Green synthesis of o-hydroxyazobenzene porous organic polymer for efficient adsorption of aromatic compounds

Porous Organic Polymer Synthesized by Green Diazo-Coupling Reaction for Adsorptive Removal of Methylene Blue

“…The pore size layout curve (inset in Figure b) clearly validates its mesoporous structure. The Brunauer–Emmett–Teller (BET) specific surface area of DT-POP is slightly smaller than a reported value (133.87 vs 192.93 m 2 ·g –1 ) . However, the Barrett–Joyner–Halenda (BJH) adsorption cumulative volume is slightly larger than a reported value (0.51 vs 0.41 cm 3 ·g).…”

“…The peak at 1588 cm –1 corresponds to CC . The peak at 1476 cm –1 is caused by the asymmetric vibrating of NN, indicating that the coupling reaction occurred and the framework structure of DT-POP was formed . After adsorption of MB, the adsorption bands at 1595, 1388, and 1328 cm –1 stand, respectively, for the stretching vibrations of CN, C–N, and the −CH 3 symmetric deformation from MB which also appears .…”

“…The FT-IR spectra of DT-POP with and without adsorption of MB are displayed in Figure a. The wide adsorption band at 3426 cm –1 comes from −OH stretching vibration. , The peaks at 1295 and 1672 cm –1 stand for the stretching vibrations of C–N and CO, respectively . The peak at 1588 cm –1 corresponds to CC .…”

“…Porous organic polymers (POPs), a novel type of porous substances built from organic monomers via polycondensation reaction to form covalent bonds, have attracted wide attention in the fields of gas storage, adsorption, and catalysis thanks to their low density, variable structures, high porosity, large specific surface areas, and excellent physicochemical stability. − Recently, POPs have become promising candidates for wastewater treatment. − For example, Liu et al synthesized through polycondensation two nitrogen-rich POPs for highly efficient adsorption of iodine. Most POPs are synthesized by condensation reactions, such as the Schiff base formation under organic solvents and high-temperature conditions. − The diazo-coupling reaction is mild in aqueous solutions for the synthesis of POPs by the use of different monomers, such as tri/diamines and tri/diphenols. − For example, Das and co-workers prepared a novel POP based on the diazo-coupling reaction of 2,6,14-triaminotriptycene with 1,4-dihydroxybenzene, and the POP can adsorb cationic MB with the capacity of 250 mg·g –1 . However, the use of POP-based adsorbents to treat wastewater is still in its infancy.…”

Analytical methods to analyze pesticides and herbicides

“…This method possessed high reproducibility and sensitivity with low LODs (0.05-0.5 ng/L). Song, Zhang, et al (2019) synthesized o-hydroxyazobenzene porous organic polymer (HAzo-POP) which was stable with a great capacity of absorbing aromatic compounds. This polymer was successfully used for SPE to extract phenylurea herbicides from real samples followed by HPLC-UV analysis.…”