Wastewater treatment using Fe-doped perovskite manganites by photocatalytic degradation of methyl orange,crystal violet and indigo carmine dyes in tungsten bulb/sunlight  

作　　者：Brajendra Singh Priyanka Singh Saiqua Siddiqui Divyanshu Singh Mukul Gupta 

机构地区：[1]Materials Chemistry Lab,Centre of Material Sciences,University of Allahabad,Prayagraj,21002,India [2]UGC-DAE Consortium for Scientific Research,University Campus,Khandwa Road Indore,452001,India

出　　处：《Journal of Rare Earths》2023年第9期1311-1322,I0002,共13页稀土学报（英文版）

基　　金：the UGC-DAE-Consortium for Scientific Research (CSR),Indore Centre for providing financial support under the CRS project scheme fordoing SXAS experiments and P.Singh for project fellowship。

摘　　要：We documented(ⅰ) the decolorization of wastewater in visible light,which contains methyl orange,crystal violet and indigo carmine dyes,using La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1 and 0.5) manganites and(ⅱ) efficient separation of photocatalysts from water using magnetic field.These ceramic photocatalysts were sintered at 1050℃ for 12 h.Ceramics were characterized by X-ray diffraction(XRD),soft X-ray absorption spectroscopy(SXAS),Fourier transform infrared spectroscopy(FTIR) and UV-visible diffuse reflectance spectroscopy(DRS).SXAS studies show the presence of Mn(Mn^(3+)/Mn^(4+)) and Fe(Fe^(3+)/Fe^(4+)) mixes valences in Fe-doped compositions.Optical band gap is found in visible light range for La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1) compositions.La_(0.7)Sr_(0.3)MnO_(3) degrades 94.6% methyl orange in7 min,81.9% crystal violet in 10 min and 99.1% indigo carmine in 5 min.La_(0.7)Sr_(0.3)Mn_(0.9)Fe_(0.1)O_(3) degrades the 92.6% methyl orange dye solution in 9 min,94.8% crystal violet in 25 min and 97.1% indigo carmine in3 min.Parent and Fe doped manganites can be separated in 60 s from wastewater.

关 键 词：Synchrotron X-ray absorption Dye degradation Magnetic separation Mixed valences Rare earths Wastewater treatment 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]