VMT/P(AMPS-co-AA)复合高吸水树脂的性能测试

Performance testing of VMT/P(AMPS-co-AA) superabsorbent composite

摘要:

研究了溶液pH、盐浓度对辉光放电电解等离子体引发合成的蛭石/聚(2-丙烯酰胺-2-甲基丙磺酸-co-丙烯酸) (VMT/P(AMPS-co-AA)) 复合高吸水树脂的溶胀行为的影响，考察了染料pH、吸附时间、染料浓度等因素对复合高吸水树脂吸附量的影响，同时对树脂的吸附-解吸性能进行了研究。结果表明, VMT/P(AMPS-co-AA)具有高吸水性、pH敏感性、盐敏感性以及高吸附性。该树脂在蒸馏水中的最大溶胀率达到822.4 g/g，对阳离子染料亚甲基蓝(MB)、结晶紫(CV)和孔雀石绿(MG)的吸附量分别可达2027.8, 2171.8和883.2 mg/g。在pH=6.5和25℃下，其对染料的吸附行为符合动力学准二级模型，该树脂还具有一定的吸附-解吸性能和重复利用性能。

Abstract:

The effect of pH and salts concentration on the equilibrium swelling of the vermiculite/poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-acrylic acid) (VMT/P(AMPS-co-AA)) superabsorbent composite prepared by glow discharge electrolysis plasma (GDEP) were studied systematically. Factors influencing the adsorption of superabsorbent composite for cationic dyes such as pH, adsorption time, dye concentration were investigated in detail by batch experiments. Adsorption-desorption properties of materials were studied as well. The results showed that the superabsorbent composite has pH sensitivity, salt sensitivity, high water absorbency and adsorption capacity. The maximum equilibrium swelling ratio of the superabsorbent composite in distilled water is 822.4 g/g. The maximum adsorption capacities of the superabsorbent composite for Methylene blue (MB), Crystal violet (CV) and Malachite green (MG) are 2027.8, 2171.8 and 883.2 mg/g, respectively. The adsorption process of dyes follows the pseudo-second-order kinetic model with multi-step diffusion process at pH=6.5 and 25. In addition, VMT/P(AMPS-co-AM) hydrogel has certain adsorption-desorption performance, and can be also regenerated and reused.