^（6＋）.The adsorption kinetics of Cr^（6＋） on FFA-R,FFA-A and FFA-B fitts the second order kinetic model and the second adsorption rate constants are 7.523,3.197 and 2.187 mg·g^（-1）·min^（-1/2）,respectively.The adsorption of Cr^（6＋） on FFA-R,FFA-A and FFA-B can be described in terms of Langmuir isotherms better,and the adsorption processes are spontaneous and exothermic.
基金supported by Science and Technology Project of Xi'an City(CXY1430(1))Scientific Research Fund Project of Shaanxi University of Science and Technology(BJ13-23)Scientific Research Innovation Group of Shaanxi University of Science and Technology(TD12-03)
文摘Porous ZnO hollow microspheres were successfully deposited on ceramic base by chemical deposition method.The phase and micro-nano structure of the obtained ZnO powers were characterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.Photocatalytic property,Cr^(6+)adsorption performance and reuseableability of porous ZnO hollow microspheres on ceramic base were measured in detail.The results showed that the photocatalytic degradation rate of the obtained samples to rhodamine B solution could reach 96.30%after 5 h UV irradiation and its Cr^(6+)_adsorption capacity was 88.37 mg/g after 24 h.Besides,the obtained ZnO also have excellent reusability,the degradation rate for rhodamine B solution could still reach 94.49%and Cr^(6+) adsorption capacity was66 mg/g after used 3 times.The above application results further demonstrated that the obtained products are expected to find wide applications in treating tannery wastewater.
