Construction of bismuth based MOF for efficient removal of sodium diclofenac via adsorption and photocatalysis

Abstract

The mass production and widespread use of Pharmaceuticals and Personal Care Products (PPCPs) have posed a serious threat to the water environment and public health. In this work, a green metal-based Metal Organic Framework (MOF) Bi-NH 2 -BDC was prepared and characterized, and the adsorption characteristics of Bi-NH 2 -BDC were investigated with typical PPCPs—diclofenac sodium (DCF). It was found that DCF mainly covered the adsorbent surface as a single molecular layer, the adsorption reaction was a spontaneous, entropy-increasing exothermic process and the adsorption mechanisms between Bi-NH 2 -BDC and DCF were hydrogen bonding , π-π interactions and electrostatic interactions. In addition, Bi-NH 2 -BDC also had considerable photocatalytic properties, and its application in adsorbent desorption treatment effectively solved the problem of secondary pollution, achieving a green and sustainable adsorption desorption cycle.