مطالعات دسته ای و ستونی برای جذب کروم (VI) با هزینه کم

عنوان انگليسی

Batch and column studies for the adsorption of chromium(VI) on low-cost Hibiscus Cannabinus kenaf, a green adsorbent

خلاصه انگلیسی

Adsorption is one of the excellent ways for heavy metal removal from aqueous solution because of advan- tages like the low cost, availability, profitability, ease of operation and efficiency. In this study, adsorption potential of a low cost adsorbent Hibiscus Cannabinus kenaf was investigated for Cr(VI) removal from water using batch and continuous mode experiments. Optimum removal of Cr(VI) ions was occurred at pH 7. The kinetic results showed that the Cr(VI) removal followed intraparticle diffusion kinetics with a correlation coefficient greater than 0.94. The adsorption isotherms of Cr(VI) could be described very well by both the Langmuir and Freundlich equations ( R 2 = 0.997). The maximum Cr(VI) uptake was found to be 582 μg/g in Langmuir model. Column studies have been carried out to compare these with batch capac- ities. The Yoon–Nelson and Thomas models were found appropriate for description of the breakthrough curve, whereas the Bohart–Adams model was not match very well. The recovery of Cr(VI) and chemical regeneration of the spent kenaf have also been studied. The high Cr(VI) adsorption capacity and regener- ation efficiency of kenaf suggests it as a promising alternative for heavy metal removal specially at near circumneutral pH.

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