硝酸改性龙眼壳活性炭对Pb(Ⅱ)的吸附性能研究  

Adsorption of Pb(Ⅱ) by Longan Shell Activated Carbon Modified by Nitric Acid

作　　者：黄慧珍[1] 

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：《长江大学学报（自然科学版）》2018年第10期46-49,56,共5页Journal of Yangtze University(Natural Science Edition)

基　　金：福建省中青年教师教育科研项目(JA15686)

摘　　要：以龙眼(Dimocarpus longan Lour.)壳为原料,硝酸为改性剂,制备硝酸改性龙眼壳活性炭(LCN),并吸附水溶液中的Pb(Ⅱ),研究了pH、吸附温度、Pb(Ⅱ)质量浓度、吸附时间对Pb(Ⅱ)吸附量的影响。结果表明,硝酸改性能显著提高龙眼壳活性炭对Pb(Ⅱ)的吸附能力,当溶液pH 5、吸附温度298K、Pb(Ⅱ)质量浓度100mg/L、吸附时间40min时,LCN对Pb(Ⅱ)的吸附量为192.72mg/g。准二级动力学模型更符合LCN对Pb(Ⅱ)的吸附过程。与Freundlich等温吸附方程相比,Langmuir等温吸附方程更符合LCN对Pb(Ⅱ)的吸附行为,说明LCN对Pb(Ⅱ)的吸附是以单分子层吸附为主。Longan(Dimocarpus longan Lour.)shell activated carbon modified by nitric acid(LCN) was prepared by using longan shell as raw material and nitric acid as modifier.The LCN was used to adsorb the Pb(Ⅱ) in aqueous solution.The adsorption effect of pH,adsorption temperature,Pb(Ⅱ)concentration,and adsorption time on Pb(Ⅱ) adsorption capacity were investigated.The results showed that the modification of nitric acid could significantly improve the adsorption ability of the LCN to Pb(Ⅱ).When the pH was 5,Pb(Ⅱ)concentration is100 mg/L,adsorption temperature was 298 Kand adsorption time was 40 min,the Pb(Ⅱ)adsorption capacity of LCN reaches192.72 mg/g.The pseudo second order kinetic model was more suitable for the adsorption process.Langmuir isothermal adsorption equation was more suitable to LCN adsorption Pb(Ⅱ)as compared to Freundlich isothermal adsorption equation,it indicates that the adsorption of Pb(Ⅱ)by LCN was primarily the single molecule layer absorption.

关 键 词：龙眼(DimocarpuslonganLour.)壳 活性炭 Pb(Ⅱ) 吸附 

分 类 号：X712[环境科学与工程—环境工程] TQ91[化学工程]