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以聚丙烯酸钠(PAAS)为络合剂,研究钯(II)的络合-超滤行为.考察聚合物/金属质量比(rp/m)、pH、膜两侧压差(Δp)对膜通量(J)和钯截留系数(RPd)的影响,发现J不随rp/m变化,随pH增大而增大,随Δp增大呈线性递增;RPd随rp/m或pH增大而增大,与Δp无关.控制rp/m=2和pH=6,PAAS-钯(II)溶液的浓缩结果表明,随体积浓缩因子增大,J略有下降,RPd接近1,截留液钯浓度(Cr)线性递增,渗透液钯浓度(Cp)约0.07mg/L.以浓缩液为研究对象,在pH=3下考察PAAS-钯(II)的解络合行为,随时间延长,Cr不变,Cp逐渐增至100.9mg/L,解络合平衡时间为13min,解络合率为56.3%.对解络合液洗涤超滤,当洗涤液体积为原料液体积的3.5倍时,Cr从179.3降至5.2mg/L,钯洗脱率为97.1%.
The complexation-ultrafiltration behavior of palladium (II) was investigated by using sodium polyacrylate (PAAS) as the complexing agent.The effects of polymer / metal ratio (rp / m), pH, pressure drop Flux (J) and palladium retention coefficient (RPd). It was found that J did not change with rp / m, but increased with increasing pH and increased linearly with increasing Δp. RPd increased with rp / m or pH The results of concentration of PAAS-Pd (II) solution showed that with the increase of volume concentration factor, J decreased slightly, RPd was close to 1, the concentration of palladium in retentate ( Cr) increased linearly with a permeate concentration of about 0.07 mg / L. The concentration of PAAS-Pd (II) was investigated at pH = 3 with prolonged Cr , Cp gradually increased to 100.9mg / L, the equilibrium time of the complexation was 13min, the rate of disentanglement was 56.3% .When the volume of washing solution was 3.5 times of the volume of raw material, 179.3 to 5.2 mg / L, palladium elution rate of 97.1%.