| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 226796 | Journal of Industrial and Engineering Chemistry | 2015 | 9 Pages |
•The acid treatment results in re-organization of the nano-pores by leaching Mg.•The uptake of oil contaminants on treated clays is affected by treatment condition.•The acid type and concentration are important factors that influence the oil recovery.•The activation of clay by sulfuric acid yields an efficient adsorbent material.•The interlayer spacing should be considered in evaluation of activated bentonite.
The nano-porous adsorbents were initially produced by acid treatment of natural clay. The effects of some important factors such as acid type, concentration and residence time were evaluated on porous structure of adsorbent. A reduction about 2.7 Å was observed in the distance of montmorillonite layers due to replacement of hydrogen ions in the presence of sulfuric acid. The number of nano-pores, 12 nm, was preferable for removal of contaminations from spent engine oil, depending on the activation agent type in the treatment process. The results are very promising for reduction of adsorbent content in the regeneration of waste lubricant oil.
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