Adsorptive removal of Pb2+ form aqueous solution by macrocyclic calix[4]naphthalene: kinetic, thermodynamic, and isotherm analysis

作者：Ahmad Rais; Kumar Rajeev^*; Laskar Mohammad Asaduddin

来源：Environmental Science and Pollution Research, 2013, 20(1): 219-226.

DOI：10.1007/s11356-012-0838-8

• Adsorption
• Calix[4]naphthalene
• Isotherms
• Kinetic
• Thermodynamic

The adsorption characteristics of Pb2+ ions from aqueous solutions onto calix[4]naphthalene have been investigated.
Calix[4]naphthalene was prepared by the condensation of 1-naphthol and formaldehyde (1:2) in presence of hydrochloric acid at 80A degrees 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 Pb2+ have been investigated.
Experimental results showed that the adsorption of Pb2+ ions increased with the increase in solution pH and temperature. Langmuir and Freundlich isotherms models were used to describe the adsorption behavior of Pb2+ by calix[4]naphthalene. Equilibrium data fitted well with the Langmuir isotherm model and the maximum adsorption capacity of calix[4]naphthalene for Pb2+ at 30A degrees 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 Pb2+ ions removal from water.

• 出版日期2013-1