期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 222, 期 -, 页码 487-494出版社
ELSEVIER
DOI: 10.1016/j.molliq.2016.07.090
关键词
Rice husk ash; Tetracycline; Isotherms; Thermodynamics; Kinetics
资金
- National Natural Science Foundation of China [41473071, 41101287]
- High Level Talent Project of Six Talents Summit in Jiangsu Province [JNHB-008]
- Major Project of College Natural Science Foundation of Jiangsu Province [16KJA610001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [164320H116]
As an agricultural waste, rice husk ash (RHA) has the potential to be a viable alternative adsorbent for the removal of tetracycline (TC) from aqueous solution. This study aims to explore its feasibility of RHA as a new adsorbent, and understand its adsorption mechanism for TC. Also assessed in this study are the influences of initial concentration of TC, adsorption time, solution pH and temperature on RHA adsorption performance. It is found that TC removal efficiency of RHA is related to the initial concentration of TC solution. TC concentration decreases sharply within the first 60 min in its adsorption process, and then only gradually, reaching the equilibrium within 600 min. RHA adsorption capacity is related to solution pH, temperature, and ion intensity, especially at a high pH value. A rise of 313 K in temperature caused the adsorption capacity to more than double. Furthermore, low-acid and high-alkaline solution can accelerate the adsorption of TC onto RHA. The highest adsorption capacity of 8.37 mg/g achieved in this study is much higher than other adsorbates reported in the literature, indicating the feasibility of RHA as a new adsorbent. The Langmuir isotherm model is the most reasonable in depicting the adsorption behavior. The pseudo second order model fits the experimental data nicely, suggesting a mostly physical and chemical control over the adsorption. Such findings can serve as a useful guide in expanding the applicability of RHA to new areas. (C) 2016 Elsevier B.V. All rights reserved.
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