Search for: activated-carbon
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    Optimization of a new activated carbon based sorbent for on-line preconcentration and trace determination of nickel in aquatic samples using mixed-level orthogonal array design

    , Article Analyst ; Volume 125, Issue 9 , 2000 , Pages 1649-1654 ; 00032654 (ISSN) Bagheri, H ; Saraji, M ; Naderi, M ; Sharif University of Technology
    Royal Society of Chemistry  2000
    A mini-column was made by packing α-diphenylglyoxime (DPG), a known ligand for complexation with nickel ions, loaded on activated charcoal (AC). Water samples were buffered at the pH range 8-9 and then passed through the column. After the preconcentration step, the column was eluted with 0.2 M nitric acid into the atomic absorption spectrometer (AAS). Mixed-level orthogonal array design (OAD) was used as a chemometric approach to study the effect of various factors on recovery of extraction. Factors such as pH, amount of sorbent, flow rate of sample, concentration and volume of the sample were investigated. Effects of interference ions, i.e., Co, Cu, Bi, Fe(I1), Pt and Pd was also studied.... 

    Studies on treatment of carbonaceous wastewater by Fixed Film Aeration Tank

    , Article Scientia Iranica ; Volume 9, Issue 1 , 2002 , Pages 47-52 ; 10263098 (ISSN) Yaghmaei, S ; Sharif University of Technology
    Sharif University of Technology  2002
    In this paper, a modified activated sludge process using a Fixed Film Aeration Tank (FFAT) was investigated as an improvement for the usual activated sludge or trickling filtration processes. The aeration tank of the system was arranged with fixed parallel saran nets, which were set vertically as supporting media for microbial growth. A carbonaceous solution was brought into contact with microorganisms in the media and was oxidized aerobically. Filamentous microorganisms predominantly grew on the films and the COD removal increased with the increase in accumulated biomass in the system. Simulation of treatment performance in the system was carried out using mathematical models. The... 

    Experimental and theoretical study on BTEX removal from aqueous solution of diethanolamine using activated carbon adsorption

    , Article Journal of Natural Gas Science and Engineering ; Volume 22 , 2015 , Pages 618-624 ; 18755100 (ISSN) Aleghafouri, A ; Hasanzadeh, N ; Mahdyarfar, M ; SeifKordi, A ; Mahdavi, S. M ; Zoghi, A. T ; Sharif University of Technology
    Elsevier  2015
    Activated carbon beds are extensively used in sweetening units of natural gas refineries for the purification of contaminated amine solutions. Correlation of experimental adsorption data using an analytical isotherm equation is need to design an accurate activated carbon bed. In the present study, the adsorption of BTEX from Diethanolamine (DEA) solution by commercial and granular activated carbon (AC) were performed. The Langmuir, Freundlich and Sips isotherm models were used to describe the equilibrium data. The accuracy of the results obtained from the adsorption isotherm models was compared and the values for the regressed parameters were reported. The results show that the Freundlich... 

    Comparison of adsorption process by GAC with novel formulation of coagulation - Flocculation for color removal of textile wastewater

    , Article International Journal of Environmental Research ; Volume 2, Issue 3 , 2008 , Pages 239-248 ; 17356865 (ISSN) Hassani, A. H ; Seif, S ; Javid, A. H ; Borghei, M ; Sharif University of Technology
    This study evaluates the effectiveness of adsorption process by Granular Activated Carbon (GAC) compared with a novel formulation of coagulation - flocculation process for dye removal from textile wastewater. In this regard, acidic, reactive, disperse and direct red dye are used to prepare the synthetic dye. Dominant wave length for each dye is determined by spectrophotometeric method. Using GAC as adsorbent, equilibrium time and adsorption isotherm of each dye are determined with aid of spectrophotometric method. The results show that GAC can not remove dispersed red dye. Acidic red, direct red and reactive red of 5 mg/L concentration are removed by GAC up to %90, %88 and %43 in 30, 60 and... 

    Column and batch study of haloacetic acids adsorption onto granular activated carbon

    , Article Research Journal of Chemistry and Environment ; Volume 15, Issue 2 , Jun , 2011 , Pages 866-872 ; 09720626 (ISSN) Tabatabaee, G. S. M ; Mousavi, S. M ; Soltanieh, M ; Seif, K. A. K ; Sharif University of Technology
    The granular activated carbon (GAC) was used as an adsorbent for its ability to remove haloacetic acids (HAAs) from drinking water by batch and column experiments. Various thermodynamic parameters, such as ΔG°, ΔH° and ΔS° have been calculated. The thermodynamics of HAAs onto GAC system indicates spontaneous and exothermic nature of the process. The ability of GAC to adsorb HAAs in a fixed bed column was investigated as well. The effect of operating parameters such as flow rate and inlet HAAs concentration on the sorption characteristics of GAC was investigated. The total adsorbed quantities, equilibrium uptakes and total removal percents of HAAs related to the effluent volumes were... 

    Theoretical and Experimental Study on the Adsorption and Desorption of Methane by Granular Activated Carbon at 25°C

    , Article Journal of Natural Gas Chemistry ; Volume 16, Issue 4 , December , 2007 , Pages 415-422 ; 10039953 (ISSN) Salehi, E ; Taghikhani, V ; Ghotbi, C ; Nemati Lay, E ; Shojaei, A ; Sharif University of Technology
    A theoretical and experimental study was conducted to accurately determine the amount of adsorption and desorption of methane by various Granular Activated Carbon (GAC) under different physical conditions. To carry out the experiments, the volumetric method was used up to 500 psia at constant temperature of 25 °C. In these experiments, adsorption as well as desorption capacities of four different GAC in the adsorption of methane, the major constituent of natural gas, at various equilibrium pressures and a constant temperature were studied. Also, various adsorption isotherm models were used to model the experimental data collected from the experiments. The accuracy of the results obtained... 

    Performance enhancement of dissolved air flotation column in removing low concentrations of heavy fuel oil by adding powdered activated carbon

    , Article Desalination and Water Treatment ; Volume 51, Issue 16-18 , 2013 , Pages 3353-3360 ; 19443994 (ISSN) Hosseinzadeh, H ; Shayegan, J ; Jalali, M ; Sharif University of Technology
    Taylor and Francis Inc  2013
    In this study, the effect of adding walnut shell-based powdered activated carbon (WS) to a bench-scale dissolved air flotation (DAF) column on oil removal was investigated. All experiments were conducted using synthetically prepared wastewater containing low but stable concentrations of heavy fuel oil. After comparing the effect of different WS doses from 0 (blank) to 40 mg/L at the saturator pressure of 5 bar and 10 min flotation time, 20 mg/L WS was chosen as the optimal concentration. In order to find the best flotation time for efficient use of WS capacity, experiments were repeated with and without 20 mg/L WS at longer flotation times. According to the obtained results, by adding WS,... 

    Mercury ion adsorption on AC@Fe3O4-NH2-COOH from saline solutions: Experimental studies and artificial neural network modeling

    , Article Korean Journal of Chemical Engineering ; Volume 35, Issue 3 , 2018 , Pages 671-683 ; 02561115 (ISSN) Pazouki, M ; Zabihi, M ; Shayegan, J ; Fatehi, M. H ; Sharif University of Technology
    Springer New York LLC  2018
    An efficient, novel functionalized supported magnetic nanoparticle (AC@Fe3O4-NH2-COOH) has been synthesized by co-precipitation method for removal of mercury ions from saline solutions. High dispersed supported magnetic nanoparticles with particle sizes less than 30 nm were formed over activated carbon derived from local walnut shell. Surface characterizations of supported magnetic nanoparticles were evaluated by Boehm test, Brunauer- Emmett-Teller (BET) surface area, X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and X-ray fluorescence (XRF). A three-layer artificial neural network (ANN) code... 

    Biocompatible magnetic N-rich activated carbon from egg white biomass and sucrose: Preparation, characterization and investigation of dye adsorption capacity from aqueous solution

    , Article Surfaces and Interfaces ; Volume 15 , 2019 , Pages 157-165 ; 24680230 (ISSN) Vahdati Khajeh, S ; Zirak, M ; Zooghi Tejrag, R ; Fathi, A ; Lamei, K ; Eftekhari Sis, B ; Sharif University of Technology
    Elsevier B.V  2019
    In the present work, N-rich activated carbon was synthesized using hydrothermal carbonization of egg white biomass in the presence of sucrose, followed by chemical activation and magnetization of hydrochar in the presence of iron (II) and (III) at NaOH solution. The results showed that the sucrose has a critical role in hydrochar yield by increasing of sucrose content. This claim also proved by SEM analysis, which hydrochar morphology was changed from the layered to fused carbon spheres morphology that confirmed the increasing of nucleation site. The materials were characterized with VSM, SEM, CHN, FTIR, Raman spectroscopy and XRD techniques. Capacity of prepared magnetic activated carbon... 

    Catalytic wet peroxide oxidation of phenol : H2O2 gradual addition study

    , Article 2008 AIChE Annual Meeting, AIChE 100, Philadelphia, PA, 16 November 2008 through 21 November 2008 ; November , 2008 ; 9780816910502 (ISBN) Molaei Dehkordi, A ; Ebrahimi, A. A ; Shahalami, S ; Sharif University of Technology

    Oil Separation from Contaminated Condensates WithFuel in Power Plant by Flotation &Solvent Sublation

    , M.Sc. Thesis Sharif University of Technology Hosseinzadeh, Hossein (Author) ; shaygan, Jalaloddin (Supervisor) ; Jalali, Morteza (Supervisor)
    Some of the thermal power plants use heavy fuel oil as an auxiliary fuel instead of the fuel gas, especially in the cold seasons. In these plants, in order to reduce fuel viscosity, heavy fuel oil is heated in several stages including fuel storage tank, connection lines and oil supply to burner by heat exchange with returned steam from the turbine, which can lead to fuel leakage into the condensates. This contamination is in addition to the contamination that has resulted from leaking seals on steam driven equipments, such as pumps and turbines. Reusing these contaminated condensates as boiler feed water can lead to coking of hydrocarbons and deposition of a hard scale on boiler tube walls.... 

    Biological Regeneration of Used Activated Carbon

    , M.Sc. Thesis Sharif University of Technology Noori Ghezeldareh, Maral (Author) ; Borghei, Mehdi (Supervisor)
    Tehran Refinery, as an industrial center that has significant water consumption in Tehran, intends to use the flow of water from the treatment plant south of Tehran after final preparation, with the aim of managing water resources and meeting its needs. And it uses a biological activated carbon (BACF) filter to reduce the DOC concentration. In these filters, the removal of organic matter is performed by the adsorption process as well as the biodegradation process by microorganisms grown on activated carbon. The presence of biofilm leads to continuous bio-regeneration of activated carbon during the water treatment process. Therefore, in this study, by examining the performance of these... 

    ANFIS modeling of rhamnolipid breakthrough curves on activated carbon

    , Article Chemical Engineering Research and Design ; Volume 126 , 2017 , Pages 67-75 ; 02638762 (ISSN) Baghban, A ; Sasanipour, J ; Haratipour, P ; Alizad, M ; Vafaee Ayouri, M ; Sharif University of Technology
    Institution of Chemical Engineers  2017
    Owning to interesting properties of biosurfactants such as biodegradability and lower toxicity, they have broad application in the food industry, healthy products, and bioremediation as well as for oil recovery. The present study was aimed to develop a GA-ANFIS model for predicting the breakthrough curves for rhamnolipid adsorption over activated carbon. To that end, a set of 296 adsorption data points were utilized to train the proposed FIS structure. Different graphical and statistical methods were also used to evaluate the model's accuracy and reliability. Results were then compared to those of the previously reported Artificial Neural Network (ANN) and Group Method Data Handling (GMDH)... 

    Bioregeneration of Granular activated carbon (GAC) contaminated with phenolic compounds

    , M.Sc. Thesis Sharif University of Technology Ahangar, Ata Ollah (Author) ; Vossoughi, Manouchehr (Supervisor) ; Borghei, Mehdi (Supervisor)
    This project surveys bioregeneration of granular activated carbons contaminated with phenolic compounds. To carry out this survey, the procedure of phenol absorption on the surface of activated carbon was studied and their adsorption isotherms were calculated. In the first step, newly activated carbon was contaminated with phenol solution and optimum amount of carbon in phenol elimination was 0.5g. Then, the effect of time contact on phenol elimination was studied and eventually 1 hour of time contact was determined as the equilibrium time of phenol adsorption. In the second step, kinetics of adsorption of phenol and different stages of adsorption were studied. The results of this study... 

    Comparison of Activated Carbon from Cellulose Resources in Separating Oil Pollutants from Contaminated Water (Case Study: Benzene)

    , M.Sc. Thesis Sharif University of Technology Soltani, Samira (Author) ; Borgheie, Mehdi (Supervisor)
    Activated carbon, as an adsorbent with a high adsorption capacity and low cost, has many applications in liquid and gas adsorption processes. Among the adsorption of liquid phase, there are examples of drinking water purification, wastewater treatment, food industry, brewery, chemical separation (acids, amines, glycerin and glycols), enzymes ... and in adsorption from the gas phase there are examples of removing toxic compounds Containing sulfur and recycling sulfur, purifying biogas, use in gas masks, etc. Various materials can be used as raw material to make activated carbon. Materials such as walnut, almonds, coconut, pine, corn, etc. In this thesis, a feasibility study on the production... 

    BTEX Removal from Aqueous Alkanolamines by Adsorption Method with Active Carbon

    , M.Sc. Thesis Sharif University of Technology Hassanzadeh, Nadia (Author) ; Safe Kordi, Ali Akbar (Supervisor) ; Taghi Zoghi, Ali (Supervisor)
    Natural gas contains small amount of benzene, toluene, ethyl benzene and meta-xylene (BTEX). These compounds are soluble in amine solutions and accumulate in aqueous amine solution during sour gas removal process. They produce problems such as foaming in amine adsorption columns. The aim of this work is to study BTEX removal from aqueous amine solution by means of activated carbon. Three different commercially available granular activated carbons were used in experiments. Experiments were divided in static and dynamic adsorption categories. In the static tests, equilibrium adsorption of all three activated carbons were performed and the most effective activated carbon sample determined by... 

    Investigation of Adsorption on Mixed Adsorbents

    , M.Sc. Thesis Sharif University of Technology Firouzbakht, Behnaz (Author) ; Safe Kordi, Ali Akbar (Supervisor)
    Adsorption of acetone vapors on mixture of silica gel and activated carbon was studied. Adsorption is defined as the attraction adsorbate (liquid or gas) particles onto the surface of a solid (porous solid). Most of the experimental works are adsorption of a one or more component on an adsorbent. Presence of two or more adsorbents together may effect on adsorption rate, uptake and thermodynamic conditions. When we have limitation in using a kind of adsorbent, these results can be helpful. There are several motivating reasons for the study of adsorption on adsorbent mixtures. During the adsorbent manufacturing process, multiple batches may differ slightly from each other(and from the customer... 

    Experimental and Theoretical Study of the Effect of Moisture on Methane Adsorption and Desorption by Activated Carbon at 273.5 K

    , Article Journal of Natural Gas Chemistry ; Volume 16, Issue 1 , 2007 , Pages 22-30 ; 10039953 (ISSN) Farzad, S ; Taghikhani, V ; Ghotbi, C ; Aminshahidi, B ; Lay, E. N ; Sharif University of Technology
    Adsorption and desorption of methane by activated carbon (AC) at constant temperature and at various pressures were investigated. The effect of moisture was also studied. A volumetric method was used, up to 40 bar, at a temperature of 273.5 K. Results of a dry AC sample were compared with those obtained from a moist sample and two different ACs with different physical and surface properties were used. As expected, the results showed that the existence of moisture, trapped in the AC pores, could lead to a decrease in the amount of methane adsorbed and a decrease in the amount of methane delivered during desorption. To model the experimental results, a large variety of adsorption isotherms... 

    Synthesis, characterization, and cesium sorption performance of potassium nickel hexacyanoferrate-loaded granular activated carbon

    , Article Particulate Science and Technology ; Vol. 32, issue. 4 , 2014 , pp. 348-354 ; ISSN: 02726351 Dashtinejad, M ; Samadfam, M ; Fasihi, J ; Grayeli Fumeshkenar, F ; Sepehrian, H ; Sharif University of Technology
    GAC has been modified by loading of potassium nickel hexacyanoferrate (KNiCF) as a new adsorbent for cesium adsorption. The potassium nickel hexacyanoferrate-loaded granular activated carbon (KNiCF-GAC) was characterized using powder x-ray diffraction (XRD) and nitrogen adsorption-desorption isotherm data, infrared spectroscopy, and its cesium adsorption performance in aqueous solution was investigated. The effect of the various parameters such as initial pH value of the solution, contact time, temperature, and initial concentration of the cesium ion on the adsorption efficiencies of KNiCF-GAC have been studied systematically by batch experiments. The adsorption isotherm of KNiCF-GAC was... 

    Modeling and preparation of activated carbon for methane storage II. neural network modeling and experimental studies of the activated carbon preparation

    , Article Energy Conversion and Management ; Volume 49, Issue 9 , September , 2008 , Pages 2478-2482 ; 01968904 (ISSN) Namvar Asl, M ; Soltanieh, M ; Rashidi, A ; Sharif University of Technology
    This study describes the activated carbon (AC) preparation for methane storage. Due to the need for the introduction of a model, correlating the effective preparation parameters with the characteristic parameters of the activated carbon, a model was developed by neural networks. In a previous study [Namvar-Asl M, Soltanieh M, Rashidi A, Irandoukht A. Modeling and preparation of activated carbon for methane storage: (I) modeling of activated carbon characteristics with neural networks and response surface method. Proceedings of CESEP07, Krakow, Poland; 2007.], the model was designed with the MATLAB toolboxes providing the best response for the correlation of the characteristics parameters and...