alexa Removal of Nitrate and Nitrite Anions from Wastewater U
ISSN: 2161-0525

Journal of Environmental & Analytical Toxicology
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Research Article

Removal of Nitrate and Nitrite Anions from Wastewater Using Activated Carbon Derived from Rice Straw

Hassan A Hanafi1,2* and Sami M Abdel Azeema2,3
1Cyclotron Project, Nuclear Research Centre, Atomic Energy Authority PN, 13759, Cairo, Egypt
2College of Science and Humanities, Al-Quwayiyah-Shaqra University- KSA, Saudi Arabia
3Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt
Corresponding Author : Hassan A. Hanafi College of Science and Humanities, Al-Quwayiyah-Shaqra University-KSA, Saudi Arabia, Tel: 966116224481; E-mail: [email protected]
Received October 29, 2015; Accepted December 31, 2015; Published January 04, 2016
Citation:Hanafi HA, Azeema SMA (2016) Removal of Nitrate and Nitrite Anions from Wastewater Using Activated Carbon Derived from Rice Straw. J Environ Anal Toxicol 6:346. doi:10.4172/2161-0525.1000346
Copyright: ©2016 Hanafi HA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Rice straw (RS) has been activated using Na2CO3. Activated carbon samples (ARSC) were characterized using N2- adsorption, elemental analysis, surface fractional dimension and pore volume to support the adsorption of nitrate and nitrite ions. The effects of various parameters such as solution pH, adsorbent concentration, contact time, temperature and initial nitrate and nitrite concentrations were examined. Various kinetics models including the Pseudo-first-order, Pseudo-second-order and intra particle diffusion models have been applied to the experimental data to predict the adsorption mechanism. The thermodynamics constants of the adsorption process, viz. ΔHo, ΔGo and ΔSo were evaluated. The results showed that the adsorption of nitrate and nitrite ions onto activated carbon was exothermic and non-spontaneous. The adsorption data followed second-order kinetics supporting that chemisorption process was involved. The obtained results show that ARSC can be used as an effective and natural low-cost adsorbent for the removal of nitrate and nitrite anions from wastewater.

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