Modification of alginate by grafting of N-vinyl-2-pyrrolidone and studies of physicochemical properties in terms of swelling capacity, metal-ion uptake and flocculation
Modification of alginate by grafting of N-vinyl-2-pyrrolidone and studies of physicochemical properties in terms of swelling capacity, metal-ion uptake and flocculation
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DOI：
10.1016/j.carbpol.2010.01.036
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发表时间：
2010-05
影响因子：
11.2
通讯作者：
A. Sand;M. Yadav;D. Mishra;K. Behari
中科院分区：
文献类型：
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作者：
A. Sand;M. Yadav;D. Mishra;K. Behari
通过改变N-乙烯基-2-吡咯烷酮、氢离子、过氧单硫酸钾、羟基乙酸、海藻酸钠的浓度、反应时间和反应温度，确定了以过氧单硫酸钾/羟基乙酸氧化还原引发剂引发海藻酸钠接枝N-乙烯基-2-吡咯烷酮的最佳反应条件。实验结果表明，当海藻酸钠浓度为0.1gdm-3，N-乙烯基吡咯烷酮浓度为16×10 - 2 moldm-3时，接枝率最高。已经观察到，当氢离子的浓度为5.0×10− 3 moldm − 3、乙醇酸的浓度为2.8×10− 3 moldm − 3、过一硫酸钾的浓度为12×10− 3 moldm − 3和温度为40°C时，接枝率、添加量、转化率和效率增加。还研究了溶胀、金属离子吸收和絮凝方面的物理化学现象，并且发现接枝共聚物比纯海藻酸盐在这些性质上显示出增强。接枝和未接枝的样品已经通过FTIR光谱和热重分析表征。
The optimum conditions for grafting of N-vinyl-2-pyrrolidone onto alginate initiated by potassium peroxymonosulphate/glycolic acid redox initiator have been determined by varying the concentration of N-vinyl-2-pyrrolidone, hydrogen ion, potassium peroxymonosulphate, glycolic acid, alginate along with time and temperature. Experimental results show that maximum grafting has been obtained at 0.1gdm−3concentration of alginate and 16×10−2moldm−3concentration of N-vinyl-2-pyrrolidone. It has been observed that grafting ratio, add on, conversion and efficiency increase up to 5.0×10−3moldm−3of hydrogen ion, 2.8×10−3moldm−3of glycolic acid, 12×10−3moldm−3of potassium peroxymonosulphate and 40°C of temperature. A physicochemical phenomenon in terms of swelling, metal-ion uptake and flocculation has also been studied and it has been found that graft copolymer shows enhancement in these properties than pure alginate. Both, grafted and ungrafted samples have been characterized by FTIR-Spectroscopy and thermogravimetric analysis.