Dec 1, 2021 · TCMH residues (obtained from a pharmaceutical factory in Tianjin, China) including Chinese wolfberry residue (CWR) and Chuanxiong rhizome residue (CRR). Adsorbent preparation: air and oven dried, smashed and sieved (particle size: 0.15–0.45 mm); adsorption: initial pH 2.0, 27 °C, initial Cr(VI) concentration = 50–400 mg/L, adsorbent dose