CAJ | 학술논문

　　缓释剂的使用是提高农药效率和减少环境污染的有效策略。以四甲基氯化铵、十二烷基三甲基氯化铵和十六烷基三甲基氯化铵为改性剂制备系列有机膨润土，研究其对吡虫啉的等温吸附，分析吡虫啉在有机膨润土的吸附机理和影响因素。结果显示，与未改性膨润土相比，有机改性膨润土极大增强了膨润土对吡虫啉的吸附性能。吡虫啉分子具有较强的极性，无论是短碳链有机膨润土还是长碳链有机膨润土，暴露的硅氧烷表面相对于碳氢基团具有更强的吸附作用，延长季铵盐改性剂的碳链长度增强了有机膨润土对吡虫啉的吸附系数，但是降低了标碳化吸附系数。季铵盐载量对有机膨润土吸附性能的影响与其在膨润土的负载机理有关，载量小于1.0 CEC时，季铵盐主要以离子交换方式吸附到膨润土层间域，增加季铵盐用量可增强有机膨润土对吡虫啉的吸附能力。随着载量的进一步增加，超过可交换阳离子总量的季铵盐以分子形式进入膨润土层间域，降低了膨润土层间域的疏水性及其对吡虫啉的吸附能力。
　　완석제적사용시제고농약효솔화감소배경오염적유효책략。이사갑기록화안、십이완기삼갑기록화안화십륙완기삼갑기록화안위개성제제비계렬유궤팽윤토，연구기대필충람적등온흡부，분석필충람재유궤팽윤토적흡부궤리화영향인소。결과현시，여미개성팽윤토상비，유궤개성팽윤토겁대증강료팽윤토대필충람적흡부성능。필충람분자구유교강적겁성，무론시단탄련유궤팽윤토환시장탄련유궤팽윤토，폭로적규양완표면상대우탄경기단구유경강적흡부작용，연장계안염개성제적탄련장도증강료유궤팽윤토대필충람적흡부계수，단시강저료표탄화흡부계수。계안염재량대유궤팽윤토흡부성능적영향여기재팽윤토적부재궤리유관，재량소우1.0 CEC시，계안염주요이리자교환방식흡부도팽윤토층간역，증가계안염용량가증강유궤팽윤토대필충람적흡부능력。수착재량적진일보증가，초과가교환양리자총량적계안염이분자형식진입팽윤토층간역，강저료팽윤토층간역적소수성급기대필충람적흡부능력。
The use of controlled release formulation ( CRF) is one of the best strategies to reduce the use and impact of pesticides in the environment .To provide the fundamental information for the preparation of CRF of imidacloprid by employing bentonite as matrix of low cost , tetramethylammoni-um chloride , dodecyltrimethylammonium chloride and hexadecyltrimethylammonium chloride were used as modifying agents to prepare organobentonite with different loading levels and the isothermal adsorption of imidacloprid was investigated .Compared with the raw bentonite , the adsorption capac-ity of organobentonite towards imidacloprid was greatly enhanced and was found to be related to the structural feature of the adsorbent and adsorbate .Owning to the polarity of imidacloprid , the hydro-carbon surface of both short-and long-chain organobentonite was less effective than the exposed si-loxane surface in the adsorption process .Although the adsorption coefficient of organobentonite in-creased , the organic carbon content normalized adsorption coefficient decreased with increasing car -bon chain of modifying agents .The adsorption of imidacloprid was found to be related to the surfac-tant loading level and the loading process on bentonite .An increase of quaternary ammonium loading less than the cationic exchange capacity , via electrostatic interaction , increased the adsorption ca-pacity of organobentonite .At higher loading level , the molecule form surfactant entered the benton-ite interlayer , leading to a decrease in hydrophobicity of the interlayer organic phase and its affinity to imidacloprid .