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

作者：Ying Zhu, Xiang Lei, Jianguo Liu, Yiting Li, Wenhong Fan · 发表于：Biochar X · 年份：2025 · DOI：10.48130/bchax-0025-0001 · 研究领域：Adsorption and biosorption for pollutant removal、Phosphorus and nutrient management、Advanced oxidation water treatment

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 Mn 3 O 4 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.