Equilibrium and Kinetic Studies of Phosphate Adsorption Onto Corn Straw Char Supported Nano Ferric Oxide Composite
文献类型： 外文期刊
作者： Zhou, Hongguang 1 ; Jiang, Zhenmao 1 ; Wei, Shiqiang 1 ;
作者机构： 1.Southwest Univ, Coll Resources & Environm, Chongqing Key Lab Agr Resources & Environm, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Chongqing 400716, Peoples R China
关键词： Adsorption;Nano-FeOOH Composite Corn Straw Char;Phosphate;Final Temperature;Heating Rate
期刊名称：Science of Advanced Materials （ 影响因子：0.9； 五年影响因子：0.7 ）
ISSN： 1947-2935
年卷期： 2015 年 7 卷 9 期
页码：
收录情况： SCI
摘要： Phosphate removal from aqueous solution was investigated using nano-FeOOH composite biomass char developed from corn straw, an agricultural solid waste. The composite char was obtained by a procedure of "pyrolysis-metal complex anion incorporation-precipitation." The saturated adsorption capacity of composite obtained under different conditions varied 28.8 similar to 37.3 mg Pig. Either higher final temperature or higher heating rate may decrease the adsorption capacity of composite absorbents. The removal efficiency reached maximum in the pH range of 3 similar to 6. Adsorption capacity increased with the adsorption temperature increasing and decreased with pH increasing. The adsorption equilibrium data well followed both Langmuir and Freundlich isotherms, and the constant n(-1) values in Freundlich equation between 0 and 1 indicated a strong adsorption. The adsorption kinetics dada following pseudo-second-order model indicated that the adsorption process was dominated by chemisorption. The excellent adsorption ability even at very high concentrate additive ions level as well as the low desorption ratio further supported the occurrence of chemisorption between phosphate and the composite. Thus, the adsorption mechanisms may involve both ion exchange and chemisorption.
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