Adsorption of 4-Chloro-2-nitrophenol onto Nano-ZnO

Journal of Physical Chemistry & Eleectrochemistry

مقاله 3، دوره 3، شماره 2، مهر و آبان 2015، صفحه 183-187   

نوع مقاله: Research Paper

تاریخ دریافت: 20 مهر 1392،  تاریخ پذیرش: 20 مهر 1392 

چکیده

Nano-ZnO was employed for the adsorption of 4C2NP from aqueous solutions in batch equilibrium
experiments to investigate its adsorption properties. The quantity of 4C2NP adsorbed onto nano- ZnO
surface was measured by UV-Vis spectrophotometer. The effects of contact time, adsorbent dose, pH, and
initial concentration of 4C2NP were investigated. The adsorption found to be strongly influenced by all the
above parameters. The optimized conditions for maximum amount of adsorption were also determined.
The results showed that adsorption of 4C2NP by nano-ZnO reached to equilibrium after 60 minutes and
maximum 4C2NP removal (46.5 %) was observed at pH =6. Also, removal efficiency of 4C2NP decreased
by increasing the initial concentration. Experimental data were analyzed by Langmuir and Freundlich
isotherms. Experimental results indicated that the equilibrium adsorption data fitted well in the Freundlich
isotherm equation with a correlation coefficient equal to 0.995.

کلیدواژه‌ها

Nano-ZnO؛ 4-Chloro-2-nitrophenol؛ Isotherm؛ Adsorption؛ catalyst