物理化学学报 >> 2007, Vol. 23 >> Issue (10): 1572-1576.doi: 10.3866/PKU.WHXB20071015

研究论文 上一篇    下一篇

疏水改性MCM-41对甲草胺缓释性能的影响

彭林; 喻宁亚; 唐群力; 邱化玉; 尹笃林; 银董红   

  1. 湖南师范大学精细催化与合成研究所, 长沙 410081; 湖南大学材料科学与工程学院, 长沙 410082; 杭州师范学院有机硅化学及材料技术教育部重点实验室, 杭州 310012
  • 收稿日期:2007-04-23 修回日期:2007-06-14 发布日期:2007-10-01
  • 通讯作者: 喻宁亚;银董红 E-mail:yindh@hunnu.edu.cn (D.Yin); yuningya@yahoo.com.cn (N.Yu)

Effect of Hydrophobic Modification on Sustained-Release Properties of Alachlor/MCM-41

PENG Lin; YU Ning-Ya; TANG Qun-Li; QIU Hua-Yu; YIN Du-Lin; YIN Dong-Hong   

  1. Institute of Fine Catalysis and Synthesis, Hunan Normal University, Changsha 410081, P. R. China; College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China; Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Teachers College, Hangzhou 310012, P. R. China
  • Received:2007-04-23 Revised:2007-06-14 Published:2007-10-01
  • Contact: YU Ning-Ya;YIN Dong-Hong E-mail:yindh@hunnu.edu.cn (D.Yin); yuningya@yahoo.com.cn (N.Yu)

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摘要： 采用浸渍法将甲草胺吸附到纯硅MCM-41(M41)介孔材料中, 以六甲基二硅氮烷(HMDS)为表面改性剂, 通过气-固反应对吸附了甲草胺的M41材料(Ach/M41)进行疏水改性, 得到了既具有高载药性又能有效延缓甲草胺释放的缓释体系Ach/TMS-M41. XRD、低温N2吸附/脱附、FT-IR和TG等分析结果表明, 甲草胺在M41中的吸附量高达0.381 g·g-1(质量分数为27.6%), 此时M41仍保持原有的孔道结构, 且甲草胺能完全分散于M41孔道中. 分别对Ach/M41和Ach/TMS-M41在水中的缓释性能进行了测试, 甲草胺释放率分别为62%和38.1%, 表明疏水改性对延缓甲草胺释放有较好的效果. 而且, 介孔材料孔壁对甲草胺具有明显的紫外屏蔽保护作用.

关键词: MCM-41, 疏水改性, 甲草胺, 除草剂, 缓释

Abstract: The herbicide of alachlor was incorporated into the channels of MCM-41-type mesoporous silica (M41) by using an impregnation method. Surface hydrophobic modification of the assembly of alachlor-MCM-41 (Ach/M41), via a gas-solid reaction with 1,1,1,3,3,3-hexamethyldisilazane (HMDS), gave rise to an efficient sustained-release system (Ach/TMS-M41). The resulting Ach/TMS-M41 not only retained high alachlor loading capacity but also possessed prolonged alachlor release time. The characterization results of XRD, nitrogen adsorption/desorption, FT-IR, and TG analysis showed that the M41 retained its structural integrity during the alachlor-loading process and alachlor was dispersed completely in the channels of MCM-41 with a mass ratio of alachlor [m (alachlor)/m(alachlor-MCM-41)] as high as 0.381 g·g-1 (mass fraction 27.6%). The release properties of Ach/M41 and Ach/TMS-M41 in water were investigated. 62% and 38.1% of alachlor were released from Ach/M41 and Ach/TMS-M41 ofter 6 days, respectively, which indicated that hydrophobic modification of MCM-41 was conducive to sustained-release of alachlor. Furthermore, the framework of the mesoporous silica protected the encapsulated alachlor against ultraviolet light irradiation.

Key words: MCM-41, Hydrophobic modification, Alachlor, Herbicide, Sustained release

MSC2000: 

  • O647