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(a) Adsorption isotherms of IC on raw Manihot residue, TiO2 and carbon C800 at 25 °C. Adsorbent dose: 33.3 mg·cm−3; (b) Variation in the pH of the IC solution as well as of the surface of TiO2 and the carbon C800 after adsorption of different concentrations of IC. The levels of pHpzc of the materials are denoted with dashed lines.
