Yongli Sun,Yanling Zhang,Luhong Zhang,Bin Jiang,Wenhao Gu,Huawei Yang
In this work, a kind of aqueous solution of novel protic triamine-based ionic liquid was proposed for efficient SO2 capture. The mixed absorbents were prepared by blending 1,1,4,7,7-pentaethyldiethylene (PEDETA) with sulfuric acid and water, and their physicochemical properties were studied by various methods. Remarkably, the viscosities of the mixed absorbents are in the range of 1.44–1.85 mPa s at 293.2 K, which is as low as water. Detailed SO2 absorption experiments were carried out to investigate the influence of some important factors, including temperature (298.2, 313.2, and 328.2 K), SO2 partial pressure (0–1 bar), and sulfuric acid proportion. It is worth noting that the mixed absorbents showed excellent absorption capacity, especially at a low partial pressure. All absorbed SO2 could be released easily and completely by the method of heating reflux. More importantly, the absorbent could be reused for at least 5 cycles without noticeable changes in both absorption performance and chemical structure. A thermogravimetric analysis further confirmed its good thermal stability. The detailed absorption mechanism was proposed and demonstrated by an infrared spectrum. In the end, the pKa values and reaction enthalpy of the protonation reaction of PEDETA were determined by acid titration and parameter analysis based on the reaction equilibrium model. In summary, the mixed absorbents, which possess low viscosities, good resistance to sulfuric acid, excellent capacity, and reusability, may have a good perspective in industrial SO2 capture.
Pharmaceuticals and personal care products (PPCPs) are widely used worldwide and cause potential soil pollution. Fe 2+ -activated persulfate (PS) processes (Fe-PAPs) are promising techniques for soil remediation. However, a knowledge gap exists in the mechanistic insights into the dominant factors affecting the degradation of different PPCPs in varied soil types. This study systematically investigated the roles of soil components and pollutant properties in the degradation of three PPCPs (triclosan (TCS), triclocarban (TCC), and naproxen (NPS)) in the nine soils in the Fe 2+ /PS system. The degradation efficiencies of TCS and NPS ranged from 10.92 % to 91.62 % and 46.59 % to 99.81 %, respectively, whereas nearly no degradation was observed for TCC. PPCPs with high water solubility, high energies of the highest occupied molecular orbital (E HOMO ), low p K a values, low energy gap (ΔE), or low vertical ionization potential (VIP) were more favorable for degradation. XPS analysis suggested that aliphatic carbon (Ali–C–C(H)), ether or alcohol carbon (C–O), and aldehyde or ketonic carbon (C O) on SOM significantly inhibited TCS degradation. The results of ROS quenching experiments showed that SO 4 •− and 1 O 2 played major roles in TCS and NPS degradation in the six soils, with the relative contributions ranged from 24.82 % to 99.14 % and 0.15 % to 73.40 %, respectively. The interaction between soil components, active species, and pollutants resulted in the distinct intermediates of TCS and NPS in different soils. Our findings provide in-depth insights into the role of soil composition and pollutant properties on the remediation of PPCP-contaminated soils in Fe-PAPs.
危险品化学品经营许可证（带存储）