9758

9002

كارشناسي ارشد

اكتشاف

اصفهان: دانشگاه صنعتي اصفهان، دانشكده معدن

1393

[سيزده]، 78ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

مرتضي طبايي، علي احمدي

اسماعيل دره ذرشكي

94/1/24

مهدي نصيري، حميد زيلويي

1396/09/25

كتابنامه

معدن

مهندسي معدن

ID9002

AbstractIn recent decades numerous methods were used to remove heavy metals from industrialmine wastewaters Nano sized metal oxides due to their exclusive properties such as verysmall particles low surface to volume ratio surface balance high magnetic properties andcompatibility with environment have a high potential for decreasing the metallic pollutantsfrom water solutions In this research activated carbon treated by nanoparticles of lepidocrocite were used to determine the effect of pH temperature initialconcentration of cations and dosage of adsorbent Experiments were carried out in anincubator shaker at the rotating speed of 150 rpm for 4 hours Results of the experimentaldata were analyzed by analysis of variance ANOVA and the most appropriate model witha confidence level of 95 was used The selected model for responses of copper and nickelremoval efficiencies were linear and quadratic models respectively Results showed thatthe parameters of pH and initial concentration of solution had the most effect on in bothcopper and nickel removal efficiencies Result also showed that by increasing pH theefficiency of heavy metal removal increased while by increasing the initial concentrationof the solutes the removal efficiency of both copper and nickel were decreased The bestconditions of heavy metal removal occurred in a binary system in the pH of 7 and theconcentration of 25 ppm for each of copper and nickel metals which the highest removalefficiency for copper and nickel were at the pH of 6 for copper and 8 for nickel In thisconditions removal efficiency was 100 for copper and 90 62 for nickel Results ofkinetics and isotherm investigations showed that copper and nickel in the individual statefollowed Langmuir and Frundlich model respectively While in the binary system copperfollowed Langmuir model Maximum adsorption capacity for copper was 90 9 and31 85 mmol g in single and binary systems respectively Frundich constant for nickelwas found to be 0 938 mmol g Results of kinetics study showed that adsorption kineticfor copper and nickel followed from pseudo second order In addition to find the efficiencyof removal Supplementary tests were done in optimized conditions and in three primarycycles The removal efficiency of copper and nickel was 95 and 80 respectively Key words Heavy metals Treated activated carbon Maghemite nanoparticles Isotherm Kinetics Removal efficiency

مرتضي طبايي، علي احمدي

اسماعيل دره ذرشكي

مهدي نصيري، حميد زيلويي