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Table 4

Values of obtained Qeq and thermodynamic parameters of adsorption of Cd2+, Pb2+ Cr3+ on açaí biosorbent (Euterpe oleracea Mart.)

MetalsTemperature (°C)QeqThermodynamic parameters
R2
ΔGΔHΔS
Cd2+ 15 3.013 −0.003 0.008 0.011 0.996 
25 3.441 −0.003 
35 3.522 −0.004 
45 3.553 −0.004 
55 3.675 −0.004 
Pb2+ 15 2.221 −0.010 0.005 0.034 0.917 
25 2.074 −0.010 
35 2.044 −0.010 
45 2.035 −0.011 
55 2.032 −0.011 
Cr3+ 15 0.519 0.013 −6.679 0.046 0.963 
25 0.552 0.014 
35 0.580 0.014 
45 0.594 0.015 
55 0.597 0.015 
MetalsTemperature (°C)QeqThermodynamic parameters
R2
ΔGΔHΔS
Cd2+ 15 3.013 −0.003 0.008 0.011 0.996 
25 3.441 −0.003 
35 3.522 −0.004 
45 3.553 −0.004 
55 3.675 −0.004 
Pb2+ 15 2.221 −0.010 0.005 0.034 0.917 
25 2.074 −0.010 
35 2.044 −0.010 
45 2.035 −0.011 
55 2.032 −0.011 
Cr3+ 15 0.519 0.013 −6.679 0.046 0.963 
25 0.552 0.014 
35 0.580 0.014 
45 0.594 0.015 
55 0.597 0.015 

Qeq: adsorbed amount of metal ion per unit of adsorbent (mg g−1); ΔG: Gibbs free energy variation (kJ mol−1); ΔH: change in enthalpy (J mol−1); ΔS: change in entropy (J mol−1).

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