{Reference Type}: Journal Article
{Title}: Vacancy-Rich and Porous NiFe-Layered Double Hydroxide Ultrathin Nanosheets for Efficient Photocatalytic NO Oxidation and Storage.
{Author}: Li H;Zhu H;Shi Y;Shang H;Zhang L;Wang J;Li H;Zhu H;Shi Y;Shang H;Zhang L;Wang J;
{Journal}: Environ Sci Technol
{Volume}: 56
{Issue}: 3
{Year}: 02 2022 1
{Factor}: 11.357
{DOI}: 10.1021/acs.est.1c07811
{Abstract}: An appealing strategy in the direction of circular chemistry and sustainable nitrogen exploitation is to efficiently convert NOx pollutants into low-toxic products and simultaneously provide crop plants with metabolic nitrogen. This study demonstrates that such a scenario can be realized by a defect- and morphology-coengineered Ni-Fe-layered double hydroxide (NiFe-LDH) comprising ultrathin nanosheets. Rich oxygen vacancies are introduced onto the NiFe-LDH surface, which facilitate charge carrier transfer and enable photocatalytic O2 activation into superoxide radicals (•O2-) under visible light. •O2- on NiFe-LDH thermodynamically oxidizes NO into nitrate with selectivity over 92%, thus suppressing dangerous NO2 emissions. By merit of abundant mesopores on NiFe-LDH ultrathin nanosheets bearing a high surface area (103.08 m2/g), nitrate can be readily stored without compromising the NO oxidation reactivity or selectivity for long-term usage. The nitrate species can be easily washed off the NiFe-LDH surface and then enriched in the liquid form as easy-to-use chemicals.