Soluble hydrocarbons uptake by porous carbonaceous adsorbents at different water ionic strength and temperature: something to consider in oil spills
| Autor: | Luis Felipe Chazaro Ruiz, Jose Rene Rangel-Mendez, Carlos E. Flores-Chaparro, Ma. Catalina Alfaro-De la Torre |
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| Rok vydání: | 2015 |
| Předmět: |
Health
Toxicology and Mutagenesis Portable water purification 02 engineering and technology 010501 environmental sciences Naphthalenes 01 natural sciences Hydrocarbons Aromatic Water Purification chemistry.chemical_compound Adsorption Desorption medicine Environmental Chemistry Organic chemistry Petroleum Pollution Benzene 0105 earth and related environmental sciences Naphthalene Osmolar Concentration Temperature General Medicine 021001 nanoscience & nanotechnology Pollution Toluene Carbon Hydrocarbons chemistry Ionic strength Environmental chemistry Charcoal 0210 nano-technology Porosity Water Pollutants Chemical Activated carbon medicine.drug |
| Zdroj: | Environmental science and pollution research international. 23(11) |
| ISSN: | 1614-7499 |
| Popis: | Nowadays, petrochemical operations involve risks to the environment and one of the biggest is oil spills. Low molecular aromatics like benzene, toluene, and naphthalene dissolve in water, and because of their toxicological characteristics, these produce severe consequences to the environment. The oil spill cleanup strategies are mainly designed to deal with the heavy fractions accumulated on the water surface. Unfortunately, very limited information is available regarding the treatment of dissolved fractions.A commercial (Filtrasorb 400) and modified activated carbons were evaluated to remove benzene, toluene, and naphthalene from water, which are the most soluble aromatic hydrocarbons, at different ionic strengths (I) and temperatures (0-0.76 M and 4-25 °C, respectively). This allowed simulating the conditions of fresh and saline waters when assessing the performance of these adsorbents. It was found that the hydrocarbons adsorption affinity increased 12 % at a I of 0.5 M, due to the less negative charge of the adsorbent, while at a high I (≃0.76 M) in a synthetic seawater, the adsorption capacity decreased 21 % that was attributed to the adsorbent's pores occlusion by water clusters. Approximately, 40 h were needed to reach equilibrium; however, the maximum adsorption rate occurred within the first hour in all the cases. Moreover, the hydrocarbons adsorption and desorption capacities increased when the temperature augmented from 4 to 25 °C. On the other hand, thermally and chemically modified materials showed that the interactions between adsorbent-contaminant increased with the basification degree of the adsorbent surface. |
| Databáze: | OpenAIRE |
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