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Table 2

Kinetic parameters for NH3-N adsorption

AdsorbentQm(mg/g)Qe(mg/g)k1(min−1)R2
Pseudo-first-order 
Zn(II)-loaded resin 50 mg/L 2.303 1.507 0.0722 0.9254 
Zn(II)-loaded resin 100 mg/L 4.892 3.315 0.0475 0.9649 
Zn(II)-loaded resin 200 mg/L 8.712 6.267 0.0593 0.9449 
AdsorbentQe(mg/g)k2(g/mg min)R2
Pseudo-second-order 
Zn(II)-loaded resin 50 mg/L 1.577 0.0648 0.990  
Zn(II)-loaded resin 100 mg/L 3.486 0.0196 0.991  
Zn(II)-loaded resin 200 mg/L 6.571 0.0129 0.983  
Adsorbentkt(mg/g min−1/2)C(mg/g)R2
Intra-particle diffusion(Step I) 
Zn(II)-loaded resin 50 mg/L 0.1014 0.03386 0.9753  
Zn(II)-loaded resin 100 mg/L 0.00445 0.05892 0.9969  
Zn(II)-loaded resin 200 mg/L 0.065 0.86 0.8799  
Intra-particle diffusion(Step II) 
Zn(II)-loaded resin 50 mg/L 7.72 × 10−4 1.2752 0.9592  
Zn(II)-loaded resin 100 mg/L 1.48 × 10−3 2.8744 0.9326  
Zn(II)-loaded resin 200 mg/L 3.13 × 10−3 5.401 0.9453  
Intra-particle diffusion(Step III) 
Zn(II)-loaded resin 50 mg/L 1.51 × 10−6 1.586 0.1035  
Zn(II)-loaded resin 100 mg/L 6.94 × 10−6 3.399 0.2849  
Zn(II)-loaded resin 200 mg/L 7.95 × 10−6 6.47 0.3658  
AdsorbentQm(mg/g)Qe(mg/g)k1(min−1)R2
Pseudo-first-order 
Zn(II)-loaded resin 50 mg/L 2.303 1.507 0.0722 0.9254 
Zn(II)-loaded resin 100 mg/L 4.892 3.315 0.0475 0.9649 
Zn(II)-loaded resin 200 mg/L 8.712 6.267 0.0593 0.9449 
AdsorbentQe(mg/g)k2(g/mg min)R2
Pseudo-second-order 
Zn(II)-loaded resin 50 mg/L 1.577 0.0648 0.990  
Zn(II)-loaded resin 100 mg/L 3.486 0.0196 0.991  
Zn(II)-loaded resin 200 mg/L 6.571 0.0129 0.983  
Adsorbentkt(mg/g min−1/2)C(mg/g)R2
Intra-particle diffusion(Step I) 
Zn(II)-loaded resin 50 mg/L 0.1014 0.03386 0.9753  
Zn(II)-loaded resin 100 mg/L 0.00445 0.05892 0.9969  
Zn(II)-loaded resin 200 mg/L 0.065 0.86 0.8799  
Intra-particle diffusion(Step II) 
Zn(II)-loaded resin 50 mg/L 7.72 × 10−4 1.2752 0.9592  
Zn(II)-loaded resin 100 mg/L 1.48 × 10−3 2.8744 0.9326  
Zn(II)-loaded resin 200 mg/L 3.13 × 10−3 5.401 0.9453  
Intra-particle diffusion(Step III) 
Zn(II)-loaded resin 50 mg/L 1.51 × 10−6 1.586 0.1035  
Zn(II)-loaded resin 100 mg/L 6.94 × 10−6 3.399 0.2849  
Zn(II)-loaded resin 200 mg/L 7.95 × 10−6 6.47 0.3658  
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