Graphene oxide (GO) and functionalized carboxylic graphene oxide (COOH-GO) were successfully synthesized by modified Hummer’s technique. The prepared GO and COOH-GO was characterized successfully by UV-Visible Spectroscopy, Fourier transforms infrared spectroscopy (FTIR), X-ray diffraction, Raman spectroscopy, Scanning electron microscopy (SEM)& Zeta potential. The removal of U(VI) heavy metal comparative study was done by using Graphite, GO & COOH-GO and the removal were confirmed by using LED fluorimeter. The effect of pH of medium, contact time, adsorbent dose, initial concentration of U(VI) were examined for the removal of U(VI). The extent of U(VI) removal has been found to be in the order of COOH-GO >GO> graphite. The U(VI) removal maximum efficiency was observed ~96% observed at pH 4.5. The higher removal efficiency is attributed to the higher negative surface charge of COOH-GO (zeta potential:-39.9 mV) in comparison to zeta potential of GO (-28.9 mV) &graphite (-21.6 mV).
A highly sensitive and selective nanosensing probe for mercury ion is reported. Herein highly luminescent cysteine(cys) functionalized Graphene quantum dots(GQDs) were fabricated through facile one-step pyrolysis method by using ethylene glycol and cysteine. The coating of cysteine not only increases quantum yield to 41% but also enhances selective detection of ppb level of mercury ion in the waste water. The fluorescence intensity of Cys-GQDs was sequentially quenched by different concentrations of mercury ion via forming non-luminescent complexes of Cys-GQDs-Hg(II). HR-TEM study clearly shows a monodisperse Cys-GQDs of sizes 2-5 nm with a spherical shape. Raman spectra of Cys-GQDs display the D and G bands at 1350 cm−1 and 1580 cm−1 respectively. Optimum pH is 8 for mercury detection. The minimum limit for accurate detection of mercury is 0.64 ppb
Background: Widespread implementation of MDT has been an extremely successful strategy for leprosy control across the world including India instead of it Chhattisgarh and Dadra & Nagar Haveli are yet to achieve elimination. Identifying the causes of delay in presentation remains a matter of concern, Hence the present study was conducted with intent to assess the clinico-epidemiological patterns of determinants of Leprosy patients with visible disabilities (Grade II disability) in Raipur District of Chhattisgarh.Methods: This community based cross sectional study was conducted in Raipur district during August 2017- October 2019. 87 Newly diagnosed leprosy patients with visible Grade II disabilities registered during 1st April 2016- 31st March 2017 were included in the study. Patient’s information was obtained from their treatment card and was tracked in the community; necessary information was obtained in a predesigned pretested proforma and clinical examination was carried out.Results: Out of 87 study participants, almost are all the subjects had multi-bacillary type of leprosy. The mean duration between appearance of 1st symptoms & diagnosis was 14.59±11.87 months.Conclusions: The current study has observed many gaps in patient care viz. Lack of supervision of treatment, follow up examination and assessment of disability during course of care. Ignorance of early signs and symptoms was found to be the commonest cause of delayed diagnosis.
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