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首页> 外文期刊>Iranian polymer journal >Enzyme-based green approach for the synthesis of gum tragacanth and acrylic acid cross-linked hydrogel: its utilization in controlled fertilizer release and enhancement of water-holding capacity of soil
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Enzyme-based green approach for the synthesis of gum tragacanth and acrylic acid cross-linked hydrogel: its utilization in controlled fertilizer release and enhancement of water-holding capacity of soil

机译：基于酶的绿色方法合成黄tr胶和丙烯酸交联水凝胶的研究：其在控制肥料释放和提高土壤持水能力中的应用

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摘要

Enzyme lipase catalyzed graft copolymeriza-tion of acrylic acid onto gum tragacanth was carried out in an aqueous medium using glutaraldehyde as a cross-linker, one more step towards green chemistry. Various reaction variables such as time, amount of solvent, temperature, pH, lipase concentration, and monomer and cross-linker concentrations were optimized to achieve a cross-linked candidate polymer with maximum fluid absorbance capacity. The structure and morphology were confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy. The synthesized hydrogel held a large amount of water and was used as a device for controlled release of urea. A 10 % (w/w) of swelled hydrogel was found to enhance the water-holding capacity of the soil. The synthesized device could increase the moisture content up to 52 % in sandy loam soil and 72 % in clay soil and was found to enhance the water-holding capability of the soil. Further, the candidate polymer was studied for the controlled release of urea under eco-friendly conditions and showed case-Ⅱ type urea release. The initial diffusion coefficient was found to be higher than the later diffusion coefficient indicating a higher urea release rate during the early stage. Thus, the synthesized polymer is important from technological point of view.
机译：使用戊二醛作为交联剂，在水性介质中进行了酶脂肪酶催化的丙烯酸到黄gum胶上的接枝共聚反应，这是向绿色化学迈进的又一步。优化各种反应变量，例如时间，溶剂量，温度，pH，脂肪酶浓度以及单体和交联剂浓度，以实现具有最大流体吸收能力的交联候选聚合物。通过傅立叶变换红外光谱和扫描电子显微镜确认了结构和形态。合成的水凝胶容纳大量的水，并用作控制释放尿素的装置。发现10％（w / w）的溶胀的水凝胶增强了土壤的持水能力。该合成装置可使沙壤土中的水分增加至52％，粘土中的水分增加至72％，从而提高了土壤的持水能力。此外，研究了在环境友好条件下尿素的控释候选聚合物，并显示了案例Ⅱ型尿素的释放。发现初始扩散系数高于后期扩散系数，表明在早期阶段较高的尿素释放速率。因此，从技术观点来看，合成的聚合物是重要的。

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  • 来源
    《Iranian polymer journal》 |2013年第8期|561-570|共10页
  • 作者

    Saruchi; Balbir Singh Kaith; Rajeev Jindal; G. S. Kapur;

  • 作者单位

    Department of Chemistry, Dr BR Ambedkar National Institute of Technology, Jalandhar, Punjab, India;

    Department of Chemistry, Dr BR Ambedkar National Institute of Technology, Jalandhar, Punjab, India;

    Department of Chemistry, Dr BR Ambedkar National Institute of Technology, Jalandhar, Punjab, India;

    Petrochemical and Polymer Division, Research and Development Centre, Indian Oil Corporation Limited, Faridabad, Haryana, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Hydrogel; Tragacanth gum; Acrylic acid; Lipase; Urea; Agriculture;

    机译：水凝胶;黄ga胶丙烯酸;脂肪酶尿素农业;

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