  With the rapid industrial development, many dye pollutants have entered the
water, along with heavy metals like As, leading to complex pollution that
threatens the ecological environment and human health. Therefore, designing an
effective strategy for treating complex dye wastewater is urgent. Herein, we
have constructed high-purity pyrite FeS$_2$ nanoplates as bifunctional
catalysts for the simultaneous removal of dyes and arsenite (As(III)).
