recycling of residual oil fly ash: synthesis and characterization of activated carbon by physical activation methods for heavy metals adsorption

نویسندگان

s. salehin

a. s. aburizaiza

m. a. barakat

چکیده

in this study, the recycling possibility of residual oil fly ash (rofa) towards preparing activated carbon and its application in environmental remediation through adsorbing cu (ii) and pb (ii) ions from aqueous solutions were investigated. activated carbons were prepared using two different physical activation methods such as under steam flow at 950 0c, and combined steam and co2 flow at 850 0c for 2 hours. characterization of activated carbons was done by bet surface area method, scanning electron microscopy (sem), fourier transform infra-red spectroscopy (ftir), and x-ray diffraction technique (xrd). combined gasification increased the surface area of rofa particles quite higher (110.89 to 423.09 m2/g) than only steam activation (275.07 m2/g). development of microporosity was also achieved during the treatments and it increased from 0.043 cc/g (raw ash) to 0.325 in steam activated samples, and 0.078 in combined gas activated samples. ftir analysis showed the presence of aromatic, ester, and hydroxyl functional groups on the rofa surface after the treatment while xrd examination confirmed its carbonaceous and amorphous nature. ph 5 was found optimum for the adsorption studies at which the removal efficiencies were >71% for cu (ii) and >80% for pb (ii). the langmuir isotherm model was found statistically significant for both cu (ii) (r2 > 0.95) and pb (ii) (r2 > 0.99). rofa has been successfully recycled in this work and the activated carbons might be considered for industrial applications.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

synthesis and characterization of some macrocyclic schiff bases

ماکروسیکلهای شیف باز از اهمیت زیادی در شیمی آلی و دارویی برخوردار می باشند. این ماکروسیکلها با دارابودن گروه های مناسب در مکانهای مناسب می توانند فلزاتی مثل مس، نیکل و ... را در حفره های خود به دام انداخته، کمپلکسهای پایدار تولید نمایند. در این پایان نامه ابتدا یک دی آلدئید آروماتیک از گلیسیرین تهیه می شود و در مرحله بعدی واکنش با دی آمینهای آروماتیک و یا آلیفاتیک در رقتهای بسیار زیاد منجر به ت...

15 صفحه اول

Adsorption of heavy metals by EPS of activated sludge.

Extracellular polymeric substances (EPSs) were extracted by high-speed centrifugation at 20,000 G for 30 min from an activated sludge treating municipal wastewater. Each gram of sludge, as measured in volatile suspended solids (VSS), contained 7.3 mg of EPS, including 6.5 mg of protein (EPSp) and 0.8 mg of carbohydrate (EPSc). The EPSp had a mean MW of 2.0 x 105; about 18% of EPSp had MW over 5...

متن کامل

Physical and biological studies of coal and oil fly ash.

Studies were performed to compare the physical and chemical characteristics and the in vitro macrophage cytotoxicity of oil and coal fly ash. Sampling methodology was developed to collect size-fractionated particulate matter from the smokestack of either a coal-fired or an oil-fired power plant. Morphological studies demonstrated particle heterogeneity, although most coal fly ash particles appe...

متن کامل

Efficiency of Activated Carbon Produced by Physical Activation Using Nitrogen Gas for Maximum Dye Adsorption from Polluted Effluents: Genetic Programming and Neural Network

Background and purpose: This study was conducted for the first time to produce activated carbon (AC) from Milkvetch wood by physical activation in order to achieve the maximum adsorbent capacity in adsorption of dye. The aim of this study was to remove acid orange 7 (AO7) dye using AC produced by physical activation with nitrogen gas. Materials and methods: AC activation was performed by physi...

متن کامل

Experimental Study and Adsorption Modeling of COD Reduction by Activated Carbon for Wastewater Treatment of Oil Refinery

Application of Granular Activated Carbon (GAC) in adsorption process has been studied for the advanced treatment of municipal and industrial wastewater. Because of entering poisonous compounds such as furfural, phenol and sulfides into the oily wastewater of Tehran refinery, biological aeration basins of wastewater treatment unit may not have the desired performance of COD reductio...

متن کامل

Naphthalene and o-Xylene Adsorption onto High Carbon Fly Ash

Adsorption is an effective remediation technique for petroleum hydrocarbons because of its ease of use and high efficiency. The utilization of high-carbon content industrial by-products in such applications can present significant economic and environmental advantages. In this study, batch adsorption tests and petrographic analyses were used to investigate the adsorption of two nonpolar petrole...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
international journal of environmental research

ناشر: university of tehran

ISSN 1735-6865

دوره 9

شماره 4 2015

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023