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Abdul Rehman Umar,Kashif Hussain,Zara Aslam,Muhammad Anwar Ul Haq,Haji Muhammadb,Sirajuddin,Muhammad Raza Shah 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
This work was initiated by synthesizing a carboxylic derivative of Calix[4]resorcinarene through a threestep protocol confirmed by proton nuclear magnetic resonance (1H NMR) spectroscopy and Electrosprayionization mass spectroscopy (ESI-MS). As synthesized derivative, was used as reducing and cappingmaterial for the fabrication of small and stable silver nanoparticles (AgNPs) in aqueous medium underthe combined influence of dilute alkali and heat at 90 C. These nanoparticles were referred as KM20-AgNPs. Techniques used for characterization of AgNPs include UV–Visible (UV–Vis) spectroscopy,Fourier transform infra-red (FTIR) spectroscopy, atomic force microscopy (AFM), dynamic light scattering(DLS) and zeta potential analyzer (ZPA). The finally produced KM20-AgNPs were recognized as highlysensitive and extremely selective voltammetric sensor for low level detection of methylene blue drugin the linear working range of 1–30 nM with limit of detection (LOD) and limit of quantification (LOQ)as 0.16 nM and 0.53 nM respectively. The developed sensor was successfully used for sensing of MB inhuman blood plasma.
Morphology controlled facile synthesis of MnO2 adsorbents for rapid strontium removal
Umar Asim,Syed M. Husnain,Naseem Abbas,Faisal Shahzad,Abdul Rehman Khan,Tahir Ali 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
MnO2 nanostructures with three distinct architectures, namelyflower, balk and tube-like, have beensynthesized through a single step microwave assisted hydrothermal method at different reactiontemperatures (110 C, 140 C and 180 C). The characterization of as prepared MnO2 samples wereperformed by means of Fourier transform infrared spectroscopy, X-ray diffraction, scanning electronmicroscopy, and transmission electron microscopy. The N2 adsorption–desorption isotherms revealedthe higher specific surface area and porosity of theflower like MnO2 as compared to balk and tube-likeMnO2. The adsorption behavior of as prepared adsorbents was investigated towards Sr2+ radionuclide. Because of the hierarchal structure and the high surface area (62.64 m2/g), MnO2-110 depicted the bestSr2+ adsorption performance with maximum adsorption capacity of 52 mg/g at pH 6 as compared to otherMnO2 morphologies synthesized at 140 C and 180 C. The kinetic studies revealed that the adsorption ofSr2+ onto MnO2-110 followed the pseudo-first-order model whereas the adsorption equilibrium dataobeyed the Freundlich and Sips model. Moreover, the MnO2-110 adsorbent reached the steady statequickly ( 10 min) and is capable to bind Sr2+ in slightly acidic to alkaline solutions.
Shujaat Ali,Abdul Rehman Umar,Kashif Hussain,Haji Muhammad,Muddasir Hanif,Mouna Hind Laiche,Sufian Rasheed,Kousar Yasmeen,Abdul Hameed,Muhammad Raza Shah 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
It’s crucial to develop cost-effective, rapid & reliable detection methods of specific analytes through sensorsuseful in the analytical and medicinal chemistry. We report a highly sensitive and selective colorimetricmethod for the detection of clonazepam by the new composite sensor DH-1,6-NAPY-8-CNAgNPscontaining 5-amino-7-(4-benzylpiperazin-1-yl)-2,4-bis(4-bromophenyl)-2-methyl-1,3-dihydro-1,6-naphthyridine-8-carbonitrile capped silver nanoparticles (AgNPs). The detection mechanism is basedon the H-bonding interactions between clonazepam and the sensor, that caused the aggregation of NPsthat initiated a sharp color change from yellow to red. The linear relationship between the adjacentabsorbance values (DA) vs. clonazepam concentration (range = 0.05–75 lM) showed a correlation coefficientof 0.9927. The limit of detection (LOD) was 3 nM, that is very significant achievement over theexisting reports. The proposed sensor is highly selective, with no interference from many other possibleinterfering substances. The sensor was successfully applied to the aqueous and human plasma samples,therefore DH-1,6-NAPY-8-CN-AgNPs demonstrated great potential for the on-site and real-time screeningof Clonazepam.