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Nasib Khan,Idrees Khan,Noor Zada,Khalid Saeed Ibrahim 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
Removal of toxic pollutants such as heavy metals and dyes from water has received great attention due to asignificant decline in the clean water level, worldwide. Herein, we attempted to remove both metals and dyes using a singlematerial. Nylon 66 (nylon) films were prepared and then functionalized with nitric acid. The functionalized nylon 66 (Fnylon)was utilized for the adsorption of copper (II) (Cu(II)) ions from an aqueous solution. The adsorption study revealed theefficient adsorption of Cu (II) ions through F-nylon. Moreover, the adsorption data were fitted to Langmuir, Freundlich, andTemkin isotherms, and the values are best fitted to Langmuir isotherm as compared with Freundlich isotherm. The nylon 66,F-nylon, and Cu/F-nylon were characterized through scanning electron microscopy (SEM), energy dispersive X-ray (EDX),Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). SEM of F-nylon samples showedhighly porous surface and membrane-like appearance that is suitable for the metal adsorption. The EDX analysis confirmedthe overall elemental composition of the adsorbed copper on F-nylon surface. FTIR was helpful to confirm the introductionof new functional groups after modification of nylon, while TGA analysis demonstrated significant thermal stability of allsamples. The copper adsorbed F-nylon 66 (Cu/F-nylon) was further utilized as a photocatalyst for the photodegradation ofEriochrome Black T (EBT) dye. Cu/F-nylon and recovered Cu/F-nylon films degraded about 93 and 89.3 % EBT dye within240 min, respectively. The optimum conditions for EBT photodegradation were pH 6, 0.05 g photocatalyst dosage, and aninitial dye concentration of 60 ppm.
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Tahir Hussain,Uzma Nasib,Fawad Khan,Muhammad Farhan 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.4
In this paper, we classify the Kantowski-Sachs spacetimes via conformal vector fields (CVFs). A Maple algorithm using the `Exterior' package is used to reduce the set of conformal Killing equations to the reduced involutive form (Rif). The algorithm yields a tree, known as the Rif tree, where the branches of the Rif tree give the potential metrics for which the spacetimes under consideration may possess proper CVFs. The set of conformal Killing equations is solved for all the branches of the Rif tree to obtain the explicit forms of CVFs. Some physical implications of the obtained metrics are also discussed.
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