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就氨基膦酸树脂对镉的吸咐行为进行了研究.实验结果表明,在pH=4.6时,树脂对镉的静态饱和吸咐容量为w(Cd(Ⅱ)/树脂)=247.4mg/g,表观吸咐速率常数k298=2.38×10-4s-1,且用2mol/L盐酸可以定量洗脱;测得吸咐热力学参数分别为:ΔH=3.481kJ·mol-1,ΔG=-3.17kJ·mol-1,ΔS=22.70J·mol-1·K-1,等温吸咐服从Frenndlich曲线.运用吸咐前、后的红外光谱图对照分析了树脂与镉的成键情况.
The adsorption behavior of amino phosphonic acid resin on cadmium was studied.The experimental results showed that the static adsorption capacity of Cd (Ⅱ) / Cd (Ⅱ) was 247.4mg / g at pH = 4.6, The apparent adsorption rate constant k298 = 2.38 × 10-4s-1, and quantitatively eluted with 2mol / L hydrochloric acid. The measured thermodynamic parameters were as follows: ΔH = 3.481kJ · mol-1, ΔG = -3.17kJ · Mol-1, ΔS = 22.70J · mol-1 · K-1, the isothermal adsorption obeys the Frenndlich curve, and the bonding between the resin and cadmium was analyzed by using infrared spectra before and after adsorption.