大环杯[4]萘对水溶液中 Pb2+的吸附去除：动力学、热力学和等温线分析。
Adsorptive removal of Pb2+ form aqueous solution by macrocyclic calix[4]naphthalene: kinetic, thermodynamic, and isotherm analysis.
机构信息
Environmental Research Laboratory, Department of Applied Chemistry, Aligarh Muslim University, Aligarh 202002, India.
出版信息
Environ Sci Pollut Res Int. 2013 Jan;20(1):219-26. doi: 10.1007/s11356-012-0838-8. Epub 2012 Mar 13.
BACKGROUND
The adsorption characteristics of Pb(2+) ions from aqueous solutions onto calix[4]naphthalene have been investigated.
METHOD
Calix[4]naphthalene was prepared by the condensation of 1-naphthol and formaldehyde (1:2) in presence of hydrochloric acid at 80 °C. The effect of various operation parameters, such as solution pH, initial metal ion concentration, contact time, and temperature, on the adsorption capacity of calix[4]naphthalene for Pb(2+) have been investigated.
RESULT
Experimental results showed that the adsorption of Pb(2+) ions increased with the increase in solution pH and temperature. Langmuir and Freundlich isotherms models were used to describe the adsorption behavior of Pb(2+) by calix[4]naphthalene. Equilibrium data fitted well with the Langmuir isotherm model and the maximum adsorption capacity of calix[4]naphthalene for Pb(2+) at 30 °C was found to be 29.15 mg g(-1). Kinetic studies indicated that the adsorption followed pseudo-second order model and the thermodynamic studies revealed that the adsorption process was spontaneous and endothermic in nature. The obtained results demonstrated that calix[4]naphthalene can be used as an effective adsorbent for Pb(2+) ions removal from water.
背景
研究了从水溶液中吸附 Pb(2+)离子到杯[4]萘中的吸附特性。
方法
在 80°C 下，用盐酸将 1-萘酚和甲醛（1:2）缩合制备杯[4]萘。考察了溶液 pH 值、初始金属离子浓度、接触时间和温度等各种操作参数对杯[4]萘吸附 Pb(2+)的吸附容量的影响。
结果
实验结果表明，Pb(2+)离子的吸附随溶液 pH 值和温度的升高而增加。Langmuir 和 Freundlich 等温线模型用于描述 Pb(2+)被杯[4]萘吸附的行为。平衡数据很好地符合 Langmuir 等温线模型，在 30°C 下杯[4]萘对 Pb(2+)的最大吸附容量为 29.15mg g(-1)。动力学研究表明吸附过程遵循拟二级动力学模型，热力学研究表明吸附过程是自发的、吸热的。结果表明，杯[4]萘可用作从水中去除 Pb(2+)离子的有效吸附剂。
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