In-situ synthesis of ZIF-8 on magnetic pineapple leaf biochar as an efficient and reusable adsorbent for methylene blue removal from wastewater

• Published in: Environmental science and pollution research international 2024-04, Vol.31 (16), p.24113-24128
• Main Authors: Ma, Xiaoxiao, Li, Yutong, Du, Yile, Chen, Shuangli, Bai, Yunfan, Li, Lin, Qi, Chuhua, Wu, Pingping, Zhang, Sijing
• Format: Article
• Language: English
• Subjects: Activated carbon; Adsorbents; Adsorption; Aquatic environment; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; biochar; carbonization; Charcoal; Color removal; cost effectiveness; desorption; Dyes; Earth and Environmental Science; Ecotoxicology; Electrostatic properties; Environment; Environmental Chemistry; Environmental Health; Functional groups; hydrogen; Hydrogen bonding; Industrial wastewater; kinetics; Leaves; magnetism; Methylene blue; Pineapples; Research Article; social welfare; sorption isotherms; thermodynamics; Waste Water Technology; wastewater; Wastewater treatment; Water Management; Water Pollution Control; Well being; Zeolites
• ISSN: 1614-7499; 0944-1344; 1614-7499
• DOI: 10.1007/s11356-024-32700-8

The presence of organic dyes in aquatic systems poses a significant threat to ecosystems and human well-being. Due to recycling challenges, traditional commercial activated carbon is not cost-effective. To address this, an imidazolate acid zeolite framework-8 (ZIF-8)-modified magnetic adsorbent (ZMPLB-800) was synthesized through the in-situ formation of ZIF-8 and subsequent carbonization at 800 °C, using magnetic pineapple leaf biochar (MPLB) as a carrier. The porous structure of ZMPLB-800 facilitates the rapid passage of dye molecules, enhancing adsorption performance. ZMPLB-800 exhibited remarkable adsorption capacity for methylene blue (MB) across a pH range of 3–13, with a maximum adsorption capacity of 455.98 mg g −1 . Adsorption kinetics and thermodynamics followed the pseudo-second-order kinetic model and Langmuir isotherm model. Mechanisms of MB adsorption included pore filling, hydrogen bonding, electrostatic interactions, π-π interactions, and complexation through surface functional groups. Additionally, ZMPLB-800 demonstrated excellent regeneration performance, recording a removal efficiency exceeding 87% even after five adsorption/desorption cycles. This study provides a novel strategy for treating dye wastewater with MOF composites, laying the foundation for waste biomass utilization. Graphical Abstract