大孔吸附树脂对木质素磺酸钠的吸附行为

Adsorption of Sodium Lignosulphonate by Macroporous Resin

考察了3种不同极性的大孔树脂NKA-9、AB-8、H103对木质素磺酸钠的吸附能力,发现极性树脂NKA-9的吸附量大于弱极性和非极性树脂。进一步以NKA-9极性树脂对木质素磺酸钠进行静态吸附和脱附实验,结果表明,低温和酸性条件下有利于吸附,吸附量随着木质素磺酸钠质量浓度的增大而增大,且吸附在180min后达平衡。脱附实验结果表明,甲醇溶液更有利于木质素磺酸钠的洗脱。对脱附样品进行相对分子质量(简称分子量,下同)和官能团分析发现,高酚羟基含量,低羧酸基和低磺酸基含量的木质素磺酸钠分子更容易被极性树脂NKA-9所吸附。

The adsorption properties of 3 types of macroporous resins, NKA - 9, AB - 8, and H103, with different polarity for sodium lignosulphonate were evaluated. Macroporous resin NKA - 9 with strong polarity displayed the best adsorption capacity among the tested resins. The static adsorption and desorption characteristics of NKA -9 for sodium lignosulphonate were investigated. The results show that the decrease of temperature and pH was favorable for adsorption. With the mass concentration increasing, the static adsorption capability of sodium lignosulphonate by NKA -9 resin increased. The adsorption reached equilibrium after 180 minutes. The desorption effect of methanol was the best. By analyzing sodium lignosulphonate washed out from the resin, it is shown that the sodium lignosulphonate with higher content of phenolic hydroxyl group and lower content of carboxyl and sulfonic group is easier to be adsorbed.