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    Biological activated carbon process for biotransformation of azo dye Carmoisine by Klebsiella spp

    , Article Environmental Technology (United Kingdom) ; 2021 ; 09593330 (ISSN) Poorasadollah, D ; Bagheri Lotfabad, T ; Heydarinasab, A ; Yaghmaei, S ; Mohseni, F. A ; Sharif University of Technology
    Taylor and Francis Ltd  2021
    The feasibility of employing the biological activated carbon (BAC) process to debilitate azo dye Carmoisine by Klebsiella spp. was investigated. Plate assay revealed the capability of Klebsiella spp. for removal of Carmoisine via degradation. Kinetic parameters were measured for Carmoisine debilitation by Klebsiella spp. using the suspended anaerobic process. Two types of granular and rod-shaped activated carbon were used to form the biological beds in order to study the Carmoisine debilitation in batch processes. Scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) were used to indicate the colonization and biofilm formation of bacteria grown on activated carbon... 

    Modeling and preparation of activated carbon for methane storage I. modeling of activated carbon characteristics with neural networks and response surface method

    , Article Energy Conversion and Management ; Volume 49, Issue 9 , September , 2008 , Pages 2471-2477 ; 01968904 (ISSN) Namvar Asl, M ; Soltanieh, M ; Rashidi, A ; Irandoukht, A ; Sharif University of Technology
    Numerous methods have been proposed previously to describe the characterization of porous materials; however, no well-developed theory is still available. Three different modeling methods were employed in this study to explore the relationship between the characterization parameters of activated carbon (AC) and its methane uptake. The first and the second methods were based on the Radial Basis Function (R.B.F) neural networks. At the first R.B.F. modeling, the neural networks algorithm was designed using the Gaussian function. The collected data for modeling were divided into two parts; (i) the data used for training the network and (ii) the data used for testing the predicted network. At... 

    Experimental Studies for Construction of a Microbial Fuel Cell (MFC) in Continuous Flow Mode

    , M.Sc. Thesis Sharif University of Technology Sadeghi Haskoo, Mohammad Amin (Author) ; Vossoughi, Manoochehr (Supervisor) ; Aalemzadeh, Iran (Supervisor)
    In this research performance of microbial fuel cells (MFCs) in continuous flow mode was studied. Different anodic chambers were tested and it was found that granular activated carbons (GACs) produced the highest power density (1228 mW/m3) in comparison with multiple anodes (731 mW/m3), single anode (294 mW/m3) and polymeric packings (40 mW/m3). It was also shown that in a plug-anodic chamber (PAC) the power output is reduced by reducing agitation of anodic volume. Adding more GACs to anodic chamber results in power increase, however by increasing occupied volume from 80% to 100% the power increase was negligible in result of cathodic reactions limitations. Feed flowrate was increased from... 

    Recovery of Platinum and Palladium from Waste Catalysts of Petroleum Industry

    , M.Sc. Thesis Sharif University of Technology Asadzadeh, Mojtaba (Author) ; Sajadi, Ali Akbar (Supervisor) ; Matloubi Moghadam, Firouz (Supervisor)
    The petroleum industry is one of the technological applications which more platinum-group metals (PGM) employs. Therefore, the recovery of the PGMs from the waste catalysts of petroleum industry could be an important source to obtain these precious metals, with economic and environmental consequences.
    In this work, the recovery of platinum and palladium from petroleum catalysts has been studied using waste RG-582 and LD-265 catalysts. Both catalyst were characterized through XRF, XRD and AAS. Aqua regia used as a leaching agent and The effect of dissolution temperature and time, liquid/ solid ratio (L/S), size of particles and elimination of coke was investigated. Under optimized... 

    Feasibility Study of Using Nutshell Filters Enriched with Potassium Hydroxide for Chromium Removal

    , M.Sc. Thesis Sharif University of Technology Hosseini Taleghani, Ali (Author) ; Borghei, Mehdi (Supervisor)
    Activated Carbon as a highly efficient and low price absorbent has manifold functions in separation and absorption processes in liquid or gas phases. These applications in liquid phase include bleaching in sugar syrup, water and wastewater treatment and in gas phase utilizing them in gas masks and solvent recycling process. Wide variety of base materials could be used to produce activated carbon. For instance rare cellulose materials -wood, coconut shell, Pyrenees and agricultural wastes-, carbon materials-coal, petroleum coke, tar- and polymer materials- tires and plastics wastes- could be mentioned. In this thesis, feasibility of producing activated carbon based on using walnut, almond... 

    Monitoring of Chemical Elements and Cane Juice Impurities and the Effect on Raw Sugar Waste Agro- Industry Hakim Farbi

    , M.Sc. Thesis Sharif University of Technology Mohammadiyan Fard, Ziba (Author) ; Matloubi Moghaddam, Firouz (Supervisor) ; Alamolhoda, Ali Asghar (Co-Advisor)
    Cane sugar impurities cause reduse production sugar in cane sugar industry.These impurities include polysaccharide for example starch, dextran and inorganic ash constituent such as potassium, sodium calcium magnesium and silica .The amount of impurities in the cane sugar depend on many factors including variety , grooving conditions and regional climate. Removal of impurities from cane sugar juice by clarification is an essential part of process of raw sugar manufacture. This process is based on the addition of lime, phosphates and polyelectrolyte. In this study effect of the amount of lime, phosphates and poly electrolyte on removal of various impurities has been investigated.In addition... 

    Design and Construction the Low Cost Catalyst for Removal of VOCs from Air

    , M.Sc. Thesis Sharif University of Technology Fahimirad, Mahdi (Author) ; Shaygan Salek, Jalaloddin (Supervisor)
    Nowadays, increased pollutants in the air threat the society health condition and Volatile Organic Compounds (VOCs) are the most hazardous ones among them. In the present study, catalytic oxidation as a prominent of the VOCs removal method from air, have attracted attentions due to high removal efficiency and suitable kinetic reaction. Because of its common industrial applications, toluene is intended to be eliminated through a low cost carbon supported catalyst which is synthesised in the laboratory. Construction method, carbonaceous support type, catalyst metal and its load, calcination temperature and time are among influencing design characteristics. A combination of Impregnation and... 

    Synthesis and Characterization of TiO2 Based on Carbon (Activated Carbon and Carbon Nanotube) and Investigation of its Catalytic Activity on Environmental Pollutions

    , M.Sc. Thesis Sharif University of Technology Zarezade, Mitra (Author) ; Gholami, Mohammad Reza (Supervisor)
    Pure NanoParticles of TiO2 and Nanocomposite catalysts of TiO2 , activated carbon (TiO2/AC) and multi-walled carbon nanotube (TiO2/MWCNT) were prepared by a sol –Gel method using TetraisoPropylorthotitanat (Tipt) as a precursor. The catalysts were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance uv-vis spectroscopy (DRS) and N2 adsorption – desorption measurements. The photoactivity of samples was evaluated by Acid Blue 92 (AB 92) degradation. The analysis results show that compared with pure Nanoparticles of TiO2, the spherical – shaped TiO2 particles are well – dispersed in TiO2/AC. In TiO2/MWCNT, the coating has special mechanism that... 

    Synthesis of Hybrid Nano-Adsorbent for CO2 Adsorption

    , M.Sc. Thesis Sharif University of Technology Pourrangbar, Mohammad (Author) ; Molaei Dehkordi, Asghar (Supervisor) ; Rashidi, Ali Moradi (Supervisor)
    CO2 as a green house gas plays a significant role in the global warming and weather changes. Absorption by means of amine solutions is the main industrial technique for separating of CO2 from gas mixtures. Hazards associated with high temperature during solvent recovery, large size of equipment, corrosion, solvent degradation, and other reasons has made researchers to look for alternative processes such as adsorption. The aim of this study was to synthesis and modify the nano adsorbent for CO2 capture. To fulfill this purpose, various nano silica structures were synthesized and the amount of adsorption of each sample was determined. To investigate the performance capability nano_adsorbents,... 

    Methane Adsorption on Activated Carbon Prepared from Lignocellulosic Materials

    , M.Sc. Thesis Sharif University of Technology Zaroudi, Maryam (Author) ; Kazemeini, Mohammad (Supervisor) ; Bozorgzadeh, Hamid Reza (Supervisor)
    One of the methods for adsorption of natural gas that has economical, operational and environmental preferences as an alternative energy source is storage as an adsorbed phase in porous material. ANG is superior to CNG and LNG technologies in terms of economy and safety. Carbonaceous nanostructures with pore diameter of 0.8-1.4 nm can be proper adsorbents for methane adsorption. In this work, cellulose and lignin which form lignocellulosic material’s structure, has been used as precursor for producing activated carbon. The activated carbon prepared has been used as adsorbent for adsorption of methane. The use of hydrothermal pretreatment followed by carbonization and chemical activation is... 

    Experimental Investigation of the Effective Parameters on the Removal of the Heavy Metal Ions from Salty Water by Using the Magnetic Nanoparticles Supported on Activated Carbons

    , Ph.D. Dissertation Sharif University of Technology Fatehi , Mohammad Hossein (Author) ; Shayegan, Jalaloddin (Supervisor) ; Goodarznia, Iraj (Supervisor) ; Zabihi, Mohammad (Co-Supervisor)
    In the present thesis, the adsorption ability of the functionalized magnetic nano-particles supported on the walnut and almond based activated carbons was evaluated to prepare the efficient and low cost adsorbents for removal of Pb(II), Cr(VI) and Hg(II) ions aqueous solutions in the presence of salinity. The activated carbons were derived from almond and walnut shell by the physical activation method. The functionalized nano-magnetic activated carbons were synthesized by co-precipitation consisting of AC(almond)@Fe3O4@SiO2-NH2-COOH and AC(walnut)@Fe3O4-NH2-COOH which were modified by the oxygen containing functional groups to enhance the adsorption capacity. The prepared carbonaceous... 

    Study On the Adsorption of Heavy Metals by Poly-Aniline Polymer

    , M.Sc. Thesis Sharif University of Technology Hashtochahar, Soode (Author) ; Borghei, Mehdi (Supervisor)
    Heavy metals such as lead, chromium, nickel are considered as environmental pollutants. These substances are highly toxic and dangerous to humans and other organisms at low concentrations and many problems are caused by them. Chromium belongs to the group of heavy and toxic metals. Form 6-valent chromium for humans is considered a definite carcinogen and also creates other problems. One common method of chromium removal is chemical precipitation which caused a large volume of waste. Other methods such as ion exchange, solvent extraction, reverse osmosis and biological methods are used to remove chromium. Adsorption is another effective method with very few disadvantages compared to other... 

    Silver Nanowaste Reduction and Recycling by Combination of Physical and Chemical Seperation Methods

    , M.Sc. Thesis Sharif University of Technology Sabetghadam, Afzal (Author) ; Hormozi Nezhad, Mohammad Reza (Supervisor) ; Sajjadi, Ali Akbar (Supervisor)
    The increasing utilization of silver nanoparticles (Ag-NPs) in industrial and consumer products has raised concern to wastewater treatment utilities, due to its antimicrobial activity. In this research, recovery of silver nanoparticles from wastewater via using activated carbon and convert it into usable nanoparticles is presented. real waste of silver nanoparticles have been used and activated carbon as adsorbent has a high absorption recovery for silver. Under the optimized experimental parameters e.g. pH, temperature, time of process, and amount of activated carbon, an absorption maximum was achieved and over than 99% of silver nanoparticles can be removed from wastewater. After the... 

    Synthesis, Evaluation and Modification of Suitable Metal–Organic Frameworks (MOFS) for Desulfurization of Hydrocarbon Cuts

    , M.Sc. Thesis Sharif University of Technology Ghassa, Mahya (Author) ; Khorashe, Farhad (Supervisor) ; Hajjar, Zeinab (Co-Supervisor) ; Soltanali, Saeed (Co-Supervisor)
    During fuel combustion, aromatic sulfur compounds in energy fuels convert into sulfur oxides, which cause major environmental problems such as acidic rain, global warming, and air pollution. Absorption desulfurization is one of the promising and economical methods to remove these sulfur compounds from fuels. Metal-organic frameworks (MOFs) are a class of nanoporous materials that are of interest for use as adsorbents due to their high specific surface area, unique surface adsorption properties, high adsorption capacity, tunable porosity, flexible dynamic behavior, and diversity in functional and metal groups. In this research, we first synthesized five metal-organic frameworks, namely... 

    Simulation of biofilter used for removal of air contaminants (ethanol)

    , Article International Journal of Environmental Science and Technology ; Volume 2, Issue 1 , 2005 , Pages 69-82 ; 17351472 (ISSN) Ardjmand, M ; Safekordi, A ; Farjadfard, S ; Sharif University of Technology
    CEERS  2005
    Mathematic modeling and simulation of a biofilter system was developed for biofilters filled by three different packing materials such as granular activated carbon (GAC), compost mixed with diatomaceous earth (DE), and compost, respectively, and the effects of biofilter length, packing material, biological activity and the operation time of system on the removal of ethanol (influent contaminant) were studied. The mathematical model for analysis of mass transport phenomena in the biofilter was solved using a two-step, explicit finite difference approximation technique and computer simulation was carried out. The obtained results show that at the early stage of biofiltration the dominant... 

    Nanoporous composites of activated carbon-metal organic frameworks for organic dye adsorption: Synthesis, adsorption mechanism and kinetics studies

    , Article Journal of Industrial and Engineering Chemistry ; Volume 81 , 2020 , Pages 405-414 Hasanzadeh, M ; Simchi, A ; Shahriyari Far, H ; Sharif University of Technology
    Korean Society of Industrial Engineering Chemistry  2020
    Activated carbon (AC) is an inert adsorbent material that has widely been used in water treatment or removing of environmental pollutants from water. In order to improve the adsorption of AC, which highly depends on its pore size and surface area, we prepared highly porous adsorbent composites of activated carbon (AC)/chromium-based MOF (MIL-101(Cr)). The composite has a high specific surface area of 2440 m2 g−1 and total pore volume of 1.27 cm3 g−1. To show the efficiency of the composite as an adsorbent, the removal kinetics of anionic dyes (Direct Red 31 and Acid Blue 92) from aqueous solutions dependent on the amount of composite, adsorption time, concentration of dye and pH is... 

    Oxidation-precipitation of magnetic Fe3O4/AC nanocomposite as a heterogeneous catalyst for electro-Fenton treatment

    , Article Chemical Engineering Communications ; Volume 207, Issue 5 , 2020 , Pages 665-675 Nazari, P ; Askari, N ; Rahman Setayesh, S ; Sharif University of Technology
    Taylor and Francis Ltd  2020
    The oxidation-precipitation method was used for the synthesis of Fe3O4/AC. The characterization of the catalyst was accomplished by XRD, FT-IR, FE-SEM, BET, and VSM techniques. The obtained results indicated that magnetite nanoparticles were successfully prepared with cubic spinel structures and uniform distribution on the surface of activated carbon by the oxidation-precipitation method. The effect of operating parameters was evaluated to determine the optimum operating condition for the electro-Fenton (EF) removal of catechol as a phenolic pollutant model. At the optimum operating conditions (pH 3, Fe3O4/AC: 0.9 g L−1, Catechol: 8.0 × 10−4mol L−1 at I: 120 mA), the catechol and COD removal... 

    Enhancement of biological nitrogen removal performance using novel carriers based on the recycling of waste materials

    , Article Water Research ; Volume 170 , March , 2020 Massoompour, A. R ; Borghei, S. M ; Raie, M ; Sharif University of Technology
    Elsevier Ltd  2020
    This study aims to enhance biological nitrogen removal performance by the innovative carbon-based carriers. The new carriers were produced based on recycling waste materials. In these carriers, the advantages of the hybrid system and physicochemical properties of activated carbon were integrated to promote microbial attachment. To verify the performance of the new carriers compared to the conventional moving carriers, the experiments were conducted in two parallel laboratory-scale sequencing batch reactors under various operating conditions. The analysis revealed that the specific surface area of the new carrier with a total pore volume of 0.0015cm3/gr was 10.9 times the specific surface... 

    Study of the MBR System for the Removal of Ethyl Benzene and Styrene from Petrochemical Wastewater and Process Optimization by Reducing Membrane Fouling

    , Ph.D. Dissertation Sharif University of Technology Hazrati, Hossein (Author) ; Shayegan, Jalaloddin (Supervisor)
    In this thesis was investigated the effect of solid retention time (SRT), Hydraulic retention time (HRT), activated carbon and suspended carrier on styrene and ethylbenzene biological removal and also on membrane fouling. In addition to the typical analysis (COD, MLSS, MLVSS, and SVI), the flocculation ability, sludge particle size distribution (PSD), FTIR analysis, excitation-emission matrix (EEM) fluorescence spectroscopy, soluble microbial product (SMP), extracellular polymeric substance (EPS), microscopic observations, microbial activities, microorganism population, and filamentous bacteria are considered to determine sludge characteristics. This study was done in five sections: in the... 

    Kinetics Investigation of the Degradation of Environmental Pollutants by Fenton and Electro-Fenton Processes using Nanomagnetite and Nano Magnetite Supported by Activated Carbon

    , M.Sc. Thesis Sharif University of Technology Askari, Neda (Author) ; Rahmansetayesh, Shahrbano (Supervisor)
    The progress and the development of various industries, pollutants derived from the agricultural and industrial processes contaminate the environment. The degradation of these pollutants have an important effect on the environment.Magnetite (Fe3O4) nanoparticles and magnetite supported on functionalized activated carbon were synthesized and characterized by different techniques such as SEM, FT-IR, XRD, BET and VSM. The catalyst activity of these nanocatalysts was evaluated by the degradation of reactive red ME4BL (RRME4BL) textile dye in heterogeneous Fenton and electro-Fenton processes as a model pollutant. The effect of several parameters such as H2O2, RRME4BL concentration, the amount of...