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- 저자 : Munawar Iqbal (검색결과 3 건)
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Munawar Tauseef,Bashir Ambreen,Mukhtar Faisal,Nadeem Muhammad Shahid,Manzoor Sumaira,Ashiq Muhammad Naeem,Khan Shoukat Alim,Koc Muammer,Iqbal Faisal 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.6
One of the main goals of energy conversion research is to develop effi cient, nonprecious, and stable electrocatalysts to replace defi cient and unstable noble metal catalysts. Hence, this work described metal–organic frameworks (MOFs) derived ZnO/C hybrid via a hydrothermal route grown on the surface of conducting stainless steel substrate (SS). By using multiple physical techniques (XRD, FTIR, TEM, XPS, and EDX), we compared structural and morphological properties of ZnO/C hybrid and MOF-5 electrodes. The electrocatalytic behaviour of amiable and economical ZnO/C/SS catalyst was noticed in catalyzing oxygen evolution reaction (OER) in one mole KOH electrolyzer with low overpotential and excellent stability. Cyclic sweep voltammetry indicated that the ZnO/C/SS hybrid only needs an ultralow overpotential of 282 mV to achieve a current density of 10 mA cm −1 for OER. In addition, ZnO/C/SS with a low Tafel slope of 39.3 mV/dec and higher 0.29 s −1 turnover frequency can serve as a profi cient electrocatalyst compared to commercial ZnO and MOF-5 electrodes. The stability of ZnO/C/SS hybrid electrocatalyst approaching minor chronoamperometric degradation after 55 h. The electrochemical response depicts that the successful synthesis of MOF-derived ZnO/C/SS catalyst provided abundant active centers and boosted an electron- rich environment to promote its future prosperity and facilitate practical applications for electrochemical water-splitting.
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Biosorption of Pb(II) onto immobilized and native Mangifera indica waste biomass
Raziya Nadeem,Qaisar Manzoor,Munawar Iqbal,Jan Nisar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
The removal of Pb(II) from simulated solution and wastewater using native and immobilized Mangiferaindica biomass (MIB) were studied as a function of pH, initial concentration, biosorbent dose and contacttime. The biosorption data was analyzed using pseudo-first and pseudo-second order kinetic models andLangmuir, Freundlich and Temkin isotherms. The immobilized biomass did not show promisingefficiency for the adsorption of Pb(II) as compared to native biomass. The SEM and EDX analysisconfirmed the Pb(II) adsorption onto MIB. FTIR and desorption studies were also performed. TheLangmuir model and pseudo-second order kinetic fitted well to the adsorption experimental data.
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Qasim Raza,Ismat Bibi,Farzana Majid,Shagufta Kamal,Sadia Ata,Aamir Ghafoor,Muhammad I. Arshad,Samiah H. Al-Mijalli,Arif Nazir,Munawar Iqbal 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
The SrBixAlxFe12-2xO19 (x = 0.0–1.0) nano-hexaferrites were prepared via facile micro-emulsion methodand ferroelectric, dielectric, magnetic, photocatalytic and antibacterial properties were investigatedbased on doping contacts. The XRD analysis confirmed the hexagonal single-phase material with P63/mmc space group. P-E loops indicated the higher polarization and coercivity values for doped materials. VSM results showed that maximum and remnant magnetizations were quite high for undoped materialwhile coercivity was low than doped hexaferrite. Optical band gap was reduced to 1.63 eV from 2 eV(pristine) for highly doped composition. PL intensity showed a sharp decline with doping, which indicatedthe better inhibition of charge carriers on doping. The photo-catalytic activity of pristine and thedoped SrBixAlxFe12-2xO19 was investigated using Crystal Violet and Rhodamine B dyes under solar irradiation. SrAlxBixFe12-2xO19 (x = 1.0) exhibited improved catalytic efficiency and up to 83 and 86 (%) removalof CV and RhB dyes with rate constant of 0.047 and 0.048 (min1), respectively. Highly doped ferrite alsoshowed enhanced bactericidal action against S. aureus and E. coli strains. Superior mineralization of textiledyes and good antimicrobial activity of Bi and Al doped strontium nano-hexaferrites make such materialas crucial candidate for solar light responsive photocatalytic and antimicrobial applications.
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