Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, Pakistan.
Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, Pakistan.
Ecotoxicol Environ Saf. 2020 Mar 1;190:110099. doi: 10.1016/j.ecoenv.2019.110099. Epub 2020 Jan 7.
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 for epichlorohydrin and 7.01 mgg 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 and 13.99 ngL (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.
在提出的方法中，合成了铁交联的藻酸盐包封的磁性氧化石墨烯珠，并将其用作吸附剂，用于从水样中微萃取内分泌干扰化合物，然后通过高效液相色谱法与紫外检测器进一步分析。使用光谱技术对珠进行了表征，例如傅里叶变换红外光谱法用于确定不同的功能团，扫描电子显微镜法用于表面形态，X 射线衍射法用于相确定和能量色散 X 射线光谱法用于元素组成。结果表明，珠的表面具有藻酸盐和氧化石墨烯的功能团，这些功能团参与了双酚 A 和环氧氯丙烷的吸附的 π-π、n-π 相互作用和氢键。研究了两种内分泌干扰化合物（环氧氯丙烷和双酚 A）的实验条件，并在最佳条件下，环氧氯丙烷的吸附容量为 6.73 mgg，双酚 A 的吸附容量为 7.01 mgg。动力学和平衡研究表明，吸附过程遵循准二级动力学和朗缪尔平衡模型。计算了用于微萃取环氧氯丙烷和双酚 A 的分析参数。环氧氯丙烷和双酚 A 的检出限分别为 8.25 ngL 和 13.99 ngL（n = 4）。用于微萃取的不同溶剂和两种内分泌干扰化合物的最大萃取均使用甲醇获得。该方法已应用于加标样品，环氧氯丙烷和双酚 A 的回收率分别为 97.17 ± 3.13%和 99.46 ± 1.39%。藻酸盐包封的磁性氧化石墨烯表现出非毒性的绿色化学特性，具有在水处理中萃取有毒有机化合物的高萃取性能。
