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Karanveer Singh,Deepak Kukkar,Ravinder Singh,Preeti Kukkar,Nardev Bajaj,Jagpreet Singh,Mohit Rawat,Akshay Kumar,Ki-Hyun Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
In this manuscript, we report the insitu growth of gold nanoparticles (GNPs) and silver nanoparticles(SNPs) over Ce/Tb-doped Y-benzene tricaroboxylate metal organic frameworks (MOF-76). Thephotocatalytic potential of these nanocomposites (NCs) was then assessed for the photocatalyticreduction of p-nitrophenol (p-NP) in aqueous medium. The NCs had large surface area to favorablyshowcase the efficient absorption of light energy. Correspondingly, it facilitated the electron transferbetween the valance and conduction bands to promote the reductive removal of p-NP. Among the testedcatalysts, GNPs@MOF-76 (Ce) (MOF-76(1a)) (dosage: 10 ml of 5 mg.ml 1) recorded the maximumcatalytic efficiency (96.3%) with an apparent rate constant (K0app: 0.33 min 1). Further, MOF-76 (1a) NCsexhibited good recyclability (e.g., a catalytic efficiency of 77.45% over 3 cycles). Moreover, the proposedNCs exhibited superior performance over commercial photocatalysts (e.g., p25 TiO2 nanopowder)towards p-NP reduction. As such, the results of this experimental study successfully demonstrated thesuperiority of the MOF immobilized nanoparticles (NPs) as an efficient platform for the removal ofindustrial grade pollutants.
Karanveer Singh,Deepak Kukkar,Ravinder Singh,Preeti Kukkar,김기현 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
The manuscript reports synthesis of exceptionally stable gold nanoparticles (GNPs) using Momordica charantia fruit extract. The synthesis approach was optimized by refining three experimental variables including source of the fruit extract (peel, seed, and seed coat), pH of the solution, and temperature of the reaction medium. As synthesized GNPs showed excellent stability against various thiolated compounds (e.g., thioglycolic acid, thiourea, l-cystine, 1-dodecanethiol, and cysteamine hydrochloride). Moreover, these nanoparticles showed distinctive colorimetric responses against Cd2+ and thiophenol (TP) from their potential interferences. The limit of detection (LOD) values for Cd2+ and TP were determined as 0.186 and 0.154 μM, respectively.
Kukkar, Preeti,Kukkar, Deepak,Sammi, Heena,Singh, Karanveer,Rawat, Mohit,Singh, Pritpal,Basu, Soumen,Kim, Ki-Hyun Elsevier 2018 Sensors and actuators. B Chemical Vol.271 No.-
<P><B>Abstract</B></P> <P>In this study, we investigated the optimal conditions for solvothermal-assisted synthesis of Eu-BDC-NH<SUB>2</SUB> metal organic frameworks (MOFs) to improve their sensing capacity toward some selected target metal species. To this end, we focused on the interactive relationships between key synthesis variables (e.g., the relative molar ratios (and absolute amounts) of the reactants [EuCl<SUB>3</SUB>·6H<SUB>2</SUB>O vs. amino terephthalic acid (BDC-NH<SUB>2</SUB>)], temperature, and reaction duration). It was observed that different types of MOFs synthesized under diverse conditions consistently exhibited emission profiles of Eu<SUP>3+</SUP>. However, their luminescence properties were distinguished systematically by the synthesis conditions set for each sample group. The sensing potential of luminescent MOFs was explored for detection of toxic metal ions through two approaches, i.e., direct chemosensing and indirect biomolecule mediated sensing approach. In the former, the MOFs exhibited noticeable turn-off fluorescence behavior, especially with Hg<SUP>2+</SUP> ions (i.e., a high Stern-Volmer quenching constant (K<SUB>sv</SUB>) of 6.42 × 10<SUP>5</SUP> M<SUP>−1</SUP> and limit of detection (LOD) of 0.007 M). In the latter, nanocomposites of MOFs-cyanocobalamin were characterized by a highly selective turn on fluorescence response towards Co<SUP>2+</SUP> ions (K<SUB>sv</SUB> = −6.25 × 10<SUP>3</SUP> M<SUP>−1</SUP>; LOD = 0.7 M). As such, the sensing capacity of these MOFs was distinguished efficiently by control of synthesis variables.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Optimized synthesis of Eu-BDC-NH<SUB>2</SUB>-MOFs by solvothermal approach. </LI> <LI> Effect of three variables i.e. molar ratio of reactants, temperature and time period reported has been investigated. </LI> <LI> Enhanced luminescence intensity, high reproducibility, and high stability of the MOFs upto 1 year. </LI> <LI> Significant turn off fluorescence in presence of 1 ppm Hg<SUP>2+</SUP> metal ions. </LI> <LI> Distinct turn on fluorescence of MOF-CNCbl nanocomposites in presence of 1 ppm Co<SUP>2+</SUP> ions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>