02313nas a2200241 4500008004100000022001400041245012600055210006900181260000800250520143000258653001601688653003201704653002201736653002301758653002501781100002601806700002201832700002201854700002001876700001801896700003001914856012701944 2019 eng d a1861-472800aAg nanoparticles supported on a resorcinol-phenylenediamine-based covalent organic framework for chemical fixation of CO20 aAg nanoparticles supported on a resorcinolphenylenediaminebased  cOCT3 a

Covalent organic frameworks are a new class of crystalline organic polymers possessing a high surface area and ordered pores. Judicious selection of building blocks leads to strategic heteroatom inclusion into the COF structure. Owing to their high surface area, exceptional stability and molecular tunability, COFs are adopted for various potential applications. The heteroatoms lining in the pores of COF favor synergistic host-guest interaction to enhance a targeted property. In this report, we have synthesized a resorcinol-phenylenediamine-based COF which selectively adsorbs CO2 into its micropores (12 angstrom). The heat of adsorption value (32 kJ mol(-1)) obtained from the virial model at zero-loading of CO2 indicates its favorable interaction with the framework. Furthermore, we have anchored small-sized Ag nanoparticles (approximate to 4-5 nm) on the COF and used the composite for chemical fixation of CO2 to alkylidene cyclic carbonates by reacting with propargyl alcohols under ambient conditions. Ag@COF catalyzes the reaction selectively with an excellent yield of 90 %. Recyclability of the catalyst has been demonstrated up to five consecutive cycles. The post-catalysis characterizations reveal the integrity of the catalyst even after five reaction cycles. This study emphasizes the ability of COF for simultaneous adsorption and chemical fixation of CO2 into corresponding cyclic carbonates.

10aCO2 capture10acovalent organic frameworks10acyclic carbonates10aPropargyl alcohols10asilver nanoparticles1 aChakraborty, Debanjan1 aShekhar, Pragalbh1 aSingh, Himan, Dev1 aKushwaha, Rinku1 aVinod, C., P.1 aVaidhyanathan, Ramanathan uhttps://library.ncl.res.in/content/ag-nanoparticles-supported-resorcinol-phenylenediamine-based-covalent-organic-framework02516nas a2200289 4500008004100000022001400041245014300055210006900198260000800267300001400275490000600289520149400295653004001789653002001829653002001849653002001869653002801889653001901917100001701936700002601953700002201979700002402001700002102025700001802046700003002064856013202094 2019 eng d a2574-097000aAqueous-phase differentiation and speciation of Fe3+ and Fe2+ using water-stable photoluminescent lanthanide-based metal-organic framework0 aAqueousphase differentiation and speciation of Fe3 and Fe2 using cAUG a5169-51780 v23 a

Fe2+ is vital to O-2 transportation and photosynthesis regulated by oxidases and reductases. On the other hand, Fe3+ is detrimental due to its irreversible binding to O-2. Hence there is a need for selective identification of Fe3+ from aqueous systems in the presence of Fe2+. However, given their close chemical nature, it is not straightforward to differentiate them. Fe2+ and Fe3+ are typically sensed and differentiated using magnetic measurements, Mossbauer, X-ray absorption spectroscopy, or EXAFS, which are complex and equipment intensive techniques. In comparison, the fluorescence technique is advantageous in terms of time and accessibility. Although readily available lanthanide salts exhibit fluorescence, they are weak, and to serve as an optical probe, their luminescence has to be enhanced via ligand design. Hence we have designed a chromophoric ligand that can covalently bind to lanthanides and enhance its fluorescence intensity, and it binds selectively to Fe3+ through its nitrogen centers. It detects Fe3+ from low concentration (similar to 100 mu M) aqueous solutions, with fast response time (<1 min) and with a detection limit of 3.6 ppm. Importantly, the Fe3+ adsorbed MOF can be readily reactivated for the next cycle by merely washing with an aqueous ascorbic acid solution and can be used for multiple cycles without any appreciable loss in activity. This makes the Ln-MOF an environmentally benign, cost-effective, scalable, and recyclable probe.

10aFe3+ differentiation and speciation10aflexible ligand10afluorescent MOF10airon speciation10aMetal-organic framework10awater sorption1 aMaity, Rahul1 aChakraborty, Debanjan1 aNandi, Shyamapada1 aYadav, Ankit, Kumar1 aMullangi, Dinesh1 aVinod, C., P.1 aVaidhyanathan, Ramanathan uhttps://library.ncl.res.in/content/aqueous-phase-differentiation-and-speciation-fe3-and-fe2-using-water-stable-photoluminescent01409nas a2200301 4500008004100000022001400041245013700055210006900192260000900261300001400270490000600284520050300290653001000793653001100803653001100814653001500825653001400840653000900854653001800863653001400881653001900895653001300914653001000927100001300937700001800950700001800968856012100986 2019 eng d a2365-654900aAu based Ni and Co bimetallic core shell nanocatalysts for room temperature selective decomposition of hydrous hydrazine to hydrogen0 aAu based Ni and Co bimetallic core shell nanocatalysts for room  cMAR  a2734-27400 v43 a

Nickel and Cobalt bimetallic catalysts with Au as core metal has been synthesized and demonstrated for hydrazine decomposition reaction for producing hydrogen. Gold-cobalt and gold nickel bimetallic system belonging to the class of strained structures with high lattice mismatch of approximately 14% are demonstrated for synergistic effects atypical of monometallic counterparts for the selective decomposition of hydrous hydrazine to H-2 with N-2 as the other product at room temperature.

10a(HDR)10aAu@Co.10aAu@Ni.10aBimetallic10acatalyst.10acore10adecomposition10aHydrazine10ananoparticles.10areaction10ashell1 aJain, P.1 aAnila, K., A.1 aVinod, C., P. uhttps://library.ncl.res.in/content/au-based-ni-and-co-bimetallic-core-shell-nanocatalysts-room-temperature-selective05420nas a2200217 4500008004100000022001400041245011600055210006900171260000800240300001000248490000800258520464600266653001604912653002204928653002904950653003604979100001905015700001805034700002205052856012805074 2021 eng d a0008-622300aAutophagy and unique aerial oxygen harvesting properties exhibited by highly photocatalytic carbon quantum dots0 aAutophagy and unique aerial oxygen harvesting properties exhibit cAUG a16-270 v1813 a

Plastic pollution is a serious threat to the environment as they are not bio-degradable. Herein using waste-polyethylene, we report two inter-related important findings. First that they can be converted economically and completely into highly photocatalytic carbon quantum-dots (CQDs) using H2O2 as a residue-free oxidant in an acid medium, and they have the ability to enrich a reaction medium with an extraordinary amount of molecular oxygen harvested from the air so that no separate oxygen source is needed while carrying out facile photocatalytic oxidation reactions. Second, when they are not performing any photocatalytic reaction, they exhibit self-sensitized photo-oxidation to convert themselves completely to CO2 in the presence of sunlight, a phenomenon that we term as ‘CQD-autophagy’ by drawing parallels to the death of useless-cells in the body. Such extinction from the reaction media is unique as no other material is known to do so and advantageous because the removal of carbon-dots from a solution is rather inefficient from an industry-viewpoint due to their high solubility. Instead, the inexpensive CQDs can be discarded casually with the notion that they will gradually get eliminated from the environment.

10aCarbon dots10aOxygen-enrichment10aPhotocatalytic oxidation10aSelf-sensitized photo-oxidation1 aMondal, Sanjit1 aVinod, C., P.1 aGautam, Ujjal, K. uhttps://library.ncl.res.in/content/autophagy-and-unique-aerial-oxygen-harvesting-properties-exhibited-highly-photocatalytic02689nas a2200337 4500008004100000022001400041245014200055210006900197260000800266490000700274520145100281653004201732653003801774653002701812653003601839653003601875653002801911653002301939100002001962700003001982700002702012700003002039700002702069700002402096700002102120700001802141700001802159700002602177700002402203856012402227 2023 eng d a1613-681000aActive site engineering and theoretical aspects of ``Superhydrophilic'' nanostructure array enabling efficient overall water electrolysis0 aActive site engineering and theoretical aspects of Superhydrophi cDEC0 v193 a

The rational design of noble metal-free electrocatalysts holds great promise for cost-effective green hydrogen generation through water electrolysis. In this context, here, the development of a superhydrophilic bifunctional electrocatalyst that facilitates both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline conditions is demonstrated. This is achieved through the in situ growth of hierarchical NiMoO4@CoMoO4 center dot xH(2)O nanostructure on nickel foam (NF) via a two-step hydrothermal synthesis method. NiMoO4@CoMoO4 center dot xH(2)O/NF facilitates OER and HER at the overpotentials of 180 and 220 mV, respectively, at the current density of 10 mA cm(-2). The NiMoO4@CoMoO4 center dot xH(2)O/NF parallel to NiMoO4@CoMoO4 center dot xH(2)O/NF cell can be operated at a potential of 1.60 V compared to 1.63 V displayed by the system based on the Pt/C@NF parallel to RuO2@NF standard electrode pair configuration at 10 mA cm(-2) for overall water splitting. The density functional theory calculations for the OER process elucidate that the lowest Delta G of NiMoO4@CoMoO4 compared to both Ni and NiMoO4 is due to the presence of Co in the OER catalytic site and its synergistic interaction with NiMoO4. The preparative strategy and mechanistic understanding make the windows open for the large-scale production of the robust and less expensive electrode material for the overall water electrolysis.

10adensity functional theory (DFT) study10ahydrogen evolution reaction (HER)10aHydrothermal synthesis10aoxygen evolution reaction (OER)10asuperhydrophilic nanostructures10asynergistic interaction10awater electrolysis1 aBarik, Sidharth1 aKharabe, Geeta, Pandurang1 aIllathvalappil, Rajith1 aSingh, Chandrodai, Pratap1 aKanheerampockil, Fayis1 aWalko, Priyanka, S.1 aBhat, Suresh, K.1 aDevi, Nandini1 aVinod, C., P.1 aKrishnamurty, Sailaja1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/active-site-engineering-and-theoretical-aspects-superhydrophilic-nanostructure-array00915nas a2200253 4500008004100000022001400041245012200055210006900177260000900246300001400255490000700269653001700276653003100293653002900324100002500353700001700378700001800395700002300413700002300436700002200459700003200481700001800513856013000531 2024 eng d a2168-048500aAtmospheric-pressure continuous-flow methane oxidation to methanol and acetic acid using H2O2 over the Au-Fe catalyst0 aAtmosphericpressure continuousflow methane oxidation to methanol cMAY  a8958-89670 v1210aCO oxidation10aHIGHLY SELECTIVE OXIDATION10ametal-organic frameworks1 aJagtap, Anuradha, V.1 aKumar, Pawan1 aGupta, Sharad1 aNagendra, Abharana1 aJha, Shambhu, Nath1 aBhattacharyya, D.1 aAjithkumar, Thalasseril, G.1 aVinod, C., P. uhttps://library.ncl.res.in/content/atmospheric-pressure-continuous-flow-methane-oxidation-methanol-and-acetic-acid-using-h2o2