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RISS 인기검색어
- 검색키워드
- 저자 : Kashif Rasool (검색결과 8 건)
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Rasool, Kashif,Lee, Dae Sung American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>The increasing use of silver nanoparticles (AgNPs) in commercial products and industrial processes raises issues regarding the toxicity of sludge biomass in biological wastewater treatment plants, due to potential antimicrobial properties. This study investigated the effects of AgNPs on removal of organic pollutants and sulfate in an anaerobic biological sulfate reduction process. At AgNPs concentrations of up to 10 mg/L, no significant inhibition of sulfate and COD removal was observed. However, at higher concentrations (50-200 mg/L) sulfate and COD removal efficiencies were significantly decreased to 51.8% and 33.6%, respectively. Sulfate and COD reduction followed first-order kinetics at AgNPs concentrations of up to 10 mg/L and second-order kinetics at AgNPs concentrations of 50-200 mg/L. Lactate dehydrogenase release profiles showed increases in cytotoxicity at AgNPs concentrations greater than 50 mg/L suggesting cell membrane disruption. Analysis of extracellular polymeric substances (EPS) from sulfidogenic sludge biomass and of Fourier transform infrared (FT-IR) spectra showed a decrease in concentrations of carbohydrates, proteins, humic substances, and lipids in the presence of AgNPs. Moreover, the interaction of AgNPs with sludge biomass and the damage caused to cell walls were confirmed through scanning electron microscopy with energy dispersive X-ray spectroscopy.</P>
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Manzoor Kashif,Rasool Fayyaz,Khan Noor,Anjum Khalid Mahmood,Parveen Shakeela 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.5
Edwardsiella tarda is one of the most significant fish pathogens, causes edwardsiellosis in a variety of freshwater fish species, and its antibiotic resistance against multiple drugs has made it a health risk worldwide. In this study, we aimed to investigate the antibiotic resistance (ABR) genes of E. tarda and establish its antibiotic susceptibility. Thus, 540 fish (299 Oreochromis niloticus, 138 O.mossambicus, and 103 O. aureus) were collected randomly from twelve fish farms in three districts of Punjab in Pakistan. E. tarda was recovered from 147 fish showing symptoms of exophthalmia, hemorrhages, skin depigmentation, ascites, and bacteria-filled nodules in enlarged liver and kidney. Antimicrobial susceptibility testing proved chloramphenicol, ciprofloxacin, and streptomycin effective, but amoxicillin, erythromycin, and flumequine ineffective in controlling edwardsiellosis. Maximum occurrence of qnrA, blaTEM, and sul3 genes of E. tarda was detected in 45% in the liver, 58%, and 42% respectively in the intestine; 46.5%, 67.2%, and 55.9% respectively in O. niloticus; 24%, 36%, and 23% respectively in summer with respect to fish organs, species, and season, respectively. Motility, H2S, indole, methyl red, and glucose tests gave positive results. Overall, E. tarda infected 27.2% of fish, which ultimately caused 7.69% mortality. The Chi-squared test of independence showed a significant difference in the occurrence of ABR genes of E. tarda with respect to sampling sites. In conclusion, the misuse of antibacterial agents has led to the emergence of ABR genes in E. tarda, which in association with high temperatures cause multiple abnormalities in infected fish and ultimately resulting in massive mortality.
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Shahzad, Asif,Rasool, Kashif,Nawaz, Mohsin,Miran, Waheed,Jang, Jiseon,Moztahida, Mokrema,Mahmoud, Khaled A.,Lee, Dae Sung Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.349 No.-
<P><B>Abstract</B></P> <P>A simple hydrothermal treatment process was used for the fabrication of a Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> (MXene) nanosheet-based hybrid photocatalyst. The chemical composition of the MXene and its derivatives (nanosize {0 0 1} facets of TiO<SUB>2</SUB> in Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> (001-T/MX)), as well as the structural properties and morphology of the as-prepared photocatalyst, were well characterised. The heterostructure of the as-prepared photocatalyst was obtained by controlled oxidation action via the Schottky junction formed between TiO<SUB>2</SUB>-MXene interfaces. The adsorption/photocatalytic degradation abilities of the pristine MXene and the as-synthesised 001-T/MX nanocomposite for carbamazepine (CBZ) were investigated. The determined <I>K<SUB>app</SUB> </I> value of CBZ under ultraviolet light was 0.0304 min<SUP>−1</SUP>, higher than that under natural solar light, and the degradation capacity was strongly controlled under acidic conditions (pH 3.0–5.0). During the photocatalytic degradation, <SUP> </SUP>OH and <SUP> </SUP>O<SUB>2</SUB> attacked the CBZ molecule; detailed degradation pathways were proposed accordingly. The novel heterojunction 001-T/MX exhibited excellent applicability for CBZ decomposition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simple hydrothermal process is used for the fabrication of Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> (MXene) nanosheets. </LI> <LI> Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene-based heterojunction (001-T/MX) can be used as a photocatalyst. </LI> <LI> Carbamazepine (CBZ) degradation under direct sunlight and ultraviolet light is studied. </LI> <LI> T/MX photocatalyst degrades 98.67% CBZ under UV light irradiation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Mercuric ion capturing by recoverable titanium carbide magnetic nanocomposite
Shahzad, Asif,Rasool, Kashif,Miran, Waheed,Nawaz, Mohsin,Jang, Jiseon,Mahmoud, Khaled A.,Lee, Dae Sung Elsevier 2018 Journal of hazardous materials Vol.344 No.-
<P><B>Abstract</B></P> <P>Two-dimensional metal carbides and nitrides (MXenes) have attracted increasing attention for application in water/wastewater treatment. The functionalization of MXenes to increase their stability while demonstrating high pollutant removal can facilitate sustainable water/wastewater treatment processes. In this study, the highly stable magnetic titanium carbide (<I>Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB>)</I> MXene nanocomposite (<I>MGMX</I> nanocomposite) was successfully synthesized through a facile hydrothermal approach and was tested for aqueous-phase adsorptive removal of mercuric ions. The synthesized <I>MGMX</I> nanocomposite was studied using characteristic analyses, showing high stability as revealed by zeta-potential analysis and dynamic light-scattering technique. The <I>MGMX</I> nanocomposite presented excellent Hg(II) removal in a wide range of pH conditions, and an exceptional maximum experimental Hg(II) uptake capacity of 1128.41mgg<SUP>−1</SUP> was observed. The adsorption behavior was investigated using the Redlich-Peterson adsorption isotherm, pseudo second-order kinetics, and thermodynamics models. In the adsorption/desorption investigation, the <I>MGMX</I> nanocomposite was reusable for up to five cycles of adsorption/desorption. The stability, hydrophilic nature, available adsorptive surfaces, and easy separation after reaction make the <I>MGMX</I> nanocomposite an efficient sorbent for the removal of toxic Hg(II) for water purification.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hybrid nanocomposites were synthesized using <I>Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> </I> MXene and Fe<SUB>2</SUB>O<SUB>3</SUB> nanoparticles. </LI> <LI> <I>MGMX</I> presented the highest removal capacity for Hg(II) among other 2D materials. </LI> <LI> <I>MGMX</I> adsorbed ∼99.9% Hg(II) in the existence of background metal ions. </LI> <LI> Fe<SUB>2</SUB>O<SUB>3</SUB> nanoparticles in <I>MGMX</I> played a significant role in Hg(II) adsorption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Miran, Waheed,Rasool, Kashif,Nawaz, Mohsin,Kadam, Avinash,Shin, Seolhye,Heo, Jun,Jang, Jiseon,Sung Lee, Dae Taylor Francis 2016 Desalination and Water Treatment Vol.57 No.19
<P>Microbial fuel cells (MFCs) are gaining tremendous interests for achieving simultaneous power production and recalcitrant wastewaters treatment. In this study, simultaneous electricity generation and tetra-azo dye (Direct Red 80) decolorization was examined in a dual chamber MFC. In addition, glucose and various volatile fatty acids were separately examined as co-substrates for anaerobic dye degradation and bioelectricity generation. Maximum power of 477.8 and 455.7mW/m(2) were attained with glucose (1,000mg/L) as a sole carbon source and glucose (1,000mg/L) coupled with dye (200mg/L), respectively. At this glucose and dye initial concentration, 85.8% color and 74.9% COD removal were resulted in 48h batch studies. Color removal without any co-substrate's addition was 23%, indicating dye was degraded mainly in the presence of carbon sources. There was no substantial negative effect in electricity generation was observed with the dye degradation. Dye removal was decreased with the increase in dye initial concentration (25-800mg/L) and increases notably with the increase in initial glucose concentration between 0 and 1,000mg/L, while afterward insignificant effect up to 2,000mg/L was observed. Glucose was determined as better co-substrate followed by acetic, propionic, and lactic acid in terms of dye removal and maximum power production. Gas chromatography-mass spectrometry showed sodium 4-aminoazobenzene-4-sulfonate to be the subsequent metabolites formed during the decolorization of dye. This work demonstrated that MFC could be applied to achieve electricity generation and simultaneous azo dye degradation using glucose as the preferred co-substrate.</P>
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Tran, Hung-Thuan,Kim, Dae-Hee,Oh, Se-Jin,Rasool, Kashif,Park, Doo-Hyun,Zhang, Rui-Hong,Ahn, Dae-Hee IWA Publishing 2009 Water Science & Technology Vol.59 No.9
<P>Simultaneous organics removal and nitrification using a novel nitrifying biocathode microbial fuel cell (MFC) reactor were investigated in this study. Remarkably, the introduction of nitrifying biomass into the cathode chamber caused higher voltage outputs than that of MFC operated with the abiotic cathode. Results showed the maximum power density increased 18% when cathode was run under the biotic condition and fed by nitrifying medium with alkalinity/NH4+-N ratio of 8 (26 against 22 mW/m2). The voltage output was not differentiated when NH4+-N concentration was increased from 50 to 100 mg/L under such alkalinity/NH4+-N ratio. However, interestingly, the cell voltage rose significantly when the alkalinity/NH4+-N ratio was decreased to 6. Consequently, the maximum power density increased 68% in compared with the abiotic cathode MFC (37 against 22 mW/m2). Polarization curves demonstrated that both activation and concentration losses were lowered during the period of nitrifying biocathode operation. Ammonium was totally nitrified and mostly converted to nitrate in all cases of the biotic cathode conditions. High COD removal efficiency (98%) was achieved. In light of the results presented here, the application of nitrifying biocathode is not only able to integrate the nitrogen and carbon removal but also to enhance the power generation in MFC system. Our system can be suggested to open up a new feasible way for upgrading and retrofitting the existing wastewater treatment plant by the use of MFC-based technologies.</P>
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