The porphyrin ring and the zirconium cluster contribute to the rapid, efficient and pH-dependent adsorption of antimony by PCN-222.

2 nm Sb2S3 particles embedded in a mesoporous carbon framework by an adsorption method to construct a high performance anode material.

In recent years, the removal of antimony­(III) (Sb­(III)) contaminant from water has caused widespread concern. Herein, two adsorbents have been successfully developed to remove Sb­(III) from water and systemically characterized. One is the composite of magnetic mesoporous carbon nanospheres (Fe3O4@CNs) with Fe2O3 particles that is represented as Fe3O4@Fe2O3@CNs, and the other one is mesoporous carbon nanosphere-accommodated Fe2O3 particles noted as Fe2O3@CNs. Both adsorbents have the advantages of magnetic separation and high Sb­(III) removal capacity. The adsorption properties of Sb­(III) on both adsorbents were studied by the experiments of adsorption isotherms and kinetics. The results show that the adsorption behaviors on both adsorbents follow the Langmuir isotherm model and pseudo-second-order kinetic model. The maximum Sb­(III) adsorption capacity of Fe3O4@Fe2O3@CNs and Fe2O3@CNs is 234.28 and 102.84 mg/g, respectively. The high capacity can be attributed to the adsorption-active Fe2O3 particles that are well confined inside the carbon matrix. Furthermore, it is also of great research value to turn the adsorbed Sb­(III) into resources utilization. We developed the subsequent treatment of the waste adsorbents, which were manufactured to magnetically recoverable catalysts for the esterification and 1,2,3-triazoles synthesis, respectively, and both of them exhibited good catalytic activity. It provides a promising candidate for avoiding the secondary pollution of Sb­(III).

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