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- 저자 : Khalid Saeed Ibrahim (검색결과 3 건)
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Carbon nanotubes-properties and applications: a review
Khalid Saeed Ibrahim 한국탄소학회 2013 Carbon Letters Vol.14 No.3
The carbon nanotube (CNT) represents one of the most unique inventions in the field of nanotechnology. CNTs have been studied closely over the last two decades by many researchers around the world due to their great potential in different fields. CNTs are rolled graphene with SP2 hybridization. The important aspects of CNTs are their light weight, small size with a high aspect ratio, good tensile strength, and good conducting characteristics, which make them useful as fillers in different materials such as polymers, metallic surfaces and ceramics. CNTs also have potential applications in the field of nanotechnology, nanomedicine, transistors, actuators, sensors, membranes, and capacitors. There are various techniques which can be used for the synthesis of CNTs. These include the arc-discharge method, chemical vaporize deposition (CVD), the laser ablation method, and the sol gel method. CNTs can be single-walled, double-walled and multi-walled. CNTs have unique mechanical, electrical and optical properties, all of which have been extensively studied. The present review is focused on the synthesis, functionalization, properties and applications of CNTs. The toxic effect of CNTs is also presented in a summarized form.
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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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Hamayun Khan,Abdul Kabir Khalil,Adnan Khan,Khalid Saeed Ibrahim,Nauman Ali 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
Three different chitosan conjugated magnetic nanoparticles (CCMN) of Co, Ni and Fe were prepared using co-precipitation method. The prepared CCMN were characterized by scanning electron microscopy (SEM), Xray diffraction (XRD) and Fourier transform infra-red (FT-IR) spectroscopic techniques. The SEM results showed a smooth surface morphology with almost uniform particle size and irregular shape structure for all CCMN. The XRD study revealed the crystalline structure in case of Co-CCMN and Ni-CCMN, while amorphous nature of Fe-CCMN was observed. The particle size of the prepared CCMN was found to be <95 nm, as confirmed from SEM and XRD analyses. Similarly, FT-IR analysis showed the incorporation and conjugation of Co, Ni and Fe magnetic nanoparticles into the chitosan polymer matrix. The point of zero charge (PZC) was found to be 7.41 for Co-CCMN and Ni-CCMN and 7.70 for Fe-CCMN. The photocatalytic activity of the prepared CCMN was investigated under UV light irradiation (254 nm and 15 W) in the aqueous medium using bromophenol blue (BPB). The photocatalytic process was monitored by UV-visible spectrophotometer for different irradiation times (0 to 10 h). The results showed that all the prepared CCMN displayed good to excellent photocatalytic property where the highest degradation was exhibited by Fe-CCMN (94.5%), followed by Co-CCMN (85.1%) and Ni-CCMN (83.0%). The prepared catalysts were recycled and reused, maintaining good photocatalytic activity for four consecutive batches.
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