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    Preparation and evaluation of hydrogel composites based on starch-g-PNaMA/eggshell particles as dye biosorbent

    , Article Desalination and Water Treatment ; Volume 57, Issue 39 , 2016 , Pages 18144-18156 ; 19443994 (ISSN) Bakhshi, H ; Darvishi, A ; Sharif University of Technology
    Taylor and Francis Inc 
    In this study, eggshell (ES) particles as an available and low-cost waste material were used for preparing hydrogel composites as dye biosorbents. For this purpose, hydrogel composites were prepared through free-radical graft copolymerization of wheat starch and sodium methacrylate (NaMA) in the presence of different contents of ES particles with various size ranges. FTIR spectroscopy confirmed graft copolymerization of NaMA moieties onto starch backbone besides the combination of ES particles with the starch-g-PNaMA matrix. The gel content values were high (>99%), which showed proper graft efficiency for hydrogel composites. Incorporation of ES particles into hydrogel matrix resulted in... 

    Analytical study of 226Ra activity concentration in market consuming foodstuffs of ramsar, Iran

    , Article Journal of Environmental Health Science and Engineering ; Volume 15, Issue 1 , 2017 ; 2052336X (ISSN) Gooniband Shooshtari, M ; Deevband, M. R ; Kardan, M. R ; Fathabadi, N ; Salehi, A. A ; Naddafi, K ; Yunesian, M ; Nabizadeh Nodehi, R ; Karimi, M ; Hosseini, S. S ; Sharif University of Technology
    Background: Ramsar, a city of Iran located on the coast of the Caspian Sea, has been considered to be enormously important due to its high natural radioactivity levels. People living in High Level Natural Radiation Areas (HLNRAs) have been exposed by several sources, one of which could be foodstuff. However, many studies have been carried out to measure the environmental radioactivity in Ramsar, but no survey has been conducted in all stapled consumed foods yet. This study was dedicated to determine 226Ra activity concentration in the daily diets of Ramsar residents as a probable exposure. Methods: Approximately 70 different market samples were collected during the four seasons based on the... 

    Thermal conductivity of moist wheat bran beds used in solid state fermentations

    , Article Food and Bioproducts Processing ; Volume 83, Issue 3 C , 2005 , Pages 185-190 ; 09603085 (ISSN) Khanahmadi, M ; Roostaazad, R ; Bozorgmehri, R ; Safekordi, A ; Sharif University of Technology
    Institution of Chemical Engineers  2005
    A mathematical model was introduced to describe the heat transfer behaviour of moist wheat bran beds. Comparison of predicted transient temperature profiles with experimental data collected in a simulated bed was used to evaluate bed thermal conductivity at various conditions. This parameter was correlated with the bed density and moisture content via a mathematical relation. Furthermore, extent of error in thermal conductivity evaluation resulted from neglecting water vapour diffusion was quantified. Results provide useful means to design, analyse, and predict the behaviour of solid state fermenters in a more reliable manner. © 2005 Institution of Chemical Engineers  

    Optimisation of dilute-acid pretreatment conditions forenhancement sugar recovery and enzymatic hydrolysis ofwheat straw

    , Article Biosystems Engineering ; Volume 111, Issue 2 , 2012 , Pages 166-174 ; 15375110 (ISSN) Satari Baboukani, B ; Vossoughi, M ; Alemzadeh, I ; Sharif University of Technology
    In order to produce bioethanol from agricultural residues such as wheat straw, the decomposition lignocellulosic materials into soluble sugars is necessary. This work focused on the influence of dilute sulphuric acid pretreatment conditions on sugar removal and the enzymatic saccharification of wheat straw. Response surface methodology (RSM) based on rotatable central composite design (RCCD) was used to optimise H 2SO 4-catalysed hydrothermal pretreatment of wheat straw, in respect to acid concentration (0.75-2.25%), treatment time (10-30min) and temperature (120-160°C). The pretreated wheat straw was hydrolysed by a standard blend of Cellusoft CR ®. Enzymatic hydrolysis was also measured to... 

    Effect of metal oxide based TiO2 nanoparticles on anaerobic digestion process of lignocellulosic substrate

    , Article Energy ; Volume 191 , 2020 Ghofrani Isfahani, P ; Baniamerian, H ; Tsapekos, P ; Alvarado Morales, M ; Kasama, T ; Shahrokhi, M ; Vossoughi, M ; Angelidaki, I ; Sharif University of Technology
    Elsevier Ltd  2020
    Lignocellulosic materials are recalcitrant to bioconversion, due to their rigid physiochemical structure. In this work, the effects of Fe2O3–TiO2 and NiO–TiO2 nanoparticles (NPs) and FeCl3 and NiCl2 salts, on the anaerobic digestion (AD) of wheat straw have been investigated. For this purpose, metal oxide-TiO2 NPs were synthesized and fully characterized. Results showed that addition of 0.252 mg of NiO–TiO2/g total solids (TS) to batch assays resulted in increase of soluble chemical oxygen demand (COD) and 67% increase in volatile fatty acids (VFAs) concentration compared to control tests during the first 4 days of experiments. These results indicate that hydrolysis and acidogenesis rates... 

    Comparative analysis of agricultural water pricing between Azarbaijan Provinces in Iran and the state of California in the US: A hydro-economic approach

    , Article Agricultural Water Management ; Volume 223 , 2019 ; 03783774 (ISSN) Momeni, M ; Zakeri, Z ; Esfandiari, M ; Behzadian, K ; Zahedi, S ; Razavi, V ; Sharif University of Technology
    Elsevier B.V  2019
    Iranian water authority has recently announced that one of the effective ways to avoid unprecedented high water consumption in Iran's agriculture sector is to increase water price. This paper analyzes the feasibility of this policy by using a hydro-economic approach with the aim to consider the role of water pricing in agricultural water management. Such an analysis was conducted through comparing price of water consumed for producing selected agricultural crops (i.e. wheat, sugar beets, onion, tomato, barley, potato, corn, alfalfa hay and watermelon) in a case study on two provinces (East Azarbaijan and West Azarbaijan) in Iran to that in the state of California (CA) in the USA. According...