Adsorption Equilibrium and Kinetics of Fe3+ by Sugar Beet Pulp
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Abstract:
Sugar beet pulp (SBP) is rich in dietary fiber and is the major by-product in sugar industry, which is often used to treat the pollution of heavy metals and pigments in wastewater because of its strong combining capacity of cations. The effects of sorbent dosage, sorbent particle size, contact time, and initial concentration of Fe3+ on adsorption of the necessary macro element Fe in body by SBPwere studied andthe adsorption equilibrium and kinetics models were also conducted. Results showed that the uptake of Fe3+ increased with decreasing particle size and increasing initial concentration of Fe3+; the sorption process reached equilibrium after 80~100 min of contact; 65% of Fe3+ was removed by using 5g/L of SBP (particle size 75 μm~150 μm) with 93% water and 0.001 mol/L Fe3+ at 25 ℃ for contacting 100 min; the pseudo second-order kinetic model could be described by the adsorption process(R2≥0.99); and the adsorption equilibrium data fitted well with the Freundlich adsorption isotherm equation, showing the adsorption of Fe3+ by SBP was not in monomolecular layer type. SBP, which is cheap and highly selective, seems to be a promising substrate to develop organic iron agent with high bioactivity.
