Enhancement of Tetradesmus obliquus Adsorption for Heavy Metals Through Lysine Addition: Optimization and Competitive Study

IF 1.4 4区环境科学与生态学 Q4 WATER RESOURCES

Water SA Pub Date : 2025-03-22 DOI:10.3390/w17070935

Qun Wei, Hai‐Jian Sun, H. P. Qi, Conghan Wang, Gairen Yang, Xiangmeng Ma

{"title":"Enhancement of Tetradesmus obliquus Adsorption for Heavy Metals Through Lysine Addition: Optimization and Competitive Study","authors":"Qun Wei, Hai‐Jian Sun, H. P. Qi, Conghan Wang, Gairen Yang, Xiangmeng Ma","doi":"10.3390/w17070935","DOIUrl":null,"url":null,"abstract":"Heavy metal wastewater often contains multiple metal ions, and competition among them reduces the adsorption efficiency of microalgae. Enhancing this efficiency is crucial for improving heavy metal removal. This study optimized lysine addition to facilitating the formation of a ternary complex between microalgae, lysine, and heavy metals, thereby enhancing adsorption in both single- and mixed-metal systems. In a single-metal system at 64 mg/L, lysine improved the removal rates of copper, zinc, and cadmium by 13.96%, 41.21%, and 33.26%, respectively. In binary systems (Cu-Zn, Cu-Cd, and Cu-Pb) at 32 mg/L, lysine increased copper adsorption by 11.81%, 15.71%, and 25.25%, while improving zinc, cadmium, and lead adsorption by 15.41%, 12.51%, and 3.93%, respectively. Competitive adsorption analysis revealed that lead most strongly inhibited copper adsorption, while copper significantly suppressed zinc adsorption. Mechanistic investigations using 3D-EEM, FTIR, and XPS demonstrated that humic substances in the extracellular polymeric substances (EPSs) of microalgae play a key role in lysine binding. This interaction increases the number of carboxyl functional groups on the cell surface, thereby enhancing the microalgae’s capacity to adsorb heavy metals.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"17 7","pages":"935-935"},"PeriodicalIF":1.4000,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/17/7/935/pdf?version=1742802436","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water SA","FirstCategoryId":"0","ListUrlMain":"https://doi.org/10.3390/w17070935","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"WATER RESOURCES","Score":null,"Total":0}

引用次数: 1

Abstract

Heavy metal wastewater often contains multiple metal ions, and competition among them reduces the adsorption efficiency of microalgae. Enhancing this efficiency is crucial for improving heavy metal removal. This study optimized lysine addition to facilitating the formation of a ternary complex between microalgae, lysine, and heavy metals, thereby enhancing adsorption in both single- and mixed-metal systems. In a single-metal system at 64 mg/L, lysine improved the removal rates of copper, zinc, and cadmium by 13.96%, 41.21%, and 33.26%, respectively. In binary systems (Cu-Zn, Cu-Cd, and Cu-Pb) at 32 mg/L, lysine increased copper adsorption by 11.81%, 15.71%, and 25.25%, while improving zinc, cadmium, and lead adsorption by 15.41%, 12.51%, and 3.93%, respectively. Competitive adsorption analysis revealed that lead most strongly inhibited copper adsorption, while copper significantly suppressed zinc adsorption. Mechanistic investigations using 3D-EEM, FTIR, and XPS demonstrated that humic substances in the extracellular polymeric substances (EPSs) of microalgae play a key role in lysine binding. This interaction increases the number of carboxyl functional groups on the cell surface, thereby enhancing the microalgae’s capacity to adsorb heavy metals.

查看原文本刊更多论文

添加赖氨酸增强斜四角肌对重金属的吸附：优化与竞争研究

重金属废水中往往含有多种金属离子，金属离子之间的竞争降低了微藻的吸附效率。提高这一效率对改善重金属的去除至关重要。本研究优化了赖氨酸的添加，促进了微藻、赖氨酸和重金属之间三元配合物的形成，从而增强了在单一和混合金属体系中的吸附。在64 mg/L的单金属体系中，赖氨酸对铜、锌和镉的去除率分别提高了13.96%、41.21%和33.26%。在32 mg/L Cu-Zn、Cu-Cd和Cu-Pb二元体系中，赖氨酸对铜的吸附分别提高了11.81%、15.71%和25.25%，对锌、镉和铅的吸附分别提高了15.41%、12.51%和3.93%。竞争吸附分析表明，铅对铜吸附的抑制作用最强，而铜对锌吸附的抑制作用最强。利用3D-EEM、FTIR和XPS进行的机制研究表明，微藻胞外聚合物（eps）中的腐殖质物质在赖氨酸结合中起关键作用。这种相互作用增加了细胞表面羧基官能团的数量，从而增强了微藻对重金属的吸附能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Water SA 环境科学-水资源

CiteScore

2.80

自引率

6.70%

发文量

审稿时长

18-36 weeks

期刊介绍： WaterSA publishes refereed, original work in all branches of water science, technology and engineering. This includes water resources development; the hydrological cycle; surface hydrology; geohydrology and hydrometeorology; limnology; salinisation; treatment and management of municipal and industrial water and wastewater; treatment and disposal of sewage sludge; environmental pollution control; water quality and treatment; aquaculture in terms of its impact on the water resource; agricultural water science; etc. Water SA is the WRC’s accredited scientific journal which contains original research articles and review articles on all aspects of water science, technology, engineering and policy. Water SA has been in publication since 1975 and includes articles from both local and international authors. The journal is issued quarterly (4 editions per year).