Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 64, Issue 43, Pages 8095-8102Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b03262
Keywords
copper(II) Schiff base; MCM-41; pH sensitive; sustained release
Funding
- National Natural Science Foundation of China [21576303]
- Natural Science Foundation of Guangdong Province [2016A030313375]
- Science and Technology Planning Project of Guangdong Province, China [2014A020208126, 2015A020209197]
- Science and Technology Program of Guangzhou, China [201510010150]
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The salicylaldehyde-modified mesoporous silica (SA-MCM-41) was prepared through a co-condensation method. Through the bridge effect from the copper ion, which also acts as the nutrition of the plant, the model drug chlorpyrifos (CH) was supported on the copper(II) Schiff base mesoporous silica (Cu-MCM-41) to form a highly efficient sustained-release system (CH-Cu-MCM-41) for pesticide delivery. The experimental results showed that the larger the concentration of the copper ion, the more adsorption capacity (AC) of Cu-MCM-41 for chlorpyrifos and the smaller its release rate. The results confirmed the existence of a coordination bond between SA MCM-41 and copper ions as well as a coordination bond between Cu-MCM-41 and chlorpyrifos. The AC of SA MCM-41 is 106 mg/g, while that of Cu-MCM-41 is 295 mg/g. The as synthesized system showed significant pH sensitivity. Under the condition of pH <= 7, the release rate of chlorpyrifos decreased with increasing pH, whereas its release rate in weak base conditions was slightly larger than that in weak acid conditions. Meanwhile, the drug release rate of the as-synthesized system was also affected by the temperature. Their sustained-release curves can be described by the Korsmeyer-Peppas equation.
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