In Situ Growth of Ca²⁺-Based Metal-Organic Framework on CaSiO₃/ABS/TPU 3D Skeleton for Methylene Blue Removal

The work reports a novel strategy for combining polymers and metal-organic frameworks (MOFs) into composites for adsorption applications. Calcium silicate (CaSiO₃) was introduced into acrylonitrile butadiene styrene/thermoplastic polyurethane (ABS/TPU) alloy, and the CaSiO₃/ABS/TPU skeleton was fabricated by 3D printing technology. The Ca-MOF was directly loaded on the surface of acetone-etched 3D skeleton by in-situ growth method. The obtained 3D skeleton was characterized and the performance of methylene blue (MB) adsorption was determined. It is clear that Ca-MOF is successfully loaded on the surface of 3D skeleton due to the presence of CaSiO₃. The MB adsorption ratios of the solutions with initial concentrations of 50, 100 and 200 mg/L at the equilibrium time (5 h) are 88%, 88% and 80%, respectively, revealing good MB adsorption performance of the 3D skeleton. The MB adsorption ratio remains 70% at six runs of adsorption-desorption experiment, indicating the excellent recovering property of the skeleton. The results show that the prepared CaSiO₃/ABS/TPU 3D skeleton is a candidate adsorbent for printing and dyeing effluent treatment.