期刊
ADSORPTION SCIENCE & TECHNOLOGY
卷 36, 期 5-6, 页码 1294-1309出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0263617418768944
关键词
Biochar; ammonium removal; adsorption; kinetic; isotherm; physical and chemical modification
资金
- Kafrelsheikh University
- Don State Technical University
Ammonium is a water pollutant that harms the environment, particularly fisheries. Rice straw is also an economic waste of rice, with millions of tons produced per year around the world. In this paper, physical and chemical procedures for the modification of rice straw were studied. The kinetic and isothermal adsorption trends were investigated, including the ammonium removal efficiency, the contact time of the adsorbent, the amount of adsorbent, and the initial concentration of NH4+. The effect of temperature and pH on the adsorption process was discussed. The removal efficiency of NH4+ recorded 43,53.7, and 69.5%, with maximum adsorption values of 2.9, 3.5, and 4.5 mg/g at temperatures of 25 +/- 5, 35 +/- 5, and 45 +/- 5 degrees C, respectively, at pH 7.5. The biochar obtained from rice follows the pseudo-second-order equation for ammonium adsorption kinetics (R-2=0.98). The adsorption isotherm follows Freundlich's model (R-2=0.99) and Langmuir's model (R-2=0.98).
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