Lin Qian,Zheng Zeng,Shuyuan Zhang,Kai Xia,Yongfu Guo
In the present work, a poly-o-vanillin-functionalized magnetic nanoparticle of PoVan/CoFe2O4@mSiO2 with core–shell structure was synthesized through a facile, green and low cost method. The rapid removal of Hg(II) by the prepared nanocomposites was researched by batch adsorption experiments and the adsorption conditions were optimized with response surface methodology (RSM). The optimization of RSM shows that the as-prepared PoVan/CoFe2O4@mSiO2 magnetic nanomaterial has a maximal adsorption capability of 263.6 mg g−1 toward Hg(II) ions. The removal process of Hg(II) ions acts in accordance with Langmuir and pseudo-second-order kinetic models. The Dubinin-Radushkevich calculation indicates that the removal process is spontaneous and exothermic. In addition, the adsorption of Hg(II) ions onto PoVan/CoFe2O4@mSiO2 is mainly completed through forming a stable complex by electrostatic attraction and chelation. The adsorption efficiency of the regenerated adsorbent is still high after five cycles. The used adsorbent of PoVan/CoFe2O4@mSiO2 has good magnetic property and can easily be separated from aqueous solution. The results indicate that the magnetic nanomaterial PoVan/CoFe2O4@mSiO2 could be a promising adsorbent to remediate mercury pollution from wastewater.
Abstract o -Vanillin is a natural product that has been widely applied in the food and pharmaceutical industries. In this study, we determined that o -vanillin can strongly inhibit the growth of Aspergillus flavus mycelia. However, the inhibition mechanism of o -vanillin is still elusive. The ultrastructural morphology of mycelia was injured, and the cell walls were destroyed. The OH functional groups on cell walls were altered, and the content of protein in mycelial cell walls was reduced by o -vanillin. The content of β-1,3-glucan in cell walls was significantly ( P < 0.05) reduced by o -vanillin in a dose-dependent manner, while chitin was not markedly affected. Moreover, o -vanillin led to an increase in the permeability of cell membranes. o -Vanillin also exhibited a promising antifungal effect on contaminated corn kernels. Therefore, o -vanillin inhibited the growth of mycelia by disrupting the integrity of cell walls and cell membranes. This study not only sheds light on the antifungal mechanism of o -vanillin but also indicates that it is a promising agent for the control of A. flavus infection. Key points o -Vanillin has strong inhibitory effects on A. flavus. o -Vanillin destroyed the integrity of cell walls and cell membranes. o -Vanillin could effectively inhibit the growth of A. flavus on corn kernels.
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