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- 저자 : Nasir Shezad (검색결과 4 건)
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Maira Shabir,Nasir Shezad,Iqrash Shafiq,Ibrahim M. Maafa,Parveen Akhter,Kshaf Azam,Ashfaq Ahmed,See Hoon Lee,Young-Kwon Park,Murid Hussain 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
A visible-light active N,S-codoped TiO2 incorporated with carbon nanotubes (CNTs) was synthesized by amulticomponent heterojunction scheme. The synthesized photocatalysts was examined by several analysistechniques. The conventional TiO2, N-doped TiO2, TiO2/CNT and N,S-codoped TiO2 were also synthesized,characterized, and integrated adsorptive-photocatalytic degradation rates were subsequentlycompared and assessed, for comparative purposes as reference photocatalysts. The parametric studywas also carried out to investigate the effect of various operational factors, such as solution pH, the photocatalystloading and initial concentration of dye solution, on the adsorptive-photocatalytic performance. The best activity performance was attained with the N,S-TiO2/CNTs nanocomposite due to thesynergistic effect of ternary components caused by the incorporation of dopants and CNTs in TiO2 lattice,providing a high number of adsorption sites and facilitating the effective separation of photogeneratedcharge carriers and minimal recombination rates. N,S-TiO2/CNTs exhibited around three times higherphotocatalytic performance than that of the binary composites, i.e., N-TiO2, TiO2/CNTs, N,S-TiO2, andabout four times higher than the conventional TiO2. Furthermore, the superior nanocomposites were alsoinvestigated for their recyclability for five consecutive cycles.
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Abdul Rahman Abdul Rahim,Khairiraihanna Johari,Nurul Ekmi Rabat,Murid Hussain,Nasir Shezad,Young-Kwon Park 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
In this study, charred–desiccated coconut waste was treated with several chemicals, such as NaOH,NaOCl, H2O2, and HNO3, to prepare chemically modified adsorbents. Fourier transform infrared spectroscopyrevealed that chemical modification enhanced the surface chemistry of the adsorbent by introducingnew functional groups and increasing their concentration. The chemically modified adsorbentshad lower surface areas of 0.13–17.36 m2/g, which were substantially lower than that of the pristineadsorbent. Regardless of the surface area, all modified adsorbents exhibited higher Pb(II) adsorptioncapacities, wherein that of desiccated coconut-waste char (DCWC)-NaOH was the highest, with a removalefficiency of 96% (Q = 29.854 mg/g) for an adsorption time of 1 min. The equilibrium and kinetic data forthe DCWC-NaOH adsorbent best fit the Freundlich isotherm and pseudo-second-order kinetic models,respectively, with a maximum monolayer adsorption capacity of 1666.67 mg/g. The adsorption of Pb(II) ions was an exothermic process, with an optimum temperature of 40 C. Compared to existing commercialadsorbents, the proposed adsorbent was highly regenerable and considerably low-cost, showingpromising potential for commercial applications.
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Parveen Akhter,Iqrash Shafiq,Faisal Ali,Faiza Hassan,Roeya Rehman,Nasir Shezad,Ashfaq Ahmed,Farrukh Jamil,Murid Hussain,Young-Kwon Park 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
Textile effluents may harm the human body as well as cause environmental pollution. For several decadesresearchers have been attempting to overcome this issue by introducing environmentally friendly technologiesthat degrade bulk dyes to mitigate hazards. Synthetic dyes are carcinogenic for humans as wellas for other living organisms. Various techniques have been developed for the removal of these toxiccompounds, advanced oxidation processes (AOPs) being the most used processes. In this study,Montmorillonite (MMT) supported BiVO4 nanocomposite was prepared by the sol–gel method to degradeBrilliant Red 80 dye using photocatalysis. The BiVO4/MMT composite was comprehensively characterizedby several characterization techniques including X-ray diffraction (XRD), Fourier-transform infraredspectroscopy (FTIR), Scanning electron microscopy (SEM), Raman, Photoluminescence spectroscopy(PL), and UV–Vis diffuse reflectance spectroscopy (UV–Vis-DRS). Interestingly, the composite materialshowed a narrow bandgap of 2.26 eV with strong light absorption in the visible range. A 1000-wattXenon Lamp was used for activity performance measurement. The photocatalytic Brilliant Red 80 degradationactivity was observed to be 99% degraded within 120 min of illumination compared to conventionalBiVO4 which showed around 80% degradation. Moreover, in this work, an acidic media wasfound to favor the degradation of Brilliant Red 80 dye.
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Usama Shakeel,Murid Hussain,Rizwan Sheikh,Ashfaq Ahmed,Muhammad Shahid Nazir,Wenshu Yang,Nasir Shezad,Parveen Akhter,박영권 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5
This study aimed at the synthesis of heterogeneous acid catalysts by incorporating 12 tungstophosphoric acid (HPW) over mesoporous silica support KIT-6 via impregnation and sol-gel methods to improve the catalytic efficiency of the esterification reaction. The catalytic activity of the KIT-6 supported catalysts was investigated for esterification of oleic acid in the presence of MeOH. Synthesized catalysts were analyzed using scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Fourier transform infrared (FTIR) spectroscopy techniques. Characterization results showed the variation in porosity, roughness, presence of SiO2 and kegging structure after successful deposition of HPW over KIT-6 surface. Additionally, the textural property of synthesized catalysts was compared with highly active HPW and sulfated KIT-6. The ordered structure of mesoporous silica KIT-6 facilitated the dispersion of HPW resulting in better catalytic stability and activity. To evaluate the impact of synthesizing technique on catalytic activity and effectiveness of heterogeneous acid catalysts, loading of HPW over KIT-6 mesoporous silica was controlled between 10 to 30 wt%. Catalysts synthesized by impregnation and sol-gel methods showed the highest catalytic activity with 30- IM and 25-SG, respectively. The enhanced performance was ascribed to the improved textural property and amount of HPW, which led to higher activity, stability and reusability
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