Wang Yi-Tong, Zhang Liang-Yi, Kang Le-Le, Wang Ya-Jun, Li Jun-Guo, Zhao Hang, Dong Kai-Li, Li Hong-Peng, Guo Xuan, Dong Ren-Long, Chen Ming-Ming, Fang Zhen
College of Metallurgy and Energy, North China University of Science and Technology, 21 Bohai Street, Tangshan 063210, China; Yanzhao Iron and Steel Laboratory, North China University of Science and Technology, 21 Bohai Street, Tangshan 063210, China.
College of Metallurgy and Energy, North China University of Science and Technology, 21 Bohai Street, Tangshan 063210, China.
Ecotoxicol Environ Saf. 2025 Sep 1;302:118539. doi: 10.1016/j.ecoenv.2025.118539. Epub 2025 Jun 19.
Chromium (Cr) is one of the most common pollutants in aquatic ecosystems, posing a serious threat to environmental protection and biological survival. In this study, the adsorbents, prepared from the residue of extracting lipids, polysaccharides and proteins from Chlorella pyrenoidosa, are investigated for effectively purring the Cr (VI)-containing wastewater. The lipid, polysaccharide and protein are identified to having potential for the preparation of biodiesel, food component substitution and feed production, respectively. Meanwhile, Cr (VI) adsorbents are achieved from these extracted residues. The results show that a porous structure with sufficient active functional groups (O-H, pyrrole N, CO, C-O-C, C-O and pyridine N) and remarkable surface area can be well realized. All active functional groups present the effective adsorption performance for removing the Cr (VI) ions from the wastewater due to their active negative adsorption energies, especially -OH and pyrrole N (O-H = -2.86 eV > pyrrole N = -2.80 eV > CO = -2.30 eV > C-O = -2.16 eV > C-O-C = -2.14 eV > pyridine N = -1.87 eV). Under the conditions of high Cr (VI) concentration of 300 mg/L, the amount of absorbent needed for adsorption is reduced from 8 g/L (original algal residue) to 4 g/L (modified biochar). And removal rate of Cr (VI) is dramatically increased from 60.94 % (L), 60.57 % (S) and 46.48 % (P) to 98.99 % (LCK), 96.39 % (SCK) and 94.73 % (PCK). This study provides an achievable approach for the comprehensive utilization of Chlorella pyrenoidosa from extracting valuable biomass to effectively treating Cr (VI)-containing wastewater.
铬（Cr）是水生生态系统中最常见的污染物之一，对环境保护和生物生存构成严重威胁。在本研究中，对由从蛋白核小球藻中提取脂质、多糖和蛋白质后的残渣制备的吸附剂进行了研究，以有效处理含铬（VI）废水。已确定脂质、多糖和蛋白质分别具有制备生物柴油、替代食品成分和生产饲料的潜力。同时，从这些提取残渣中获得了铬（VI）吸附剂。结果表明，可以很好地实现具有足够活性官能团（O-H、吡咯N、CO、C-O-C、C-O和吡啶N）和显著表面积的多孔结构。由于其活性负吸附能，所有活性官能团对从废水中去除铬（VI）离子均具有有效的吸附性能，尤其是-OH和吡咯N（O-H = -2.86 eV > 吡咯N = -2.80 eV > CO = -2.30 eV > C-O = -2.16 eV > C-O-C = -2.14 eV > 吡啶N = -1.87 eV）。在铬（VI）高浓度为300 mg/L的条件下，吸附所需吸附剂的量从8 g/L（原始藻类残渣）降至4 g/L（改性生物炭）。铬（VI）的去除率从60.94%（L）、60.57%（S）和46.48%（P）显著提高到98.99%（LCK）、96.39%（SCK）和94.73%（PCK）。本研究为从提取有价值的生物质到有效处理含铬（VI）废水的蛋白核小球藻综合利用提供了一种可行的方法。
