(南京理工大學(xué) 化工學(xué)院，南京 210094)
摘 要: 通過靜態(tài)吸附實驗，研究了Pb2+在001×7強(qiáng)酸性陽離子交換樹脂上的吸附行為，并從熱力學(xué)和動力學(xué)方面對吸附過程進(jìn)行了分析，用紅外光譜的方法探討了001×7樹脂吸附Pb2+的機(jī)理。結(jié)果表明：在所研究的濃度范圍內(nèi)，Pb2+在001×7樹脂上的吸附平衡數(shù)據(jù)符合Freundlich等溫吸附方程，吸附為自發(fā)進(jìn)行的放熱過程；液膜擴(kuò)散為Pb2+在001×7樹脂上吸附速率的主要控制步驟，隨著振蕩頻率的增加，吸附速率會逐漸增大；最佳的吸附pH在4左右，用3 mol/L的硝酸對飽和樹脂進(jìn)行洗脫再生，洗脫率可達(dá)98%以上；298 K溫度下樹脂的靜態(tài)飽和吸附容量為414 mg/g(濕樹脂)。
關(guān)鍵字: 鉛；強(qiáng)酸性陽離子交換樹脂；吸附；熱力學(xué)；動力學(xué)；機(jī)理
（School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract:The adsorption behavior of Pb2+ on 001×7 strong-acid cation exchange resin was studied with the static method and the adsorption process was analyzed from thermodynamics and kinetics aspect. The adsorption mechanism of Pb2+ on 001×7 resin was discussed by IR spectra. The experimental results show that, in the studied concentration range, the equilibrium adsorption data fit to Freundlich isotherms. Adsorption is an exothermic process running spontaneously. Kinetic analysis show that the adsorption rate is mainly governed by liquid film diffusion and with the increment of surge frequency, the adsorption rate will increase. The pH value of best adsorption condition is 4. Saturated resin can be regenerated by 3 mol/L nitric acid, the elution percentage is over 98%. The maximal static saturated adsorption capacity is 414 mg/g (wet resin) in 298 K.
Key words: lead; strong-acid cation exchange resin; adsorption; thermodynamics; kinetics; mechanism
