Adsorption of nitrate ions onto activated carbon prepared from rice husk by NaOH activation

作者：Zhang, Ying; Song, Xiao-Lan^*; Huang, Shu-Tao; Geng, Bai-Yang; Chang, Chi-Hsien; Sung, I-Yen

来源：Desalination and Water Treatment, 2014, 52(25-27): 4935-4941.

DOI：10.1080/19443994.2013.809984

• Activated carbon
• Rice husk
• Nitrate
• Adsorption

Precursor was prepared from rice husk under different carbonization temperatures. Then, activated carbon (AC) was synthesized by NaOH activation. The specific surface area of carbon increased with temperature rise up to 600 degrees C, but decreased rapidly over 600 degrees C. So, the AC obtained at 600 degrees C possessed the outstanding surface area of 2,802 m(2)/g. And, its adsorption activity of nitrate was carried out at initial concentration of 50-400 mg/L. The results showed that the maximum adsorption capacity and removal percentage of NO3- were 70.2 mg/g and 70.6%, respectively. Besides, the experimental data were evaluated by Langmuir, Freundlich, and Redlich-Peterson isotherms. In kinetic studies, it was observed that the results were well explained by the pseudo second-order model. In addition, the Gibbs free energy change of -17.0 kJ/mol indicated that the adsorption process was spontaneous.

• 出版日期2014
• 单位中南大学