Table 3.

Comparison of root mean square error (RMSE) values of pseudo-first-order (PFO) and pseudo-second-order (PSO) models for roxarsone adsorption with various adsorbents at 21 °C at pH 7.00 in water at variable time intervals.

Adsorbents	PFO	PSO
Mag-P	4.76 × 10−4	7.95 × 10−3
Mag-C	4.55 × 10−2	4.50 × 10−2
CM-19	3.97 × 10−1	3.97 × 10−1
GAC	9.93 × 10−3	1.01 × 10−2
Goethite	3.50 × 10−2	2.44 × 10−2