胡萝卜渣对Cu^2＋的吸附作用及吸附机理

摘要

通过静置吸附试验,研究了胡萝卜渣对铜离子吸附效果的影响因素及有关吸附机理。结果显示：吸附率随胡萝卜渣粒径的减小而增大,100目时胡萝卜渣对铜离子的吸附率可达76.35%;铜离子溶液初始浓度相同时,吸附率随胡萝卜渣加入量的增加而增大,而胡萝卜渣加入量相同时,对不同浓度的铜离子溶液吸附率均出现一次最小值;在铜离子的初始浓度为10mg/L和胡萝卜渣用量为0.5g时,对pH值、温度和浸泡时间3种因素,在6水平上进行了正交试验,最佳吸附条件为废水的pH值为2、温度为40℃、浸泡的时间为3h;20℃和40℃时铜离子的吸附等温线结果表明,胡萝卜渣对铜离子的吸附以单分子层吸附占优势,吸附等温线较好地符合Freundlich吸附等温式;铜离子的吸附动力曲线结果表明,胡萝卜渣对铜离子的吸附动力学行为比较符合二级动力学模型。%In order to provide a cheap and effective heavy metal ion adsorbent,carrot slag has been used to adsorb copper ions in aqueous solution.Results show that copper ion adsorption rate increases when using a smaller size of carrot slag.The adsorption rate for carrot slag can reach 76.35%at-100 mesh.Different quality carrot slag on different initial concentration copper ions adsorption experiments show that：under the same copper ions initial concentration, addition of more carrot slag results in a higher copper ion adsorption rate.At a constant carrot slag amount different concentrations of copper ions adsorption rate all appear a minimum value.When copper ions initial concentration is 10.0mg/L and the amount of carrot slag is 0.5g,3 factors 6 level orthogonal tests shows that;the optimum adsorption conditions for the wastewater pH is 2,the temperature is 40℃and soaking time is 3 hour.20℃and 40℃copper ion adsorption isotherm results show that：carrot slag on copper ions adsorption with single molecule layer absorption dominant,and adsorption isotherm is fit to Langmuir adsorption isotherm.The copper ions Dynamic adsorption curve results show that;second kinetic model can describe the adsorption kinetics of carrot slag.