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<p>The CO<sub>2</sub> absorption–microalgae conversion (CAMC) system is a promising technology platform for simultaneous carbon capture and bioproduct generation. This work introduces potassium argininate (ArgK), an amino acid salt with dual functionality, as a novel component to enhance the performance of this CAMC system using <i>Chlorella</i> sp. L166. The ArgK-enhanced process significantly improved system performance, achieving a sevenfold increase in biomass carbon accumulation rate. The final biomass concentration also increased by 396.25% compared with the control. Furthermore, the technology effectively upgraded captured carbon into key biomolecules, boosting protein content by 331.73% to 512.79&#xa0;mg/L and elevating carbohydrate content to 97.57&#xa0;mg/L. This performance significantly surpassed that of conventional K<sub>2</sub>CO<sub>3</sub>-based systems, which resulted in limited protein accumulation. These findings demonstrate the dual role of ArgK as an efficient CO<sub>2</sub> absorbent and biochemical modulator, offering a promising pathway to improve both biomass carbon accumulation efficiency and the economic value of algal biomass. This strategy supports the development of biocompatible, high-performance CAMC system for carbon mitigation and bioresource valorization.</p>

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Dual-functional potassium argininate for sustainable CO2 capture and microalgal resource recovery

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Yizhen Wei,
  • Yaoqi Hou,
  • Dantong Wang,
  • Zhan Hu,
  • Chunfeng Song

摘要

The CO2 absorption–microalgae conversion (CAMC) system is a promising technology platform for simultaneous carbon capture and bioproduct generation. This work introduces potassium argininate (ArgK), an amino acid salt with dual functionality, as a novel component to enhance the performance of this CAMC system using Chlorella sp. L166. The ArgK-enhanced process significantly improved system performance, achieving a sevenfold increase in biomass carbon accumulation rate. The final biomass concentration also increased by 396.25% compared with the control. Furthermore, the technology effectively upgraded captured carbon into key biomolecules, boosting protein content by 331.73% to 512.79 mg/L and elevating carbohydrate content to 97.57 mg/L. This performance significantly surpassed that of conventional K2CO3-based systems, which resulted in limited protein accumulation. These findings demonstrate the dual role of ArgK as an efficient CO2 absorbent and biochemical modulator, offering a promising pathway to improve both biomass carbon accumulation efficiency and the economic value of algal biomass. This strategy supports the development of biocompatible, high-performance CAMC system for carbon mitigation and bioresource valorization.