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Developing effective sustained release system is an efficient way to prevent the pollution from overused pesticide. Hence, a highly efficient sustained release system was developed using zinc (II) modified montmorillonite (Zn-Mt) prepared by ion exchange from sodium montmorillonite (Na-Mt) with zinc nitrate. Zn-Mt was modified by sodium alginate (ALG) to further improve its sustained release performance and pH-sensitivity. The results indicated that triazolone was supported on the zinc modified montmorillonite through the coordination bond from zinc ion. The zinc ion in the Mt also played a similar role as calcium ion to induce ALG crosslinking which made ALG highly dispersed in the pores of Mt. ALG interacted with Zn 2+ from Mt through electrostatic interaction and winded with triazolone to form a barrier for the sustained release system. As a result, the adsorption capacity of ALG-Zn-Mt (17.75 mg/g) was improved comparing with Na-Mt without modification (14.52 mg/g). The sustained release performance of ALG-Zn-Mt showed also significant pH-sensitivity in accordance with the stability of ALG.

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