Activation of peroxymonosulfate by 2D-3D De@NiFe LDH for efficient removal of tetracycline

In this work, a 2D-3D activator De@NiFe-LDH was constructed by in-situ growth of 2D NiFe layered double hydroxide (NiFe-LDH) on the surface of 3D diatomaceous earth (De). The analysis of SEM, XRD, FTIR, XPS and BET were used to characterize the samples. The as-prepared De@NiFe-LDH achieved 99.4 % removal of tetracycline hydrochloride (TC) via activation of peroxymonosulfate (PMS). Singlet oxygen ( 1 O 2 ) was verified as dominant reactive oxygen species responsible for TC removal via quenching tests. Mechanism investigation suggested that the redox cycles of Ni 2+ /Ni 3+ and Fe 2+ /Fe 3+ on the surface of De@NiFe-LDH were crucial for PMS activation. In addition, the reasonable reusability and versatility of De@NiFe-LDH as well as low-toxicity of treated water endowed the De@NiFe-LDH/PMS system with a wide range of applications.