Abstract
In the present study melamine–formaldehyde-tetraoxalyl-ethylene diamine (MFT) covered activated carbon (MFT/AC) was prepared by the use of ultrasonic waves. The prepared materials were examined by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The results showed that MFT was symmetrically covered the surface of the activated carbon. MFT/AC was examined for the removal of chromium and zinc ions from their aqueous solution in the presence and absence of ultrasonic waves. The effects of initial pH of the heavy metal solution, ultrasonic time and ultrasonic frequency on the efficiency of the removal were studied. The results showed that, using ultrasonic waves of 210 KHz for sonication time 30 minutes showed higher removal efficiency towards Cr3+ and Zn2+ ions than unsonicated treatment. The removal of Cr3+ ions was higher than that of Zn2+ ions. The removal process was done via chelating with MFT in the prepared carbon composite
Highlights
Heavy metals and other toxic pollutants are considered extremely pernicious because they are toxic, non-degradable, and environmentally persistent
Melamine-formaldehyde-tetraoxalyl-ethylenediamine chelating resin modified active carbon (MFT/activated carbon (AC)) was prepared as follow [22]. 5 gm of AC was immersed in a 5 mmol/L of ethylene diamine for 5 hrs, the mixture was ultrasonically agitated for 30 min under a flow of N2 to form amine-AC. 5 gm of amine-AC was immersed in a solution including 1.5 g tetraoxalyl ethylenediamine and 1.8 g melamine, 20 mL 15% formaldehyde and 0.1 g sodium dodecyl sulfate with 4 hr immersion
From the obtained results we can concluded that Using ultrasonic waves in the preparation of melamine-formaldehyde-tetraoxalyl-ethylene diamine covered activated carbon (MFT/AC) enhances its ability for removing chromium and zinc ions from their aqueous solution
Summary
Heavy metals and other toxic pollutants are considered extremely pernicious because they are toxic, non-degradable, and environmentally persistent. Pollution by heavy metals ions due to intense industrial activity results in the accumulation of these toxic effluents in biosphere especially water sources. Zinc is released into the aquatic environment through several industrial activities, such as mining, metal coating, battery production and its use in paints, ceramics, wood, fabrics, drugs, sun block sand deodorants [5,6,7]. Human exposure to these heavy metals at significant levels is associated with serious health effects. Carbon could be activated by several methods including acid or base treatment, salt treatment, use of microwaves and ultrasonic waves
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