Chemistry

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https://hdl.handle.net/20.500.14540/125

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Browsing Chemistry by Academic Level "Other"

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    Estimation of Copper in Copper Ores Collected from Jangkot Rolpa, Nepal
    (2024-06) Rajaure, Anil; Dr. Deval Prasad Bhattarai
    Nepal is a country rich in natural resources. There is evidence of the presence of mines of different types of elements, but scientific research in this field is found to be less. Zinc, iron, copper, etc. are the major sources of mines here which have been extracted since time immemorial. But these days, significant research and extraction of such minerals have not been found to occur. In this context, it seems desirable to study and research the mines available in Nepal. In this study, five samples of copper ores were collected from Jangkot Rolpa and examined using Titrimetric analysis, atomic absorption spectroscopy and x-ray diffraction (XRD) methods. The results show that sample C1RJ has the highest copper concentration (2.20% by titration and 1.64% by AAS) among the test samples, indicating that the collected samples contain extractable amounts of copper in that location. The XRD results confirms the ores are auzurite, malachite, cuprite and chalcocite. However, further research is required to carry out the quality of the copper deposit.
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    Green synthesis of Silver nanoparticles using Rudraksha extracts:characterization and its applications for antimicrobial activities
    (Institute of Science & Technology, 2024-06) Jha, Gautam Kumar; Dr. BHOJ RAJ POUDEL
    Different methods are reported for synthesis of AgNPs. In this research green synthesis of AgNPs is used as it is simple, economical, environmentally friendly and nontoxic process. Leaves extract of Rudraksha plant has been used for synthesis of AgNPs. Rudraksha and AgNPs both have antimicrobial activity. Green Reduction Ag+ was carried out. Phytochemicals present in leaves extract was studied at room temperature. The Synthesized AgNPs was characterized using techniques UV -visible Spectral analysis, XRD, and FTIR followed by assessment of antimicrobial property against some bacteria and fungus of extract, AgNPs and their composite 1:1 mass ratio. The size of synthesized AgNPs was about 11.93nm. The antimicrobial activity of AgNPs was enhanced by leaf extract of Rudraksha.
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    Iresine herbstii stem alkaloids as green inhibitor for mild steel corrosion in M H2SO4 solution
    (2024) Pant, Naresh Prashad; Dr. Deval prasad Bhattarai
    The study examined the methanol extract obtained from Irsine herbstii stem as a green inhibitor for mild steel corrosion in a 1M H2S04 environment. Characterization of the extract was carried out using Fourier Transform Infrared Spectroscopy and potentiostat. Additionally, inhibition efficiency was determined through both weight loss and electrochemical measurement methods, with results indicating a maximum inhibition efficiency of 87.28%. Thermodynamic parameters further confirmed the feasibility and spontaneity of the adsorption process. Overall, the findings underscored the potential effectiveness of the inhibitor derived from Irsine herbstii alkoloid extract in mitigating mild steel corrosion in acidic environments.
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    Status of arsenic contamination in the groundwater of nawalparasi west district and Remediation Using ZnCL2 Activated sugarcane bagasse as bioadsorbent
    (2024-06) Ghimire, Khag Raj; : Dr. Bhoj Raj Poudel
    Groundwater sources contaminated by arsenic represent a global threat to the environment and living organisms, including humans. Exposure to arsenic for a long period would have a severe health impact. Various conventional techniques are being applied to treat arsenic contaminated water, which are either expensive or less efficient. So, there is a need to develop cost-effective alternative technologies for the removal of arsenic. This research will investigate the possibility of using agro-waste like sugarcane bagasse as a readily available, affordable, eco-friendly bioadsorbent for remediation of toxic pollutants from water. The main target of this study is to develop a novel adsorbent from sugarcane bagasse by ZnCl2 activation. As it is reported that Nawalparasi West district in Lumbini Province has a high concentration of arsenic in ground water, the performance of bio-adsorbent will be examined by 30 different samples from arsenic contaminated area of Nawalparasi. The material which will be developed in this research from sugarcane bagasse is supposed to be efficient and selective for specified arsenic. The batch experiment will be carried out under varying experimental conditions. The kinetics of the adsorption reaction and the adsorption isotherm will be studied. The experimental results will be applied to the treatment of ground water samples from Ramgram municipality, Nawalparasi west district.
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    Study on effect of sodium stearate surfactant in mixed solvent media
    (2024) Yadav, Brahma Deo; : Prof. Dr. Ajaya Bhattarai
    The specific conductivity of sodium stearate(SS) surfactant in double distilled water, different percentage of methanol are studied by conductometric method at three temperatures (298.15, 308. 15, 318.15) K. The Critical Micelle Concentration (CMC) of sodium Stearate is determined at all temperatures. CMC is increased with an increase in temperature of the solution. the CMC of SS in distilled water at (298.15, 308. 15, 318.15) K. is 0.0008M, 0.0010M, 0.0020M was obtained . The specific conductance is decreased with increase in percentage of methanol in the solution. The corrosion rate of surfactant is observed. FESEM image, EDX graph shows the purity of the sample. The percentage of elements present in sodium stearate surfactant is explained by EDX data. The percentage of C, O, Na, sodium stearate surfactant is observed 77, 14.2, 2.5 percent by weight.