Yu Weiling, Xie Zhouyun, Zhang Ni, Tang Li, Xia Jingfen, Ye Jien, Liu Xuran, Wang Dongbo, Yang Guojing
College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo, 315100, People's Republic of China.
College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
Sci Rep. 2025 Jul 1;15(1):21745. doi: 10.1038/s41598-025-05714-6.
Managing dye contaminants is a major challenge in modern water governance. This study developed a KOH-activated Spartina alterniflora biochar (KBC) adsorbent for removing Rhodamine B (RhB) dye from water. Microscopic analysis validated the presence of an appealing porous structure and surface functionalities that are key for the adsorption of RhB. KBC demonstrated an enormous specific surface area, providing many active sites (3109.67 m·g). Optimal circumstances for eliminating RhB were achieved an impressive 89.77% at a pH level of 7, utilizing a KBC dosage of 100 mg/100 mL over a contact period of 48 h, resulting in a maximum adsorption capacity of 1820.47 mg·g. Furthermore, according to the findings, pseudo-second-order, Langmuir, and Freundlich models offered a precise match of the batch experiment results. The combined effects of the KBC pore filling, π-π electron donor-acceptor (π-π EDA), hydrogen bonding, and electrostatic interactions facilitated both physical and chemical adsorption mechanisms, which in turn bolstered the biochar's superior adsorption capabilities. These results underscore the viability of KBC as a promising candidate for water purification, demonstrating its potential to eliminate RhB from polluted waters for sustainable cleanup efforts effectively and the resource utilization of waste.
管理染料污染物是现代水治理中的一项重大挑战。本研究开发了一种KOH活化的互花米草生物炭（KBC）吸附剂，用于去除水中的罗丹明B（RhB）染料。微观分析证实了存在吸引人的多孔结构和表面官能团，这是吸附RhB的关键。KBC表现出巨大的比表面积，提供了许多活性位点（3109.67 m²/g）。在pH值为7的条件下，使用100 mg/100 mL的KBC剂量，接触时间为48小时，去除RhB的最佳条件下实现了令人印象深刻的89.77%，最大吸附容量为1820.47 mg/g。此外，根据研究结果，准二级、朗缪尔和弗伦德利希模型与批量实验结果精确匹配。KBC孔隙填充、π-π电子供体-受体（π-π EDA）、氢键和静电相互作用的综合作用促进了物理和化学吸附机制，进而增强了生物炭卓越的吸附能力。这些结果强调了KBC作为水净化有前景候选物的可行性，证明了其有效从污染水中去除RhB以进行可持续清理工作以及废物资源利用的潜力。
