Enhanced removal of Co(II) and Ni(II) from high-salinity aqueous solution using reductive self-assembly of three-dimensional magnetic fungal hyphal/graphene oxide nanofibers
Enhanced removal of Co(II) and Ni(II) from high-salinity aqueous solution using reductive self-assembly of three-dimensional magnetic fungal hyphal/graphene oxide nanofibers
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利用三维磁性真菌菌丝/氧化石墨烯纳米纤维的还原自组装增强高盐水溶液中 Co(II) 和 Ni(II) 的去除
DOI：
10.1016/j.scitotenv.2020.143871
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发表时间：
2021-02-20
影响因子：
9.8
通讯作者：
Wang, Yangyang
中科院分区：
文献类型：
--
作者：
Chen, Runhua;Cheng, Yuying;Wang, Yangyang
层状氧化石墨烯是一种优良的改性载体，但其可回收性和稳定性较差，限制了其在废水处理领域的应用。本文采用还原自组装（RSA）方法组装了三维磁性真菌菌丝/氧化石墨烯纳米纤维（MFHGs），用于从高盐度水溶液中高效捕获Co（II）和Ni（II）。RSA战略成本低廉、生态友好且易于推广。所得MFHG提高了氧化石墨烯的分散性和稳定性，并表现出优异的磁化强度和大的介电常数，从而获得令人满意的固液分离性能和更致密的沉积物。批处理实验结果表明，在pH为6.0、2g/L的Na 2SO 4水溶液中，323 K时，MFHG对Ni（II）和Co（II）的最大去除量分别为97.44和104.34 mg/g，并考察了初始pH和离子强度对去除效果的影响。产率残留分析表明，MFHG的高孔隙率和含氧官能团显着提高了其Co（II）和Ni（II）的去除能力。根据分析，羟基和胺基参与了去除Co（II）和Ni（II）的化学反应，阳离子交换化学吸附在去除Co（II）和Ni（II）的过程中占主导地位。根据甲烷甲烷气体的特性，提出了一种连续流循环反应器（CFRR），用于处理紧急水溶液，并表现出令人满意的去除效率和再生性能。MFHGs和建议的CFRR的组合是一个有前途的水处理策略，快速处理应用。(C)2020 Elsevier B. V.保留所有权利。
Layer-structured graphene oxide excellent carrier for modifications; however, its poor recoverability and stability preclude its application in wastewater treatment fields. Herein, three-dimensional magnetic fungal hyphal/graphene oxide nanofibers (MFHGs) were assembled by a reductive self-assembly (RSA) strategy for the efficient capture of Co(II) and Ni(II) from high-salinity aqueous solution. The RSA strategy is inexpensive, eco-friendly and easy to scale up. The obtained MFHGs enhanced the dispersity and stability of graphene oxide and exhibited excellent magnetization and large coercivity, leading to satisfactory solid-liquid separation performance and denser sediment. The results of batch removal experiments showed that the maximum removal capacity of MFHGs for Ni(II) and Co(II) was 97.44 and 104.34 mg/g, respectively, in 2 g/L Na2SO4 aqueous solution with a pH of 6.0 at 323 K, and the effects of initial pH and ionic strength on Co(II) and Ni(II) removal were explored. Yield residue analysis indicated that the high porosity and oxygen-containing functional groups of MFHGs remarkably improved their Co(II)- and Ni(II)-removal capacities. According to the analysis, hydroxyl groups and amine groups participated in the chemical reaction of Co(II) and Ni(II) removal, and cation-exchange chemical adsorption was dominant during the Co(II)- and Ni(II)-removal process. Based on the attributes of MFHGs, a continuous-flow recycle reactor (CFRR) was proposed for emergency aqueous solution treatment and exhibited satisfactory removal efficiency and regeneration performance. The combination of MFHGs and the proposed CFRR is a promising water treatment strategy for rapid treatment applications. (C) 2020 Elsevier B.V. All rights reserved.