Photothermal-enhanced adsorption system based on ZIF-67-derived CoS2/MoS2 and MXene-functionalized biomass carbon aerogel for efficient removal of strontium and cesium from aqueous matrices
The effective removal of radioactive Sr 2+ and Cs + ions from wastewater is crucial for environmental remediation. Herein, a novel solar-enhanced adsorption platform based on a CoS 2 /MoS 2 /P-MXene/C composite aerogel has been developed that can efficiently remove Sr 2+ and Cs + ions. The constructed CoS 2 /MoS 2 heterointerface provides abundant active regions, while the hierarchical porous structure of the aerogel promotes the rapid transfer of ions and water molecules. In particular, the superior photothermal conversion ability of the CoS 2 /MoS 2 /P-MXene/C makes it capable of capturing solar energy for local heating effect, thereby increasing ion diffusion and accelerating mass transfer. This photothermal feature can greatly enhance the adsorption kinetics through the evaporation of the solution and the ion concentration at adsorption sites. The equilibrium of both Sr 2+ and Cs + was reached within 1 h under one-sun illumination. The measured maximum adsorption capacities were 98.7 and 150.6 mg/g for Sr 2+ and Cs + ions, respectively. In addition, it has excellent selectivity and recyclability as well as high performance in high-salinity solution. The CoS 2 /MoS 2 /P-MXene/C also shows promising potential in the fields of solar-driven seawater desalination and purification of wastewater containing dyes due to the multi-functionality. This work not only engineers an efficient adsorbent for treating nuclear wastewater, but also presents a generic design strategy for multifunctional adsorption system enhanced by external fields for environmental applications.
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