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Beni-Suef University Journal of Basic and Applied Sciences

Table 3 Kinetic parameter for hexavalent chromium bioreduction by Tamarindus indica methanol leaves extract at pH 9

From: Kinetics and thermodynamics of Cr (VI) reduction by Tamarindus indica methanol leaves extract under optimized reaction conditions

Kinetic model

Correlation (R2)

T1/2 (min)

K

qe (mg/L)

First order

0.572

27.61

2.5 × 10−2

1.506

Pseudo-first order

0.758

3.300

2.1 × 10−1

2,179,716.4

Second order

0.426

184.3

3.76 × 10−3

8.937

Pseudo-second order

0.167

152.3

4.55 × 10−3

3.680

  1. The correlation coefficient value in bold indicated the highest correlation value and the most predominant order of the reaction
  2. R2 = Correlation coefficient, T1/2 = reaction half-life, K = rate constant in different units (first and pseudo-first order in min−1 and second and pseudo-second order in mg/L−1 min−1), qe = equilibrium concentration
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