Removal of Organochlorine Pesticides from Aqueous Solution by Using Neutralized Red Mud

Küçük Resim Yok

Tarih

2011

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

WILEY

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

This work describes the potential usability of neutralized red mud for the removal of organochlorine pesticides (OCPs) from aqueous solutions. After examination on the adsorption capability of neutralized red mud for all studied OCPs, the experiments were performed by employing aldrin as a model compound. The effect of several parameters, such as contact time, pH of the solution, initial aldrin concentration, and dosage of the adsorbent was evaluated by batch experiments. The determination of OCPs was carried out using traditional liquid-liquid extraction followed by a GC coupled with mu-electron capture detector (GC-mECD). The results showed that adsorption equilibrium time depended upon the initial aldrin concentration and adsorption followed the second-order kinetic model. Kinetic study also indicated that the film diffusion mechanism was a main rate control mechanism. The removal was explained by considering the electrostatic interactions between metal oxides surface of the neutralized red mud and inductively charged centers (negative charge (d-) of chlorine atoms and positive charge (d+) of pi-cloud aromatic ring) of the aldrin molecules. In comparison to the Langmuir isotherm model, the Freundlich model better represented the adsorption data. The neutralized red mud was also succesfully employed for the removal of OCPs from real water samples, including tap water and surface (lake) water, fortified with studied OCPs.

Açıklama

Anahtar Kelimeler

Adsorption, Aldrin, Organochlorine pesticides, Red mud

Kaynak

CLEAN-SOIL AIR WATER

WoS Q Değeri

Q1

Scopus Q Değeri

Q3

Cilt

39

Sayı

11

Künye