甲醛/硫酸改性龙眼壳活性炭对Pb^(2+)的吸附性能研究  

Kinetics and thermodynamics for Pb^(2+) absorption by Longan shell activated Carbon modified by Formaldehyde/Sulfuric Acid

作　　者：黄慧珍[1] Huang Huizhen(School of Food Engineering,Zhangzhou Institute of Technology,Zhangzhou 363000,China)

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：《湖南文理学院学报（自然科学版）》2018年第4期22-25,共4页Journal of Hunan University of Arts and Science(Science and Technology)

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,制备了龙眼壳活性炭(LCFS),探讨了在不同的工艺条件下LCFS对Pb^(2+)吸附性能的影响。结果表明:在龙眼壳活性炭用量0.05 g、铅初始浓度为120 mg/L、pH=5、吸附时间45 min、吸附温度298 K条件下, LCFS对Pb^(2+)的吸附量可达229.72 mg/g;准二级吸附动力学模型更符合该吸附过程;热力学参数ΔG <0、ΔH> 0、ΔS> 0,说明该吸附是自发的吸热吸附过程。The LCSF is prepared with formaldehyde/sulfuric acid as modifier and the effects of LCFS on Pb absorption capacity are investigated under different technological conditions. The optimum technological conditions for absorption of Pb2＋ by LCSF are listed as follows： LCSF dosage is 0.05 g, lead concentration is 120 mg/L, pH = 5, the absorption time is 45 min and the adsorption temperature is 298 K. Under this condition, the absorption capacity of LCSF to lead could reach 229.72 mg/g. The second order kinetic model is more suitable for the absorption kinetic process. The thermodynamic parameters is ΔG 〈 0, ΔH 〉 0, ΔS 〉 0, indicating that the absorption is spontaneous and endothermic.

关 键 词：龙眼壳 甲醛/硫酸 PB^2+ 吸附 

分 类 号：TQ91[化学工程] X712[环境科学与工程—环境工程]