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| Adsorption of Cd2+ from Aqueous Solution by Modified Wheat Chaff |
| Received:June 07, 2015 |
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| KeyWord:wheat chaff;KMnO4;modification;adsorption;cadmium;influencing factors |
| Author Name | Affiliation | E-mail | | LIANG Dong-xu | Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | LUO Chun-yan | Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | ZHOU Xin | Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | CHEN Hong-chun | Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | CHENG Yu-wei | Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | DENG Shi-huai | Sichuan Key Laboratory of Agricultural Environmental Engineering, College of Environment, Sichuan Agricultural University, Chengdu 611130, China | shdeng8888@163.com |
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| Abstract: |
| As an agricultural waste, wheat chaff was modified with NaOH and KMnO4 solution, and used for removing Cd2+ from aqueous solution. Cadmium adsorption and its influencing factors, including rate, pH, temperature, time and coexisting ions, were investigated. The surface characteristics of wheat chaff was obviously modified by NaOH and KMnO4, thus promoting adsorption. The adsorption capacity of the modified wheat chaff increased by 9.30 times, as compared with original wheat chaff. The maximum adsorption capacity was up to 26.74 mg·g-1. The optimized adsorption conditions were 2.0 g·L-1 wheat chaff, pH 5.0~8.0, and temperature 25 ℃。 However, the presence of Na+ and Ca2+ exhibited a negative effect on Cd2+ adsorption. In addition, adsorption capacity increased along with increases in temperature. The adsorption equilibrium achieved within 60 min. The kinetics of adsorption was well described by the second-order kinetic adsorption model, while Langmuir model better fit the adsorption isotherms. The present results indicate that modification of wheat chaff with NaOH and KMnO4 not only produces an excellent agent for Cd2+ removal, but also offers a new way for recycling agricultural residues. |
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