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用于去除Pb(ii)和Cd(ii)的功能化生物炭负载磁性MnFeO纳米复合材料

Functionalized biochar-supported magnetic MnFeO nanocomposite for the removal of Pb(ii) and Cd(ii).

作者信息

Zhang Lianke, Guo Jinyue, Huang Xuemin, Wang Weida, Sun Peng, Li Yumei, Han Jianhong

机构信息

School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology Xi'an 710055 PR China

School of Energy and Environment, Inner Mongolia University of Science and Technology Baotou 014010 PR China.

出版信息

RSC Adv. 2019 Jan 2;9(1):365-376. doi: 10.1039/c8ra09061k. eCollection 2018 Dec 19.

DOI:10.1039/c8ra09061k
PMID:35521601
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9059321/
Abstract

In this study, a novel magnetic biochar-MnFeO nanocomposite (BC/FM) was prepared using low-cost corn straw and MnFeO by sol-gel/pyrolyzing route using egg white, which has abundant functional groups (-NH 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 MnFeO, 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, MnFeO 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 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.

摘要

在本研究中，利用低成本的玉米秸秆和锰铁氧体，通过溶胶 - 凝胶/热解路线，以具有丰富官能团（-NH和-COOH）的蛋清为原料，制备了一种新型磁性生物炭 - 锰铁氧体纳米复合材料（BC/FM）。随后，采用扫描电子显微镜 - 能谱仪（SEM-EDX）、比表面积分析仪（BET）、X射线衍射仪（XRD）和振动样品磁强计（VSM）等多种技术对其组成、形态和结构进行了表征。还研究了BC/FM对Pb(ii)和Cd(ii)的吸附批次实验，包括pH值的影响、动力学、等温线和热力学。结果表明，生物炭能够有效地负载锰铁氧体，锰铁氧体在生物炭表面高度分散，具有丰富的官能团和高比表面积，有助于在去除Pb(ii)和Cd(ii)方面表现出优异的性能。其中，具有高磁性的锰铁氧体便于从水介质中分离磁性BC/FM。吸附实验结果表明，BC/FM对Pb(ii)和Cd(ii)的去除与pH值密切相关，最佳pH值为5.0，该过程在2小时内达到平衡。吸附过程可用准二级动力学模型和Sips（Freundlich-Langmuir）模型很好地描述。热力学研究表明，吸附过程是自发的且放热的。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，高于一些其他生物炭或生物炭基复合材料吸附剂。在双溶质体系中，BC/FM对两种金属的优先吸附顺序为Pb(ii)优于Cd(ii)。最后，傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析证实，BC/FM去除Pb(ii)和Cd(ii)的主要机制是通过形成Pb/Cd-O或羧基和羟基的络合以及离子交换。因此，制备的磁性BC/FM复合材料作为一种优良的吸附剂，在去除废水中的Pb(ii)和Cd(ii)方面展现出潜在的应用前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b625/9059321/d00cf2f54534/c8ra09061k-f10.jpg
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