Efficient Adsorption of Triazole Fungicides by Porous Organic Polymer Mpa-Tpa-Pops Material

Abstract

Triazole fungicides are widely used in agricultural production and possess strong environmental toxicity, necessitating their removal from water sources. Due to their notable characteristics, including high surface area and tunable porous structure, porous organic polymers (POPs) show promise as materials for adsorbing various fungicides from wastewater. Here, MPT-TPA-POPs were synthesized in green solvents using inexpensive diamines and dialdehyde monomers to form imine and aminal linkages. MPT-TPA-POPs were tested as an adsorbent for removing triazole fungicides from water under different conditions. It was found that MPT-TPA-POPs exhibited excellent adsorption capacity towards triazole fungicides. The optimal adsorption rates for FLU, PAC, TEB, and TRI were 57.82%, 86.55%, 91.95%, and 98.3%, respectively, with maximum adsorption capacities of 106.15 mg/g, 219.45 mg/g, 234.65 mg/g, and 233.9 mg/g. The adsorption process was found to be more in line with the pseudo-second-order kinetic model and Langmuir model. The reuse and cost analysis of the adsorbent indicates that after 6 cycles of adsorption-desorption, the reusability efficiency of the adsorbent material in simulated water samples remains above 89%. Characterization analyses including FTIR, SEM, EDS, BET, and XPS were conducted on MPT-TPA-POPs before and after the adsorption of triazole fungicides to examine changes in functional groups, morphology, elemental composition, surface area, and pore volume. The study results suggest that MPT-TPA-POPs can serve as a green, low-cost, and efficient adsorbent for removing triazole fungicides from water, providing a new approach for fungicide removal and adsorbent development.

Keywords: Porous organic polymers (POPs), Triazole fungicides, Adsorption, Adsorption isotherm, Kinetics