The decontamination of prometon (PMT) by ozone/hydroxylamine hydrochloride (O/HAC) was systematically investigated in this study with focus on the degradation mechanism and kinetics. Experimental results revealed that there was an enhancement of PMT degradation efficiency by 42.1% and the pseudo-first-order rate constant by more than 5.7 times in O/HAC process under low HAC dosage (5 mg L) after 3 min in comparison with O alone. The second-order rate constant of PMT with hydroxyl radical (OH) was determined to be (1.84 ± 0.1) × 10 M s and 7.80 × 10 M s via competition kinetics and OH steady-state hypothesis, respectively. The PMT removal in O/HAC process was highly pH-dependent and the optimum degradation performance was achieved under pH 5.0. In addition, OH and singlet oxygen were identified as the primary reactive oxygen radicals in O/HAC process. Meanwhile, eleven transformation products of PMT were identified and possible degradation mechanisms were proposed. Moreover, a kinetic model based on chemical kinetics and steady-state hypothesis was developed and modified to predict the PMT abatement in O/HAC process. The results demonstrated that the O/HAC process provided a promising alternative for refractory organic pollutants decontamination in water treatment.
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http://dx.doi.org/10.1016/j.jhazmat.2019.03.121 | DOI Listing |
Environ Sci Process Impacts
December 2024
College of Land Science and Technology, China Agricultural University, Beijing 100193, P. R. China.
Compost-derived dissolved organic matter (DOM) is a heterogeneous assemblage of different redox-active organic molecules. We hypothesize that DOM can interact with Cr(VI) and reduce it to Cr(III), thereby influencing the dynamics of Cr(VI) in soil and aquatic environments. Here, DOM, along with soil humic substances isolated from red soil and black soil, were fractionated into humic acid fractions (, HA, HA, and HA) and fulvic acid fractions (, FA, FA, and FA), respectively.
View Article and Find Full Text PDFSci Rep
September 2024
Department of Engineering, Faculty of Science & Engineering, Manchester Metropolitan University, Manchester, M1 5GD, UK.
Electrospinning is an outstanding manufacturing technique for producing nano-micro-scaled fibrous scaffolds comparable to biological tissues. However, the solvents used are normally hazardous for the health and the environment, which compromises the sustainability of the process and the industrial scaling. This novel study compares different machine learning models to predict how green solvents affect the morphology, topography and mechanical properties of gelatin-based scaffolds.
View Article and Find Full Text PDFBioresour Technol
July 2024
College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing 100083, China. Electronic address:
This study investigated the performance of combined nanobubble water (NW) and digestate in the soaking hydrolysis process. Two types of NW (CONW and ONW) with digestate were used to soak rice straw for 1, 2, 3, 5, and 7 days. During soaking process, the volatile fatty acids (VFA) concentration in the treatment with ONW and digestate for 3 days (ONW-3 d) reached 7179.
View Article and Find Full Text PDFNanomaterials (Basel)
April 2024
VINČA Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, 11351 Belgrade, Serbia.
Here, we present the results of the synthesis, surface modification, and properties analysis of magnetite-based nanoparticles, specifically CoFeO (S1) and CoFeO (S2). These nanoparticles were synthesized using the co-precipitation method at 80 °C for 2 h. They exhibit a single-phase nature and crystallize in a spinel-type structure (space group 3¯).
View Article and Find Full Text PDFNat Commun
March 2024
School of Materials Science and Engineering, Southeast University, Nanjing, 211189, P. R. China.
Ammonium ion batteries are promising for energy storage with the merits of low cost, inherent security, environmental friendliness, and excellent electrochemical properties. Unfortunately, the lack of anode materials restricts their development. Herein, we utilized density functional theory calculations to explore the VCT MXene as a promising anode with a low working potential.
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