Electronic properties and adsorption mechanism of hydrogen adsorbed onto Na-decorated graphene are investigated by using Density Functional Theory (DFT). The results show that hydrogen prefer to be adsorbed on Na-deco...
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作者：
Wang, QiqiFu, HaiweiDing, JijunYang, ChongWang, ShuaiCollege of Science
Xi'an Shiyou University Shaanxi Engineering Research Center of Oil and Gas Resource Optical Fiber Detection Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas Wells Xi'an710065 China
WO3 nanowires are prepared by hydrothermal method as coating material for tapered optical fiber ammonia sensor. The experimental results show that the sensor has obvious selective response to ammonia at room temperatu...
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Wavelength division multiplexing (WDM) technology as an extension of optical networks-on-chip (ONoCs) performance, can be applied to further overcome shortages of low bandwidth and high-power consumption in multiproce...
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We investigate the problem of time-of-arrival (TOA) based localization under possible non-line-of-sight (NLOS) propagation conditions. To robustify the squared-range-based location estimator, we follow the maximum cor...
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To improve the accuracy of the grasping detection, this paper proposes a novel detector with batch normalization masked evaluation model. It is designed with a two-layer sparse autoencoder, and a Batch Normalization b...
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ISBN:
(数字)9781728162126
ISBN:
(纸本)9781728162133
To improve the accuracy of the grasping detection, this paper proposes a novel detector with batch normalization masked evaluation model. It is designed with a two-layer sparse autoencoder, and a Batch Normalization based mask is incorporated into the second layer of the model to effectively reduce the features with weak correlation. The extracted features from such model are more distinctive, which guarantees the higher accuracy of the grasping detection. Extensive experiments show that the proposed evaluation model outperforms the state-of- the-art, and the recognition accuracy can reach 95.51% for robotic grasping detection.
The vital roles of synergetic carbon structure and iron species in periodate (PI)-based oxidation reaction remains unclear. In this study, multiple active species were identified as Fe(IV), 1 O 2 , •O 2 − , and IO 3 •...
The vital roles of synergetic carbon structure and iron species in periodate (PI)-based oxidation reaction remains unclear. In this study, multiple active species were identified as Fe(IV), 1 O 2 , •O 2 − , and IO 3 • in the magnetic ferrite-modified biochar (MFBC)/PI process. The MFBC/PI system maintained stable degradation efficiency under wide pH ranges and the presence of various interfering anions. A unique continuous cycle experiment verifies the contribution of iron leaching-precipitation equilibrium and redox equilibrium to the degradation efficiency of PI/MFBC system. Moreover, except carbonyl functional groups (C O) on biochar could activate PI, the interacted biochar-Fe provides an active site dispersion and fast electron transfer. The attack sites and degradation pathways on DDA were determined with DFT, P and S atoms on diphenylamine dithiophosphoric acid (DDA) were suggested to be the most active sites in MFBC/PI systems. Overall, this work investigated the mechanism of PI activation by the synergistic metal–carbon at the solid–liquid interface of heterogeneous catalysts, would provide a new perspective into the catalytic activation of PI by iron-carbon composites.
The use of biochars formed by hydrothermal carbonization for the treatment of contaminated water has been greatly limited, due to their poorly developed porosity and low content of surface functional groups. Also, the...
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The use of biochars formed by hydrothermal carbonization for the treatment of contaminated water has been greatly limited, due to their poorly developed porosity and low content of surface functional groups. Also, the most common modification routes inevitably require post-treatment processes, which are time-consuming and energy-wasting. Hence, the objective of this research was to produce a cost-effective biochar with improved performance for the treatment of heavy metal pollution through a facile one-step hydrothermal carbonization process coupled with ammonium phosphate, thiocarbamide, ammonium chloride or urea, without any posttreatment. The effects of various operational parameters, including type of modification reagent, time and temperature of hydrothermal treatment, and ratio of modification reagent to precursor during impregnation, on the copper ion adsorption were examined. The adsorption data fit the Langmuir adsorption isotherm model quite well. The maximum adsorption capacities （mg/g） of the biochars towards copper ions followed the order of 40-8h-1.0-APBC （95.24） 〉 140-Sh-O-BC （12.52） 〉 140-8h-1.0-TUBC （12.08） 〉 140-Sh-1.0-ACBC （7.440） 〉 140-Sh-1.0-URBC （5.277）. The results indicated that biochars modified with ammonium phosphate displayed excellent adsorption performance toward copper ions, which was 7.6-fold higher than that of the pristine biochar. EDX and FT-IR analyses before and after adsorption demonstrated that the main removal mechanism involved complexation between the phosphate groups on the surface of the modified biochars and copper ions.
Catalyst-free visible light assisted Fenton-like catalysis offers opportunities to achieve the sustainable water decontamination, but the synergistic decontamination mechanisms are still unclear, especially the effect...
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Catalyst-free visible light assisted Fenton-like catalysis offers opportunities to achieve the sustainable water decontamination, but the synergistic decontamination mechanisms are still unclear, especially the effect of proton transfer process (PTP). The conversion of peroxymonosulfate (PMS) in photosensitive dye-enriched system was detailed. The photo-electron transfer between excited dye and PMS triggered the efficient activation of PMS and enhanced the production of reactive species. Photochemistry behavior analysis and DFT calculations revealed that PTP was the crucial factor to determine the decontamination performance, leading to the transformation of dye molecules. The excitation process inducing activation of whole system was composed of low energy excitations, and the electrons and holes were almost contributed by LUMO and HOMO. This work provided new ideas for the design of catalyst-free sustainable system for efficient decontamination.
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