农业环境科学学报Issue(12)：2364-2371,8.DOI:10.11654/jaes.2015.12.016
改性小麦壳对水溶液中Cd2+的吸附研究
Adsorption of Cd2+from Aqueous Solution by Modified Wheat Chaff
摘要
Abstract
As an agricultural waste, wheat chaff was modified with NaOH and KMnO4 solution, and used for removing Cd2+from aqueous so-lution. 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.关键词
小麦壳/高锰酸钾/改性/吸附/镉/影响因素Key words
wheat chaff/KMnO4/modification/adsorption/cadmium/influencing factors分类
资源环境引用本文复制引用
梁东旭,罗春燕,周鑫,陈红春,程雨薇,邓仕槐..改性小麦壳对水溶液中Cd2+的吸附研究[J].农业环境科学学报,2015,(12):2364-2371,8.基金项目
四川省青年创新团队项目（2014TD0019）；教育部长江学者和创新团队发展计划（IRT13083）；四川省科技支撑计划 （）
