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Citation: PENG Lin, YU Ning-Ya, TANG Qun-Li, QIU Hua-Yu, YIN Du-Lin, YIN Dong-Hong. Effect of Hydrophobic Modification on Sustained-Release Properties of Alachlor/MCM-41[J]. Acta Physico-Chimica Sinica, ;2007, 23(10): 1572-1576. doi: 10.3866/PKU.WHXB20071015 shu

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

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 Date: 23 April 2007
Available Online: 1 August 2007

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.
- MCM-41; Hydrophobic modification; Alachlor; Herbicide; Sustained release
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