Abstract
In this work, desorption of Congo red (CR) from dye-loaded phoenix dactylifera date stones (DS-CR) and Zizyphus lotus jujube shells (JS-CR) was investigated. The effects of operating parameters such as different eluents, volume and concentration of eluent, contact time and temperature on desorption of CR from the DS-CR and JS-CR were studied. Experimental results showed that NaOH eluent had better desorption than HCl, HNO3, H2SO4, H3PO4, KOH, NaHCO3, Na2CO3, H2O, CH3OH, C2H5OH and C3H6O. The desorption efficiency increased with increase in volume and concentration of eluent, contact time and temperature. The maximum desorption efficiency of CR from the DS-CR and JS-CR was 92.89% and 86.27%, respectively. The biosorbents can be easily regenerated using NaOH eluent and reused for the dye sorption for four the consecutive biosorption/desorption cycles with high removal of CR, suggesting their applicability toward the textile industry and water purification purpose.
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