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Yuefa Jia,Chunli Liu,Rong Li 한국자기학회 2016 Journal of Magnetics Vol.21 No.1
Fe₂O₃/TiO₂ nanocomposite were successfully synthesized by co-precipitation method using Fe (NO₃)₃·9H₂O and Ti (SO₄)₂ as raw materials. Structural and textural features of the mixed oxide samples were characterized by X-ray diffractometer, field emission scanning electron microscopy and energy-dispersive X-ray. The effects of initial concentration of oxytetracycline (OTC), different competitive ions and organics on the photocatalytic degradation rate of OTC by the Fe₂O₃/TiO₂ nanocomposite were analyzed under UV and visible light irradiation. The results indicate that the optimized initial concentration of OTC was 50 ㎎/L to achieve the best photocatalytic efficiency. Cu<SUP>2+</SUP>, NH₄⁺, C₃H₈O and EDTA in the aqueous suspension were found to suppress the degradation rate of OTC, whereas the effect of NO₃⁻ and H₂C₂O₄ can be ignored.
Yuefa Jia,Jia Liu,차상원,최수빈,박윤창,Chunli Liu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Magnetically recyclable Au-TiO2/nanocube ZnFe2O4 (Au-TiO2/NC ZFO) composite photocatalysts have been successfully prepared by a hydrothermal method. It was revealed that Au-TiO2/NC ZFO composite with 25% mass percentage of Au-TiO2 exhibited a significantly enhanced photocatalytic efficiency toward chlortetracycline (CTC) degradation as compared to the binary TiO2/NC ZFO composite. The enhanced performance can be attributed to the addition of Au nanoparticles, which act as electron traps aiding the electron-hole separation and increasing the light absorption through the surface plasmon resonance effect. The synthesized catalyst showed good stability after three cycles and could be easily separated by a magnet and reused.
Jia, Yuefa,Rhee, S.J.,Liu, Chunli Elsevier 2017 Materials letters Vol.188 No.-
<P><B>Abstract</B></P> <P>Magnetic recoverable g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> photocatalysts were successfully prepared by a solvothermal method. X-ray diffraction patterns clearly indicated the coexistence of both g-C<SUB>3</SUB>N<SUB>4</SUB> and SnFe<SUB>2</SUB>O<SUB>4</SUB> in the composites. High-resolution scanning electron microscopy analysis revealed that 50nm-sized SnFe<SUB>2</SUB>O<SUB>4</SUB> particles were well anchored and distributed on the g-C<SUB>3</SUB>N<SUB>4</SUB> sheets. The g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> composite exhibited much enhanced photocatalytic property in degrading chlorotetracycline under visible light irradiation as compared to g-C<SUB>3</SUB>N<SUB>4</SUB> or SnFe<SUB>2</SUB>O<SUB>4</SUB> only. The g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> composite photocatalyst could be easily separated from the solution by a lab magnet, and the reactivity did not show significant degradation even after being used for three cycles. The possible reaction mechanism was proposed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Magnetic recoverable g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> is prepared by a solvothermal method. </LI> <LI> The g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> shows enhanced photocatalytic activity for chlorotetracycline. </LI> <LI> The g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> has a larger rate constant than those of g-C<SUB>3</SUB>N<SUB>4</SUB> and SnFe<SUB>2</SUB>O<SUB>4</SUB>. </LI> <LI> The photocatalytic mechanism of g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> was investigated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Highly active, stable, and recoverable g-C<SUB>3</SUB>N<SUB>4</SUB>/SnFe<SUB>2</SUB>O<SUB>4</SUB> photocatalyst was prepared by a solvothermal method.</P> <P>[DISPLAY OMISSION]</P>
Jia, Yuefa,Lee, B. W.,Liu, Chunli IEEE 2017 IEEE transactions on magnetics Vol.53 No.3
<P>ZnFe2O4 nanocubes with high magnetization were prepared by a hydrothermal method. The structural, optical, morphology, and magnetic properties were investigated. The as-prepared sample exhibited a uniform cubic morphology with a high-saturation magnetization of 94.6 emu/g, therefore, can be easily collected from an aqueous solution using a magnet. Further investigation on the photocatalytic degradation of chlorotetracycline (CTC) using ZnFe2O4 nanocubes revealed a good photodegradation performance in a visible light/H2O2 system. The degradation efficiency of the ZnFe2O4 nanocubes on CTC remains above 45% even after three recycling circles. Therefore, the hydrothermally prepared ZnFe2O4 nanocubes can be considered as a promising magnetically retrievable photocatalyst under visible light irradiation.</P>
Jia, Yuefa,Ma, Haoxuan,Liu, Chunli Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.463 No.-
<P><B>Abstract</B></P> <P>A novel Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> photocatalytic composite with high, stable, and remarkable visible light activity was prepared via a sol-gel and hydrothermal route. Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> composite show improved properties in BET, UV–vis DRS, and PL characterization as compared to Au-CoFe<SUB>2</SUB>O<SUB>4</SUB> or CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB>. The photocatalytic performance was investigated by the degradation of methyl orange (MO) in aqueous suspension under visible light irradiation. As compared to CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB>, the degradation efficiency of MO was improved by nearly 60% in the Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> composite, which can be attributed to the better electron hole separation over the interface through Au nanoparticles. The existence of Au nanoparticles at the interface between CoFe<SUB>2</SUB>O<SUB>4</SUB> and MoS<SUB>2</SUB> provided a preferred route for the Z-scheme transfer of the charge carriers. Due to the room temperature magnetization of CoFe<SUB>2</SUB>O<SUB>4</SUB>, the photocatalyst composite can be recycled easily and showed very stable efficiency in degradation of MO. The investigation of the degradation mechanism revealed that <SUP> </SUP>O<SUB>2</SUB> <SUP>−</SUP> radicals played the most important role in the photocatalytic reaction, which supported the Z-scheme transfer in the Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> composite.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new type ternary Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> Z scheme photocatalyst. </LI> <LI> The function of Au in the interphase between CoFe<SUB>2</SUB>O<SUB>4</SUB> and MoS<SUB>2</SUB> was investigated. </LI> <LI> Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> shows superior photocatalytic activity. </LI> <LI> Methyl orange can be removed by Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> under visible light irradiation. </LI> <LI> Cycle degradation tests show the catalyst was highly active, stable and recoverable. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Magnetic separable Au-CoFe<SUB>2</SUB>O<SUB>4</SUB>/MoS<SUB>2</SUB> photocatalyst exhibits an outstanding photocatalytic activity in degradation of methyl orange (MO) under visible light irradiation, due to the much-improved interface conductivity and charge separation capability.</P> <P>[DISPLAY OMISSION]</P>