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مقالات شیمیایی 2013
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • removal of heavy metal ions from aqueous solutions using low-cost sorbents obtained from ash

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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    • شماره تماس دبیرخانه رویداد: -
     this study’s main objective was the development of effective low-cost sorbents for the removal of heavy metal ions from aqueous solutions. the influence of different factors on the sorption capacity of ash and modified ash as low-cost sorbents obtained by different methods was investigated. the synthesis of new ash-based materials was carried out at ambient temperature (20°c), 70°c, and 90°c, respectively, in an alkaline medium with naoh concentrations of 2 m and 5 m, respectively, corresponding to a mixture with solid/liquid ratios of 1: 3 and 1: 5, respectively. the prepared materials (sorbents) were characterised by scanning electron microscopy (sem), energy dispersive x-ray analysis (edax), x-ray diffraction, and bet surface measurement. adsorption isotherms were determined using the batch equilibrium method. the results showed that these types of new materials displayed a good capacity to remove copper, nickel, and lead ions (29.97 mg of cu2+ per g of sorbent, 303 mg of ni2+ per g of sorbent, and 1111 mg of pb2+ per g of sorbent) from aqueous solutions. the modified materials were prepared using an alkaline attack (a recognised method used in previous studies), but romanian ash from a thermal power plant was studied for the above purpose for the first time. hence, the factors which affect the sorption capacity of the prepared low-cost sorbents were determined and their behaviour was explained, taking into account the composition and structure of the new materials.

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