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Similarly the different pseudo second order kinetics parameters were determined from the linear plot of t/qt vs t. The correlation coefficients (R2) were computed and all the values are shown in Table 2. The qe values were found to increase with the increase in the initial As(V) concentrations. The curve for pseudo second order kinetics exhibited higher correlation co-efficient compared to pseudo first order model.

Table 2

Values of different second order kinetic parameters at different initial As(V) concentrations

CMT
SPC
C0 (mg/L)aMass (g)bqe (mg/g)K (g/mg min)h (mg/g min)R2qe (mg/g)K (g/mg min)H (mg/g min)R2
0.1 0.196 0.633 0.025 0.995 0.174 6.221 0.189 0.999 
0.2 0.354 0.568 0.071 0.998 0.362 0.271 0.035 0.990 
0.3 0.597 0.154 0.055 0.992 0.538 0.148 0.043 0.988 
0.4 0.767 0.112 0.066 0.988 0.707 0.094 0.047 0.980 
0.5 0.868 0.148 0.112 0.995 0.809 0.085 0.056 0.971 
0.6 0.962 0.197 0.182 0.997 0.889 0.076 0.059 0.968 
0.7 1.010 0.297 0.304 0.998 1.091 0.052 0.062 0.945 
CMT
SPC
C0 (mg/L)aMass (g)bqe (mg/g)K (g/mg min)h (mg/g min)R2qe (mg/g)K (g/mg min)H (mg/g min)R2
0.1 0.196 0.633 0.025 0.995 0.174 6.221 0.189 0.999 
0.2 0.354 0.568 0.071 0.998 0.362 0.271 0.035 0.990 
0.3 0.597 0.154 0.055 0.992 0.538 0.148 0.043 0.988 
0.4 0.767 0.112 0.066 0.988 0.707 0.094 0.047 0.980 
0.5 0.868 0.148 0.112 0.995 0.809 0.085 0.056 0.971 
0.6 0.962 0.197 0.182 0.997 0.889 0.076 0.059 0.968 
0.7 1.010 0.297 0.304 0.998 1.091 0.052 0.062 0.945 

aCo: Initial concentration of As(V) solution.

bMass of CMT and SPC (adsorbent).

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