聚乙二醇改性对水化硅酸钙的微观结构及溶解性能的影响

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关伟
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1重庆大学 三峡库区生态环境教育部重点实验室,重庆 400045


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为了增强水化硅酸钙的溶解性能,以聚乙二醇(PEG)作为造孔剂,对水化硅酸钙进行改性.重点关注聚乙二醇的分子量对水化硅酸钙的微观结构及溶解性能的影响.研究发现,PEG 分子插入了水化硅酸钙的硅氧四面体链的缺陷部位或者进入层间,阻止了水化硅酸钙颗粒间的范德华力的缔合.PEG 经过煅烧过程后留下的空隙使得水化硅酸钙的孔容积和比表面积增大.当 PEG 的分子量为2000时,改性后的水化硅酸钙的比表面积和孔容积均分别为87.48 m2/g与0.33 cm3/g,溶出的 Ca2+浓度达到6.75 mg/L,回收磷后沉积物中的磷含量可达到19.05%.

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DOI: http://dx.doi.org/10.3969/j.issn.1001-9731.2014.01.020

语种: 中文   

基金国家水体污染控制与治理重大科技专项资助项目(2009ZX07315)

关键词水化硅酸钙 聚乙二醇 溶解 改性 孔隙结构


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