Hollow Hyper-Cross-Linked Polymer Microspheres for Efficient Rhodamine B Adsorption and CO2 Capture

Herein, we prepared a series of hollow hyper-cross-linked polymer (HCP) microspheres with a hollow core–shell structure via the hard-template method, and the as-prepared HCPs were employed for rhodamine B (RB) adsorption and CO 2 capture. The results indicate that the porosity of the HCPs can be easily tuned and the hollow microspheres are favorable for the fast mass transfer of RB in the pore channels; accordingly, the adsorption equilibrium can be attained quickly. In addition, the hollow microspheres are helpful for increasing the equilibrium capacity. The RB adsorption shows that HCPs-5% holds the best capacity (1400 mg/g) and acceptable equilibrium time (60 min). On the other hand, the CO 2 adsorption exhibits that HCPs-5% holds the highest CO 2 uptake (99.0 mg/g) and the ultramicropores play important roles in the adsorption. The HCPs hold moderate isosteric heat of CO 2 adsorption (24.4–35.0 kJ/mol) and exhibit excellent recycling performance.