纳米纤维素晶须双重接枝共聚物对Cu^(2+)的吸附

Nanocellulose whiskers' dual grafting with acrylic acid and acrylamide for Cu^(2+) adsorption

将丙烯酸和丙烯酰胺接枝到纳米纤维素晶须表面,制备出双重接枝共聚物。通过红外光谱和偏光显微镜分析表征双重接枝共聚物的官能团和液晶性能,研究了其对Cu2+的吸附性能,考察了吸附时间、吸附温度、pH值和初始浓度对吸附性能的影响。实验结果表明,丙烯酸和丙烯酰胺成功接枝到纳米纤维素晶须的表面;Cu2+的加入影响了双重接枝共聚物的液晶织构;在吸附时间为8h,吸附温度为35℃,pH值为6~8时,双重接枝共聚物对Cu2+具有最佳的吸附效果,最大的吸附容量为38.96mmol/g,吸附过程符合Langmuir方程。

Acrylic acid （AA） and acrylamide （AM） were simultaneously grafted onto the surface of nanocellu lose whiskers （N（W）. The AA, AMg NCW was analyzed by infrared spectroscopy （FT IR） and polarizing op tical microscopy 〈POM）. The effects of the adsorption time, adsorption temperature, pH values and initial concentration on its Cu2＋ adsorption properties were studied. The results showed that AA and AM were suc cessfully grafted onto the NCW. The added Cu2＋ ions influenced the liquid crystalline texture of AA, AM g NCW. AA, AM-g-NCW had best adsorption effect for Cu2＋ when the adsorption time was8 h, the adsorption temperature was 35 ℃ and the pH walue was 6 8. The maximum adsorption capacity was 38.96 mmol/g for the Cu2＋ ions. The adsorption isotherm could be well fitted in with Langmuir equation.