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首页> 外文期刊>Environmental Science & Technology >Development of a Hydrogel-Based Reactive Matrix for Removal of Chloracetanilide Herbicides from Contaminated Water
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Development of a Hydrogel-Based Reactive Matrix for Removal of Chloracetanilide Herbicides from Contaminated Water

机译：基于水凝胶的活性基质去除污水中氯乙酰苯胺除草剂的开发

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Biodegradable, high-affinity hydrogel-based beads may prove useful in the decontamination of waters containing pesticide residue. Ethanethiol-cellulose beads, with a thiol content of up to 160 μmol -SH mL~(-1) bead, were synthesized by a novel method using 1, 1'-carbonyldiimidazole followed by reaction with ami-noethanethiol. The use of thiol-derivatized beads to remove metolachlor from aqueous solutions, via a nucleophilic substitution reaction involving the α-carbon of the chloroacetamido group of metolachlor and the thiol group of the bead (i.e., covalent bond formation), was investigated using batch reaction conditions and fixed-bed column techniques. In batch reaction studies, ethanethiol-cellulose beads (160 μmol -SH mL~(-1) bead) exhibited binding capacities of up to 180 μmol metolachlor mL~(-1) bead (or about 1300 μmol g~(-1)) depending on the solution pH and temperature. When the ethanethiol-cellulose beads were suspended in an aqueous solution at pH 9 and incubated at 40℃, their binding capacity for metolachlor was about equal to that of activated carbon on a per gram adsorbent basis. Though the fixed-bed column studies revealed that the derivatized beads (131 μmol -SH mL~(-1) bead) possessed a large capacity for metolachlor, high effluent quality could not be maintained over extended column operation under the conditions employed. Metolachlor was not removed from solution under batch reaction conditions or in the fixed-bed columns when unmodified cellulose beads replaced thiol-derivatized beads. The results of our investigation demonstrate that ethanethiol-cellulose beads can be used to decontaminate water containing metolachlor and possibly other pesticides with reactive electrophilic centers.
机译：可生物降解的，高亲和力的基于水凝胶的珠子可证明对含有农药残留物的水进行净化处理很有用。通过新颖的方法，使用1，1'-羰基二咪唑，然后与氨基乙硫醇反应，合成了硫醇含量高达160μmol-SH mL〜（-1）的乙硫醇纤维素珠。通过分批反应，研究了巯基衍生化珠子通过涉及甲磺胺氯仿乙酰胺基团的α-碳和珠子硫醇基团的亲核取代反应（即共价键形成）从水溶液中去除异丙甲草胺的方法。条件和固定床色谱柱技术。在分批反应研究中，乙硫醇纤维素珠（160μmol-SH mL〜（-1）珠）的结合能力高达180μmol异丙甲草胺mL〜（-1）珠（或约1300μmolg〜（-1））取决于溶液的pH和温度。当将乙硫醇纤维素珠粒悬浮在pH 9的水溶液中并在40℃下温育时，按每克吸附剂计算，它们对甲草胺的结合能力约等于活性炭的结合能力。尽管固定床色谱柱研究表明衍生化的珠粒（131μmol-SH mL〜（-1）珠粒）具有对甲草胺的大容量，但在所采用的条件下，延长色谱柱操作仍无法保持较高的流出质量。当未改性的纤维素珠粒代替硫醇衍生化的珠粒时，在间歇反应条件下或在固定床色谱柱中未从溶液中除去甲草胺。我们的研究结果表明，乙硫醇纤维素珠可以用来净化含有甲草胺和其他可能具有反应性亲电中心农药的水。

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