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19. The effect of crystal structure of MnO2 electrode on DMAC removal: degradation performance, mechanism, and application evaluation.

Author

Hu, Liyong, Zhou, Wu, Liu, Minghao, Xia, Guanghua, Chen, Jun, and Yao, Jiachao

Subjects
DEMETHYLATION, CRYSTAL structure, ELECTRODE potential, ELECTRODE performance, ELECTROCHEMICAL electrodes, ELECTRODES, ELECTROLYTIC oxidation
Abstract

The crystal structure has a significant impact on the electrochemical properties of electrode material, and thus influences the electrocatalytic activity of the electrode. In this work, α-, β-, and γ-MnO2 electrodes were fabricated and applied for investigating the effect of crystal structure on electro-oxidation treatment of N,N-dimethylacetamide (DMAC) containing wastewater. The prepared MnO2 electrodes were characterized by scanning electron microscopy and X-ray diffraction, suggesting that different crystal structures of MnO2 electrodes with the same morphology of stacking-needle structure were successfully prepared. The electrochemical performances, including removal efficiencies of DMAC, chemical oxygen demand (COD) and total nitrogen (TN), and energy consumption, were compared between different MnO2 electrodes. Results indicated that β-MnO2 electrode presented the excellent electrochemical activity, and could remove 93% DMAC, 62% COD, and 78.9% TN, which was much higher than that of α- and γ-MnO2; moreover, energy consumptions of 11.3, 9.7, and 10.5 kWh/m3 were calculated for α-, β-, and γ-MnO2, respectively. Additionally, the oxidation mechanism of the MnO2 electrodes was presented, indicating that DMAC was mainly oxidized by hydroxyl radical through reactions of hydroxylation, demethylation, and deamination, and electrode characteristics of specific surface area, oxygen evolution potential, and hydroxyl radical production were the key factors for degrading DMAC on MnO2 electrodes. Finally, an actual DMAC containing wastewater was applied for testing the electrochemical performance of the three electrodes, and β-MnO2 electrode was verified as the suitable electrode for potential application which achieved removal efficiencies of 100%, 64.5%, and 73% for DMAC, COD, and TN, respectively, after system optimization. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Study on screening of canola varieties with high light use efficiency and evaluation of selecting indices

Author

Wang Rui, Peng Wenli, Hu Liyong, and Wu Weixian

Subjects
canola, high light use efficiency, principal component analysis, subordinate function, comprehensive evaluation, Oils, fats, and waxes, TP670-699
Abstract

High light use efficiency is an important factor for yield improvement during the growing season for winter canola. This study explored the evaluation method of high light use efficiency during the whole growth period in order to screen high light use coefficient of crop genotypes in canola producing areas of Southwest China. The pot experiment was conducted with sixty canola cultivars which had already been planted in the crops planting areas of the middle and upper reaches of Yangtze River. The plant height, root neck diameter, number of pods per main inflorescence, pods per plant, dry weight of shoots, seed weight per plant, pericarp weight per plant, ratio of pericarps to seeds weight per plant, seeds number per pod and 1000-grain weight were investigated under the shading treatment of reducing the incoming solar light by 20%. The high light use coefficient of canola cultivars was evaluated comprehensively by principal component analysis, membership function, cluster analysis and stepwise regression analysis. With these analyses, the original twelve indices related to light use efficiency could be synthesized into the four independent indices which represented 86.4% of all the investigated information of canola with high photosynthetic efficiency. Sixty varieties were classified into three groups by cluster analysis, and ZS12, GYZ6, FY792, RHY6, CZY3 and ZYZ19 displayed higher light use efficiency; such 18 varieties as XDZY9, XY1, YY50 and so on, were medium light efficient ones; and the rest 36 varieties such as LY9, ZYZ781, SG127 and so on, fell to the relatively lower light use efficiency categories. The comprehensive evaluation in this study had screened such four indicators as the stem dry weight per plant, the pod number per plant, the seed number per pod and the 1000-seed weight, which could be regarded as identification indicators for high light use efficiency of canola.

Published
2020
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49. Estimation of Base Temperature for Germination of Rapeseed (Brassica napus) using Different Models

Author

Hu LiYong, M. N. Khan, Xu ZhengHua, Xian MengZhu, and Luo Tao

Subjects
0106 biological sciences, 0301 basic medicine, chemistry.chemical_classification, Rapeseed, Base (chemistry), Cold tolerance, Brassica, Biology, biology.organism_classification, 01 natural sciences, Fight-or-flight response, 03 medical and health sciences, Horticulture, 030104 developmental biology, chemistry, Germination, Cultivar, General Agricultural and Biological Sciences, Cold stress, 010606 plant biology & botany
Published
2018

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