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Current Issue
2021 Vol.38 Issue.3,
Published 2021-05-15
0
2021 Vol. 38 (3): 0-0 [
Abstract
] (
447
) [
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1KB] [
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716KB] (
1627
)
1
Preparation and Photoelectrocatalytic Performance of CQDs Modified Bi
2
MoO
6
Hybrid Electrode
Zhao Chenxiao, Zhang Zisheng, Gao Xin, Li Hong
In order to improve the visible light absorption and the photogenerated charges migration ability of Bi
2
MoO
6
electrode, and to further enhance its catalytic degradation of organics in waste water, the carbon quantum dots were modified on the surface of Bi
2
MoO
6
electrode through solvothermal, calcination and adsorption processes and the hybrid electrode was applied to the photoelectrocatalytic system. The effects of CQDs modification and photoelectrocatalytic bias on improving the catalytic performance of Bi
2
MoO
6
were explored through various characterizations and tests. The results show that CQDs are evenly dispersed on the surface of Bi
2
MoO
6
, and the connection between two materials are successfully formed. The CQDs/Bi
2
MoO
6
hybrid electrode has stronger capacity of visible light utilization and surface charges migration than the Bi
2
MoO
6
monomer electrode. Therefore, the 15-CQDs/Bi
2
MoO
6
hybrid electrode shows the highest photoelectrocatalytic degradation rate of 82.7% toward methylene blue within 2 h under visible light, which is greatly enhanced compared to 16.0% for Bi
2
MoO
6
electrode. Besides, the hybrid also possesses a better cycle stability.
Guide:
2021 Vol. 38 (3): 1-9 [
Abstract
] (
328
) [
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1KB] [
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12262KB] (
828
)
10
J-Type Aggregates of a Uracil-functionalized Aza-BODIPY Dye Directed by Hydrogen Bonding
Jing Lei, Zhang Yongjie, Ren XiangKui, Chen Zhijian
J-aggregates of functional dyes represent a class of important supramolecular material that have been applied widely in various fields. A novel boron-azadipyrromethene (aza-BODIPY) dye
1
appended with uracil groups on 2,6-positions was synthesized, which could self-assemble into nanofibrous J-aggregates in methylcyclohexane driven by intermolecular double hydrogen bonds. The maximum absorption wavelength of the J-aggregates of dye
1
located at 768 nm, which was bathochromically shifted for 47 nm compared with that of the monomers. Temperature/concentration-dependent UV/Vis spectroscopy demonstrated that the formation of J-aggregates of dye
1
followed the cooperative self-assembly mechanism. The morphology and molecular packing structure of J-aggregates were studied by transmission electron microscopy and exciton theory calculation.
Guide:
2021 Vol. 38 (3): 10-19 [
Abstract
] (
387
) [
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1KB] [
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6556KB] (
1628
)
20
Atomic Layer Deposition of Zinc Oxide on Carbon Nanotube Fabrics for Photocatalysis
Feng Jianhua, Wang Ying, Shu Zhihao, Wu Minghui
The functionalized fabrics were fabricated using diethyl zinc and deionized water as precursors to deposit ZnO onto self-supporting carbon nanotube (CNT) fabrics by atomic layer deposition(ALD). The microstructure morphologies, crystal structure, surface properties and photocatalytic activities of the fabrics were investigated during ALD. ZnO grows on the CNTs surface as nanoparticulates initially and then forms conformal layers wrapping the CNTs with rising ALD cycles. The oxide loadings in CNT fabrics can be precisely regulated by changing ALD deposition conditions. The originally hydrophobic surface of fabrics is progressively turned to be highly hydrophilic. The combination of CNTs and hexagonal wurtzite ZnO could effectively enhance the electron transfer ability and significantly reduce the recombination probability of photo-generated electrons and holes. The ALD-modified CNT fabric exhibits excellent photocatalytic degradation performance, demonstrating that ALD is an efficient and flexible method for the functional modification of CNT fabrics.
Guide:
2021 Vol. 38 (3): 20-27 [
Abstract
] (
335
) [
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1KB] [
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4479KB] (
1102
)
28
Research Advances on Application of Polymer in Carbon Dots
Wang Yang, Feng Yakai
With special nano-structures and excellent fluorescence properties, Carbon Dots(CDs) have continuously attracted public attention and have been applied in the fields of photoelectric devices and bioimaging. In order to control CDs structure and fluorescence properties, different polymers have been applied into the CDs synthesis process. In this paper, the applications of polymers as precursors to synthesize CDs and as modifiers to tune CDs photoluminescence properties were introduced, and this paper focused on the research advances of how polymers regulated CDs’ fluorescence emission wavelength, fluorescence quantum yield and fluorescence lifetime. Finally, the research directions of polymer’s application in CDs materials were prospected.
Guide:
2021 Vol. 38 (3): 28-35 [
Abstract
] (
261
) [
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1164KB] (
1585
)
36
Heat Transfer Performance and Pressure Drop of a Gas-solid Circulating Fluidized Bed Heat Exchanger
Jiang Feng, Han Nisha, Qi Guopeng, Wang Jinjin, Li Xiulun
A gas-solid circulating fluidized bed heat-exchange apparatus is designed and built to enhance heat transfer by combining the fluidized bed heat transfer and fouling prevention technology with gas-phase heat-exchange process. Air and glass bead particles are selected as the working media. The effect of operating parameters, such as the amount of added particles, air flow rate and heat flux, on the heat transfer performance and pressure drop are investigated by using resistance temperature detectors and differential pressure transmitter. Results show that the addition of the glass beads can significantly enhance heat transfer. The heat transfer enhancement factor reaches 33.4% at
ε
=1.5%,
V
g
=19.78 m
3
·h
-1
and
q
=1 kW·m
-2
, and the corresponding pressure drop ratio does not exceed 2.4%. The heat transfer enhancing factor fluctuates with the increase in the amount of added particles and air flow rate. At low air flow rate, the enhancing factor increases with the increase in heat flux. With the increase in air flow rate, the effects of heat flux on the enhancing factor decreases. With the increase in the amount of added particles, the pressure drop ratio fluctuates at low air flow rate, but increases at high air flow rate. The pressure drop ratio fluctuates with the increase in air flow rate, depending on the amount of added particles and heat flux. Heat flux has a little effect on the pressure drop ratio. The three-dimensional diagrams are established to show the effect of the operating parameters on the heat transfer performance and pressure drop. These findings are beneficial to the industrial application of the fluidized bed heat transfer and fouling prevention technology in the gas-phase heat-exchange process.
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2021 Vol. 38 (3): 36-48 [
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] (
287
) [
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6408KB] (
1542
)
49
Study on the Strengthening Technology of Salt Solarization
Huang Qunwu, Tian Zuoxu, Wang Yiping
Based on the efficient solar steam generation technology, the activated carbon filter cotton, sponge, scouring cloth and sintered stainless steel were used to form different two-layer combinations and optimized to promote the generation of steam. The experimental results show that under the light intensity of 1 000 W·m
-2
, the double-layer combination of activated carbon filter cotton and sponge can promote the evaporation of water more efficiently. The height of the light-to-heat conversion layer from the water surface is about 4 mm, when only one layer is laid (thickness is 3 mm), there is a better evaporation effect; in the presence of salt accumulation, there is still an efficient water evaporation rate within 10 hours; after 10 cycles of experiments, the double-layer structure still ensures good evaporation effect. The two low-cost materials selected in this paper can promote the conversion of water vapor produced by solar light and heat. The water evaporation rate is 1.2 kg·m
-2
·h
-1
, and the thermal efficiency is 78%, which works well. The work of this article provides a new way for efficient salt solarization.
Guide:
2021 Vol. 38 (3): 49-56 [
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] (
395
) [
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7127KB] (
968
)
57
Plugging Property and Oil Displacement Performance of Nanoscale Polymer Microspheres
Li Xiang, Qu Jin, Ju Ye, Tang Zhongli, Wang Shuo, Qi Peiyao, Liu Fenggang, Liu Xiaofei
Nanoscale polymer microspheres have received more attention because of their good resistance to water, temperature, salinity, and lower operating costs. As a new flooding technology, polymer nanospheres can significantly improve the efficiency of oil field production. In order to better understand the flooding effect of polymer nanospheres, the plugging and flooding of polymer nanospheres were studied. In this paper, the micro-channel displacement experiment and the filter membrane experiment were carried out. The size changes of the microspheres after swelling were analyzed by the laser particle size analyzer, the microsphere emulsion was observed by transmission electron microscope, and the surface tension of the microsphere emulsion and dry powder in the air was studied. The results showed that in the microchannel experiments of 50 nm and 100 nm microspheres, micro-level agglomerates were observed, which enlarged the swept volume of the water dispersion system. Both nanoscale polymer microspheres exhibited a certain degree of agglomeration behavior. Swelling performance, entanglement between microspheres, emulsifiers and oil droplets was also found. The surfactant contained in the microsphere emulsion reduces the surface tension, thereby improving the oil displacement efficiency. In this paper, the plugging performance and oil displacement performance of nanoscale polymer microspheres are studied, which has significant reference for revealing the oil displacement mechanism of nanoscale polymer microspheres and the sustainable development and innovation of products.
Guide:
2021 Vol. 38 (3): 57-63 [
Abstract
] (
326
) [
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1KB] [
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3683KB] (
1334
)
64
Determination and Correlation of Solid-liquid Equilibrium of Ternary System KH
2
PO
4
-CO(NH
2
)
2
-H
2
O at 283.15 K
Huang Linchuan, Li Tianxiang, Yang Jiamin, Wang Xiaoli, Ou Jian, Zhu Jing
The solid-liquid phase equilibrium of KH
2
PO
4
-CO(NH
2
)
2
-H
2
O at 283.15 K was studied by isothermal dissolution equilibrium method. The corresponding stable phase diagram was drawn according to the experimental results, and the composition and structure of the equilibrium solid phase were identified by wet slag method and X-ray diffraction method. The results show that there are a invariant point, two univariate curves and three crystalline regions in the phase diagram, and the system is a simple co-saturation type, no double salts or adducts were formed. Wilson equation and NRTL equation were used to calculate the solubility of ternary KH
2
PO
4
-CO(NH
2
)
2
-H
2
O, and the calculated values were in good agreement with the experimental values. The relative average deviation (RAD) and root mean square deviation (RMSD) of the calculated values of Wilson equation and experimental values are 0.575% and 0.159%, respectively; the RAD and RMSD of the calculated of NRTL equation and experimental values are 1.58% and 0.136%, respectively.
Guide:
2021 Vol. 38 (3): 64-69 [
Abstract
] (
408
) [
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1KB] [
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2154KB] (
1515
)
70
Lithium Storage Properties of Hierarchical MoS
2
/C Composite Materials
Yang Zichuan, Xiang Jianan, Wang Xiaxia, Tian Jianhua, Shan Zhongqiang
Flower-like MoS
2
/C composite materials were prepared by one-pot ethanol/water composite solvothermal and postsintering method using MoS
2
and glucose as raw materials. The reasonable composition of the ethanol/water composite solvent and the reasonable carbon content in the MoS
2
/C composite material were investigated. The morphology of MoS
2
/C samples were characterized using SEM and TEM. The carbon content of MoS
2
/C materials was tested and calculated using TGA. The electrochemical properties of the MoS
2
/C electrodes were investigated by cyclic voltammetry, galvanostatic charge-discharge measurements and electrochemical impedance spectroscopy. The result indicated that MoS
2
/C composite materials exhibits hierarchical flower-like structure, which eases the agglomeration of MoS
2
and increases the utilization and electrochemical stability of the electrode active materials. When
V
ethanol
：
V
water
=1：2 and the carbon content is 50%,the MoS
2
/C electrode delivers a reversible capacity of 762 mA·h·g
-1
at a current density of 200 mA·g
-1
after 100 cycles.
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2021 Vol. 38 (3): 70-77 [
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308
) [
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1KB] [
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15933KB] (
798
)
78
Effect of Ammonia on Properties of Flue Gas Dust From Plate Display Substrate Glass Furnace
Xu Gang, Wan Dong, Pan Jie
In this work, by a de-NO
x
and dust removal device, the effects of ammonia on temperature of dust deposition, water content of dust, and properties of flue gas dust were investigated. The results showed that, with the increase of the concentration of ammonia, the temperature of dust deposition increased obviously, at the same time, the water content of dust increased too, the average water content in the dust is in the range of 7%~8%. Based on results of SEM and granularity distribution, when the concentration of ammonia reached 710 mg·Nm
-3
in flue gas, the boron oxide ammonia hydrate was found in the dust, particle accumulation occurred, and average size of particle increased, which was helpful for the removal of dusts.
Guide:
2021 Vol. 38 (3): 78-83 [
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330
) [
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2973KB] (
1020
)
84
Quantum Chemistry Calculation on the Mechanism of Benzylamine Denitrogenation in Supercritical Water
Lu Qianwen, He Fan, Li Yonghong, Miao Zhenyu, Sun Hongwei
The denitrogenation mechanism of benzylamine in supercritical water was studied by experiment and quantum chemistry calculation. The quantum chemistry calculation was performed by Gaussian09 software package at M06/6-311G(d,p) and M06-2X/6-311+G(d,p) levels. Results show that the denitrogenation process of benzylamine is conform to concerted reaction mechanism instead of the free radical one. Two-step dehydrogenation, which is first presented, is the main dehydrogenation reaction of benzylamine. The energy barrier of this two-step dehydrogenation reaction is 181.4 kJ·mol
-1
, which is 118.7 kJ·mol
-1
lower than that of traditional one step dehydrogenation reaction. Benzaldehyde derived from the dehydrogenation reaction was reacted with benzylamine, and generating benzylidenebenzylamine (BBA). The degradation process was continued through the reaction of BBA with supercritical water. Besides, the supercritical water molecules have a significant catalytic effect on the denitrogenation process of benzylamine, as shown by comparing the energy barrier of the reactions with and without water catalyst.
Guide:
2021 Vol. 38 (3): 84-94 [
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266
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4899KB] (
1200
)
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