Chengchen Jiang,Zehong Zeng,Liwen Jiang,Zhi Dang,Xiaohua Shu
Acesulfame potassium (ACE) is an emerging pollutant with the potential to induce a range of health hazards. In this study, waste natural pyrite (with some oxides on its surface) was washed and used as an activator to activate potassium peroxomonosulfate (PMS) to degrade ACE in water. The experimental results demonstrate that waste natural pyrite with an oxidized layer exhibited a significant degradation effect on ACE. Under conditions of 0.7 g/L pyrite and 60 μM PMS, a degradation rate of 99.3% for ACE was achieved within 15 min, and the mineralization rate reached 15.3% within 30 min. In addition, concerning its applicability, waste natural pyrite demonstrates strong activation ability within a pH range of 3 to 7. It is important to note that while HCO3−and Ca2+can influence the effectiveness, other common anions and cations do not significantly affect the degradation process. Mechanistic studies reveal that the primary active species in the waste natural pyrite/PMS system were sulfate radicals (SO4•−) as well as hydroxyl radicals (•OH), which contributed 50.6% and 36.9%, respectively. In addition, the analysis of ACE degradation products indicates that no highly toxic intermediates were generated during the degradation process. Overall, this study underscores the outstanding performance of waste natural pyrite as an activator, providing a safe, efficient, and cost-effective approach for degrading organic pollutants like ACE.
Xingjin Yang,Zheng Liu,Huanqi Chen,Qingge Feng,Dongbo Wang
Due to the strong polarity and difficult in biodegradation, acesulfame (ACE) and saccharin (SAC) are difficult to treat effectively in water environment. Herein, a series of ACE and SAC adsorption were investigated by the zinc-based MOFs (ZIF-8, MAF-6, MOF-5 and Zn-MOF-74) derived porous carbons (MPCs). The porous carbon derived from MOF-5 (MPCs-M5) and Zn-MOF-74 (MPCs-M74) of zinc-based carboxylate MOFs exhibited large surface area (2774.7 m 2 /g and 2447.3 m 2 /g), high mesoporosity (94.57% and 95.66%) and equipotential point value (7.85 and 9.82). The pseudo-second-order kinetic model and Freundlich adsorption model were fitted well to explore adsorption on the MPCs-M5 and MPCs-M74, respectively. Moreover, the MPCs-M5 and MPCs-M74 showed notable adsorption capacity of ACE (96.4 mg/g and 88.6 mg/g) and SAC (117.3 mg/g and 113.4 mg/g), respectively, which were the highest value than the previous reports. Furthermore, the excellent adsorption performance of MPCs-M5 and MPCs-M74 were also contributed by multi-faceted synergy of electrostatic, H-bond, and π-π interactions. Therefore, the above two samples of the hierarchical porous carbon prepared by self-activating zinc-based carboxylate MOFs with high oxygen content are recommended as efficient adsorbents for artificial sweeteners adsorption from water environment.
危险品化学品经营许可证（带存储）