Nonthermal plasma induced NiS/UiO-66-NH2 for boosting visible-light photo-Fenton degradation of tetracycline hydrochloride.

Heterojunctions constructed from metal organic frameworks (MOF) and metal sulfides are the potential candidates for solar-light driven photo-Fenton elimination of antibiotics from wastewater. To boost the solar-light induced photo-Fenton degradation of tetracycline hydrochloride (TCH) over UiO-66, NH 2 -functionlized UiO-66 (UiO-66-NH 2) was in-situ loaded with NiS (NiS/NU-66) via the nonthermal plasma sulfurization. For comparison to UiO-66-NH 2 , NiS/NU-66 had the lower adsorption capacity while the higher photo-Fenton activity for TCH removal. The removal efficiency of NiS/NU-66 climbed and then declined with an increase in NiS content, and the best removal efficiency (84.92 ± 2.55 %) for 110 mg L−1 TCH solution was obtained by c-NiS/NU-66 in 150 min. The sulfur and oxygen defects as well as the plentiful functional groups over NiS/NU-66 were favorable for providing the abundant vacant sites of TCH adsorption and photons capture. In addition, the rapid separation and migration of photo-generated e−/h+ pairs were achieved at the tight junction interface between NiS and UiO-66-NH 2 , enlarging the visible-light absorption capacity. In NiS/NU-66-assisted photocatalytic system, H 2 O 2 was efficiently convert to •OH by e− and Ni2+/Ni3+ couples in solar light region. Hence, •OH, •O 2 − and h+ played the vital roles in this photo-Fenton system. [Display omitted] • NiS/UiO-66-NH 2 was fabricated by the in-situ nonthermal plasma sulfurization. • Lattice defects and functional groups favored the adsorption and photo-Fenton reaction. • NiS/UiO-66-NH 2 enhanced the photo-Fenton activity while reduced the adsorption capacity. [ABSTRACT FROM AUTHOR]