Synthesis, characterization and flocculation activity of novel Fe(OH)3–polyacrylamide hybrid polymer
Synthesis, characterization and flocculation activity of novel Fe(OH)3–polyacrylamide hybrid polymer
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DOI：
10.1016/j.matchemphys.2011.08.027
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发表时间：
2011-11
影响因子：
4.6
通讯作者：
Huilong Wang;Jin Cui;Wen-Feng Jiang
中科院分区：
文献类型：
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作者：
Huilong Wang;Jin Cui;Wen-Feng Jiang
→采用自由基溶液聚合法制备了新型Fe (OH) 3-PAM杂化高分子絮凝剂。→研究了新型Fe (OH) 3-PAM杂化高分子絮凝剂对高岭土悬浮液的絮凝作用。→首次将统计模型应用于高岭土絮凝过程热力学参数的计算。摘要：在水介质中，采用氧化还原引发体系（(NH4) 2S2O8-NaHSO3）自由基溶液聚合法制备了新型Fe (OH) 3-聚丙烯酰胺无机-有机杂化聚合物（FHPAM）。考察并优化了引发剂浓度、单体质量分数、反应温度和反应时间等对杂化聚合物特性粘度和收率的影响。结果表明，在引发剂浓度为0.3%，丙烯酰胺单体质量分数为20%的条件下，在40℃溶液聚合7 h下，混合絮凝剂的最大特性粘度和产率可达94%。结果表明，在FHPAM中，Fe (OH) 3胶体与聚丙烯酰胺链之间存在化学键。对2.5 g L-1高岭土悬浮液的混凝性能进行了研究，结果表明，该混凝剂具有优异的絮凝性能，其絮凝效果远优于市售聚丙烯酰胺（PAM）和聚合硫酸铁（PFS）。对高岭土悬浮液进行絮凝处理的最佳条件为pH 7.0， FHPAM投加量为40 mg L-1。根据统计模型计算了絮凝过程的热力学参数。对结果进行了解释。
Highlights:→ The preparation of a novel Fe (OH) 3-PAM hybrid polymer flocculant is achieved via free radical solution polymerization.→ Flocculation of kaolin suspensions using this novel Fe (OH) 3-PAM hybrid polymer flocculant is revealed in this study.→ The statistical model was first applied for calculating the thermodynamic parameters for the kaolin flocculating process.-Abstract: A novel Fe (OH) 3-polyacrylamide inorganic-organic hybrid polymer (FHPAM) was synthesized via free radical solution polymerization initiated by a redox initiation system ((NH4) 2S2O8-NaHSO3) in an aqueous medium. Reaction parameters influencing the intrinsic viscosity and the yield of the hybrid polymer, such as initiator concentration, monomer mass fraction, temperature and reaction time were investigated and optimized. The results show that the maximum intrinsic viscosity and up to 94% yields of the hybrid polymer can be achieved using initiator concentration of 0.3% with acrylamide monomer mass fraction of 20% under solution polymerization at 40 deg. C for 7 h. The physicochemical properties of this hybrid flocculant were characterized with TEM, FTIR spectra, TGA, and conductivity. It was found that a chemical bond exists between Fe (OH) 3 colloid and polyacrylamide chains in the FHPAM. The application of the hybrid polymer for the treatment of 2.5 g L-1 kaolin suspension indicates that it had an excellent flocculation capacity and its flocculation efficiency was much better than that of commercial available polyacrylamide (PAM) and polymeric ferric sulfate (PFS). The optimal conditions for the flocculation treatment of kaolin suspension were the FHPAM dosage of 40 mg L-1 at pH 7.0. The thermodynamic parameters for the flocculation process were calculated based on a statistical model. Interpretation of the results was given.