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- 저자 : Ismat Bibi (검색결과 2 건)
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Ismat Bibi,Aneela Sultan,Shagufta Kamal,Shazia Nouren,Yusra Safa,Kashif Jalani,Misbah Sultan,Sadia Atta,Fariha Rehman 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
The current research project has been devoted to isolating new low cost and eco-friendly phenolic compounds from fruit seeds, peels and vegetables to reduce the atmospheric pollution. Natural phenolic compounds were extracted from different fruit seeds and agriculture waste: P. armeniaca, P. persica, P. domestica and Triticum aesativum. The total phenolic content was quantified, and the maximum value (1 mL extract having 1,933 μg) was found in P. armeniaca seed extract. Phytochemical screening showed that P. armeniaca seeds contain higher amount of alkaloid, tannins, saponins and flavonoid. P. armeniaca seeds enhanced the biotransformation of reactive yellow dye up to 69.89% with maximum laccase (322.45 IU/mL) production. Biodegradation of reactive yellow was only 23.34% without natural redox mediator at sixth day of incubation. Use of P. armeniaca seed stimulators resulted in maximum laccase activity (894.4 IU/mL) with 99.5% rate of removal. UV-Vis, HPLC & FTIR analysis confirmed the transformation of parent dye into various new products. Phytotoxicity study indicated 0% germination index of Avena sativa seeds with reactive yellow, whereas 83% germination index having 100% seed germination while 83% root elongation with treated sample. Thus, the study revealed that the natural phenolic compounds could serve as high potential redox mediators for enhanced laccase-mediated decolorization of reactive yellow dye.
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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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