Department of Chemistry, Changwon National University, Changwon, 51140, Republic of Korea.
HoChiMinh City Institute of Resources Geography-VAST, 01 Mac Dinh Chi, Dist.1, Ho Chi Minh City, Vietnam.
Environ Sci Pollut Res Int. 2017 Aug;24(23):19386-19392. doi: 10.1007/s11356-017-9580-6. Epub 2017 Jul 4.
The herbicide glyphosate (GLY) or 2,4-dichlorophenoxyacetic acids (2,4D) was intercalated in the interlayer region of a Zn-Al-layered double hydroxide (LDH) to obtain LDH-GLY or the LDH-2,4D hybrid composite because of its controlled release. Compared to the physically mixed herbicides, the LDH-herbicide hybrid composite displayed slow-release properties in decarbonated distilled water. The release rate of herbicides was found to be dependent on the carbonate and chloride anion concentrations in solution. The time at which 50% of the herbicides were released from the hybrid composite into solution, t , ranged from 6.5 to 18.6 h for LDH-GLY and from 10 to 21.5 h for LDH-2,4D. Our results indicate that the application of LDH-GLY or LDH-2,4D hybrid composite to agricultural areas could reduce the maximum 2,4D or GLY contamination and result in the retardation of herbicides leaching through the soil. This study demonstrates the potential applicability of LDHs as supports for the slow release of acid herbicides.
除草剂草甘膦（GLY）或 2,4-二氯苯氧乙酸（2,4D）被插层到 Zn-Al 层状双氢氧化物（LDH）的层间区域中，以获得 LDH-GLY 或 LDH-2,4D 杂化复合材料，因为它具有控制释放的能力。与物理混合的除草剂相比，LDH-除草剂杂化复合材料在脱碳酸蒸馏水中表现出缓慢释放的特性。发现除草剂的释放速率取决于溶液中的碳酸盐和氯离子浓度。从杂化复合材料中释放 50%的除草剂进入溶液的时间 t ，对于 LDH-GLY 为 6.5 至 18.6 h，对于 LDH-2,4D 为 10 至 21.5 h。我们的结果表明，将 LDH-GLY 或 LDH-2,4D 杂化复合材料应用于农业区可以减少最大 2,4D 或 GLY 污染，并延迟除草剂通过土壤浸出。本研究表明 LDH 作为酸除草剂缓释的载体具有潜在的适用性。
