Browsing by Author "AQSA"

Now showing 1 - 4 of 4
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    Evaluation of Azo dyes biodegradation potential of bacteria for textile waste effluents treatment
    (UMT Lahore, 2024-04-08) MUHAMMAD AOURANGZAIB; NIMRA QAZAFI; AQSA
    Azo dyes are known to have toxic and carcinogenic properties, affecting aquatic life and human beings. Consequently, it is essential to remove this pollutant from wastewater intended for discharge into water bodies. The current research study aimed to isolate, characterize, and screen bacterial species from textile waste effluent samples and to explore the efficacy of these isolates for Azo dye bioremediation in achieving SDG targets related to clean water and sanitation (SDG 6). Pretreatment of the samples and subsequent culturing were carried out with the following procedure. The morphological characteristics of the isolates were identified by exploiting the Gram staining technique and microscopy along with a series of biochemical assays were accomplished including citrate, coagulase, catalase, urease, oxidase, triple sugar iodine (TSI), motility test, etc. that led to the identification of Bacillus and Corynebacterium species. The degradation capacity of the isolated bacterial species was assessed over one week through the analytical method UV spectroscopy via utilizing various azo dyes as substrates. The findings revealed that both Bacillus and Corynebacterium isolates exhibited notable degradation capabilities. The quantitative analysis divulged that Bacillus species exhibited an impressive 82% degradation of the Sirius Orange KCF dye. Similarly, Corynebacterium displayed a significant degradation of Indosol Orange RSN dye up to 70% within the period of one week. In addition, statistical analysis was done using regression to assess the importance of these findings. The current study’s high breakdown percentages indicated that Bacillus and Corynebacterium bacterial species have the potential to be used for the bioremediation process of these dyes. This could lead to more environmentally friendly and cost-effective approaches for treating textile dye wastewater.
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    Exploration of collocation in news reporting of economic instability in Pakistani newspapers editorials
    (UMT.Lahore, 2024) AQSA
    This study observes collocations in the editorials of major Pakistani newspapers, specifically Dawn, from 2022 to 2024, focusing on the discussion of economic instability. The research analyses how journalists apply specific word combinations to describe economic challenges in Pakistan. By investigating these collocations, this qualitative study revealed patterns reflecting editorial perspectives and influencing readers' understanding of economic issues. The study's findings explain the relationship between language and media discourse on economic instability, highlighting how language choices can shape public perception and policy responses.
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    Green and chemical synthesis of cadmium selenide nanoparticles and their applications
    (UMT, Lhr, 2021) AQSA
    Water pollution caused by antibiotic drugs leads to various environmental problems. It affects not only to those who consume contaminated water, but also to aquatic life and other living organisms. Ciprofloxacin is globally used antibiotic for treating humans as well as animals, but its degradation is difficult which leads to its accumulation in water resources. Various methods of degradation exist but among all most effective and cost-efficient method is photocatalysis, which use sunlight or UVradiations to initiate the degradation of drug/dye by generation of electron-hole pair over the surface of photocatalyst. Cadmium selenide semiconductor nanoparticles were synthesized by chemical and biosynthetic routes, using sol-gel method. The fabricated cadmium selenide nanoparticles had size ranges from 9-12nm, measured by the scanning electron microscopy. The shape of nanoparticles obtained by scanning electron microscopy were globular for chemically synthesized nanoparticles while, for green synthesized nanoparticles it gave distorted tubular shape. The elemental composition and crystal structures of nanoparticles were studied by the energy dispersive X-ray spectroscopy and X-ray diffraction analysis, respectively. The spectra obtained by energy-dispersive X-ray spectroscopy confirmed the formation of required nanoparticles with 36.71% percentage composition of cadmium and 20.61% of selenium for chemically synthesized nanoparticles, and 63% and 0.91% percentage composition of cadmium and selenium for green synthesized nanoparticles. The X-ray diffraction spectra gave crystal structure of fabricated nanoparticles with preferential axis of (101) and (002) planes for chemically and green synthesized nanoparticles, respectively. On degrading ciprofloxacin via fabricated nanoparticles of cadmium selenide, under irradiation of UV-lamp, chemical equilibrium attained at 120min for nanoparticles of both routes, and gave maximum degradation percentage of 46% at 120min under UV-lamp via chemically synthesized nanoparticles. This showed pristine nanoparticles of cadmium selenide had good potential for drug degradation, can enhance further from 46% via doping with other metallic nanoparticles. Appropriate modification of nanoparticles can enhance its efficiency for wastewater treatment at larger scale with better photocatalytic degradation.
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    Green and chemical synthesis of cadmium selenide nanoparticles and their applications
    (UMT, Lhr, 2022) AQSA
    Water pollution caused by antibiotic drugs leads to various environmental problems. It affects not only to those who consume contaminated water, but also to aquatic life and other living organisms. Ciprofloxacin is globally used antibiotic for treating humans as well as animals, but its degradation is difficult which leads to its accumulation in water resources. Various methods of degradation exist but among all most effective and cost-efficient method is photocatalysis, which use sunlight or UVradiations to initiate the degradation of drug/dye by generation of electron-hole pair over the surface of photocatalyst. Cadmium selenide semiconductor nanoparticles were synthesized by chemical and biosynthetic routes, using sol-gel method. The fabricated cadmium selenide nanoparticles had size ranges from 9-12nm, measured by the scanning electron microscopy. The shape of nanoparticles obtained by scanning electron microscopy were globular for chemically synthesized nanoparticles while, for green synthesized nanoparticles it gave distorted tubular shape. The elemental composition and crystal structures of nanoparticles were studied by the energy dispersive X-ray spectroscopy and X-ray diffraction analysis, respectively. The spectra obtained by energy-dispersive X-ray spectroscopy confirmed the formation of required nanoparticles with 36.71% percentage composition of cadmium and 20.61% of selenium for chemically synthesized nanoparticles, and 63% and 0.91% percentage composition of cadmium and selenium for green synthesized nanoparticles. The X-ray diffraction spectra gave crystal structure of fabricated nanoparticles with preferential axis of (101) and (002) planes for chemically and green synthesized nanoparticles, respectively. On degrading ciprofloxacin via fabricated nanoparticles of cadmium selenide, under irradiation of UV-lamp, chemical equilibrium attained at 120min for nanoparticles of both routes, and gave maximum degradation percentage of 46% at 120min under UV-lamp via chemically synthesized nanoparticles. This showed pristine nanoparticles of cadmium selenide had good potential for drug degradation, can enhance further from 46% via doping with other metallic nanoparticles. Appropriate modification of nanoparticles can enhance its efficiency for wastewater treatment at larger scale with better photocatalytic degradation.