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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 13, No. 2, 2016, pp. 733-742
Bioline Code: st16067
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 13, No. 2, 2016, pp. 733-742

 en Sorption, kinetics and thermodynamics studies of atrazine herbicide removal from water using iron nano-composite material
Ali, I.; ALOthman, Z.A. & Al-Warthan, A.


Atrazine organic pollutant has been found in several water resources of the world. It is highly toxic and carcinogenic in nature. Atrazine is removed by adsorption on iron composite nanoparticles. The composite nanoparticles were synthesized, analyzed and applied for atrazine uptake from water. Residual atrazine was monitored by gas chromatography–mass spectrometry. The maximum atrazine removal (95 %) was achieved using contact time 30.0 min, concentration 30.0 µg/L, pH 7.0, dose 2.5 g/L and temperature 20.0 °C. The adsorbent was selective for atrazine adsorption. The results obeyed Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms. ∆G° values were -6.05, -6.11 and -6.15 kJ/mol at 20, 25 and 30 °C temperatures, respectively. The value of ∆S° was -2.45 × 10-3 kJ/mol K. It showed decline in entropy of atrazine uptake. The adsorption followed pseudo-second- order kinetics. The adsorption mechanism was liquid film diffusion. The proposed adsorption method is inexpensive, fast and reproducible. It can be used to remove atrazine from any water sample/source.

Adsorption; Atrazine; Gas chromatography– mass spectrometry; Iron composite nanoparticles; Isotherms; Kinetics; Thermodynamics; Water treatment

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