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Microalgae realizes self N-doped biochar for heavy metal polluted sediment remediation
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-04 , DOI: 10.1016/j.jhazmat.2024.135746
Weicong Wang 1 , Shuangqi Wu 1 , Jianshi Huang 1 , Xueqi Zhang 1 , Jiawei Xie 1 , Yebin Lu 2 , Jianfeng Li 2 , Jun Wei 2 , Boran Wu 3 , Shuiping Cheng 3
Affiliation  

Heavy metal contamination in sediment has become a significant global environmental challenge. Numerous studies have demonstrated the effectiveness of modified biochar to solve heavy metal contamination in sediment. However, the modification process with complex methods and expensive modifiers prevented its large-scale application. In this study, an N self-doped biochar was obtained by pyrolysis of Spirulina sp. (SBC). Meanwhile, the K2CO3 impregnation method was utilized to prepare Spirulina sp. biochar (KSBC), which demonstrated a higher specific surface area (874 m2/g) and richer O, N functional groups. The adsorption capacity of KSBC550–120 for Cu (Ⅱ), Zn (Ⅱ), and Cd (Ⅱ) was 57.9 ± 0.3 mg/g, 43.6 ± 0.7 mg/g, and 63.9 ± 0.6 mg/g, respectively. The adsorption process is primarily governed by chemical processes, mainly through ion exchange, surface complexation, dissolution-precipitation, electrostatic interactions, adsorption-reduction, and cation-π interactions. Moreover, utilizing KSBC550–120 for mixing or capping effectively reduced heavy metal concentrations in both the overlying and pore water of the sediments. 1.0 wt% KSBC550–120 with capping treatment significantly reduced the release of heavy metals from the sediment by 80.3–91.9%. This study provides effective theoretical support for re-utilizing waste algal residues and remediation of the heavy metal-contaminated river and lake sediments using microalgae biochar.

中文翻译:


微藻实现自氮掺杂生物炭修复重金属污染沉积物



沉积物中的重金属污染已成为一项重大的全球环境挑战。大量研究表明,改性生物炭可以有效解决沉积物中的重金属污染。然而,具有复杂方法和昂贵修饰剂的修饰过程阻碍了它的大规模应用。在本研究中,通过热解螺旋藻属 (SBC) 获得了 N 自掺杂生物炭,同时,利用 K2CO3 浸渍法制备螺旋藻属生物炭 (KSBC),其表现出更高的比表面积 (874 m2/g) 和更丰富的 O、N 官能团。Cu (II.)、Zn (II.) 和 Cd (II.) 的吸附容量分别为 KSBC550 57.9 ± 0.3 mg/g、43.6 ± 0.7 mg/g 和 63.9 ± 0.6 mg/g。吸附过程主要受化学过程控制,主要通过离子交换、表面络合、溶解-沉淀、静电相互作用、吸附-还原和阳离子-π相互作用。此外,利用 KSBC550-120 进行混合或封盖可有效降低沉积物上覆水和孔隙水中的重金属浓度。1.0 wt% KSBC550–120 加帽处理可显着减少沉积物中重金属的释放 80.3–91.9%。本研究为利用微藻生物炭对废弃藻渣进行再利用和修复受重金属污染的河流和湖泊沉积物提供了有效的理论支持。
更新日期:2024-09-04
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