Magnetic hydrochar derived from waste lignin for thallium removal from wastewater: Performance and mechanisms

作者：Wang, Huabin; Duan, Ran; Ding, Lin; Tian, Lin; Liu, Ying; Zhang, Yong; Xu, Rui^*

来源：Bioresource Technology, 2023, 374: 128736.

DOI：10.1016/j.biortech.2023.128736

• Thallium removal
• Pulping black liquor
• Waste lignin
• Adsorption mechanisms
• Wastewater purification

Waste lignin, such as black liquor (BL) from paper and pulping industries, is an agro-industrial biowaste while its reuse raised global concerns. In this work, a hydrothermal carbonization procedure was employed to convert BL into magnetic lignin-based hydrochar (MLHC) for thallium elimination from wastewater. The results exhibited water purification potential due to a wider working pH window (2-9) with the magnetization intensity of 11.12 emu/g. The maximum adsorption capacity for Tl(III) was 278.9 mg/g, while the contribution of various mechanisms was elucidated with the order: surface precipitation (31.3 %), complexation (20.6 %), physical adsorption (18.2 %), chemical reduction (15.0 %), and ion exchange (14.9 %). This study revealed that hy-drothermal treatment could be a potential and promising method to convert waste lignin into magnetic bio-adsorbent to recycle pulping black liquor and apply it for thallium pollution control.

• 单位
  南昌航空大学