(麗水師范專科學(xué)校 化學(xué)系，麗水 323000)
摘 要: 研究了Pb2+在氨基膦酸樹(shù)脂上的吸附行為，結(jié)果表明：樹(shù)脂的靜態(tài)飽和吸附容量為822mg/g；用0.5mol/L的HCl和0.2～0.3mol/L的EDTA洗脫，洗脫率分別為97%和99%以上。測(cè)得吸附熱力學(xué)參數(shù)分別為：ΔH=9.04kJ/mol，ΔG=-3.99kJ/mol，ΔS=43.7J/(mol·K)。等溫吸附服從Freundlich經(jīng)驗(yàn)式；表觀活化能Ea=13.8kJ/mol；表觀速率常數(shù)k298=2.28×10-5s-1；樹(shù)脂功能基與Pb2+的配位比為2∶3。用化學(xué)和紅外光譜的方法探討了樹(shù)脂對(duì)Pb2+的吸附機(jī)理。
關(guān)鍵字: 鉛；吸附行為；吸附機(jī)理；氨基膦酸樹(shù)脂
aminomethylene phosphonic
acidresin for Pb2+
WANG Gui-xian
（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)
