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  

Effect of microstructure and solubility of calcium silicate hydrate modified by polyethyleneglycol

作　　者：吉芳英[1] 关伟[1] 裴琳[1] 刘亭役[1] 方卓尧 李彦龙[1] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《功能材料》2014年第1期89-94,共6页Journal of Functional Materials

基　　金：国家水体污染控制与治理重大科技专项资助项目(2009ZX07315);重庆市重大科技专项资助项目(2008AB7133)

摘　　要：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2 000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%。In order to enhance the solubility of calcium silicate hydrate （CSH）,this material was modified by polyethyleneglycol （PEG）as pore-generation agent.This study focuses on the effect of molecular weight of PEG on the microstructure and solubility of CSH.The research shows that PEG molecules insert the defect region of oxygen-silicon tetrahedron chain or the layers of CSH.This progress prevents the association of Van Der Waals force among the CSH particles.The residual space caused by the incineration of PEG increased the pore volume and specific surface area of CSH.The pore volume and specific surface area of CSH modified by PEG with mo-lecular weight 2 000 was 87.48 m2/g and 0.33 cm3/g,respectively.And the concentration of Ca2 ＋ was 6.75 mg/L.The phosphorus content of sediment after phosphorus recovery could reach 1 9.05%.

关 键 词：水化硅酸钙 聚乙二醇 溶解 改性 孔隙结构 

分 类 号：X5[环境科学与工程—环境工程] TB3[一般工业技术—材料科学与工程]