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- Title
Simultaneous Removal of Pesticides from Water by Rice Husk Ash: Batch and Column Studies.
- Authors
Saha, Ajoy; Gajbhiye, V. T.; Gupta, Suman; Kumar, Rajesh; Kumar Ghosh, Rakesh
- Abstract
The present study evaluated rice husk ash (RHA) as an adsorbent for simultaneous removal of a mixture of seven different pesticides (alachlor, metolachlor, chlorpyriphos, fipronil, α-endosulfan, /β-endosulfan, and p,p'-DDT) and two metabolites (p,p'-DDE and endosulfan sulfate) from water. The adsorbent RHA was prepared in the laboratory and characterized by techniques such as X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy/energy-dispersive X-ray spectrometry. Adsorption kinetics were well described by the pseudo-second-order kinetic model. The Freundlich isotherm model fitted the equilibrium data better than the Langmuir model, and the maximum sorption capacity varied from 0.078 to 0.166 mg/g. The column elution studies showed that 10 L of mixed pesticide-contaminated water (0.05 mg/L) can be treated with only 10 g of RHA at a removal efficiency of 90%. The results implied that RHA can be used as a low-cost, easily available, and efficient adsorbent for the simultaneous removal of pesticides from contaminated water.
- Subjects
PESTICIDE pollution; RICE hulls; RICE residues; ENDOSULFAN; WATER pollution
- Publication
Water Environment Research (10614303), 2014, Vol 86, Issue 11, p2176
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143014X14062131178358