Preparation of Polypropylene Chelating Fibers by Quenching Pretreatment and Suspension Grafting and Their Pb2+ Adsorption Ability

作者：Zhou Qing; Li Mengxing; Yao Xiaohong; Lian Zhouyang; Zhang Chao; Wei Wuji^*; Huang Jian

来源：Fibers and Polymers, 2014, 15(11): 2238-2246.

DOI：10.1007/s12221-014-2238-9

• Polypropylene
• Melt-blown fiber
• Quenching pretreatment
• Suspension grafting
• Acrylic acid
• Diethylenetriamine
• Chelating adsorption

To prepare polypropylene (PP) melt-blown fibers with Pb2+ adsorption ability in water, high-crystalline PP was first pretreated by quenching and then grafted with acrylic acid (AA) by the suspension-grafting method to prepare PP grafted with AA (PP-g-AA). Finally, the chelating fiber, PP-g-AA-DETA, was prepared by the amidation of PP-g-AA fiber, obtained by melt-blown spinning, with diethylenetriamine (DETA). In the quenching pretreatment, the effects of solvent amount on the crystallinity and specific surface area of PP were investigated. The main factors of suspension grafting affecting the PP-g-AA graft rate were investigated, and the melt flow rate (MFR) and water contact angle (WCA) of PP-g-AA were measured. The maximum Pb2+ adsorption ability of the chelating fiber was determined. The results indicate that the quenching pretreatment increased the size of PP amorphous area and formed pores on the particle surface. The specific surface area of PP and its crystallinity increased simultaneously with increasing solvent amount. The gait rate of PP-g-AA first increased with increasing solvent amount and then deceased. The MFR decreased rapidly after the graft rate reached 13 %, and the WCA dropped from 102 to 50. The adsorption behavior of the chelating fiber matched the Langmuir adsorption isotherm model and showed good selective Pb2+ adsorption ability with Mg2+ as competing ion. The maximum adsorption capacities of PP-g-AA and PP-g-AA-DETA fiber calculated by the Langmuir equation were 12.2 and 25.7 mg/g respectively.

• 出版日期2014-11