Enhanced adsorption of copper citrate complexes by ferromanganese oxide biochar from water: performance and mechanism

意象 Pub Date : 2025-01-01 DOI:10.48130/bchax-0025-0001

Ying Zhu, Xiang Lei, Jianguo Liu, Yiting Li, Wenhong Fan

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Abstract

The removal of metal complexes from water is more challenging compared with metal ions due to their stable structure. This study developed an efficient ferromanganese oxide-modified biochar and explored the preparation conditions in detail. The surface of ferromanganese oxide-modified biochar was uniformly loaded with 100 nm nanoparticles, mainly comprising Mn₃O₄ and (FeO)_0.099(MnO)_0.901, and exhibited excellent copper citrate (CuCA) adsorption capacity. The removal rate of CuCA at an initial concentration of 10 mg L^–1 by 1 g L^–1 modified biochar reached 99.5% for Cu and 92.6% for total organic carbon (TOC), with a copper adsorption capacity of 3.79 mg g^–1. The mechanisms of using modified biochar to remove CuCA include chemical adsorption at the bimetallic oxide's active sites and oxygen-containing functional groups on the surface of the biochar, as well as physical adsorption due to the porous structure of biochar. The modified biochar has significant potential for development in the removal of metal complexes in water with the advantage of efficient and easy preparation, good performance, and stability across a wide pH range and with some coexisting ions.

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氧化锰铁生物炭增强对水中柠檬酸铜配合物的吸附性能及机理

与金属离子相比，从水中去除金属配合物由于其稳定的结构更具挑战性。本研究开发了一种高效的氧化锰铁改性生物炭，并对其制备条件进行了详细的探讨。氧化锰铁修饰的生物炭表面均匀负载了以Mn3O4和（FeO）0.099(MnO)0.901为主的100 nm纳米颗粒，并表现出优异的柠檬酸铜（CuCA）吸附能力。在初始浓度为10 mg L-1时，1 g L-1改性生物炭对Cu的去除率为99.5%，对总有机碳（TOC）的去除率为92.6%，对铜的吸附量为3.79 mg g - 1。改性生物炭去除CuCA的机理包括生物炭表面双金属氧化物活性位点和含氧官能团的化学吸附以及生物炭多孔结构的物理吸附。改性生物炭具有制备简便、性能好、在较宽的pH范围内及与部分共存离子稳定等优点，在去除水中金属配合物方面具有很大的发展潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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