Adsorption and desorption of phosphate and nitrate ions using quaternary (polypropylene-g-N,N-dimethylamino ethylmethacrylate) graft copolymer
Adsorption and desorption of phosphate and nitrate ions using quaternary (polypropylene-g-N,N-dimethylamino ethylmethacrylate) graft copolymer
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DOI：
10.1016/j.jhazmat.2008.02.028
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发表时间：
2008-11-30
影响因子：
13.6
通讯作者：
Hegazy, El-Sayed A.
中科院分区：
文献类型：
--
作者：
Abou Taleb, Manal F.;Mahmoud, Ghada A.;Hegazy, El-Sayed A.
研究了用γ射线辐照法在聚丙烯（PP）膜上接枝甲基丙烯酸N，N（二甲氨基乙基）酯（DMAEMA）制备功能化共聚物。研究了单体浓度和辐照剂量对接枝率的影响。结果表明，接枝率随单体浓度和辐照剂量的增加而增加。随后使用不同的试剂，1-溴十八烷，碘甲烷和苄基氯，PDMAEMA接枝链的胺基的季铵化，以改善其离子特性进行。用红外光谱、力学性能和热性能对接枝PP膜进行了表征。考察了吸附过程中磷酸根（PO 43-）和硝酸根（NO3-）离子的吸附速率、pH效应、脱附率和初始进料浓度效应。结果表明，在10 h以内，随着吸附时间的延长，PO 43-和NO3-的吸附量增加，随着介质pH值的升高，吸附量减少。脱附率为18 - 30%，从官能化接枝共聚物中脱附PO 43-和NO3-离子相对困难。结果表明，这种功能化接枝膜在去除介质中的某些阴离子如PO 43-和NO3-方面具有良好的可能性。(C)2008 Elsevier B. V.保留所有权利。
Study has been made on the preparation of functionalized copolymer by grafting N,N(dimethylaminoethyl) methacrylate (DMAEMA) onto polypropylene (PP) films using gamma-irradiation technique. The effect of monomer concentration and irradiation dose on the grafting yield was studied. It was found that grafting yield increases with increasing the monomer concentration and irradiation dose. Subsequent quaternization of the amine group of PDMAEMA graft chain using different reagents, 1-bromo octadecane, methyl iodide and benzyl chloride, to improve their ionic character was carried out. The grafted PP films were characterized by IR spectroscopy, and mechanical and thermal properties. During the adsorption of phosphate (PO43-) and nitrate (NO3-) ions, the rate of adsorption, pH effect, desorbability and initial feed concentration effect were investigated. It was found that the adsorption Of PO43- and NO3- ions increases with increasing the adsorption time up to 10h and decreases with increasing the pH of medium. The desorbability is ranging from 18 to 30%, and it is relatively difficult to desorb PO43- and NO3- ions from the functionalized grafted copolymers. Results showed good possibility for the use of such functionalized grafted film in the field of removal of some anions such as PO43- and NO3- from their media. (C) 2008 Elsevier B.V. All rights reserved.