Multifunctional β-Cyclodextrin MOF-Derived Porous Carbon as Efficient Herbicides Adsorbent and Potassium Fertilizer

Multifunctional material for simultaneous pollutants removal and nutrient release is a novel, economical, and sustainable strategy to reuse agricultural wastewater and improve crop growth. Herein, we synthesized a multifunctional porous carbon by using β-cyclodextrin MOF (β-CD MOF) both as precursor and potassium source. The obtained carbon material (β-CD MOF-NPC) was equipped with microporous structure, large surface areas, and rich potassium element content, as determined by comprehensive characterization results. The batch adsorption experiments indicated β-CD MOF-NPC possessed efficient adsorptive removal ability of four amide herbicides from water, which might be through π–π interaction, hydrogen bonding, and electrostatic interaction. Besides, the β-CD MOF-NPC could effectively contribute to the growth of rice seedlings cultured in herbicide-contaminated wastewater by simultaneous adsorption of herbicides and release of potassium ions in the pot experiments. This study indicated β-CD MOF-NPC integrated the function of adsorbent and fertilizer, which is a promising material for sustainable and economical agriculture.