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- 저자 : Ahmaruzzaman (검색결과 4 건)
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Amino acid mediated synthesis of luminescent SnO2 nanoparticles
Archita Bhattacharjee,M. Ahmaruzzaman,Asim K. Sil,Tanur Sinha 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Tin oxide (SnO2) nanoparticles of average sizes 6, 16 and 33 nm were synthesized successfully by asimple chemical precipitation method using an amino acid, glycine at different calcination temperaturesof 200, 400, and 600 8C, respectively. This method resulted in the formation of spherical, polycrystallineSnO2 nanoparticles with a higher degree of monodispersity. The sizes of the SnO2 nanoparticles werefound to be a factor of calcination temperature. The synthesized SnO2 nanoparticles have atetragonal rutile structure. Due to three dimensional quantum confinement effect shown by thesynthesized SnO2 nanoparticles in their electronic spectra, an increase in band gap energy (3.85–4.21 eV) is observed with a decrease in particle size ( 33 to 6 nm). The synthesizednanomaterials were characterized using X-ray diffraction (XRD), Transmission electronmicroscopy (TEM), and Fourier transformed infrared spectroscopy (FT-IR). The optical propertieswere investigated using UV–vis spectroscopy and photoluminescence spectroscopy (PL). Interestingly, the photoluminescence property was shown by the material calcined at 400 8C. The effects of various polar and non-polar solvents on the absorption spectra of the synthesizedSnO2 nanoparticles were studied. The plausible reaction mechanism for the formation of SnO2nanoparticles was also proposed.
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Pamreishang Kasar,Md. Ahmaruzzaman 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.7
It is imperative to know the energy content of the char to ascertain its application, which is environmentally friendly and efficient. In this context, the higher heating values (HHV) of the char resulting from the co-cracking of residual fuel oil (RFO) with various other waste plastics have been determined experimentally. Experimental results of the proximate and ultimate analysis of the char obtained from the co-cracking process were used to estimate the higher heating values (HHV) using eight different correlation models. The char obtained from the co-cracking of RFO and polypropylene (PPI) was found to have higher heating values (HHV) of 31.02 MJ/kg, while the HHV of Bakelite (BL) showed 23.56MJ/kg. The best among the proximate correlations considered in this study resulted in the coefficient (R2) of 0.971, the average bias of 0.68%, and absolute error of 1.70%. The most relevant among the ultimate correlation models resulted in the coefficient of determination (R2) of 0.980, whereas the average and absolute bias errors were found to be 1.29% and 0.25%, respectively. The proximate and ultimate analysis of the chars reveals a direct interaction between the reactive species during the co-cracking of RFO with various types of plastic waste used in the study.
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Gaurav Yadav,Md. Ahmaruzzaman 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Photocatalysis is the most viable and significant approach for treating wastewater for several reasons,including its simplicity, low cost, reproducibility, manageability, and efficiency. Photocatalysis is considereda green technology and utilizes less energy, and is safe for humans as well as animals. Due to thenon-toxic behavior of several semiconductor materials, such as TiO2, ZnO, SnO2, CeO2, and othercarbon-based catalysts, they are used efficiently for pollutant degradation. Phenolic derivatives are producedfrom natural and artificial processes, thus causing threats to human health as well as the environment. High concentrations of phenolic effluent will be created during industrial manufacturingoperations, notably those involving petroleum processing. In this review, (1) photocatalytic treatmentof phenolic compounds using various metal oxide and carbon-based catalyst, (2) influence of variousreaction parameters, and (3) the mechanism and kinetics of the photodegradation of phenolic compounds,are discussed. It was noticeable that low-cost photocatalysts illustrated remarkable photocatalyticdegradation efficiency for phenolic compounds.
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Th. Babita Devi,Dipyaman Mohanta,Md. Ahmaruzzaman 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
This study discusses the prospect of using a biomass waste material, such as jute stick in the developmentof new technological material for the sustainable environmental application. In this article, wesynthesized silver loaded activated carbon (Ag-AC) nanocomposite using a chemical precipitationmethod. The as-synthesized Ag-AC nanocomposite exhibited excellent antimicrobial activity towardgram negative and positive bacteria, such as Escherichia coli (E. coli), Pseudomonas aeruginosa (P. aeruginosa), Bacillus subtilis (B. subtilis) and Staphylococcus aureus (S. aureus). This may be because of thefact that the antibacterial effect of the silver nanoparticles was enhanced due to the presence of activatedcarbon (AC). We also compared the antimicrobial activities of Ag-AC nanocomposite with metallicnanoparticles (silver) and it was observed that the nanocomposite showed better antimicrobial propertythan that of metallic silver nanoparticles. The Ag-AC nanocomposite may, therefore, have the prospectsfor use as an antibacterial agent. In the present study, we also investigated the catalytic activity of Ag-ACnanocomposite for the degradation of toxic dye (malachite green oxalate) and pharmaceutical activecompound (Clofibric acid) under solar irradiation. The malachite green oxalate and Clofibric acid werecompletely degraded within 90 min and 80 min using Ag-AC nanocomposite. Hence, the Ag-ACnanocomposite showed good antimicrobial as well as an excellent photocatalytic activity.
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