Adsorption Efficiency of Polyaspartate-Montmorillonite Composite Towards the Removal of Pb(II) and Cd(II) from Aqueous Solution

Journal Article · Thu Feb 15 04:00:00 EST 2018 · Journal of Polymers and the Environment

DOI:https://doi.org/10.1007/S10924-017-0958-9· OSTI ID:22788265

El-Hefnawy, Mohamed E. ^[1]; Gemeay, Ali H. ^[2]

---

1. King Abdulaziz University, Department of Chemistry, Science and Art College (Saudi Arabia)
2. Tanta University, Department of Chemistry, Faculty of Science (Egypt)

The selective modification of sodium montmorillonite (Na{sup +}-Mt) surface with polyionene followed by poly (succinimde-co-aspartate) has been considered. Na{sup +}-Mt was allowed to react with well characterized polyionene in two fold excess. The resulting polyionene/Mt (IC) was further modified with poly (succinimide-co-aspartate) through an ion exchange process. The obtained polyaspartate/Mt (IPS) composite was characterized by elemental analysis, X-ray diffraction, FTIR spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and BET surface analyzer. The adsorption efficiency of IPS composite was investigated for the removal of Pb(II) and Cd(II) from aqueous solution under different experimental conditions including initial metal ions concentration, temperature and single and binary mixture systems of metal ions. The experimental data were analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. Langmuir model reveals that the monolayer adsorption capacity of IPS was 92.59 and 67.57 mg/g for Pb(II) and Cd(II), respectively. The modification of parent Na{sup +}-Mt enhanced their adsorption capacity by about 87.91 and 29.84% for Pb(II) and Cd(II), respectively, due to inclusion of extra active sites of polyaspartate. The mean sorption energy, E calculated from Dubinin–Radushkevich isotherm were 2.75 and 1.98 kJ/mol for the adsorption of Pb(II) and Cd(II), respectively, indicating physical adsorption process. Also, The thermodynamic parameters were calculated and indicated that the adsorption was spontaneous and exothermic process. The mechanism of cation exchange and complexation of metal ions was suggested. IPS composite has a considerable potential for the removal of heavy metal ions from aqueous solution and wastewater stream.

• OSTI ID: 22788265
• Journal Information: Journal of Polymers and the Environment, Journal Name: Journal of Polymers and the Environment Journal Issue: 2 Vol. 26; ISSN 1566-2543
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AQUEOUS SOLUTIONS
BINARY MIXTURES
CADMIUM
CONCENTRATION RATIO
EXPERIMENTAL DATA
FOURIER TRANSFORM SPECTROMETERS
HEAVY METALS
ION EXCHANGE
ISOTHERMS
LEAD
MONTMORILLONITE
SCANNING ELECTRON MICROSCOPY
SODIUM COMPOUNDS
SODIUM IONS
STREAMS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMICS
WASTE WATER
X-RAY DIFFRACTION