TITLE:
Preparation of Fe-Mg MOFs and Its Application in Removal of RhB and MO
AUTHORS:
Onyeka Samuel Ojinna, Yueli Wen, Bin Wang, Chengda Li, Wei Huang, Ikeh Justin Tobechukwu
KEYWORDS:
Metal-Organic Frameworks (MOFs), Adsorption, Cationic and Anionic Dyes, Wastewater Treatment
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.10 No.4,
April
24,
2022
ABSTRACT: The world wide application of dyes in papermaking,
fabric, lithography, leather and other industrial production, has attracted
more attention, due to water pollution caused by these organic dyes.
Metal-organic frameworks (MOFs) which are a physical adsorption method of
wastewater treatment are a kind of special three-dimensional crystal-like
constituents built by multipurpose ligands and metallic ion classes, showing an
advantage in removal of pollutants from
solutions because of its unique properties are convenient for operation, high
removal efficiency, and low cost. In this study, we investigated Fe-Mg based metal organic framework, Fe-Mg MOFs which was directly synthesized by the hydrothermal method. The obtained materials
were analyzed with XRD, FT-IR, TG-DTG, SEM etc. and used for the
treatment of printing and dyeing wastewater. The results showed that it has
good adsorption performance for cation dye rhodamine B (RhB) and anion dye
methyl orange (MO) in a wide pH range. The
Fe-Mg MOF even after the 4th run, the Fe-Mg MOF catalyst still
maintained nearly the initial catalytic activities. The kinetic studies
revealed the adsorption process of the both contaminants obeys a pseudo-second
order model. In addition, the equilibrium adsorption data of RhB and MO are in
good agreement with Langmuir models. The maximum adsorption capacities are
694.44 and 236.97 mg/g at 308 K
respectively. This work synthesizes a promising dual-functional adsorbent that
can remove cationic and anionic dyes, which provide potential applications for
actual wastewater treatment.