柚子皮对水中六价铬的吸附性能研究

采用柚子皮制备生物吸附剂用于去除水中的Cr(VI),考察了p H值、柚子皮投加量、柚子皮粒径、溶液离子强度、反应温度等因素对吸附效果的影响。结果表明,当溶液中Cr(VI)离子初始浓度15mg/L、p H 1.5、反应温度25℃、柚子皮投加量1.0g/100 m L、吸附时间7 h时,Cr(VI)离子去除率可达90%以上。柚子皮对Cr(VI)离子的吸附过程可以用Langmuir和Freundlich吸附等温模型来描述,吸附等温线线性相关性均较显著,吸附过程符合准二级动力学方程。柚子皮对水中Cr(VI)离子吸附性能较好,且运行成本低,可推广应用于水中重金属离子的治理。

Study on adsorption of Cr(VI)in water by shaddock peel

A biological adsorbent was prepared with shaddock peel to remove Cr(VI) in water. The effects of pH, the dosage and particle size of the shaddock peel, the ionic concentration of the solution and reaction temperature on the adsorption of Cr(VI) by shaddock peel were investigated. The results indicate that under the adsorption conditions of an initial concentration of Cr(VI) 15mg/L, pH 1.5, reaction temperature 25℃, a dosage of shaddock peel 1.0g/100mL and a reaction duration of 7 hours, the removal rate of Cr(VI) can reach over 90%. The adsorption process can be described well by Langmuir and Freundlich adsorption isotherm models with the linear correlations being significant. The adsorption reaction was found to follow pseudo second order kinetics equation. The shaddock peel can effectively remove Cr (VI) in water with low cost, which can be applied to remove heavy metal ions in water.