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首页> 外文期刊>Journal of environmental science and health >Sorption kinetics and isotherm modelling of imidacloprid on bentonite and organobentonites
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Sorption kinetics and isotherm modelling of imidacloprid on bentonite and organobentonites

机译：吡虫啉在膨润土和有机膨润土上的吸附动力学和等温线模型

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摘要

Bentonite was modified by quaternary ammonium cations viz. cetytrimethylammonium (CTA), cetylpyridinium (CP), rioctylmethylammonium (TOM) and pcholine (PTC) at 100% cation exchange capacity of bentonite and was characterized by X-ray diffraction, CHNS elemental analyser and Fourier transform infrared spectroscopy. The sorption of imidacloprid on organobentonites/bentonite was studied by batch method. Normal bentonite could adsorb imidacloprid only upto 19.31-22.18% while all organobentonites except PTC bentonite (PTCB), enhanced its adsorption by three to four times. Highest adsorption was observed in case of TOM bentonite (TOMB) (76.94-83.16%). Adsorption kinetic data were fitted to pseudo-first-order, pseudo-second-order and intraparticle diffusion models. For normal bentonite data were best fitted to pseudo-first-order kinetic, while for organobentonites fitted to pseudo-second-order kinetics. Sorption data were analysed using Freundlich, Langmuir, Temkin and Dubinin-Radushkevich isotherm models. Data were well fitted to Freundlich adsorption isotherm. Product of Freundlich adsorption constant and heterogeneity parameter (K_f.1) was in following order: TOMB (301.87) > CTA bentonite (CTAB) (152.12) > CP bentonite (CPB) (92.58) > bentonite (27.25). Desorption study confirmed hysteresis and concentration dependence. The present study showed that the organobentonite could be a good sorbent for removal of imidacloprid from natural water sample also. Percentage adsorption and Distribution coefficient (mL g~(-1)) value of different adsorbent was in following order: TOMB (74.85% and 297.54) > CTAB (55.78% and 126.15) > CPB (45.81% and 84.55) > bentonite (10.65% and 11.92).
机译：膨润土被季铵阳离子改性。膨润土的阳离子交换能力为100％时的三甲基铵（CTA），十六烷基吡啶（CP），十六烷基甲基铵（TOM）和胆碱（PTC），并通过X射线衍射，CHNS元素分析仪和傅里叶变换红外光谱进行了表征。采用间歇法研究了吡虫啉在有机膨润土/膨润土上的吸附。普通膨润土最多只能吸附吡虫啉19.31-22.18％，而除PTC膨润土（PTCB）以外的所有有机膨润土，其吸附能力都提高了三到四倍。在TOM膨润土（TOMB）的情况下，吸附率最高（76.94-83.16％）。吸附动力学数据拟合拟一阶，拟二阶和颗粒内扩散模型。对于正常的膨润土，数据最适合拟一级动力学，而对于有机膨润土，数据最适合拟二级动力学。使用Freundlich，Langmuir，Temkin和Dubinin-Radushkevich等温线模型分析吸附数据。数据非常适合Freundlich吸附等温线。 Freundlich吸附常数和非均质性参数（K_f.1 / n）的乘积按以下顺序排列：TOMB（301.87）> CTA膨润土（CTAB）（152.12）> CP膨润土（CPB）（92.58）>膨润土（27.25）。解吸研究证实了磁滞和浓度依赖性。目前的研究表明，有机膨润土也可能是从天然水样中去除吡虫啉的良好吸附剂。不同吸附剂的百分比吸附和分配系数（mL g〜（-1））值依次为：TOMB（74.85％和297.54）> CTAB（55.78％和126.15）> CPB（45.81％和84.55）>膨润土（10.65） ％和11.92）。

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  • 来源
    《Journal of environmental science and health》 |2017年第6期|326-337|共12页
  • 作者

    Shailesh K. Jain; Najam A. Shakil; Anirban Dutta; Jitendra Kumar; Mukesh K. Saini;

  • 作者单位

    ICAR-Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India;

    ICAR-Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India;

    ICAR-Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India;

    ICAR-Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India,ICAR-Directorate of Medicinal & Aromatic Plants Research, Anand, Gujarat, India;

    ICAR-Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Imidacloprid; isotherm; kinetics; natural water; organobentonite; sorption;

    机译：吡虫啉;等温线动力学;天然水;有机膨润土吸附;

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