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Current Issue
2023 Vol.40 Issue.5,
Published 2023-09-15
0
2023 Vol. 40 (5): 0-0 [
Abstract
] (
394
) [
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861KB] (
3501
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1
Preparation and properties of magnetic g-C
3
N
4
/CoFe
2
O
4
photocatalyst
LUO Jie, CHANG Wei, ZHANG Li, LEI Chao, LI Yunfeng, LIU Bin
A recyclable magnetic composite g-C
3
N
4
/CoFe
2
O
4
was prepared by ultrasonic coupled with low-temperature calcination process. The g-C
3
N
4
/CoFe
2
O
4
was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and ultraviolet visible diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the g-C
3
N
4
/CoFe
2
O
4
was investigated using Rhodamine B (RhB) as the simulated pollutant. The results show that when the mass ratio of g-C
3
N
4
to CoFe
2
O
4
is 3∶1, g-C
3
N
4
/CoFe
2
O
4
exhibits the best photocatalytic activity. The degradation rate of RhB can still reach 92% after repeated use for 5 times, showing good stability in practical application. The g-C
3
N
4
/CoFe
2
O
4
can be separated and recovered easily under an external magnetic field. Studies on the photocatalytic degradation mechanism showed that ·OH and ·O
-
2
are the main active species for photocatalytic degradation of RhB.
2023 Vol. 40 (5): 1-7 [
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] (
299
) [
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4171KB] (
630
)
8
Progress of preparation and application of magnetic Fe
3
O
4
nanoparticles
JIA Yuan, MA Huan, YANG Juxiang, LIU Zhen
As a kind of commonly used magnetic nanoparticles, Fe
3
O
4
particles possess stable chemical properties, high catalytic activity, good magnetic response and biocompatibility, and their particle size can be reduced to a few nanometers by changing the reaction conditions, thus they are widely used in high magnetic recording materials, adsorbents, biosensors, magnetic resonance imaging and other fields. In this paper, on the basis of reviewing the preparation methods of magnetic Fe
3
O
4
nanoparticles, including solid phase method, chemical coprecipitation method, hydrothermal method, microemulsion method and sol-gel method, etc., their applications in the fields of the environmental governance, biomedical, and functional material preparation are summarized, and their research and application of the future direction are also prospected.
2023 Vol. 40 (5): 8-18 [
Abstract
] (
238
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3987KB] (
1331
)
19
The effect of solvent properties on the polymerization process
LU Siyu, XING Jinfeng
Different polymerization processes in the dispersion system can prepare nanogels with different functional properties. These polymers can be widely used in biomedicine, targeted drug delivery and other fields. The control of the reaction solvent on the polymerization process is reviewed, and the focus is on emulsion polymerization and dispersion polymerization. The conversion of emulsion polymerization and dispersion polymerization is caused by adjusting the solvent. The effects of solvent polarity, solubility parameters, and critical chain length of the polymerization reaction on the polymerization method are discussed.
2023 Vol. 40 (5): 19-29 [
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235
) [
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4852KB] (
689
)
30
Desolvation mechanism and kinetics of pymetrozine dihydrate
CHEN Wei, YAO Qichao, WU Di, JI Xu, LIN Weihao, QU Siyuan, LI Jiulong, LI Chang, ZHOU Lina
This research analyzed the thermal desolvation mechanism and kinetics of pymetrozine dihydrate by TGA/DSC. The result showed that in nitrogen atmosphere, the desolvation enthalpy of pymetrozine dihydrate desolvation is 154 kJ·mol
-1
. The pymetrozine dihydrate’s desolvation process matched with the 3-dimensional nucleation and growth model (Avrami-Erofeev equation,
n
=4) well (
R
2
>0.99) in this case. The Flynn-Wall-Ozawa equation was used to analyse the correlation of conversion rate and temperature changing rate, respectively. It revealed different apparent activation energy and pre-exponential factor
A
by two correlation methods. By fitting all the data of various temperature changing rates and conversion rates, the various heating rate method can fix the two fitting methods’ deviation and reveal credible data. It revealed apparent activation energy at 44.85 (±6.59) kJ·mol
-1
(95% confidence) and lg(
A
/min
-1
) at 9.54(±1.08) (95% confidence),
R
2
=0.8141. To certify the data and compare the fitting methods, Kissinger method was used to obtain apparent activation energy and a pre-exponential factor
A
. The verification sustained the conclusion by the various heating rate method.
2023 Vol. 40 (5): 30-39 [
Abstract
] (
183
) [
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3598KB] (
553
)
40
Separation and refining method based on sublimation crystallization process
SU Xin, SHANG Zeren, YU Changyou, GAO Ye, HE Bingbing, LI Kangli, CHEN Mingyang, GONG Junbo
Sublimation crystallization is a solvent-free crystallization method and it involves a composite process of sublimation and desublimation, which means it has a direct phase transition process of solid-gas-solid. It has great advantages in the separation and refinement of high purity products, the screening of new polymorphs and the preparation of high-quality single crystals. However, there are still great challenges in its theoretical research, industrial amplification, and equipment standardization due to the complex variability of gases. This article summarized sublimation crystallization mechanisms and its applications in polymorph control, co-crystal design, separation and purification of crystal product. Several typical sublimation equipment were introduced. Moreover, some new ideas about deepening the mechanism and perfecting the model are proposed, and the key problems and development directions of sublimation crystallization in the application of efficient separation and precise control of crystallization process are discussed.
2023 Vol. 40 (5): 40-53 [
Abstract
] (
265
) [
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3654KB] (
966
)
54
A review of research on optimization of crystallization based on multi-objective process
WANG Zechen, WANG Jingtao
Crystallization is a multi-objective chemical engineering unit operation. Not only the crystal size distribution (CSD) and shape parameters of the crystal are the important indicators, but also the models of process and the achievement of the multi-objective design are also of great significance in industry. Based on the optimization control method of crystallization, this paper summarized the researches of the objectives of optimizations mentioned in relevant cases, and analyzed the research progress of online method and multi-objective optimization of batch and continuous processes systemically. The future developments and trends of optimization of crystallization researches are prospected.
2023 Vol. 40 (5): 54-63 [
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] (
247
) [
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2087KB] (
705
)
64
Effect of inclination angle on the heat transfer performance of a three-phase closed thermosyphon
JIANG Feng, LIN Yiming, MA Yuxin, QI Guopeng, LI Xiulun
A three-phase (V/L/S) closed thermosyphon (THPCT) with variable inclination angles is developed and assembled in this study. The effect of inclination angle (0°~30°), particle type and heating power (100~300 W) on the thermal performance of the THPCT is investigated by using water as the liquid working medium, and silicon carbide (SiC) particle, polyformaldehyde (POM) particle and glass bead as the solid working media, respectively. Results show that both SiC and POM particles can obviously improve the thermal performance of the thermosyphon at the four inclination angles, and the maximum overall thermal resistance reduction rate are 25.7% and 39.4% respectively, at
Q
=100 W and
θ
=30°; however, the glass beads deteriorate the heat transfer performance of the thermosyphon. The overall thermal resistances of both TPCT and THPCT fluctuate with the increase in inclination angle, and decrease with the increase in heating power, but the decreasing degree becomes smaller and smaller. The convective heat transfer coefficients of both the evaporation section and condensation section also fluctuate with the increase in inclination angle. The heat transfer of the condensation section varying with heating power is more significant compared with the evaporation section. In most cases, SiC or POM particles can improve the heat transfer of the evaporation section and condensation section; the glass beads can greatly improve the heat transfer of the evaporation section, but generally deteriorate the heat transfer of the condensation section. The thermal resistance of the evaporation section is obviously smaller than that of the condensation section for both for the TPCT and THPCT. The ratio of the thermal resistance of the evaporation section to that of the condensation section decreases with the increase in heating power at four inclination angles, but the degree decreases. The thermal resistance ratio generally fluctuates with the increase in inclination angle, but the difference among different inclination angles decreases with the increase in heating power. The addition of the SiC particles and POM particles can reduce the thermal resistance ratio, while the addition of glass beads increases thermal resistance ratio. The 3D contour maps are drawn to reflect the overall thermal resistance varying with operating parameters.
2023 Vol. 40 (5): 64-75 [
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] (
229
) [
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15114KB] (
378
)
76
Structural characterization and rheological properties of modified nano-SiO
2
oil repellents
LU Xiaobing, ZHENG Lijun, CHEN Jianuo, ZHANG Man, QU Jin, LIU Xiaofei, TANG Zhongli
To improve oil recovery significantly in low permeability reservoirs, nanofluids are favored by researchers for mobility control, wettability modification properties, as well as good temperature, salt, and shear resistance compared to conventional polymer drives. The structure and properties of modified silica (SiO
2
) were characterized and the apparent viscosity of its nanofluid was measured under different conditions through a series of experiments, and the effects of temperature, nanoparticle concentration and mineralization on the rheological properties of modified SiO
2
nanofluid were investigated. Experiments showed that the modified nano-SiO
2
had excellent stability and small average particle size of 22.92 nm, as well as a certain cross-linked structure. The apparent viscosity decreased with increasing temperature; moreover, with the increase of nanoparticle concentration, the apparent viscosity of first increasing and then decreasing, and the solution with the concentration of 0.5% showed the greatest viscosity at high shear rate, with a maximum of 1.833 mPa·s; as salinity increased, the apparent viscosity of the solution decreased. Through the study of modified SiO
2
nanoparticles, they had favorable properties of temperature resistance, salt resistance, shear resistance and control the fluidity of the injected fluid, which has a certain positive significance for enhancing oil recovery.
2023 Vol. 40 (5): 76-82 [
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] (
293
) [
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3398KB] (
692
)
83
Application of direct ink writing in energy storage devices
ZHAO Xu, HUANG Chengde
Direct ink writing (DIW), as an ideal electrode manufacturing method, makes it more convenient to fabricate electrochemical energy storage devices (EESDs) with complex structures and uniform pores. Electrodes with 3D structure have better performance than traditional electrodes in electrolyte transport and ion penetration. First, the framework structure of electrochemical energy storage devices is introduced, and then based on the impact of ink direct writing technology on the performance improvement of energy storage devices, a key review is made on carbon materials such as graphene oxide, carbon nanotubes, MXene layered materials, and polymer gels. Ink types are used for the manufacture and modification of electrodes such as lithium batteries, nickel-iron batteries, zinc-air batteries, and a summary of the performance of 3D printed energy storage devices modified by different materials in the near future is made. Finally, an outlook on the future opportunities and challenges for DIW is presented.
2023 Vol. 40 (5): 83-93 [
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] (
244
) [
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4663KB] (
507
)
94
Research progress on deep-eutectic-solvent-based ionic gels for energy storage
LI Qiqi, LI Yang, HU Deji, LIU Xingjiang, XU Qiang
As the energy crisis and environmental pollution problems become increasingly prominent,the demand for green and efficient energy storage devices is becoming urgent. Therefore, it is very important to select green materials which are environmentally friendliness, safe and easy to synthesize in energy storage devices. Deep eutectic solvents (DESs) are often used as plasticizers in ionic gels because of non-flammablity, non-volatility, low-cost and biodegradability. Ionic gels based on DESs are composed of DESs and gelators (linear polymers, polymer networks, supramolecular networks, etc.). They are simple to prepare, have excellent physical and chemical properties, and meet the demands of green chemistry. What is more, they take advantage of DESs and gelators, have different functions (ionic conductivity, pH-responsiveness, self-healing performance, etc.). Finally, the practical applications of deep-eutectic-solvent-based ionic gels in energy storage are summarized, and their development in the future is prospected.
2023 Vol. 40 (5): 94-104 [
Abstract
] (
246
) [
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5181KB] (
973
)
105
Recent advances of organic cathode materials for aqueous zinc-ion batteries
LIU Jiyuan, MA Xu, WANG Yunfeng, GOU Lin, XU Qiang
The green sustainability has expanded the demand of energy storage systems in society, especially rechargeable battery systems. Compared with other batteries systems, aqueous zinc ion batteries (AZIBs) have gained widespread attention for their inherent safety and low cost. However, traditional cathode materials based on transition metal elements have also failed to meet the needs of the green development. Organic compounds have become a research hotspot for zinc-ion batteries cathode materials due to their resource renewability, environmental friendliness and structural diversity. This paper reviews the latest research progress of organic cathode materials with different zinc storage mechanisms, including conducting polymers, carbonyl compounds, imine compounds, nitrogen oxide radical compounds, COFs/MOFs materials and triphenylamine derivatives, and provides further prospects for the future development of organic cathode materials.
2023 Vol. 40 (5): 105-116 [
Abstract
] (
238
) [
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1KB] [
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5458KB] (
1150
)
117
Dynamic adsorption of N-methyl-
D
-glucosamine-cross-linked chitosan boron chelating resin particles in the fixed bed
WU Jichen, MA Yongli, WU Qiang, LIU Mingyan
Boron extraction from salt lake brine, seawater, geothermal water and other solutions has important resource value. Adsorption method is one of the main methods for extracting boron from low concentration solution, and its key step is to develop boron adsorbents with excellent performance. At present, there are many studies on new boron adsorbents, but there are few studies on industrial applications. In order to overcome the bottleneck problems of particle powder, small size, difficult recovery, circulating utilization and industrial application of adsorbents, a new adsorbent with large particle size was prepared by grafting N-methyl-
D
-glucosamine with more
o
-hydroxy functional groups onto the surface of cross-linked chitosan. The effects of initial concentration and flow rate of boric acid solution, packing height of adsorbent and diameter ratio of fixed bed on the performance of adsorbent were studied by dynamic adsorption experiments. The results show that under certain experimental conditions, the dynamic adsorption separation effect of boron increases with the increase of initial concentration, height diameter ratio and the decrease of solution flow rate. Compared with the influence of bed height diameter ratio, the changes of initial concentration and solution flow rate have greater influence on the removal rate of boron; The dynamic adsorption performance was better when the height diameter ratio was 4, the initial concentration was 100 mL·min
-1
and the solution flow rate was 5 mL·min
-1
.
2023 Vol. 40 (5): 117-122 [
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] (
217
) [
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4200KB] (
393
)
123
Corrosion inhibition performance of furfural derivatives in hydrochloric acid solution
SHI Xuelei, WANG Jixiao, GAO Min, SONG Shuangshuang, CONG Chang, WU Changhao, WANG Zhi
It is a hot research point to prepare green corrosion inhibitors with bio-wastes as raw materials. Furfural is one of the most promising chemical platforms derived from biomass. Here, a new high-efficiency corrosion inhibitor, namely N
2
-(2-furylidene)-1,3,5-triazine-2,4,6-triamine (FMA), was prepared by condensation reaction of furfural and melamine. Corrosion inhibition performance of FMA in 1.0 mol·L
-1
HCl was characterized by weight loss test, electrochemical measurement and surface characterization. The static weight loss test results under room temperature condition show that the corrosion inhibition efficiency is as high as 95.14% under the condition of the FMA concentration at 200 mg·L
-1
, while the temperature is up to 338 K, the corresponding corrosion inhibition efficiency remains above 90%. The electrochemical test results show that FMA is a mixed type corrosion inhibitor that mainly inhibits anode process, and its excellent corrosion inhibition performance is attributed to the ability to form an adsorption film on the surface of mild steel that obeys the Langmuir isotherm adsorption model.Scanning electron microscopy (SEM) results show that the surface of mild steel containing FMA is still smooth flat after being immersed in 1.0 mol·L
-1
HCl solution for 6 hours.
2023 Vol. 40 (5): 123-134 [
Abstract
] (
238
) [
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1KB] [
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4410KB] (
521
)
135
Preparation of nitrogen-doped activated carbon derived from corncob and adsorption property
LIU Yuchun, SU Wei, SUN Yan, ZHAO Yu, ZHU Rongjiao, CHEN Lei
N-doped activated carbon was prepared from corncob with KOH-activation and urea used as N-doping agent. 77 K nitrogen adsorption isotherm was measured to determine the specific surface area and the pore size distribution. The surface and morphous were analyzed by XRD, XPS, and FT-IR. The effect of urea adding amount and adding stage on the properties of activated carbon was investigated. It was showed that the specific surface area of nitrogen-doped activated carbon can reach higher than 3 000 m
2
·g
-1
. Nitrogen-doped activated carbon with urea added at different stages had similar pore size distribution, when the adsorption performance of N
2
, CH
4
and CO
2
was distinct due to the difference in specific surface area and nitrogen content. The addition of urea was beneficial to enhance the adsorption selectivity of activated carbon for CO
2
by increasing the content of pyrrolic nitrogen. The ACNA2 presented the best CO
2
adsorption and separation performance at 268 K. Comparing with the sample AC without adding urea, the separation factor of CO
2
/N
2
and CO
2
/CH
4
were 10.30 and 3.74, increased by 87.6% and 59.8% respectively.
2023 Vol. 40 (5): 135-143 [
Abstract
] (
261
) [
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1KB] [
PDF
3431KB] (
626
)
144
Targeted polymeric nanoparticles for enhanced antitumor efficacy of polyoxometalates
WAN Dong, ZHANG Yuying, WANG Huan, YAO Tianzi, GUO Jianhui, LIU Yujun, ZHANG Saihui, PAN Jie
Polyoxometalates (POMs) works as a promising agent in medicine. They are exploited for anticancer, antibacterial, and so on. But they have poor water solubility and nonspecific interactions with normal cells, resulting in toxicity side effects on liver and kidney, all of which limit their practical application for antitumor in clinic. Polymeric nanoparticles (NPs) modified with targeting molecule can solve these problems of POMs. Herein, novel polymeric NPs (PLA-mPEG
1000
/TPGS
3350
-Folate) encapsulating POMs were developed for targeted delivery of POMs to tumor cells. In comparison with NPs without targeting function, these NPs decorated with folate (FOL) illustrated high antitumor activity to MCF-7 melanoma cells
in vitro
, which is perhaps due to enhanced cellular take through folate receptor-mediated endocytosis pathway. As a result, it is supposed that these NPs designed in this work have enormous potential for the treatment of cancer in the future.
2023 Vol. 40 (5): 144-150 [
Abstract
] (
261
) [
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1KB] [
PDF
2746KB] (
724
)
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