Multidisciplinary Postgraduate Program in Environmental Sciences, Av. Manuel Nava 201, 2nd. Floor, University Zone, San Luis Potosí, 78000, Mexico; Faculty of Science, University of Granada, 18071, Granada, Spain.
Multidisciplinary Postgraduate Program in Environmental Sciences, Av. Manuel Nava 201, 2nd. Floor, University Zone, San Luis Potosí, 78000, Mexico; Center for Research and Postgraduate Studies, Faculty of Engineering, Universidad Autonoma de San Luis Potosi, Dr. Manuel Nava No. 8, West University Zone, San Luis Potosí, 78290, Mexico.
Environ Res. 2024 Nov 15;261:119651. doi: 10.1016/j.envres.2024.119651. Epub 2024 Jul 31.
The characterisation of hydrochars derived from Sargassum biomass collected along the Mexican Caribbean coast reveals their favourable morphology and chemical composition for incorporating metal ions, including Cd(II) and Pb(II). Among the synthesized materials, HCS-3, produced at 180 °C with a 2 h residence time, exhibited superior yield, specific area, carbon content, and capacity for removing Cd(II) and Pb(II). Adsorption equilibrium studies demonstrate the presence of adsorption processes during Cd(II) and Pb(II) retention on HCS-3, with adsorption capacities slightly exceeding 140 and 340 mg g⁻, respectively. Notably, HCS-3 shows a greater affinity for Pb(II) over Cd(II) when both elements are present concurrently. The physicochemical analysis through FTIR spectroscopy, functional group analysis, point of zero charge determination, SEM/EDS, and other techniques evidenced that HCS-3 possesses favourable characteristics to serve as a heavy metal adsorbent. These findings underscore the efficacy of hydrochars from Sargassum biomass in removing heavy metals, suggesting their potential as superior adsorbents compared to traditional or novel materials, and advising its possible versatility for other pollutants. Utilizing these hydrochars could mitigate the economic and environmental impact of Sargassum biomass by repurposing it for valuable applications.
从墨西哥加勒比海岸收集的马尾藻生物质制备的水热炭的特性表明，其形貌和化学组成有利于金属离子（包括 Cd(II) 和 Pb(II)）的掺入。在所合成的材料中，在 180°C 下反应 2 小时制备的 HCS-3 具有较高的产率、比表面积、碳含量以及去除 Cd(II) 和 Pb(II) 的能力。吸附平衡研究表明，Cd(II)和 Pb(II)在 HCS-3 上的保留过程中存在吸附过程，吸附容量分别略超过 140 和 340mg/g。值得注意的是，当两种元素同时存在时，HCS-3 对 Pb(II)的亲和力大于 Cd(II)。通过傅里叶变换红外光谱（FTIR）、官能团分析、零电荷点测定、SEM/EDS 等技术进行的物理化学分析表明，HCS-3 具有作为重金属吸附剂的有利特性。这些发现强调了马尾藻生物质水热炭去除重金属的功效，表明其作为吸附剂优于传统或新型材料，并且可能具有用于其他污染物的多功能性。利用这些水热炭可以通过重新利用有价值的应用来减轻马尾藻生物质的经济和环境影响。
