Activated metal Bi and La modified SAPO-34 molecular sieve and its photocatalytic degradation of formaldehyde in aqueous solution

Abstract

As a new type of photocatalyst, molecular sieve photocatalysts have shown great promise in the degradation of organic matter in water bodies. In this paper, a new type of molecular sieve photocatalyst was successfully prepared by introducing Bi and La elements into the hydrothermal synthesis of SAPO-34 molecular sieve for the purpose of regulating the molecular sieve backbone. The introduction of active metals into the skeleton of molecular sieve can enrich the L acid sites on its surface, and at the same time, the introduction of active metals can accelerate the transfer rate of photogenerated carriers, which can also suppress the compounding rate of electron holes. It showed excellent performance in the photocatalytic degradation of formaldehyde, and the degradation rate constant k could reach 0.3222 min − 1 within 6 h. This study provides a new method for the preparation of molecular sieve photocatalysts and a new idea for the construction of bifunctional photocatalysts.