Adsorption of methyl orange (MO) by Zr (IV)-immobilized cross-linked chitosan/bentonite composite

- Zr-CCS/BT composite was prepared and characterized.
- The adsorption of MO onto the Zr-CCS/BT composite followed the Langmuir isotherm model.
- The pseudo-second-order model described the adsorption kinetic behavior.
- The maximum adsorption capacity was 438.6 mg/g at 303 K and natural pH.