Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
J Hazard Mater. 2022 Oct 5;439:129683. doi: 10.1016/j.jhazmat.2022.129683. Epub 2022 Jul 26.
The water pollution caused by heavy metals and dyes emitted by industries has become a worldwide problem. These pollutants are difficult to be biodegraded. Even at low concentrations, they are toxic and at last threaten human health. Herein, while using Tetrahymena thermophila, a single-celled ciliate protozoa, to enrich and remove the heavy metal Cd from water, CdS nanoparticle-Tetrahymena thermophila hybrid system (CdS-T. thermophila) for dye pollution remediation under light irradiation was developed. The conditions of Cd enrichment and removal by T. thermophila, construction of efficient CdS-T. thermophila, and decolorization of Congo red using CdS-T. thermophila were investigated. In the presence of cysteine ethyl ester, the removal rate of Cd by T. thermophila was 94% at low Cd concentration of 1 mg L. The adsorption capacity of T. thermophila to Cd reached 43 mg g at Cd concentration of 80 mg L. Using 0.1 g L constructed CdS-T. thermophila, the decolorization rate of 50 mg L Congo red solution reached 95% in 60 min under light irradiation. This study provides a new insight to effective removing Cd from water by T. thermophila to construct the CdS-T. thermophila and using it to remediate dye pollution in the environment.
工业排放的重金属和染料造成的水污染已成为全球性问题。这些污染物很难被生物降解。即使浓度很低，它们也是有毒的，最终会威胁到人类健康。在此，我们利用单细胞纤毛虫四膜虫来富集和去除水中的重金属 Cd，开发了在光照下可修复染料污染的 CdS 纳米颗粒-四膜虫杂交系统（CdS-T. thermophila）。我们研究了四膜虫对 Cd 的富集和去除条件、高效 CdS-T. thermophila 的构建以及利用 CdS-T. thermophila 对刚果红的脱色情况。在半胱氨酸乙酯的存在下，低浓度 1mg/L 的 Cd 时，四膜虫对 Cd 的去除率为 94%。当 Cd 浓度为 80mg/L 时，四膜虫对 Cd 的吸附容量达到 43mg/g。使用 0.1g/L 构建的 CdS-T. thermophila，在光照下，50mg/L 刚果红溶液的脱色率在 60min 内达到 95%。本研究为通过四膜虫有效去除水中的 Cd 构建 CdS-T. thermophila 并利用其修复环境中的染料污染提供了新的思路。
