Abstract

Cadmium is a heavy metal toxic that enters water resources through industrial, household, agricultural waste and non-sanitary landfill of urban and industrial wastes. Pollution of water resources by cadmium increases incidence of diseases including Itai-Itai, kidney disorders, cancer, chromosome effects and kidney tubular damages in low exposures. The aim of this study is to study the efficiency of a new poly urea-formaldehyde adsorbent in the removal cadmium ions from aqueous solutions. The effect of different variables such as initial pH, contact time, initial concentration of cadmium and test of real wastewater samples were evaluated. In addition, laboratory data of cadmium adsorption by urea-formaldehyde adsorbent were matched to Langmuir, Freundlich and Temkin isotherm models. The results of the study showed that maximum adsorption capacity obtained by Langmuir model was 76.3?mg/g at pH?=?5.5. Laboratory adsorption data matched mostly by Freundlich isotherm model (R2 =0.999) which indicates that adsorption of cadmium ions on heterogenic surfaces of poly urea-formaldehyde happens by chemical adsorption mechanism. Generally, the results of the study showed that new poly urea-formaldehyde adsorbent can be efficiently used to remove highly concentrated cadmium ions from aqueous solutions.

Highlights

  • 2 mg/L cadmium was added to the real sample and they were put next to 1 gr adsorbent for 15 min under optimum pH conditions at 22–24 C and the amount of cadmium adsorption was determined by atomic adsorption spectroscopy method

  • X : Mean residual concentration after adsorption process in mg/L SD: Standard deviation RSD (%): Relative standard deviation N: Number of times that test performed In order to calculate the efficiency of cadmium removal by urea-formaldehyde equation (3) was used [1,2,3]

  • To study the isotherm of cadmium adsorption by urea formaldehyde polymer, Langmuir, Freundlich and Temkin adsorption isotherm models were used in optimum conditions

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Summary

Protocol Article

Adsorptive removal of noxious cadmium from aqueous solutions using poly urea-formaldehyde : A novel polymer adsorbent.

Environmental Chemical Engineering
Protocol data
Chemicals and materials
Adsorption tests
Cadmium removal in real samples
Data analysis
SD x
Effect of pH
Effect of contact time
Adsorption isotherms
Langmuir isotherm
Freundlich isotherm
Temkin adsorption isotherm
Study of cadmium removal in real samples
Full Text
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