Lei Yuan,Hongshuai Gao,Haiyan Jiang,Shaojuan Zeng,Tao Li,Baozeng Ren,Xiangping Zhang
A novel type of dual-functionalized pyridinium-based ionic liquids (ILs) with acidic protons and hydroxyl groups , were designed and synthesized for ammonia (NH 3 ) absorption. The NH 3 absorption isotherms in dual-functionalized pyridinium-based ILs at temperatures from 303.15 to 343.15 K and pressures up to 600 kPa were computed using gas-liquid equilibrium method. It revealed that 4-pyridinemethanol bis(trifluoromethane)sulfonamide [4-MeOHPy][NTf 2 ] showed the maximum NH 3 solubility of 3.43 mol NH 3 /mol IL at 313.15 K and atmospheric pressure, surpassing any nonmetallic ILs previously reported. Furthermore, the characteristics of isotherms under low pressures behaved an obvious chemical reaction between ILs and NH 3 , and all experimental solubilities were regulated by a reaction equilibrium thermodynamic model (RETM). The thermodynamic properties were further obtained to better understand the NH 3 absorption process. The results indicated that this model endorses the 1:1 (NH 3 -IL) mole ratio of chemical reaction mechanism and the reaction enthalpy is main driving force of NH 3 absorption in ILs.
A pyridine-based ionic porous organic polymer bearing hydroxyl groups (OH-iPOP) was developed for the first time by quaternization and crosslinking of 4-pyridinemethanol with 4,4′-bis(chloromethyl)biphenyl. OH-iPOP exhibited strong adsorption capacity for endocrine disruptors (EDs) including bisphenol A, bisphenol F, p-tert-butylphenol and bisphenol B (82.59–183.9 mg g −1 ), much higher than that of commercial adsorbents. The adsorption mechanism of OH-iPOP to EDs involved π-π ⁎ interaction, hydrogen bond and electrostatic interaction. Using OH-iPOP as solid phase extraction adsorbent combined with high-performance liquid chromatography, a reliable method for the sensitive detection of trace EDs in natural water and tilapia fish was established. The detection limits (S/N = 3) were 0.01–0.04 ng mL −1 and 1.00–3.80 ng g −1 for natural water and tilapia fish, respectively. The method recoveries ranged from 81.5 % to 116 %. This work not only develops an efficient adsorbent for the enrichment of EDs, but also provides a new strategy for the synthesis of novel cationic POPs.
危险品化学品经营许可证（带存储）