The utilization of a low-cost common waste biomass, mugwort, with a porous structure is important for the treatment of Arsenic (III) pollution in the aquatic environment. In this study, mugwort straw was first delignified to expose more hydroxyl groups, then loaded with MnOOH and α − FeOOH and constructed with p − n heterojunctions on cellulosic biochar microinterfaces. The successful formation of p − n heterojunction effectively enhances the electric field enhancement inside the photocatalyst, promotes charge transfer and suppresses the recombination of photogenerated carriers. Application of high-energy electron beam irradiation of FMBC−LR2 to modulate the generation and dominant mechanism of Fe and Mn in the reaction system. The results showed that Mn 3+ underwent disproportionation reaction to form Mn 2+ and Mn 4+ . Among them, Mn 2+ led to the formation of MnFe 2 O 4 , while Mn 4+ exhibited stronger oxidizing properties that could promote the transformation of Fe 2+ to Fe 3+ , thus allowing more Fe 3+ to participate in the photocatalytic oxidation of As(III) in a synergistic manner. As(III) oxidation efficiency increased 9.18 times after delignification treatment (FMBC−LR2) and 12.31 times after high-energy electron beam irradiation (FMBC−LR2 − 650) as compared to mugwort straw biochar (BC). In addition, the EPR assay results indicated that ·O 2 − , ·OH, and 1 O 2 acted together in the As(III) reaction. This provides new insights into the remediation of composite modified biochar in water bodies and a new environmentally friendly strategy for the comprehensive utilization of straw materials.
When mugwort is mechanically harvested, problems such as a low efficiency and high crushing rate seriously affect the quality of mugwort and restrict the development of the mugwort industry. In order to improve the efficiency of mugwort harvesting and reduce the crushing rate, the finite element method simulation and experiment are combined to study the optimal harvesting method of mugwort. Firstly, the parameters of the components of mugwort, such as the mugwort culm, mugwort stalk, and mugwort leaf, were investigated by tensile and three-point bending methods to determine the values of density, the modulus of elasticity, and Poisson’s ratio, and to establish the material mechanics model of mugwort. Secondly, harvesting of mugwort was simulated through the established three-dimensional model of mugwort, combined with its material mechanics model and using display dynamics. Finally, by conducting harvesting tests on mugwort, the harvesting force of different harvesting directions and harvesting positions were measured to reveal the harvesting mechanism of mugwort and to determine the optimal harvesting direction and position of mugwort leaves. The experimental results showed that the harvesting force was lowest when the harvesting angle was 0° or 90°, and the leaves were least damaged when the harvesting position was close to the stalk. The results of the study can provide data support for the study of the mechanical properties of mugwort and provide a theoretical basis for the research and development of high-efficiency and low-loss mugwort harvesting machinery and the optimisation of harvesting methods.
First, biocompatible temperature-responsive polymer chitosan- graft - N -isopropylacrylamide (CS- g -PNIPAm) synthesized via ATRP. Second, mugwort oil (MO) was encapsultated with CS- g -PNIPAm as shell materials to form long-term anti-bacterial agents and temperature responsive microcapsules. The CS- g -PNIPAm@MO (CSPN@MO) microcapsules were prepared via single coacervation method and solvent evaporation method. The chemical structures of CS 0.1 - g -PNIPAm 22 was confirmed by 1 H NMR and FTIR. And the copolymer micelles were characterized by UV, laser particle-size analysis, and TEM. The results indicated that the copolymer had temperature-responsive behaviors. The microcapsules were characterized by laser particle-size analyzers (LPSA), scanning electron microscopy (SEM), TG and anti-bacterial agents performance testing. The results showed that the average particle size of microcapsules was 0.28 μm, and the encapsulation efficiency and drug loading efficiency of MO reached 60.2 and 44.5%. After 48 h of release in media at different temperature (20, 40 and 60 °C) still sequestered 79.2, 92.2 and 96.1% of MO which approved the shell of microcapsules responded to different temperature. The morphology of CSPN@MO microcapsules revealed that the microcapsules presented smooth and firm structure. Antibacterial test for Artemisia argyi of CSPN@MO implied that the bacteriostatic rate reached 99.2 and 96.2% after 1 day and 10 days respectively. Bio-based macromolecular modification strategies can provide inspiration for the development of green microcapsules. Graphical Abstract
危险品化学品经营许可证（带存储）