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Kang, Ji Hye,Yang, Minuk,Yun, Dongju,Kim, Mingeun,Lee, Hyojin,Kim, Ki-Tae,Lim, Mi Hee,Kim, Cheal CNRS 2019 NEW JOURNAL OF CHEMISTRY Vol.43 No.10
<P>A dual chemosensor, 1-NO2, based on the combination of 4-chloro-7-nitrobenzofurazan (NBD) and 1-(2-hydroxyethyl)piperazine, was applied for the detection of sulfide. Chemosensor 1-NO2 could detect sulfide through fluorescence turn-off and color change from orange to pink-red. The sensing mechanism and structure of 1-NO2 with S<SUP>2−</SUP> were demonstrated using Job's plot, ESI-MS analysis and theoretical calculations. In addition, 1-NO2 as a sulfide detector could be used in living organisms (HeLa cells and zebrafish).</P>
Sawant, Sandesh Y.,Kim, Jae Yeol,Han, Thi Hiep,Ansari, Sajid Ali,Cho, Moo Hwan CNRS 2018 NEW JOURNAL OF CHEMISTRY Vol.42 No.3
<P>Colonies of electrochemically active microorganisms called electroactive biofilms (EABs) have potential applications in bioenergy and chemical production. In the present study, an EAB was used as a reducing tool to synthesize Ag-decorated ZnO@C core-shell (Ag-ZnO@C) ternary plasmonic photocatalysts. A simple thermal decomposition route was followed to synthesize ZnO@C nanoparticles using a zinc aniline nitrate complex. The simultaneous adsorption of Ag<SUP>+</SUP> in the carbon shell of the ZnO@C particles during reduction using an EAB allowed the direct contact among Ag nanoparticles, the ZnO core, and the carbon shell. Therefore, the synthesized Ag-ZnO@C ternary photocatalysts showed a stronger interconnection among all the components, which allowed the easy transfer of photogenerated charges and provided enhanced charge carrier separation. Optical characterization showed that the enhanced absorption of visible light along with a decrease in the band gap and a red shift in the valence band maximum occurred due to the decoration of Ag-nanoparticles on ZnO@C. Ag-ZnO@C exhibited higher photocatalytic activity for the degradation of rhodamine blue and 4-nitrophenol under visible light irradiation than ZnO@C and bare ZnO without any significant loss after five successive cycles. Finally, a possible photocatalytic mechanism for charge transfer was proposed to explain the enhanced photocatalytic performance of the Ag-ZnO@C ternary photocatalyst. This study provides insights into the ternary photocatalytic system with a core-shell material and offers a biogenic route for the facile fabrication of Ag-ZnO@C photocatalysts.</P>
Zheng, J.,Kim, C.,Pawar, A.,Kang, Y. CNRS 2017 NEW JOURNAL OF CHEMISTRY Vol.41 No.2
<P>A transparent n-type Bi-doped WO3 (Bi-WO3) thin film with a thickness of ca. 200 nm was fabricated on fluorine-doped tin oxide (FTO) coated glass using a facile spin-coating and annealing method. The compact WO3 layer with a very smooth surface highly enhanced the transmittance of the FTO substrate. Thin p-type Cu2O films with different morphologies were prepared on the Bi-WO3 film by electro-deposition of the same copper precursor solution with different pH values (7, 9 and 11). Magnetic stirring has a limited effect on the PEC performance of the films in our deposition system. The morphologies of the as-obtained films were characterized by scanning electron microscopy, which shows that the films were uniformly composed of nano-sized particles. The photoelectrochemical properties of the films were comparatively studied. Compared with the Bi-WO3 film, Cu2O/Bi-WO3 fabricated at pH 7 showed a better anodic photocurrent via the formation of a p-n heterojunction.</P>
Chinnadurai, Deviprasath,Kim, Hee-Je,Karupannan, Senthil,Prabakar, Kandasamy CNRS 2019 NEW JOURNAL OF CHEMISTRY Vol.43 No.8
<P>Herein, a facile aqueous method was used to prepare multiscale honeycomb-structured activated carbon from mandarin peels using KOH and NaOH as activation agents, and the prepared multiscale honeycomb-structured activated carbon was carbonized under a nitrogen and argon atmosphere. All samples possessed nitrogen due to its natural abundance and exhibited enhanced specific capacitance, whereas metallic sodium (Na)-intercalated samples, which were formed due to NaOH activation, showed large pore size with increased intercalation capacitance although their surface area was reduced. Potassium has been additionally intercalated during cycling in a KOH solution and helped to sustain the micro/mesoporous honeycomb structure as well as increased the number of O-CO bonds with a concomitant reduction in the number of C-C and CC bonds. The honeycomb carbon retains up to 98% of its initial capacitance even after 7000 cycles. The presence of multiscale porosity in the interconnected carbon network structure enhances the reversible adsorption/desorption of ions in the Helmholtz double layer and hence results in high storage capacity and rate capability of the supercapacitors. The highest energy density of 10.92 W h kg<SUP>−1</SUP> at the power density of 240 W kg<SUP>−1</SUP> has been achieved and maintained up to 7.06 W h kg<SUP>−1</SUP> at the higher power density of 1740 W kg<SUP>−1</SUP>. A detailed kinetic study has been employed to better understand the specific capacitance contribution in symmetrical supercapacitors.</P>
Khataee, Alireza,Gholami, Peyman,Sheydaei, Mohsen,Khorram, Sirous,Joo, Sang Woo CNRS 2016 NEW JOURNAL OF CHEMISTRY Vol.40 No.6
<P>Pyrite nanostructures were prepared from pyrite ore particles using a simple and practical plasma treatment process based on the N-2 sputtering technique. The nanostructures were characterized using different techniques, such as XRD, FT-IR, SEM, EDX, XPS, and BET analysis. The performance of the plasma-treated pyrite (PTP) was investigated as a new efficient catalyst for the decolorization of reactive orange 29 (RO29) by the heterogeneous Fenton process in a batch system. 97.6% decolorization was observed in the PTP/H2O2 process, which was higher than the 38.4% decolorization efficiency of the untreated pyrite/H2O2 process. The effects of the operational parameters on the decolorization efficiency were examined, and the 97.6% decolorization efficiency was obtained with an initial RO29 concentration of 20 mg L-1, H2O2 concentration of 3 mM, catalyst dosage of 2 g L-1, pH 5, and reaction time of 90 min. The result obtained from the successive application of PTP in the heterogeneous Fenton processes improved the stability of the catalyst in long-term applications. A plausible degradation pathway of RO29 is proposed based on gas chromatography-mass spectroscopy analysis to explain the improved degradation of RO29 through the PTP/H2O2 process.</P>
A Ca<sup>2+</sup> selective membrane electrode based on calcium-imprinted polymeric nanoparticles
Alizadeh, Taher,Shamkhali, Amir Naser,Hanifehpour, Younes,Joo, Sang Woo CNRS 2016 NEW JOURNAL OF CHEMISTRY Vol.40 No.10
<P>In this work, a Ca2+ selective PVC-membrane electrode, utilizing nano-sized Ca2+ imprinted polymers as the ionophore, was introduced. The imprinted polymer was prepared by precipitation polymerization in acetonitrile. Various types of commercially available functional monomers including methacrylic acid, acrylic acid and itaconic acid were tested for the synthesis of Ca2+-imprinted polymers. The networked polymers obtained were used as the ionophore of PVC membrane electrodes. The potentiometric responses of the electrodes, prepared using different imprinted polymers, showed that the type of functional monomers used had a crucial effect on the analytical characteristics of the related membrane electrode. The membrane electrode composed of itaconic acid based imprinted polymers showed better Nernstian slope and particularly better selectivity for Ca2+ determination. The effectiveness of itaconic acid for complex formation with Ca2+, in comparison to two other monomers (methacrylic acid and acrylic acid), was demonstrated by density functional theory-based calculations. The type of crosslinker agent had a definitive role in the performance of the related electrode. Divinyl benzene based imprinted polymers led to an electrode with no significant sensitivity for Ca2+; whereas, the utilization of ethylene glycol dimethacrylate led to a sensor with ideally Nernstian response. Other components of the membrane such as the plasticizer and ionic additive as well as the solution pH were evaluated and appropriate conditions were selected. The electrode showed a response time of 10 s with no memory effect. A dynamic linear range of 1 x 10(-6)-1 x 10(-1) mol L-1, a Nernstian slope of 30.3 (+/-0.4) mV decade(-1) and a detection limit of 7.5 x 10(-7) mol L-1 were obtained for the electrode. The utility of the electrode was checked by its use as an indicator electrode in the determination of Ca2+ ions via complexometric titration by EDTA.</P>
Min, C.,Na, S.,Shin, J.,Kim, J.,Jo, T.,Kim, C. CNRS 2017 NEW JOURNAL OF CHEMISTRY Vol.41 No.10
<P>A new Schiff-based multifunctional colorimetric chemosensor 1 was developed for the detection of various analytes (Cu2+, Co2+ and S2-). Sensor 1 could simply monitor Cu2+ and Co2+ via the naked eye in an aqueous environment. The quite low detection limits were found to be 0.19 mu M for Cu2+ and 0.18 mu M for Co2+, which were much lower than the values recommended by the World Health Organization (WHO) for Cu2+ (31.5 mu M) and Environmental Protection Agency (EPA) for Co2+ (17 mu M). Importantly, 1 showed high preferential selectivity for Cu2+ and Co2+ over competitive metal ions. For practical applications, the sensing abilities of 1 for detecting Cu2+ and Co2+ were examined in real water samples. In addition, 1 exhibited high selectivity for S2- even in the presence of other anions without any interference. Moreover, the sensing mechanisms of 1 toward Cu2+, Co2+ and S2- were explained by theoretical calculations.</P>