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  • Küçük Resim
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    Removal of ciprofloxacin from aqueous solution using wheat bran as adsorbent
    (TAYLOR & FRANCIS INC, 2019) Khokhar, Tahira Sarwar.; Memon, Fakhar N.; Memon, Ayaz Ali.; Durmaz, Fatih.; Memon, Shahabuddin.; Panhwar, Qadeer Khan.; Muneer, Saba.
    Current study describes sorption of antibiotic drug (ciprofloxacin) by using nontoxic and biocompatible carrier, i.e., wheat bran (WB). For sorption study, various parameters were optimized and Freundlich, Dubinin-Radushkevich, Langmuir, and Temkin isotherm models were applied to demonstrate the mechanism of sorption, while kinetics study for sorption was evaluated using diffusion models, pseudo-first-order kinetic (Langergren) and pseudo-second-order (Ho and McKay) kinetic models. In addition, thermodynamics study was also carried out. However, sorption of ciprofloxacin was pH depended and it showed 75% drug release in alkaline medium (at pH = 1.5) indicating the good release ability of WB for ciprofloxacin.
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    Selective online solid-phase extraction of copper using p-morpholino-methylcalix[4]arene appended silica-based column
    (TAYLOR & FRANCIS INC, 2019) Memon, Naeem A.; Memon, Fakhar N.; Kara, Hatice K.; Kara, Hüseyin.; Sherazi, Sayed T. H.; Memon, Ayaz A.; Memon, Shahabuddin.; Leghari, Muhammad K.
    This study deals with investigation of selectivity of p-morpholino-methylcalix[4]arene appended silica from a group of metal ions having similar charge and radii. The values of distribution ratio revealed that modified silica possess higher selectivity for Cu2+. In addition, relative selectivity coefficients of modified silica were found to be 24.1, 13.8, 8.6 and 4.01 for Cu2+/Ni2+, Cu2+/Co2+, Cu2+/Cd2+, Cu2+/Pb2+, respectively. The maximum adsorption capacity was 1.5 mmolg(-1). The reusability data suggested no any loss of adsorption capacity of this material up to 10 cycles. The developed material was also applied for determination of copper in lake water samples with satisfactory results.
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    Synthesis and antimicrobial assessment of Fe3+ inclusion complex of p-tert-Butylcalix[4]arene diamide derivative
    (HINDAWI LTD, 2019) Chandio, Anwar Ali.; Memon, Ayaz Ali.; Memon, Shahabuddin.; Memon, Fakhar N.; Panhwar, Qadeer Khan.; Durmaz, Fatih.; Nizamani, Shafi Muhammad.; Brohi, Nazir Ahmed.
    Present study deals with the synthesis of the p-tert-butylcalix[4]arene diamide derivative as ligand (L) and its Fe3+ complex, followed by its characterization using TLC and FT-IR, while UV-Vis and Job's plot study were performed for complex formation. Antimicrobial activity of the derivative (L) and its metal complex was carried out by the disc diffusion method against bacteria (Escherichia coli and Staphylococcus albus) and fungi (R. stolonifer). Different concentrations of the derivative (L) (6, 3, 1.5, 0.75, and 0.37 mu g/mL) and its Fe3+ complex were prepared, and Mueller-Hinton agar was used as the medium for the growth of microorganisms. Six successive dilutions of the derivative (L) and Fe3+ complex were used against microorganisms. Two successive dilutions (6 and 3 mu g/mL) of the derivative (L) showed antibacterial action against both Gram-positive and Gram-negative bacteria. In addition, three successive dilutions (6, 3, and 1.5 mu g/mL) of the derivative (L) showed antifungal activity. However, all of six dilutions of the Fe3+ complex showed antimicrobial activity. Derivative (L) showed 3 and 1.5g/mL minimum inhibitory concentrations (MIC) against bacteria and fungi, respectively. On the contrary, its Fe3+ complex showed 0.37g/mL value of MIC against bacteria and fungi. Hence, Fe3+ complex of the derivative (L) was found to be a more effective antimicrobial agent against selected bacteria and fungi than the diamide derivative (L).