Synthesis, Modification And Immobilization Of Copper Benzene-1,3,5-Tricarboxylate For The Removal Of Methylene Blue In Wastewater
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Date
2020-07
Authors
Siew, Wei Yuan
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains malaysia
Abstract
A series of green synthesis methods were applied to synthesize
[Cu3(BTC)2(H2O)3]n (CuBTC). The established method uses only water as the
synthesis solvent and it is able to be carried out at room temperature. By applying the
same synthesis system, a second compound, Cu2(OH)(BTC)(H2O)2H2O was
successfully synthesized by altering the synthesis procedure. These compounds were
subjected to the removal of methylene blue (MB) dye. CuBTC shows greater
adsorption capability compared to Cu2(OH)(BTC)(H2O)2H2O as CuBTC exhibits
higher BET surface area and pore volume. Two different approaches were used to
further enhance the performance of the adsorbent which are the preparation of
polyhydroxybutyrate-CuBTC (PHB-CuBTC) composite and altering the metal center
of CuBTC by adding different amounts of iron into the metal center to produce
bimetallic organic frameworks (BMOFs). All samples were subjected to N2
adsorption-desorption analysis, scanning electron microscope (SEM), and Fourier
transform infrared spectroscopy (FTIR). Presence of PHB promotes the adsorption of
MB, thus PHB-CuBTC composites (24.49 mg/g) shows greater adsorption capacity
when compared to CuBTC (16.03 mg/g). The addition of polyvinylpyrrolidone (PVP)
into PHB-CuBTC allows small amount of methyl orange (MO) adsorption and reduced
the time required to achieve adsorption equilibrium for MB adsorption as compared to
PHB-CuBTC. Subsequently, a series of Cu-Fe-BTC were successfully synthesized.
Description
Keywords
Copper Benzene , Methylene Blue