Sana Sadaf - Academia.edu (original) (raw)

Papers by Sana Sadaf

Arabian Journal of Chemistry

Journal of Molecular Modeling

Journal of Materials Research and Technology

Materials Research Express

Industrial Crops and Products

Sustainable Cities and Society

Applied Radiation and Isotopes, 2017

Present study was designed to explore the possibility of Vigna radiata biomass for recovery of ur... more Present study was designed to explore the possibility of Vigna radiata biomass for recovery of uranium ions. Various fundamental process parameters i.e., pH, contact time, temperature and initial uranium ions concentration were optimized and maximum uranium removal (230mg/g) was achieved at pH 4, biosorbent dose 0.05g, contact time 60min contact time and temperature 40°C using 400mg/L uranium ions concentration. The biomass was also pre-treated by different physical and chemical pretreatments to check out their effect on the adsorption capacity. Different kinetic and equilibrium models were applied to the experimental data to understand the uranium adsorption mechanism. Freundlich isotherm and pseudo-second order kinetic model explained well the adsorption of uranium ions onto Vigna radiata biomass. The biomass physical and chemical pretreatments significantly affected the uranium adsorption and CH3COOH 0.15M solution found out to be efficient for de-sorption. FT-IR analysis of native and loaded biomass confirmed the involvement of carbonyl and hydroxyl groups in the uranium adsorption process. The results outcome revealed that Vigna radiata biomass can be used for uranium adsorption in view of low cost and high adsorption efficiency.

Journal Chemical Society of Pakistan, Feb 1, 2014

Pollution control is one of the leading issues of society today. The present study was designed t... more Pollution control is one of the leading issues of society today. The present study was designed to remove the Drimarine Yellow HF-3GL dye from aqueous solutions through biosorption. Sugarcane bagasse was used as biosorbent in native, acetic acid treated and immobilized form. Batch study was conducted to optimize different system variables like pH of solution, medium temperature, biosorbent concentration, initial dye concentration and contact time. Maximum dye removal was observed at pH 2, biosorbent dose of 0.05 g/50 mL and 40°C temperature. The equilibrium was achieved in 45-90 min. Different kinetic and equilibrium models were applied to the experimental results. The biosorption kinetic data was found to follow the pseudo second order kinetic model. Freundlich adsorption isotherm model showed a better fitness to the equilibrium data. The value of Gibbs free energy revealed that biosorption of Drimarine Yellow HF-3GL dye by native and pretreated sugarcane bagasse was a spontaneous process. Presence of salt and heavy metal ions in aqueous solution enhanced the biosorption capacity while presence of surfactants decreased the biosorption potential of biosorbent. Dye was desorbed by 1M NaOH solution. Fixed bed column study of Drimarine Yellow HF-3GL was carried out to optimize different parameters like bed height, flow rate and initial dye concentration. It was observed that biosorption capacity increases with increase in initial dye concentration and bed height but decreases with the increase in flow rate. The data of column study was explained very well by BDST model. FT-IR analysis confirmed the involvement of various functional groups, mainly hydroxyl, carboxyl and amine groups. The results proved that sugarcane bagasse waste biomass can be used as a favorable biosorbent for the removal of dyes from aqueous solutions.

Journal of Environmental Chemical Engineering, 2016

Chemosphere, 2017

Citrus limon peroxidase mediated decolourization of Direct Yellow 4 (DY4) was investigated. The p... more Citrus limon peroxidase mediated decolourization of Direct Yellow 4 (DY4) was investigated. The process variables (pH, temperature, incubation time, enzyme dose, H2O2 amount, dye concentration, co-metal ions and surfactants) were optimized for maximum degradation of dye. Maximum dye decolourization of 89.47% was achieved at pH 5.0, temperature 50 °C, enzyme dose 24 U/mL, H2O2 concentration 0.25 mM and DY4 concentration 18.75 mg/L and incubation time 10 min. The co-metal ions and surfactants did not affect the dye decolourization significantly. Response surface analysis revealed that predicted values were in agreement with experimentally determined responses. The degradation products were identified by UPLC/MS analysis and degradation pathway was proposed. Besides, phytotoxicity assay revealed a considerable detoxification in response of biodegradation of DY4 dye. C. limon showed promising efficiency for DY4 degradation and could possibly be used for the remediation of textile effluents.

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ABSTRACT The present work describes the removal of Novacron Golden Yellow (NGY) dye from aqueous ... more ABSTRACT The present work describes the removal of Novacron Golden Yellow (NGY) dye from aqueous solutions using peanut hulls. The experiments were performed with native, pretreated and immobilised forms of peanut hulls. The effect of various operational parameters (pH, biosorbent dose, initial dye concentration and temperature etc.) was explored during batch study. NGY showed maximum removal at low pH and low biosorbent dose. High initial dye concentration facilitated the biosorption process. Maximum dye removal with native, pretreated and immobilised biomass was found to be 35.7, 36.4 and 15.02 mg/g respectively. The experimental data were subjected to different kinetic and equilibrium models. The kinetic data confirmed the fitness of pseudo-second-order rate lawforNGYbiosorption. The equilibrium modelling was carried out by Freundlich, Langmuir and Temkin models. The isothermal data of NGY removal were best described by Freundlich adsorption isotherm. Negative values of Free energy change (�G0) for NGY with native and pretreated biomass depicted the spontaneous nature of biosorption process. In column mode, the effects of bed height, flow rate and initial dye concentrations were optimised. Maximum NGY biosorption (7.28 mg/g) was observed with high bed height, low flow rate and high initial concentration in continuous mode. Bohart–Adams model best fitted to the data obtained from column studies. The results indicated that the peanut hulls could be used effectively for the removal of dyes containing wastewater.

Journal Chemical Society of Pakistan, Oct 1, 2009

ABSTRACT The present study describes the chemical composition, antibacterial, antifungal and anti... more ABSTRACT The present study describes the chemical composition, antibacterial, antifungal and antioxidant activities of essential oils isolated by steam distillation from the aerial parts and roots of the Tunisian Matricaria aurea Loefl. The chemical composition of essential oils was analyzed by gas chromatography/mass spectrometry (GC-MS). 105 components were identified, of which 1,5 bis (dicyclohexylphosphino)-pentane (44.7 %) was the main compound in leaves. These oils were subjected to screening for their possible antioxidant activities by using the ABTS (2,2'-azinobis(3-ethylbenzothiazoline-6-sulphonic acid) and DPPH (2,2-diphenyl-1-picrylhydrazyl radical) methods and compared to the synthetic antioxidant Trolox. The inhibitory activity of M. aurea Loefl. essential oils against Gram-positive bacteria was significantly higher than against Gram-negative ones, Both pathogenic yeasts Candida albicans ATCC 9008 and Candida parapsilosis CECT 13009 were all resistant to the tested oils. Our results demonstrate that the essential oils of M. aurea possessing antioxidant and antimicrobial activities might be a natural potential source of preservative used in food and other allied industries.

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