Department of Civil and Environmental Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Institute of Engineering Research, Seoul National University, Seoul, 08826, Republic of Korea.
Environ Sci Pollut Res Int. 2021 May;28(20):25390-25399. doi: 10.1007/s11356-021-12396-w. Epub 2021 Jan 17.
This study investigates the effect of chemical modification and growth medium on the surface characteristics and heavy metal adsorption capacities of Chlorella vulgaris biosorbents, which are prepared in a powder form for the ease of their transport and application. NaOH treatment partially lyses surface cells on cell aggregates, producing rough microscale structures on the biosorbent surface, which enhances the specific surface area by 19-fold and the heavy metal adsorption capacity by factors of 2.4-4.1. Autotrophic C. vulgaris incubation using nitrogen- and phosphorus-rich medium is even a more effective strategy for enhancing the adsorption capacity, showing factors of 1.6-9.4 increase compared to the use of a minimal medium. High phosphorus content of cell residues on the biosorbent surface obtained by luxury phosphorus uptake is responsible for the substantial enhancement. This study suggests a potential of utilizing nitrogen- and phosphorus-rich waste streams to produce a highly efficient microalgal biosorbent for heavy metal adsorption.
本研究考察了化学修饰和生长培养基对小球藻生物吸附剂表面特性和重金属吸附能力的影响，这些生物吸附剂被制备成粉末形式，以便于运输和应用。NaOH 处理部分裂解细胞聚集体表面的细胞，在生物吸附剂表面产生粗糙的微观结构，比表面积增加了 19 倍，重金属吸附能力提高了 2.4-4.1 倍。使用富氮和富磷培养基进行自养小球藻培养更是一种增强吸附能力的有效策略，与使用最小培养基相比，吸附能力提高了 1.6-9.4 倍。在生物吸附剂表面获得的细胞残留物中高磷含量是吸附能力大幅提高的原因。本研究表明，利用富氮和富磷废水生产高效微藻生物吸附剂用于重金属吸附具有潜力。
