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Reddy, Chandragiri Venkata,Reddy, I. Neelakanta,Shim, Jaesool,Kim, Dongseob,Yoo, Kisoo Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.11
<P><B>Abstract</B></P> <P>Template-free undoped and yttrium-doped tetragonal ZrO<SUB>2</SUB> nanoparticles were successfully synthesized using a hydrothermal technique, and their structural, morphological, optical, and electrochemical properties were characterized. The photocatalytic activity for the dye degradation of the Rhodamine B (RhB) was also studied under UV light irradiation. The tetragonal crystal phase of the nanoparticles was confirmed by XRD analysis. The observed peak shift in XRD patterns confirmed the incorporation of dopant into host lattice. The Yttrium-doped ZrO<SUB>2</SUB> nanoparticles showed a higher specific surface area and smaller optical band gap (191.5 m<SUP>2</SUP>/g and 3.66 eV) than the pristine ZrO<SUB>2</SUB> nanoparticles (108.6 m<SUP>2</SUP>/g and 4.94 eV). The yttrium-doped ZrO<SUB>2</SUB> nanoparticles exhibited greater photocatalytic activity (~98%) than the pure ZrO<SUB>2</SUB> nanoparticles within 40 min, due to their high specific surface area and reduced photogenerated charge carrier recombination rate. The Nyquist plot of yttrium-doped sample exhibited lower charge transfer resistance than that of the undoped sample. The photocurrent of the doped sample (28.6 mA/cm<SUP>2</SUP>) was ~9 times higher than that of pristine ZrO<SUB>2</SUB> sample (3.2 mA/cm<SUP>2</SUP>). The doped sample showed stable and higher photocurrent density up to 520 s under light illumination.</P>
Reddy, Chandragiri Venkata,Reddy, I. Neelakanta,Akkinepally, Bhargav,Harish, V.V.N.,Reddy, Kakarla Raghava,Jaesool, Shim Elsevier 2019 CERAMICS INTERNATIONAL Vol.45 No.12
<P><B>Abstract</B></P> <P>A template-free technique was used to prepare pure and Mn-doped ZrO<SUB>2</SUB> photocatalyst samples in this study. The effect of doping on the structural, optical, photocatalytic, and supercapacitor properties were investigated. X-ray diffraction analysis revealed that the prepared samples had a tetragonal crystal structure. The optical band gap was narrowed due to the incorporation of Mn ions. The photocatalytic activity of methyl orange organic dye degradation with the Mn-doped ZrO<SUB>2</SUB> sample was examined under visible-light irradiation. The doped sample showed 83% of dye degradation after 100 min of irradiation. Cyclic voltammetry was used to study the supercapacitor properties, and the doped samples exhibited capacitance seven times greater than that of the pure sample.</P>
ZrO2/MoS2 Heterojunction Photocatalysts for Efficient Photocatalytic Degradation of Methyl Orange
바티쿠티프랍하카르,변찬,CHANDRAGIRI VENKATA REDDY 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
We report a simple solution-chemistry approach for thesynthesis of ZrO2/MoS2 hybrid photocatalysts, which containMoS2 as a cocatalyst. The material is usually obtained by a wetchemical method using ZrO(NO3)2 or (NH4)6Mo7O24·4H2O andC8H6S as precursors. The structural features of obtainedmaterials were characterized by X-ray diffraction (XRD), highresolutiontransmission electron microscopy (HRTEM), X-rayphotoelectron spectroscopy (XPS), thermal analysis (TG-DTA),N2 adsorption-desorption, and photoluminescence (PL). The influence on the photocatalytic activity of the MoS2 cocatalystconcentration with ZrO2 nanoparticles was studied. The MZr-2 hybrid sample had the highest photocatalytic activity for thedegradation of methyl orange (MO), which was 8.45 times higher than that of pristine ZrO2 ascribed to high specific surface areaand absorbance efficiency. Recycling experiments revealed that the reusability of the MZr-2 hybrid was due to the lowphotocorrosive effect and good catalytic stability. PL spectra confirmed the electronic interaction between ZrO2 and MoS2. Thephotoinduced electrons could be easily transferred from CB of ZrO2 to the MoS2 cocatalyst, which facilitate effective chargeseparation and enhanced the photocatalytic degradation in the UV region. A photocatalytic mechanism is proposed. It isbelieved that the ZrO2/MoS2 hybrid structure has promise as a photocatalyst with low cost and high efficiency forphotoreactions.