Rhodamine B degradation by nanosized zeolitic imidazolate framework-8 (ZIF-8)

RSC Advances
Michael ChinFangyuan Tian

Abstract

Adsorption and photodegradation of rhodamine B by ZIF-8 nanocrystals were studied using spectroscopic techniques coupled with density functional theory (DFT) cluster calculations. A fast adsorption rate was observed in the dark, but upon exposure to visible light or UV irradiation the adsorption rate noticeably increased. Although several studies previously reported this phenomenon involving bulk ZIF-8 powder, this is the first mechanistic study to our knowledge that demonstrates adsorption and degradation of rhodamine B by nanosized ZIF-8 under various light conditions. The combined study of N2 sorption pore analysis and surface-sensitive X-ray photoelectron spectroscopy (XPS) confirmed the surface adsorption was mainly due to the open metal sites and surface groups of nanoporous ZIF-8. The fluorescence studies suggested ZIF-8 nanocrystals were able to generate hydroxyl radicals in water but only under UV illumination. The work presented here provides an insight into understanding nanoscale metal-organic frameworks (MOFs) in the removal of organic molecules from wastewater.

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Citations

Jun 3, 2021·Nanomaterials·Olivia L RoseCerasela Zoica Dinu
Aug 21, 2021·Journal of Hazardous Materials·Dandan LiJiwei Luo
Sep 22, 2020·ACS Applied Nano Materials·Alejandro Galán-GonzálezDel Atkinson

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Methods Mentioned

BETA
X-ray
fluorescence spectroscopy

Software Mentioned

CasaXPS
ImageJ
Casa
Gaussian

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