Adsorption experiments 2000 g pure minerals were added into a ground Erlenmeyer with specific concentration and then diluted to 40.0 mL with distilled water. The solution pH was regulated before vibrating at room temperature for 120 min. The upper clear liquid was centrifuged and then transferred into a 100.0 mL volumetric flask. The supernatant was analyzed by Total Organic Carbon Analyser (TOC-VCPH) to calculate the adsorption capacity.