In the proposed method iron crosslinked alginate encapsulated magnetic graphene oxide beads were synthesized and used as an adsorbent for the microextraction of endocrine disrupting compounds from water samples and further analyzed by high performance liquid chromatography with ultraviolet detector. The beads were characterized using spectroscopic techniques, such as Fourier transform infra-red spectroscopy for the determination of different functional groups, Scanning electron microscopy for surface morphology, X-ray diffraction for phase determination and energy dispersive X ray spectroscopy for elemental composition. The results revealed that beads surface have functional groups of alginate and graphene oxide which are involved in π-π, n-πinteractions and hydrogen bonding for the bisphenol A and epichlorohydrin adsorption. The experimental conditions were studied for two endocrine disrupting compounds (Epichlorohydrin ad Bisphenol A) and at optimum conditions the adsorption capacity was 6.73 mgg-1 for epichlorohydrin and 7.01 mgg-1 for bisphenol A. The kinetic and equilibrium studies revealed that the adsorption process follow pseudo-second order kinetics and Langmuir equilibrium models. Analytical parameters were calculated for the microextraction of epichlorohydrin and bisphenol A. Limit of detection was 8.25 ngL-1 and 13.99 ngL-1 (n = 4) for epichlorohydrin and bisphenol A, respectively. Different solvents used for microextraction and maximum extraction of both endocrine disrupting compounds were obtained with methanol. The proposed method was applied to spiked samples and the recovery values were 97.17 ± 3.13% for epichlorohydrin and 99.46 ± 1.39% for bisphenol A. The magnetic graphene oxide encapsulated inside an alginate shows nontoxic green chemical with high extraction performance for toxic organic compounds in water treatment.

中文翻译：

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环保型藻酸盐封装的氧化石墨烯磁珠，用于从水样中固相微萃取内分泌干扰化合物。

在所提出的方法中，合成了铁交联的藻酸盐包封的磁性氧化石墨烯微珠，并用作从水样中微萃取内分泌干扰物的吸附剂，并通过带有紫外检测器的高效液相色谱进行了进一步分析。使用光谱技术对小珠进行表征，例如傅立叶变换红外光谱法测定不同的官能团，扫描电子显微镜测定表面形态，X射线衍射测定相和能量分散X射线光谱测定元素组成。结果表明，珠子表面具有藻酸盐和氧化石墨烯的官能团，它们参与双酚A和表氯醇的π-π，n-π相互作用和氢键结合。研究了两种破坏内分泌的化合物（表氯醇和双酚A）的实验条件，在最佳条件下对表氯醇的吸附容量为6.73 mgg-1，对双酚A的吸附容量为7.01 mgg-1。动力学和平衡研究表明，吸附过程遵循拟二阶动力学和Langmuir平衡模型。计算了表氯醇和双酚A的微萃取分析参数。表氯醇和双酚A的检出限分别为8.25 ngL-1和13.99 ngL-1（n = 4）。用甲醇获得了用于微萃取和最大程度萃取两种内分泌干扰化合物的不同溶剂。所提方法用于加标样品，表氯醇的回收率为97.17±3.13％，表氯醇的回收率为99.46±1。