(丽水师范专科学校 化学系，丽水 323000)
摘 要: 研究了Pb2+在氨基膦酸树脂上的吸附行为，结果表明：树脂的静态饱和吸附容量为822mg/g；用0.5mol/L的HCl和0.2～0.3mol/L的EDTA洗脱，洗脱率分别为97%和99%以上。测得吸附热力学参数分别为：ΔH=9.04kJ/mol，ΔG=-3.99kJ/mol，ΔS=43.7J/(mol·K)。等温吸附服从Freundlich经验式；表观活化能Ea=13.8kJ/mol；表观速率常数k298=2.28×10-5s-1；树脂功能基与Pb2+的配位比为2∶3。用化学和红外光谱的方法探讨了树脂对Pb2+的吸附机理。
关键字: 铅；吸附行为；吸附机理；氨基膦酸树脂
aminomethylene phosphonic
acidresin for Pb2+
（Department of Chemistry，Lishui Teachers College，Lishui 323000, China）
Abstract:The adsorption behavior of aminomethylene phosphonic acidresin(APAR)for lead(Ⅱ) is investigated. Experimental results show that statically saturated adsorption capacity is 822mg/g. Pb(Ⅱ) adsorbed on APAR can be eluted with 0.5?mol/L HCl and 0.2～0.3mol/L EDTA. The elution percentages are 97 % and over 99%，respectively. The adsorption parameters of thermodynamic are Δ H=9.04kJ/mol，ΔG=-3.99kJ/mol，ΔS=43.7J/mol·K，respectively. The adsorption behavior of APAR for Pb2+ obeys the Freundlich isotherm. The apparent activation energy is Ea=13.8kJ/mol. The apparent adsorption rate constant is k298=2.28×10-5s-1. The coordination molar ratio of the functional group of APAR to Pb(Ⅱ) is 2∶3. The adsorption mechanism of resin for Pb2+ is examined by chemical analysis and IR spectra.
Key words: lead；adsorption behavior；adsorption mechanism；aminomethylene phosphonic acidresin(APAR)
