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首页> 外文期刊>RSC Advances >Functionalized biochar-supported magnetic MnFe2O4 nanocomposite for the removal of Pb(ii) and Cd(ii)
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Functionalized biochar-supported magnetic MnFe2O4 nanocomposite for the removal of Pb(ii) and Cd(ii)

机译：功能化生物炭负载的磁性MnFe2O4纳米复合材料用于去除Pb（ii）和Cd（ii）

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In this study, a novel magnetic biochar-MnFe _(2) O _(4) nanocomposite (BC/FM) was prepared using low-cost corn straw and MnFe _(2) O _(4) by sol–gel/pyrolyzing route using egg white, which has abundant functional groups (–NH _(2) and –COOH). Following that, its composition, morphology and structure was characterized by various techniques including SEM-EDX, BET, XRD, and VSM. Batch experiment of the adsorption for Pb( II ) and Cd( II ) including influence of pH, kinetics, isotherm and thermodynamics was also studied. The results demonstrated that biochar could effectively support MnFe _(2) O _(4) , which displayed high dispersion on the surface of the biochar and possessed abundant functional groups and high surface area contributing to superior performance on Pb( II ) and Cd( II ) removal. Therein, MnFe _(2) O _(4) with high magnetism is convenient for separating the magnetic BC/FM from an aqueous medium. Adsorption experiment results indicate that Pb( II ) and Cd( II ) removal by BC/FM was closely related to pH with the best value of pH 5.0, and the process reached equilibrium in 2 h. The adsorption process is well-described by the pseudo-second-order kinetic model and Sips (Freundlich–Langmuir) model. Thermodynamic studies suggest that the adsorption process is spontaneous and exothermic. The maximum experimental adsorption capacity of BC/FM is 154.94 and 127.83 mg g ~(?1) for Pb( II ) and Cd( II ), respectively, in single-solute system, which is higher than that of some of the other adsorbents of biochar or biochar-based composites. In bi-solute system, the preferential adsorption order of BC/FM for the two metals is Pb( II ) prior to Cd( II ). Finally, FTIR and XPS analysis verified that the main mechanism of Pb( II ) and Cd( II ) removal by BC/FM is by forming Pb/Cd–O or complexation of carboxyl and hydroxyl and ion exchange. Therefore, the prepared magnetic BC/FM composite, as an excellent adsorbent, exhibited potential applications for the removal of Pb( II ) and Cd( II ) from wastewater.
机译：在这项研究中，使用低成本玉米秸秆和MnFe _（2）O _（4）通过溶胶-凝胶/热解制备了一种新型的磁性生物炭-MnFe _（2）O _（4）纳米复合材料（BC / FM）。使用具有丰富功能基团（–NH _（2）和–COOH）的蛋白进行合成。随后，通过包括SEM-EDX，BET，XRD和VSM在内的各种技术对它的组成，形态和结构进行了表征。还研究了对Pb（II）和Cd（II）吸附的分批实验，包括pH，动力学，等温线和热力学的影响。结果表明，生物炭可以有效地支撑MnFe _（2）O _（4），MnFe _（2）O _（4）在生物炭的表面上具有较高的分散性，并具有丰富的官能团和高表面积，有助于Pb（II）和Cd（ II）去除。其中，具有高磁性的MnFe _（2）O _（4）便于将磁性BC / FM与水性介质分离。吸附实验结果表明，BC / FM去除Pb（II）和Cd（II）与pH密切相关，最佳pH值为5.0，在2 h内达到平衡。假二阶动力学模型和Sips（Freundlich–Langmuir）模型很好地描述了吸附过程。热力学研究表明吸附过程是自发的并且放热的。在单溶质体系中，BC / FM对Pb（II）和Cd（II）的最大实验吸附容量分别为154.94和127.83 mg g〜（？1），高于某些其他吸附剂的吸附容量。生物炭或基于生物炭的复合材料。在双溶质体系中，两种金属的BC / FM优先吸附顺序是Cd（II）之前的Pb（II）。最终，FTIR和XPS分析证实了BC / FM去除Pb（II）和Cd（II）的主要机理是通过形成Pb / Cd-O或羧基与羟基的络合和离子交换。因此，制备的磁性BC / FM复合材料作为一种优异的吸附剂，具有从废水中去除Pb（II）和Cd（II）的潜在应用。

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