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Adsorption of petroleum monoaromatics from aqueous solutions using granulated surface modified natural nanozeolites: Systematic study of equilibrium isotherms

Seifi, L ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s11270-010-0614-7
  3. Abstract:
  4. Petroleum monoaromatics including benzene, toluene, ethylbenzene, and xylenes (BTEX) are among the notorious volatile organic compounds that contaminate water and soil. In this study, a surfactant- modified natural zeolite and its relevant granulated nanozeolites were evaluated as potential adsorbents for removal of petroleum monoaromatics from aqueous solutions. All experiments performed in batch mode at constant temperature of 20°C and pH of 6.8 for 48 h. The results revealed that the amount of BTEX uptake on granulated zeolites nanoparticles were remarkably higher than the parent micron size natural zeolite (in the order of four times). The isotherms data were analyzed using five models namely, Langmuir, Fruendlich, Elovich, Temkin, and Dubinin-Radushkevich models. It was concluded that the Langmuir model fits the experimental data. The measured adsorption capacities were 3.89 and 4.08 mg of monoaromatics per gram of hexadecyltrimethylammonium-chloride and n-cetylpyridinium bromide (CPB)-modified granulated nanozeolite, respectively. Considering the type of surfactant, adsorbents modified with CPB showed greater tendency for the adsorption of the adsorbates
  5. Keywords:
  6. Adsorption isotherm ; Granulated adsorbent ; Natural nanozeolite ; Petroleum monoaromatics ; Nanozeolites ; Thermodynamic study ; Adsorbents ; Adsorption isotherms ; Aromatic hydrocarbons ; Bromine compounds ; Chlorine compounds ; Silicate minerals ; Solutions ; Surface active agents ; Thermodynamic properties ; Volatile organic compounds ; Adsorption ; Adsorbent ; Aromatic compound ; Benzene ; Cetrimonium chloride ; Cetylpyridium bromide ; Ethylbenzene ; Nanozeolite ; Petroleum ; Toluene ; Unclassified drug ; Xylene ; Aqueous solution ; Aromatic hydrocarbon ; BTEX ; Soil pollution ; Surfactant ; Thermodynamics ; Volatile organic compound ; Water pollution ; Zeolite ; Chemical modification ; Controlled study ; Dubinin Radushkevich model ; Elovich model ; Equilibrium isotherm ; Fruendlich model ; Isotherm ; Langmuir model ; Mathematical model ; Particle size ; pH ; Temkin model ; Temperature
  7. Source: Water, Air, and Soil Pollution ; Volume 217, Issue 1-4 , 2011 , Pages 611-625 ; 00496979 (ISSN)
  8. URL: http://link.springer.com/article/10.1007%2Fs11270-010-0614-7