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％.
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%.
参考文献
| [1] | I.G. Richardson .The calcium silicate hydrates[J].Cement and Concrete Research,2008(2):137-158. |
| [2] | Richardson I G .Tobermorite/jennite-and tobermorite/cal-cium hydroxide-based models for the structure of C-S-H:applicability to hardened pastes of tricalcium silicate,β-dicalcium silicate,Portland cement,and blends of Port-land cement with blast-furnace slag,metakaolin,or silica fume[J].Cement and Concrete Research,2004,34:1733-1777. |
| [3] | Lin Kaili;Chang Jiang;Wang Zheng .Fabrication and the characterisation of bioactivity and degradability of macro-porous calcium silicate bioceramics in vitro[J].Journal of Inorganic Materials,2005,20(3):692-698. |
| [4] | Jeffrey J. Chen;Jeffrey J.Thomas;Hal F.W.Taylor .Solubility and structure of calcium silicate hydrate[J].Cement and Concrete Research,2004(9):1499-1519. |
| [5] | CHEN Xuechu;KONG Hainan;WU Deyi;WANG Xinze;LIN Yongyong .Phosphate removal and recovery through crystallization of hydroxyapatite using xonotlite as seed crystal[J].Journal of environmental sciences,2009(5):575-580. |
| [6] | Thermodynamic modeling of ferric phosphate precipitation for phosphorus removal and recovery from wastewater[J].Journal of hazardous materials,2010(1/3):444. |
| [7] | Song Y H;Peter G W;Berg U et al.Calcite-seed crys-tallization of calcium phosphate for phosphorus recovery[J].CHEMOSPHERE,2006,63:236-243. |
| [8] | Renman A;Renman G .Long-term phosphate removal by the calcium-silicate material polonite in wastewater sys-tems[J].CHEMOSPHERE,2010,79:659-664. |
| [9] | Melike Sinirkaya;A. Kadir Ozer;M. Sahin Gulaboglu .Investigation of the changes of P2O5 content of phosphate rock during simultaneous calcination/sulfation[J].Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems,2011(1):72-76. |
| [10] | Wei Guan;Fangying Ji;Qingkong Chen .Preparation and phosphorus recovery performance of porous calcium-silicate-hydrate[J].CERAMICS INTERNATIONAL,2013(2):1385-1391. |
| [11] | Ali Pourjavadi;Seyed Mahmoud Fakoorpoor;Payam Hosseini.Interactions between superabsorbent polymers and cement-based composites incorporating colloidal silica nanoparticles[J].Cement & concrete composites,2013:196-204. |
| [12] | E. Knapen;D. Van Gemert .Cement hydration and microstructure formation in the presence of water-soluble polymers[J].Cement and Concrete Research,2009(1):6-13. |
| [13] | Urbanetz NA .Stabilization of solid dispersions of nimodipine and polyethylene glycol 2000.[J].European journal of pharmaceutical sciences,2006(1/2):67-76. |
| [14] | Roy, M.;Devoe, K.;Bandyopadhyay, A.;Bose, S. .Mechanical property and in vitro biocompatibility of brushite cement modified by polyethylene glycol[J].Materials science & engineering, C. Biomimetic and supramolecular systems,2012(8):2145-2152. |
| [15] | 关伟,吉芳英,陈晴空,晏鹏,张千.水化硅酸钙的制备及磷回收性能表征[J].功能材料,2012(23):3286-3290. |
| [16] | 张文生,叶家元,王妍萍,王宏霞,王渊,李永鑫.掺杂有机大分子水化硅酸钙的孔结构及表面分形特征[J].硅酸盐学报,2006(12):1497-1502. |
| [17] | Jianyu Guo;Xiangmin Zhang .Metal-ion interactions with sugars.The crystal structure and FTIR study of an SrCl_2-fructose complex[J].Carbohydrate research,2004(8):1421-1426. |
| [18] | 吴文文,张莉,隋坤艳,高耸,吴智明,赵昕,李玉金.碳纳米管接枝聚乙二醇负载ZnO的制备与表征[J].功能材料,2011(10):1742-1745. |
| [19] | James J. Beaudoin;Harouna Drame;Laila Raki;Rouhollah Alizadeh .Formation and properties of C-S-H-PEG nano-structures[J].Materials and structures,2009(7):1003-1014. |
| [20] | 代维,薛屺,代莉,罗腾奘.制备陶瓷块体材料高分子分散剂的选择[J].中国科技信息,2011(08):44-45. |
| [21] | Chen F D;Liu C S;Wei J et al.Preparation and char-acterization of injectable calcium phosphate cement paste modified by polyethylene glycol-6 000[J].Materials Chemistry and Physics,2011,125:818-824. |
| [22] | 田久英,卢菊生,吴宏.添加剂聚乙二醇对堇青石蜂窝陶瓷载体γ-Al_2O_3涂层性能的影响[J].高校化学工程学报,2010(01):167-170. |
| [23] | Celik F A;Kazanc S.Crystallization analysis and deter-mination of Avrami exponents of CuAlNi alloy by mo-lecular dynamics simulation[J].PHYSICA B,2013(409):63-70. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%