Fixed-bed column dynamics of xanthate-modified apple pomace for removal of Pb(II)
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A continuous fixed-bed column study has been investigated to evaluate Pb(II) adsorption from an aqueous solution onto xanthate-modified apple pomace (XMAP). The experimentally observed breakthrough curve was used to estimate the performance of XMAP for different parameters. It was observed that adsorption capacities of the XMAP bed increased from 188 to 192 mg/g by increasing the flow rate from 20 to 60 mL/min. The maximum capacities (Qmax) were found to be 160,165 and 177 mg/L at concentrations of 30, 40–50 mg/L, respectively. It was also observed that the breakthrough time increased from 105 to 255 min when the bed depth was increased from 5 to 15 cm. Overall in the column study, Thomas model predicted the breakthrough curve with a correlation coefficient ranging from 0.93 to 0.98. The adsorption capacities estimated for various flow rate, concentration of Pb(II) and bed height using Thomas model were in well agreement with the experiment. The regeneration study indicated that XMAP could be utilized up to five cycles with consistent adsorption efficiency of 183 mg/g. Thus, with its higher capacity, easy recovery and eco-friendly induce XMAP could be a potential adsorbent for Pb(II) removal.
KeywordsFixed-bed column Adsorption Metal Apple pomace Thomas model Waste
The authors are thankful to the Director CSIR-NEERI, Nagpur for providing research facilities. We also greatly appreciate financial support from Department of Science, New Delhi for this work.
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Conflict of interest
All the authors declare that they have no conflict of interest.
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