Pb(Ⅱ)在改性龙眼壳活性炭上的吸附行为及机理研究  

Analysis on Adsorption Behavior and mechanism of Pb(Ⅱ)on Activated Carbon of Modified Longan Shell

作　　者：黄慧珍[1] HUANG Huizhen(School of Food Engineering,Zhangzhou Institute of Technology,Zhangzhou,Fujian 36300)

机构地区：[1]漳州职业技术学院食品工程学院,福建漳州363000

出　　处：《绵阳师范学院学报》2018年第11期64-68,共5页Journal of Mianyang Teachers＇ College

基　　金：福建省中青年教师教育科研项目(JA15686)

摘　　要：以甲醛/硫酸为改性剂,对龙眼壳活性炭进行改性制备吸附剂(LCSF),并用LCSF对模拟废水中的Pb(Ⅱ)进行吸附,考察了Pb(Ⅱ)初始质量浓度、p H值、吸附时间、吸附温度对铅吸附量的影响.结果表明LCSF提高了对Pb(Ⅱ)的吸附性能,最佳工艺条件为:荔枝壳活性炭用量0. 05 g、铅初始浓度为120 mg/L、p H=5、吸附时间45 min、吸附温度298 K,在此工艺条件下,改性龙眼壳活性炭对Pb(Ⅱ)的吸附量可达229. 72 mg/g.该吸附过程符合准二级吸附动力学模型,其热力学参数△G <0、△H> 0、△S> 0,说明该吸附是自发的吸热吸附过程.The adsorbents（LCSF）longan shell activated carbon with formaldehyde/sulfuric acid as modifier was carried out and the adsorption of Pb（Ⅱ）was studied. The effects of lead concentration, pH value, adsorbing time and temperature on Pb（Ⅱ）adsorbing capacity were studied. The results showed that the LCSF made the Pb（Ⅱ）absorbing capacity improved and the optimum conditions were as follows： LCSF dosage was 0.05 g, lead concentration was 120 mg/L, pH = 5, the adsorbing time was 45 min and the adsorbing temperature was 298 K. Under this condition, the adsorbing capacity of LCSF to lead could reach 229.72mg/g. The second order kinetic model was more suitable for the adsorbing kinetic process. The thermodynamic parameters was △G〈0、△H〉0、△S〉0, indicating that the adsorption was spontaneous and endothermic.

关 键 词：龙眼壳 Pb(Ⅱ) 吸附 动力学 热力学 

分 类 号：TQ91[化学工程] X712[环境科学与工程—环境工程]