LAUSR

Abstract The Bohart–Adams model was preferred for the modeling of water pollutants adsorption in a fixed-bed column. However, its fitting quality was increasingly questioned. Chu proposed that a poor fit was caused by the severe simplification of the Bohart–Adams model [1]. In fact, our previous work has proved that the Bohart–Adams model changed from a logistic function to an exponential function in mathematical nature after oversimplification [2]. To better understand the Bohart–Adams model, this comment mainly addressed the following aspects: (1) Correct forms of the Amundson and original Bohart–Adams models; (2) Effects of the void fraction on the breakthrough curve; (3) Curve characteristics of the original Bohart–Adams model; (4) Rationality of simplification for the original and fractal-like Bohart–Adams models. This work is expected to help readers to better understand the original Bohart–Adams model.