Batch adsorption experiments were performed by adding 0.2g CMPS to 250mL conical flasks containing 100mL
solutions with 100mg/L cadmium ion concentrations. The effect of pH on adsorption was studied in the range of
2.0-8.0 (when pH was above 8.0, the precipitation was generated in the solutions), and pH was adjusted with 0.1M
NaOH and 0.1M HCl. Then, the samples were agitated on a concussion incubator at 150rpm for a certain time. The
experiments were carried out at indoor temperature (25℃ )