The rapid and efficient degradation of polycyclic aromatic hydrocarbon (PAH) derivatives with toxicological properties remains a substantial challenge. In this study, a cost-effective and eco-friendly catalyst, nano-M...
详细信息
The rapid and efficient degradation of polycyclic aromatic hydrocarbon (PAH) derivatives with toxicological properties remains a substantial challenge. In this study, a cost-effective and eco-friendly catalyst, nano-MoO2 (0.05 g L-1), exhibited excellent performance in activating 4.0 mmol L-1 peroxymonosulfate (PMS) for the degradation of naphthalene derivatives with 1 mg L-1 in aqueous systems;these derivatives include 1-methylnaphthalene, 1-nitronaphthalene, 1-chloronaphthalene, 1-naphthylamine and 1-naphthol, with high degradation rates of 87.52%, 86.23%, 97.87%, 99.74%, and 77.16%. Nano-MoO2 acts as an electron donor by transferring an electron causing O-O bond of PMS to cleave producing SO4 center dot-, and later (OH)-O-center dot. Electron paramagnetic resonance (EPR) analysis combined with free radical quenching research indicated that SO4 center dot- and (OH)-O-center dot dominated the degradation of naphthalene derivatives, and O-2(center dot-) and O-1(2) participated in the processes. X-ray photoelectron spectroscopy (XPS) revealed the transformation of Mo(IV) to Mo(V) and Mo(VI), which suggested that the activation process proceeded via electron transfer from nano-MoO2 to PMS. The applicability of the nano-MoO2/PMS system in influencing parameters and stability was explored. The degradation pathways were primarily elucidated for each naphthalene derivative based on the intermediates identified in the systems. The -CH3, -NO2, -Cl, -OH substituents increased the positive electrostatic potential (ESP) on the molecular surface of 1-methylnaphthalene, 1-nitronaphthalene, 1-chloronaphthalene, and 1-naphthol, which reduced the electrophilic reaction and electron transfer between the reactive species and pollutants, leading to a lower degradation rate of naphthalene derivatives than the parent compound. However, the effect of -NH2 substituents is the opposite. These findings suggest that nano-MoO2 may aid as a novel catalyst in the future remediation of environme
We study the three dimensional many-particle quantum dynamics in mean-field setting. We forge together the hierarchy method and the modulated energy method. We prove rigorously that the compressible Euler equation is ...
详细信息
Optimal manure treatment aimed at usage as agricultural soil fertilizers is a prerequisite ecological pollution control strategy. In this work, livestock manure-based fertilizers were collected from 71 animal farms ac...
详细信息
Optimal manure treatment aimed at usage as agricultural soil fertilizers is a prerequisite ecological pollution control strategy. In this work, livestock manure-based fertilizers were collected from 71 animal farms across 14 provinces in China. The contamination levels and potential ecotoxicological risks of residual steroid estrogens (SEs): estrone (E1), estriol (E3), 17 & alpha;-estradiol (17 & alpha;-E2), 1713-estradiol (1713-E2) and xenoestrogen (XE) bisphenol A (BPA), were investigated. The results showed that the occurrence frequencies for SEs and XE ranged from 66.67% to 100%, and the mean concentration varied considerably across the study locations. The total content of SEs and XE in Hebei province was the highest, and swine manure-based fertilizers concentrations were higher than the levels reported in other animal fertilizers. Compared with farm level manure, manure-based fertilizers are processed by composting, and the micropollutants quantities are significantly reduced (mean: 87.65 - 534.02 & mu;g/kg). The total estradiol equivalent quantity (EEQ) that might migrate to the soil was estimated to be 1.23 & mu;g/kg. Based on the estimated application rate of manure, 38% of the fertilizers risk quotients exceeded 0.1, indicating medium to high risks pressure on terrestrial organisms. Nonetheless, the estrogenic risk was lower in manure-based fertilizers than in manure. This study highlights the significance of proper treatment of livestock manure and designing an optimal manure fertilization strategy to mitigate the risks posed by SEs and XEs to the agroecosystems.
We consider the T4 cubic NLS which is energy-critical. We study the unconditional uniqueness of solutions to the NLS via the cubic Gross-Pitaevskii hierarchy, an uncommon method, which does not require the existence o...
详细信息
Developing efficient passivating sorption materials for the treatment of combined pollution by phthalate esters (PAEs) and Cd2+ has become a critical focus in environmental protection and soil remediation. In this stu...
详细信息
暂无评论