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首页> 外文期刊>RSC Advances >Gamma radiation as a green method to enhance the dielectric behaviour, magnetization, antibacterial activity and dye removal capacity of Co–Fe LDH nanosheets
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Gamma radiation as a green method to enhance the dielectric behaviour, magnetization, antibacterial activity and dye removal capacity of Co–Fe LDH nanosheets

机译：伽马射线辐射作为一种绿色方法，可增强Co-Fe LDH纳米片的介电性能，磁化强度，抗菌活性和染料去除能力

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Nowadays, improving the physico-chemical properties of nanomaterials to enhance their performance towards various applications is urgent. Accordingly, gamma irradiation (GI) has evolved and attracted wide attention as a promising green technique to meet this need. In the current study, a Co–Fe LDH was used as a model 2D nanomaterial and was irradiated by GI (dose = 100 kGy). The sample was characterized via XRD, FTIR, FESEM, HRTEM, hydrodynamic size, zeta potential, and BET surface area measurements. The results showed that after irradiation, the surface area of the sample increased from 83 to 89 m ~(2) g ~(?1) . Moreover, irradiation increased its dielectric constant, dielectric loss and AC conductivity. In addition, the sample showed superparamagnetic behavior, where its saturation magnetization increased from 1.28 to 52.04 emu g ~(?1) after irradiation. Furthermore, the adsorption capacity of the irradiated LDH towards malachite green (MG) and methylene blue (MB) as model wastewater pollutants was also studied. The exposure of LDH to GI enhanced its adsorption capacity for MG from 44.73 to 54.43 mg g ~(?1) . The Langmuir–Freundlich, Sips, and Baudu models were well suited for both MG and MB adsorption among the six fitted isotherm models. The pseudo-first and second order models fit the adsorption kinetics better than the intraparticle diffusion model for both dyes. The interaction of MB and MG with the LDH surface was further investigated in dry and aqueous solution using Grand canonical Monte Carlo and molecular dynamics simulations. These two techniques provided insight into the adsorption mechanism, which is vital to understand the adsorption process by the LDH nanosheets and their possible use in practical applications. Moreover, the Co–Fe LDH showed good antibacterial activity against both Gram-positive and Gram-negative bacteria strains. Furthermore, due to its magnetic property, the Co–Fe LDH could be simply recovered from water by magnetic separation at a low magnetic field after the adsorption process.
机译：如今，改善纳米材料的物理化学性质以增强其在各种应用中的性能已迫在眉睫。因此，伽马辐照（GI）已经发展并引起了广泛关注，作为一种有前途的绿色技术可以满足这种需求。在当前的研究中，Co-Fe LDH被用作2D模型纳米材料，并由GI（剂量= 100 kGy）照射。通过XRD，FTIR，FESEM，HRTEM，流体动力学尺寸，ζ电位和BET表面积测量对样品进行表征。结果表明，辐照后，样品的表面积从83 m〜（2）g〜（？1）增加。此外，辐照提高了其介电常数，介电损耗和交流电导率。另外，样品显示出超顺磁行为，其饱和磁化强度在辐照后从1.28增加到52.04 emu g〜（？1）。此外，还研究了辐照的LDH对孔雀绿（MG）和亚甲基蓝（MB）作为模型废水的吸附能力。 LDH对GI的暴露将其对MG的吸附能力从44.73增至54.43 mg g〜（？1）。 Langmuir–Freundlich，Sips和Baudu模型非常适合六个拟合等温线模型中的MG和MB吸附。伪一级和二级模型比两种染料的粒子内扩散模型更好地拟合了吸附动力学。 MB和MG与LDH表面的相互作用在干燥和水溶液中使用Grand经典蒙特卡洛法和分子动力学模拟进行了进一步研究。这两种技术提供了对吸附机理的深入了解，这对于了解LDH纳米片的吸附过程及其在实际应用中的可能用途至关重要。此外，Co-Fe LDH对革兰氏阳性菌和革兰氏阴性菌均显示出良好的抗菌活性。此外，由于其磁性，在吸附过程之后，可以通过在低磁场下进行磁分离从水中简单地回收Co-Fe LDH。

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