预辐照接枝丙烯酸与丙烯酰胺改性苎麻纤维及其吸附铜离子性能研究

Study on Pre-irradiation Grafting Acrylic Acid and Acrylamide Onto Ramie Fiber and Its Adsorption Performance for Copper Ions

将丙烯酸(AA)与丙烯酰胺(AM)通过预辐照接枝在苎麻纤维上,通过协同作用提高其接枝率,并研究了其对Cu2+的吸附性能。傅里叶红外光谱(FT-IR)对苎麻纤维表面分析结果显示,AA及AM成功接枝在苎麻纤维上,吸收剂量为35kGy时,接枝率可达151%(AA与AM浓度比为1∶1)。对Cu2+的吸附实验结果表明,接枝后的苎麻纤维在吸附反应初期,Cu2+吸附量迅速增加,20~30min增加速度变缓,30min后趋于饱和;随着温度升高,吸附量迅速增加,但温度高于40℃后,吸附量不再增加;吸附量随初始Cu2+浓度的增加而增大,在初始浓度为1 000mg/L的Cu2+溶液中,苎麻纤维的Cu2+吸附量可达14.40mg/g。

Acrylic acid(AA)and acrylamide(AM)were synergistically grafted onto ramie fiber by pre-irradiation for improving grafting rate.Adsorption performance of the grafted ramie fiber for copper ions was studied.The results with Fourier infrared spectroscopy(FT-IR)surface analysis show that AA and AM are successfully grafted onto ramie fiber.The grafting rate attains 151%under the absorbed dose of 35 kGy with AA and AM concentration ratio 1∶1.And the results with adsorption condition experimentanalysis show that at beginning of the adsorption reaction,the copper ions adsorption capacity of grafted ramie fiber increases rapidly,between 20 and 30min decreases,after30 min the adsorption reaction tends to saturation.Adsorption capacity increases rapidly with temperature,but when the temperature is higher than 40℃,the adsorption capacity no longer increases.The adsorption capacity increases with the initial concentration of CuSO4.In the solution of the initial concentration of 1 000mg/L of CuSO4,the copper ions adsorption capacity of the grafted ramie fiber reaches 14.40mg/g.