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Current Issue
2021 Vol.38 Issue.2,
Published 2021-03-15
0
2021 Vol. 38 (2): 0-0 [
Abstract
] (
1134
) [
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1KB] [
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729KB] (
2958
)
1
Structure and Properties of the Poly(lactic acid)/Polyamide-11/Poly(epichlorohydrin-co-ethylene oxide)Elastomer Ternary Blends
Jiang Hai, Ding Yingli, Huang Dong, Liu Juyang, Pan Li, Zhang Kunyu
In present work, fully renewable ternary blends were prepared from poly(lactic acid), bio-based polyamide 11 and poly(epichlorohydrin-co-ethylene oxide) elastomer via a melt blending method. Miscibility, phase behavior, thermal and mechanical properties of the ternary blend were thoroughly studied. Addition of the PA11 effectively improved the miscibility, thermal resistance, and toughness of the blends. PA11 continuous phases greatly increased the Vicat softening temperature of PLA above 160℃. Mechanical tests proved that 42.5%(mass fraction) content of PA11 could significantly improve the tensile toughness of the blend:the elongation at break of PLA/PA11/ECO(42.5/42.5/15) reached 295%. The impact strength of PLA/PA11/ECO(60/25/15) blend with only 25% PA11 increases to 47.4 kJ/m
2
. A small amount of PA11 and ECO elastomer with high interfacial adhesions played a good synergistic effect on toughening PLA. Our research demonstrated that the PLA/PA11/ECO multi-component blending system is a simple and efficient method to gain high performance bio-based materials.
2021 Vol. 38 (2): 1-8 [
Abstract
] (
1158
) [
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11223KB] (
935
)
9
Activation Peroxymonosulfate by CoCo-PBA@CuFe-LDH for the Degradation of Atrazine
Ma Xiao, Wang Yan, Li Guobing, Cai Wangfeng
In order to effectively degrade atrazine (ATZ) in wastewater, CoCo-PBA@CuFe-LDH composite was prepared by using co-precipitation method to load cobalt-based Prussian blue analogue (CoCo-PBA) on the layered double hydroxides CuFe-LDH, which was used to activate peroxymonosulfate (PMS) for ATZ degradation. Investigating of the main influencing factors of the degradation process revealed that increase of CoCo-PBA@CuFe-LDH dosage and temperature were all favorable to ATZ degradation; excessive dosage of PMS has a slight inhibitory effect on ATZ degradation; over-acidic and over-alkaline environments were not beneficial to ATZ degradation; the presence of HCO
3
-
, H
2
PO
4
-
, and Cl
-
ions in the system all showed certain inhibitory effects on ATZ degradation. The optimal reaction conditions for the degradation of ATZ in CoCo-PBA@CuFe-LDH/PMS system were as follows:15 mg·L
-1
ATZ, 300 mg·L
-1
PMS, 50 mg·L
-1
CoCo-PBA@CuFe-LDH, initial pH 6.3, and temperature 298 K, and the degradation rate of ATZ was up to 99.5% after 15 min. After 4 times of recycling, the degradation rate of ATZ still reached 83.4%, indicating that CoCo-PBA@CuFe-LDH had good catalytic activity and reusability. In addition, the study found that sulfate radicals (SO
·-
4
) and hydroxyl radicals (·OH) were generated simultaneously in the CoCo-PBA@CuFe-LDH/PMS system, and SO
4
·-
played a more critical role in the degradation of ATZ.
2021 Vol. 38 (2): 9-18 [
Abstract
] (
1070
) [
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1KB] [
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4788KB] (
1814
)
19
Research Progress on Special-morphology Photocatalysts
Bao Erpeng, Zhang Shuoqing, Zou Jijun, Xu Qiang
Photocatalytic technology can convert solar energy into chemical energy efficiently, so it is an important method to solve the energy crisis and environmental pollution. Some special-morphology photocatalysts have the advantages of large specific surface area, low photogenerated electron-hole pair recombination rate or high light energy utilization rate. This article summarizes the synthesis strategies and photocatalytic performance of photocatalysts with different morphologies (nanowires, nanorods, nanotubes, nanosheets, core-shell structures). Various photocatalysts with special morphologies can be prepared by the hydrothermal method and the prepared photocatalysts show excellent catalytic performance. The reasons for the improvement of their photocatalytic performance include the following two aspects:1) more reactive sites can be provided; 2) the separation efficiency of photogenerated electron-hole pairs is improved. Finally, the research direction of developing photocatalysts with special morphologies is also put forward.
2021 Vol. 38 (2): 19-29 [
Abstract
] (
1126
) [
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5658KB] (
1420
)
30
Particle Distribution and Pressure Drop in a Horizontal Two-pass Liquid-solid Circulating Fluidized Bed
Jiang Feng, Wang Jinjin, Qi Guopeng, Liang Xu, Han Nisha, Li Xiulun
To promote the application of the fluidized bed heat-transfer and anti-scaling technology in the horizontal two-pass heat exchanger, a set of cold-model two-pass liquid-solid circulating fluidized bed heat exchanger with transparent horizontal tube bundle was designed and built. Water and polyformaldehyde particles were selected as the working media. The effects of the operating parameters, such as the amount of added particles (0. 50%-1. 25%) and circulation flow rate (6-11 m
3
·h
-1
), on the particle distribution and pressure drop were investigated by using a charge-coupled device (CCD) and a differential pressure transmitter. Results show that the particle distribution in the upper tube pass is relative uniform, while that in the lower tube pass is nonuniform. The solid holdups in the upper and lower tube passes both increase along the gravitational direction. A "dead zone" with low solid holdup exists in the lower tube pass, which is not beneficial to the heat transfer enhancement and fouling prevention. With the increase in circulation flow rate, the non-uniformity of particle distribution in the upper tube pass fluctuates, but that in the lower tube pass initially rapidly increases and then gradually decreases. The non-u-niformity of particle distribution in the upper and lower tube passes fluctuates with the increase in the amount of added particles. The pressure drop ratio fluctuates with the increase in circulation flow rate and the amount of added particles, and the maximum pressure drop ratio is 18. 3% within the experimental range. The three-dimensional diagrams of the effect of the operating parameters on the particle distribution and pressure drop are established to determine the proper range of operating parameter.
2021 Vol. 38 (2): 30-38,68 [
Abstract
] (
1025
) [
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1KB] [
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5047KB] (
1049
)
39
Synergetic Effect of Gelatin and Sodium Alginate on Stabilizing Oil-in-water Emulsions
Cao Lihao, Dang Leping, Wei Hongyuan
In this work, in order to improve the instability of the emulsion prepared by using single protein gelatin (GE) as an emulsifier, the effect of gelatin (GE) and sodium alginate (AL) complex coacervate on oil-in-water emulsion formulation was investigated. The zeta potentiometry and turbidimetric analysis indicate that the coacervates between gelatin (GE) and sodium alginate (AL) are formed due to electrostatic interaction at mass concentration ratio of GE and AL (
R
=8:1~1:1) with total biopolymer concentration of 0.05%. Below pH 5.1, the electrostatic interaction becomes greater with pH decreasing. Then the emulsions containing 5% soybean oil and 2% biopolymers were prepared at pH (4.5~7.0) and concentration ratio of GE and AL (
R
=4:1~1:2) characterized by particle size distribution analysis, microscopy observations and optical centrifugation (LUMiFuge116). It is found that the particle diameter of the emulsion droplets presents a downtrend at all concentration ratios with the pH decreasing from 7.0 to 4.5. At ratio of 1:1, the gelatin and sodium alginate show a better synergistic effect on the stability of the emulsion, since the emulsion have smaller droplets in size and better creaming stability. In addition, the emulsion shows better stability below 50℃ with less aggregation.
2021 Vol. 38 (2): 39-47 [
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] (
1045
) [
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9862KB] (
1874
)
48
Research Progress of Nanoscale Polymer Microspheres for Deep Profile Control and Flooding
Li Xiang, Qu Jin, Ju Ye, Tang Zhongli, Wang Shuo, Qi Peiyao, Liu Fenggang, Liu Xiaofei
The efficient extraction of crude oil is an important foundation for the country's sustainable development, and how to enhance oil recovery is an urgent problem to be solved. As a new type of deep profile control agent, nanoscale polymer microspheres have achieved significant application effects in the oilfields. The effect of enhancing waterflood recovery is obvious, which effectively supports the stable production of oilfields. Based on the review of the development process and preparation methods of nanoscale polymer microspheres, this paper introduces the current research situation of the mechanism of deep profile control of nanoscale polymer microspheres, and points out that it is urgent to establish a set of experiment methods and mathematical models that can reveal the microscopic mechanism of nanoscale polymer microspheres from the aspects of improving sweep efficiency and oil washing efficiency, systematically explain the microscopic oil displacement mechanism of nanoscale polymer microspheres. This is of great significance to elucidate the micro-mechanism of nanoscale polymer microspheres improving oil recovery and guide the development and application of new nanoscale displacement materials.
2021 Vol. 38 (2): 48-54 [
Abstract
] (
1083
) [
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1KB] [
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910KB] (
1810
)
55
Application of Microextractor in Polymyxin B Extraction Process
Cheng Yaofeng, Zhang Lijuan, Zhang Wei, Ge Kunpeng, Jü Jiaxue
A process for continuous extraction of polymyxin B was developed using miniaturization. By optimizing the key control parameters such as the micropore size of the disperser, the flow rate of the fluid in the microextractor channel, the number of microextractor stages in series and the solvent addition ratio of each stage in the multi-stage microextractor extraction process, good experimental results were achieved. The process has obvious advantages over the traditional stirred method extraction in terms of extraction rate, productivity and solvent consumption, with short operation time, good repeatability, stability and durability, and simple operation for continuous operation, which is suitable for the extraction of polymyxin B and other peptide antibiotics. It solves the problems of low extraction rate, long operation time, high solvent consumption and high COD emission of traditional stirred kettle extraction process. The miniaturization technology opens up new ideas for the realization of green production of peptide antibiotic API extraction.
2021 Vol. 38 (2): 55-60 [
Abstract
] (
1089
) [
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1KB] [
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1493KB] (
1322
)
61
Research on Preparation and Electrocatalytic Performance for Oxygen Evolution Reaction of 3D Hollow Spherical CoFe
2
O
4
@NF Composite Based on Ni Foam
Wang Hongzhi, Gao Qi, Su Zhan, Yu Jinshan, Zhang Weiguo, Yao Suwei
CoFe
2
O
4
@NF composite was prepared by a simple one-step hydrothermal method to decrease the overvoltage of oxygen evolution reaction(OER). Its composition and microstructure were analyzed by XRD, SEM, TEM and XPS, and its electrocatalytic performances of oxygen evolution reaction were tested by using a three-electrode system. CoFe
2
O
4
particles gathered into hollow spherical structure and grew on Ni foam(NF) substrate. The diameter of spherical is about 4 μm and the size of CoFe
2
O
4
particles is 40 nm approximately. In 1 mol·L
-1
KOH solution, the CoFe
2
O
4
@NF composite just needs 293 mV overpotential to reach the current density of 20 mA·cm
-2
with the Tafel slope of 51 mV·dec
-1
. In addition, after 1 000 CVs and 10 h
I
-
t
test, the electrocatalytic performance for OER of CoFe
2
O
4
@NF composite still remains high stability, which proves that the composite has a broad research prospect in the field of OER catalytic materials.
2021 Vol. 38 (2): 61-68 [
Abstract
] (
960
) [
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1KB] [
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4484KB] (
1832
)
69
Research Progress on Iron-based Bimetal Oxide as Supercapacitor Electrode
Li Chao, Na Wei, Zhang Lei
Supercapacitors, as energy storage devices with high specific power and long cycle life, play an important role in the field of portable electronic equipment and new energy vehicles. The improvement of supercapacitors' performance mainly depends on the development of new electrode materials, the innovation of electrolyte solutions, and the optimization of assembly technology. In this article, we review the preparation methods and optimization strategies of electrode for iron-based bimetal oxides, and focuse on the latest research progress on the microstructure regulation and composite construction of these materials. We summarize the innovative ideas and propose the challenges and future developments trend.
2021 Vol. 38 (2): 69-80 [
Abstract
] (
933
) [
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4625KB] (
1142
)
81
Anticorrosion Performance of Brominated Epoxy/Epoxy Composite Coatings
Wu Changhao, Wang Jixiao, Song Shuangshuang, Wang Zhi, Zhao Song
In order to improve the anticorrosion performance, composite coatings using epoxy (EP) coating as primer coating and brominated epoxy (BEP) coating as top coating were prepared and characterized. The experimental results indicated that EP provided good adhesion for the coatings, and the hydrophobicity of BEP effectively improved the anti-penetration of the coatings to the corrosion media. The composite coatings exhibited low wettability (water absorption:0.217%, contact angle:93.6°), high adhesion strength (dry:5.28 MPa, wet:2.52 MPa) and excellent anticorrosion performance (|
Z
|
0.01 Hz
>10
8
Ω·cm
2
after immersed 70 days in brine). By integrating the advantages of BEP and EP, the composite coatings exhibited long-term and promising anticorrosion performance.
2021 Vol. 38 (2): 81-87 [
Abstract
] (
1104
) [
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1KB] [
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6889KB] (
1426
)
88
Treatment of Polysilicon Organic Wastewater by Inside-circle Coupling Technology of Fe/C Micro-electrolysis and H
2
O
2
Zhao Jin, Jiang Tianxiang, Cao Junrui, Xie Baolong, Ma Yuhui, Wang Xunliang
In order to solve the problems such as filler hardening and low efficiency of Fe/C micro-electrolysis, the internal circulation was added to prevent the device from clogging. Coupling technology of Fe/C micro-electrolysis and H
2
O
2
was applied to polysilicon organic wastewater, and the effects of technological conditions such as dosing quantity of iron-carbon, initial pH, dosing quantity of H
2
O
2
, reaction time on removal efficiency of COD were mainly investigated, respectively. Moreover, the reaction conditions have been optimized by response surface method. The results indicate that the influence level of factors on removal treatment efficiency was:Fe/C micro-electrolysis, reaction time, dosing quantity of H
2
O
2
and initial pH value. The optimum technological conditions for reaction were:dosing quantity of iron-carbon 250 g·L
-1
, initial pH value 2.8, dosing quantity of H
2
O
2
112 mL·L
-1
, reaction time 83 min. Under this reaction conditions, the removal rate of COD reached 71.26%. The kinetic regression equation of COD by coupling Fe/C micro-electrolysis and H
2
O
2
was
Y
=0.5273
X
-0.6347, and the degradation rate constant was 0.527 3 min
-1
.
2021 Vol. 38 (2): 88-95 [
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] (
1123
) [
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11471KB] (
1629
)
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