Recently, the research team led by Prof. Kong Lingtao from Institute of Solid State Physics, Hefei Institutes of Physical Science (HFIPS) prepared a highly active single iron atom catalyst (Fe-ISAs@CN) which can activate HNO2 to generate free radicals, achieving rapid removal of sulfadiazine pollutants in aqueous solutions. The relevant results were published in the Journal of Colloid and Interface Science.