Dec 1, 2021 · Recently, chuanxiong rhizome residue (CRR) and Chinese wolfberry residue (CWR) after extraction could be used as adsorbent for adsorption of hexavalent chromium (Cr(VI)) that the Cr(VI) removal efficiencies could be higher than 98 and 85%, and the highest adsorption capacities were 37.30 and 32.42 mg/g, respectively (Chen et al., 2017). In