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( Love Kumar Dhandole ),( Mahadik Mahadeo Abasaheb ),김수경,조민,류정호,장점석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Transition metal oxides loaded acid treated TiO<sub>2</sub> nanorods (NRs) were successfully prepared by chemical treatment and wet impregnation methods. The catalysts were characterized by XRD, TEM, XPS, FT-IR and UV-DRS. The photocatalytic activities of as-prepared, acid treated, metal oxide loaded and metal oxide loaded acid treated NRs were compared and dye degradation efficiency were determined from kinetics of the degradation of Orange (II) dye. Cobalt oxide 1w% loaded on 1.0 M acid treated TiO<sub>2</sub> NRs exhibited the higher photocatalytic Orange (II) degradation efficiency 98.57% (within 120 min) than as-prepared and metal oxide loaded samples. The synergistic effect of cobalt oxide on acid treated TiO<sub>2</sub> NRs over dye degradation is considered as fine dispersion of metal oxides on the OH rich surface of TiO<sub>2</sub>. The mechanism of enhanced photocatalytic activity and photoelectrochemical analysis of photocatalyst also studied. <sup>**</sup>This work was supported by the BK21 plus program.
Strontium uptake using Titanate nanotubes as adsorbent material prepared via hydrothermal method
( Love Kumar Dhandole ),( Jungho Ryu ),( Byoung Gyu Kim ),( Jeong Muk Lim ),( Byung Taek Oh ),( Jum Suk Jang ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Strontium ions sorption recovery from seawater is a most challenging task. Seawater is the rich resource of most of the salts dissolved in ionic form. Strontium ions concentration in seawater has approximately ~8 ppm which is very poor from other alkali and alkaline earth metals ion concentrations. This ions uptake recovery experiment has been based on strontium ions sorption in its aqueous salt as well as calcium aqueous mixtures (~400 ppm Ca) solution. During this experiment titanate metal oxide nanotubes used as adsorbent material for aqueous strontium ions sorption. Ion adsorption mechanism of strontium recovery has been studied and our experimental results has shown the titanate nanotubes were the best promising adsorbent material for strontium uptakes because of large surfaced area and high pore volume which adsorbed almost 99% of strontium ions from strontium chloride aqueous salt mixture. Titanate nanotubes were synthesized from molten salts TiO2 nanowires by using one pot hydrothermal method at high alkaline solution (10M NaOH). Titanate nanotubes material characterizations have been studied by FE-SEM, XRD, BET and strontium recovery analysis has been performed by inductive coupled plasma instrument.
Dhandole, Love Kumar,Mahadik, Mahadeo A.,Kim, Su-Gyeong,Chung, Hee-Suk,Seo, Young-Seok,Cho, Min,Ryu, Jung Ho,Jang, Jum Suk American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.28
<P>In the present work, we accomplish the boosting of photocatalytic performance by the synergistic effect of acid treatment and transition metal oxide co-catalysts on molten salt rutile TiO2 nanorods. FT-IR and XPS (oxygen deconvolution) results confirmed that the amount of hydroxyl groups increased on the surface of ruffle TiO2 nanorods (TO-NRs) after acid treatment. HR-TEM analysis revealed fine dispersion of metal oxide on the surface of acid treated TiO2 nanorods (ATO-NRs). The photocatalytic activities of as-prepared (TO-NRs), acid treated (ATO-NRs), metal oxide loaded (MTO-NRs), and both acid treated and metal oxide loaded (MATO-NRs) nanorods were compared based on the rate kinetics and dye degradation efficiencies. Cobalt oxide (1 wt %) loaded and 1.0 M acid treated TiO2 nanorods (Co/ATO-NR) exhibited the higher photocatalytic degradation efficiency for Orange-II dye degradation and inactivation of S. typhimurium pathogen compared to other photocatalysts under solar irradiation. Photoelectrochemical analysis demonstrated that the charge transfer process in Co/ATO-NR is significantly higher than that in the untreated samples. The improved photocatalytic activity of inactive TO-NRs might be due to enhanced charge transfer of finely dispersed metal oxides on the OH-rich surface of acid treated TiO2 nanorods.</P>
Kim, Su-Gyeong,Dhandole, Love Kumar,Seo, Young-Seok,Chung, Hee-Suk,Chae, Weon-Sik,Cho, Min,Jang, Jum Suk Elsevier 2018 Applied Catalysis A Vol.564 No.-
<P><B>Abstract</B></P> <P>In this study, rhodium-antimony co-doped TiO<SUB>2</SUB> nanorods and titanate nanotube (RS-TONR/TNT) composite was hydrothermally synthesized from rhodium-antimony co-doped TiO<SUB>2</SUB> nanorod (RS-TONR). Initially, RS-TONR and RS-TONR/TNT samples were photocatalytic inactive under visible light irradiation (<I>λ</I>≥420 nm). Catalytic performance of RS-TONR/TNT composite was improved by surface protonation and then post-calcination process. Calcination of protonated sample has transformed most titanate nanotubes of RS-TONR/TNT into anatase TiO<SUB>2</SUB> nanoparticle (TNP) in the composite. This composite contains admixture of both rutile phase of TiO<SUB>2</SUB> nanorods and TiO<SUB>2</SUB> nanoparticle (48/RS-TONR/TNP-400). The photocatalytic activity of 48/RS-TONR/TNP-400 composite was increased for decomposition of organic compounds under visible light irradiation. In the composite structure rutile phase of TiO<SUB>2</SUB> nanorods composed of rhodium-antimony co-doping is responsible for absorption of visible light irradiation and low band edge position of TNP facile the transport of conduction band charge carriers. At next step, 48/RS-TONR/TNP-400 sample was loaded with copper oxide as co-catalyst. The synergistic effect of calcination and co-catalyst was observed as Cu(3 wt%) 48/RS-TONR/TNP-400 sample showed the highest photocatalytic performance for degradation of organic pollutants. Also, Cu(3 wt%)-48/RS-TONR/TNP-400 photocatalyst was successfully applied for disinfection of both Gram-negative and Gram-positive bacterial pathogens such as <I>E. coli, S. typhimurium</I> and <I>L. monocytogenes</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Active composite photocatalyst synthesized by inactive Rh & Sb doped TiO<SUB>2</SUB> nanorods. </LI> <LI> Calcination induces phase change in composite material and enhanced the activity. </LI> <LI> Higher photocatalytic activity was observed after Cu<SUB>x</SUB>O loading on calcined composites. </LI> <LI> Synergistic effect on photocatalytic activity was studied by organic degradation. </LI> <LI> Optimized sample also shows the inactivation of <I>Gram-negative/positive</I> pathogens. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Su-Gyeong,Dhandole, Love Kumar,Lim, Jeong-Muk,Chae, Weon-Sik,Chung, Hee-Suk,Oh, Byung-Taek,Jang, Jum Suk Elsevier 2018 Applied Catalysis B Vol.224 No.-
<P><B>Abstract</B></P> <P>In this study, rhodium and antimony doped nanorod (RS-TONR) was prepared by a molten salt solid state chemical reaction, and TiO<SUB>2</SUB> nanorod and titanate nanotube (RS-TONR/TiNT) composite photocatalyst was synthesized by a hydrothermal method for different reaction times. The structural and chemical analyses of nanomaterials were performed by FE-SEM, XRD, UV-DRS and surface BET characterizations. The XRD and HR-TEM data confirmed that the as-synthesized material had mixed phase of TiO<SUB>2</SUB> nanorod and Titanate nanotube (RS-TONR/TiNT). The photocatalytic activity of the composite photocatalyst was observed over the degradation of Orange (II) dye under visible light irradiation. Acid treatment and copper loading was conducted to enhance the surface property of RS-TONR/TiNT sample. The formation of TiO<SUB>2</SUB> nanoparticle with anatase phase was observed by TEM and XRD analysis. The TEM mapping data also confirmed that copper oxide nanoparticles were well dispersed on the surface of titanate nanotubes. These dispersed nanoparticles were observed by XPS and STEM characterizations. The higher removal efficiency of Cd<SUP>2+</SUP> ions was observed over the acid treated and untreated Cu3-TNP/TiNT/RS-TONR in the presence of Orange (II) dye. A higher photocatalytic activity of acid treated and Cu3-TNP/TiNT/RS-TONR was simultaneously obtained in the presence of cadmium ions during the degradation of Orange (II) dye.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Rh and Sb co-doped crystalline rutile TiO<SUB>2</SUB> nanorod (NR) was synthesized via molten salt flux method. </LI> <LI> The RS-TONR/TiNT was hydrothermally synthesized for different reaction times. </LI> <LI> Acid treatment was conducted to enhance the surface property of RS-TONR/TiNT sample. </LI> <LI> Finely dispersed Cu<SUB>x</SUB>O on TNP/RS-TONR/TiNT significantly improves the photocatalytic activity. </LI> <LI> Synergistic effect in photocatalytic performance was studied by Orange (II) dye degradation and Cd<SUP>2+</SUP> ion adsorption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>