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Contact time effect for the Ce(III) ions sorption on commercial chitin, chitin obtained from H. illucens adults (Ch-A), chitin derived from H. illucens puparia (Ch-P), the ground form of H. illucens adults (A), the ground form of H. illucens puparia (P), high-molecular-weight commercial chitosan (CS-HW), medium-molecular-weight commercial chitosan (CS-MW), and low-molecular-weight commercial chitosan (CS-LW) (C0 50 mg·L−1, pH 3.0, t 1–300 min., T 25 °C, 180 rpm).
