Polymers
·
2020
·Vol. 12
·期 1
·151
·
IF 3.426
Juan Tan,Shuibo Xie,Guohua Wang,Chuck Wah Yu,Taotao Zeng,Pingli Cai,Huayong Huang
In this work, the thermo-sensitive materials N-isopropylacrylamide (NIPAM) and acrylic acid (AA) were crosslinked with carboxymethyl cellulose (CMC) (CMC/P (NIPAM-co-AA)) via a free radical polymerization method for the removal of U(VI) from aqueous solution. The L16 (45) orthogonal experiments were designed for the optimization of the synthesis condition. The chemical structures of the crosslinking hydrogel were confirmed by FTIR spectroscopy. The microstructural analyses were conducted though scanning electron microscopy (SEM) to show the pore structure of the hydrogel. The adsorption performance of the CMC/P (NIPAM-co-AA) hydrogel for the uptake of U(VI) from simulated wastewater was also investigated. The adsorption reached equilibrium within 1 h. Under the reaction of pH = 6 and a temperature of 298 K, an initial concentration of U(VI) of 5 mg·L−1, and 10 mg of the CMC/P(NIPAM-co-AA) hydrogel, the maximum adsorption capacity was 14.69 mg g−1. The kinetics fitted perfectly with the pseudo-second-order model, and the isotherms for the composite hydrogel adsorption of U(VI) was in accordance with the Langmuir model. The chemical modification confirmed that the acylamino group played an important role in uranium adsorption. The desorption and reusability study revealed that the resolution rate was still available at approximately 77.74% after five alternate heating cycles at 20 and 50 °C of adsorption-desorption.Keywords:orthogonal experiments;U(VI);thermo-sensitive hydrogel;adsorption;wastewater treatment
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 7
·1-9
·
IF 2.983
Zhang Lei,Han Zhikun,Jia Yang,Han Yuzhen
Nitrogen oxides (NOx) could cause acid rain, photochemical smog, and even cause serious harm to human life and health and safety. Therefore, it was urgent to control and reduce NOx. In this paper, CeO 2 with a spherical structure was prepared by hydrothermal method, and the influence of different preparation conditions on the formation of CeO 2 was studied by orthogonal experiments. Then CeO 2 was used as the carrier, and a MnO 2 @CeO 2 core–shell catalyst with MnO 2 as the core and CeO 2 as the shell was developed. And it was successfully applied to SCO denitration. Through SEM, TEM and XRD characterization, the effects of different manganese-cerium ratios and core–shell morphology on the denitration performance were studied. The results showed that: (1) When the concentration of cerium chloride solution was 0.6 mol/L, urea was 30 g, glucose was 40 g, and the hydrothermal temperature is 200 ℃, the prepared CeO 2 catalyst had uniform particle size and high dispersibility. Its catalytic activity was better than that of catalysts prepared under other conditions, and the conversion rate of NO at 250 ℃ was up to 85%; (2) The denitration performance of the MnO 2 @CeO 2 composite3 catalyst was significantly better than that of the CeO 2 catalyst alone. At the same time, the MnO 2 @CeO 2 core–shell catalyst prepared with MnCl 2 ·4H 2 O as the manganese precursor had a better conversion rate of NO than that of the other two manganese precursor catalysts.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yabing Qi
1,2-Diphenylethane can be widely used in organic synthesis field because of its particular molecular structure. In order to gain high pure 1,2-diphenylethane, the mainly conventional purification method is vacuum distillation. However, the vacuum distillation exhausts excessive energy, needs heavy tower equipment, and it is not easy to achieve high pure product. To obtain high pure 1,2-diphenylethane, save money, and conserve energy, the cooling crystallization with ethanol is used to purify 1,2-diphenylethane. Firstly, the impact of crystallization temperature, crystal growing time, cooling rate, stirring speed, seed size, and seed weight on the cooling crystallization processes of 1,2-diphenylethane in ethanol were investigated. Then, the orthogonal experiment were also studied. It provides a reference for industrial cooling crystallization of 1,2-diphenylethane.
研究领域:
有机合成
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2021
·Vol. 36
·期 4
·928-936
·
IF 2.464
Xiyue He,Wenxiang Li,Bijun Fang,Shuai Zhang,Xiaolong Lu,Jianning Ding
By designing an orthogonal experiment with four factors and three levels, (Na 0.5 Bi 0.495 Nd 0.005 )TiO 3 (NBT-Nd) nanopowders were prepared using a hydrothermal method under different conditions to determine the optimum hydrothermal synthesis conditions. The synthesized NBT-Nd nanopowders were characterized using X-ray diffraction measurement, ultraviolet–visible spectra, photoluminescence spectra, and transmission electron microscopy to evaluate the orthogonal experimental conditions. The results showed that NBT-Nd powders with excellent crystalline and luminescence properties could be obtained at 160°C, with a 16 h reaction time, 8 mol·L −1 NaOH, and with 0.4489 g C 19 H 42 BrN. The optimized hydrothermal method-prepared NBT-Nd powder has a rather pure rhombohedral perovskite structure at room temperature, and exhibits an aggregated polycrystalline structure containing nanotubes and nano-sized particles. Under excitation of 247 nm light, strong fluorescence emissions are excited at 423 nm and 441 nm in the NBT-Nd powder that were generated by transitions of Nd 3+ from 2 D 5/2 to 4 I 9/2 and from 4 G 11/2 to 4 I 9/2 , respectively. Through CIE1931 chromaticity calculation of the emission peaks, the NBT-Nd powder was shown to emit indigo blue fluorescent light.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 2
·1817-1829
·
IF 2.843
Yang Yinzhi,Fan Fangwei,Xie Jinpeng,Fang Kaiyang,Zhang Qiang,Chen Yiren,Cao Xinwang,Deng Zhongmin
The composition of bamboo shoot shell is similar to hemp fiber, and whose traditional degumming process is expensive and easy to cause serious environmental pollution. Herein, acid pretreatment combined with alkali-oxygen bath degumming process was used to obtain bamboo shoot shell fibers. The effects of the dosages of sodium hydroxide and hydrogen peroxide, soaking temperature and time on degumming were discussed. The optimized process parameters of alkali-oxygen bath degumming were obtained by orthogonal experiment as follows: sodium hydroxide 24 g/L, hydrogen peroxide 40 mL/L, scouring temperature 95 °C and alkali boiling time 150 min. The degumming rate was 72.14%. The degummed fibers were separated from each other in a single fiber state, compared to that the control samples were closely arranged by lots of fibers with rough surface caused by the presence of many non-cellulose components. The crystallinity increased from the control (43.53%) to final fiber (64.35%). The prepared bamboo shoot shell fiber is rich in cellulose (73.19%), which would provide some references for the future application and development of bamboo shoot shell fiber potentially and widely used in many aspects.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2023
·Vol. 9
·期 3
·1201-1214
·
IF 2.4
Tao Wenju,Yang Jiaxin,Chen Liyu,Zhang Yifan,Wu Shaohua,Li Jiaming,Liu Zhaoshun,He Jingui,Wang Zhaowen
The high-value, green and harmless purification of aluminum electrolysis comprehensive solid waste can not only reduce its harm to the environment and soil but also separate and recover the high-value rare elements. This study aims to develop a process for recovering and treating waste aluminum electrolytes by sulfuric acid roasting. The results of orthogonal experiments and single factor experiments indicate that under the premise of not decomposing sulfuric acid to produce secondary hazardous waste, the high-value element F in WAE can be effectively separated under the condition of calcination at 275 °C for 4 h and an acid to material ratio of 7, with a recovery rate of 87.31%. According to the mechanism obtained from the analysis and characterization results of SEM, XRD, and chemical analysis on the residual water leaching residue after roasting, the process of sulfuric acid roasting WAE is a multi-step separation process of fluorine: from Na 3 AlF 6 and Na 5 Al 3 F 14 to AlF 3 and Al 2 (SO 4 ) 3 . Each phase transformation process is accompanied by the precipitation of fluorine in the form of HF. Graphical Abstract
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2022
·
IF 2.552
Xiyue He,Bijun Fang,Dun Wu,Xiaolong Lu,Shuai Zhang,Jianning Ding
Synthesis conditions for preparing [(Ba 0.85 Ca 0.15 ) 0.995 Nd 0.005 ](Ti 0.9 Hf 0.1 )O 3 (Nd-BCTH) nanopowders by hydrothermal method were tailored using orthogonal experiment method with three factors and three levels. X-ray diffraction measurement, field emission scanning electron microscopy, transmission electron microscopy, surface aperture adsorption analyzer, ultraviolet–visible spectra, and fluorescence spectrophotometer were used to characterized the synthesized nanopowders. Well dispersed Nd-BCTH nanopowders with excellent crystallization and luminescence properties are obtained at reaction temperature of 200 °C, 14 mol⋅L −1 alkali concentration, and 24 h reaction time without adding surfactant. The nanopowders present a pure pseudo-cubic perovskite structure with rhombohedral phase approaching the morphotropic phase boundary (MPB) at room temperature, which present nano-sized particles with slight conglomeration. Using 267 nm light exciting, strong photoluminescent emission peaks are excited at 364 nm, 422 nm and 440 nm in the Nd-BCTH nanopowders, which correlate with the transitions of Nd 3+ from 4 D 3/2 → 4 I 9/2 , 2 D 5/2 → 4 I 9/2 and 4 G 11/2 → 4 I 9/2 via two processes of non-radiative relaxation and fluorescent transition, respectively. The CIE1931 chromaticity calculation of the emission peaks and fluorescent photograph show that the Nd-BCTH nanopowders emit indigo blue fluorescent light.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chen Jin,Jian Sun,Yuning Chen,Yafei Guo,Donghui Han,Ruilin Wang,Chuanwen Zhao
Sawdust wastes were used as the low-cost feedstock to prepare porous carbons by KOH activation, and the preparation parameters were optimized via orthogonal experiment. Four main activation parameters (i.e., sawdust type, KOH/sawdust ratio, activation temperature and activation time) were investigated. It is found that activation temperature and KOH/sawdust ratio are the two most important parameters that affect the porous texture properties (specific surface area and micropore volume) of sawdust wastes-derived porous carbons. The optimal sawdust wastes-derived porous carbon possesses a high specific surface area of 1601 m 2 /g and a micropore volume of 0.75 cm 3 /g, therefore exhibiting a desirable CO 2 adsorption capacity of 4.25 mmol/g at 0 °C under ambient pressure. Comparatively, the sawdust wastes-derived porous carbon extrudates exhibit the inferior CO 2 adsorption capacity, dropping to 2.85–3.03 mmol/g. It is mainly attributed to the extrusion treatment and binder addition causing the collapse and blockage of the original porous structure, consequently increasing the CO 2 diffusion and adsorption resistance. However, the sawdust wastes-derived porous carbon extrudates possess the advantages of null pressure build-up, improved bulk density and high compress strength (7.3–12.3 MPa) considering the real application point of view.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2020
·Vol. 8
·期 9
·1153
·
IF 2.753
Xi Chen,Xinyue Li,Xiangwei Zhu,Guozhen Wang,Kun Zhuang,Yuehui Wang,Wenping Ding
Jizi439, a newly developed black wheat breeding line, was reported to effectively regulate blood glucose, which may potentially be associated with its intrinsic high level of phenolic compounds (PCs). To maximize the PCs yield and thereby enhance their antioxidant activity, orthogonal experiments were designed in sequence for extrusion of Jizi439 black wheat bran (BWB) powder and followed by the extraction of PCs assisted with ultrasound technique. White wheat bran was used as a control. The optimum condition for extrusion was 110 °C, 25% feed water content, 140 rpm screw speed; meanwhile, 50 °C, 40 min, 35 kHz ultrasonic frequency, 300 W ultrasonic power for ultrasound-assisted extraction (UAE). Total phenolic content (TPC) as determined by Folin–Ciocalteu method was 2856.3 ± 57.7 μg gallic acid equivalents (GAE) per gram of dry weight (DW) of phenolic extract; meanwhile, antioxidant activity (AA) in terms of DPPH radical scavenging ratio was 85.5% ± 1.1% under optimized conditions, which were both significantly higher than the control. Phenolic acids except for gallic acid, as well as flavonoids, including luteolin and apigenin were increased by extrusion and ultrasound, as suggested by HPLC results. In conclusion, our study would provide a valuable reference for processing Jizi439 BWB before making or commercially utilize it into health-related food products.Keywords:extrusion;ultrasound-assisted extraction;Jizi439 black wheat;phenolic compounds;orthogonal experiment
研究领域:
食品科学
·
植物化学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Kaifeng Wang,Yuxun Kan,Yunsheng Zhu,Kaihong Zhong,Jiabing Hu
Calcium silicate hydrate (C-S-H) is considered a novel early strength agent, showing immense potential in enhancing the early strength of cement-based materials. Polycarboxylate (PCE) is widely used as a dispersant in the synthesis of nano-C-S-H to prevent agglomeration during synthesis. However, a comprehensive investigation is still required to establish a stable method for preparing stable C-S-H/PCE nanocomposites using chemical co-precipitation. This study employed orthogonal experiments, range analysis, variance analysis, and multi-index matrix analysis to explore the effect of the chemical co-precipitation synthesis process on the stability of C-S-H/PCE nanocomposites. It conclusively identified the calcium-to-silicon (C/S) ratio as the sole significant influencing factor, establishing optimal synthesis parameters: a C/S ratio of 1.6, stirring at 8000 r/min, a 2-hour reaction time, and a reaction temperature of 30 °C. Additionally, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were utilized to investigate the impact of the C/S ratio on the structure and morphology of C-S-H/PCE nanocomposites. Results indicated that under the optimal synthesis parameters, the average particle size and precipitation rate of the synthesized C-S-H/PCE nanocomposites were 0.122 µm and 0.44%, respectively, exhibiting a 4.7% and 47.6% improvement over the best samples in the orthogonal test. Increasing the C/S ratio decreased the crystallinity of the C-S-H/PCE nanocomposites, resulting in the emergence of multiple crystal structures, compact and ordered morphology, and reduced sedimentation. These findings collectively underscore that C-S-H/PCE nanocomposites with higher C/S ratios exhibit enhanced dispersion and stability, validating the rationality of the optimal synthesis parameters identified in this study.
研究领域:
建筑材料学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 17
·22232-22244
·
IF 2.478
Liu Ting,Zhai Xiaoyu,Liu Jiaxiang
Indium tin oxide (ITO) is a promising transparent conducting oxide material for photoelectric devices. In this work, the low-resistivity cubic ITO (c-ITO) nanopowders were synthesized via polyacrylamide gel route. The orthogonal experiment design was applied to optimize preparation process that was as follows: n (AM)/ n (MBAM) = 25:6, c (In 3+ ) = 0.3 mol/L, calcination temperature ( T ) = 700 °C, holding time ( t ) = 9 h. Subsequently, the thermal decomposition process of ITO xerogel, crystal structure, morphology, and electrical conductivity of the optimum sample were characterized systematically. The results indicated that the thermal decomposition of ITO xerogel was a multi-step kinetic reaction process, and the activation energy of reaction depended on the conversion of ITO xerogel. The powders were well indexed to cubic ITO crystal phase, and presented a concentrated particle size distribution of 34–54 nm and nearly spherical-like morphology. The low-resistivity value of 0.161 Ω·cm was obtained under the optimum preparation process. Moreover, the formation mechanism of ITO nanopowders prepared via polyacrylamide gel route was also investigated. The synthesized ITO nanopowders with low resistivity present wide application prospects of next-generation ITO functional materials.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2021
·Vol. 44
·期 2
·1-8
·
IF 1.783
Zhang Hui-mei,Zhang Yan,Zhang Jia-wen,Ye Xu,Li Yuan-yuan,Wang Ping
In this study, silver nanowires (AgNWs) were prepared by the polyol method using silver nitrate (AgNO 3 ) as the silver source and polyvinylpyrrolidone (PVP) as the structure-directing agent under different reaction conditions. In order to obtain AgNWs with good uniformity and electrical conductivity, the orthogonal experiment method was adopted to design an experimental scheme. The scanning electron microscope, energy-dispersive X-ray spectrometer, X-ray diffraction, UV-2550 UV–Visible spectrophotometer, transmission electron microscope, Fourier transform infrared and Raman spectra were combined to characterize synthesized AgNWs. It can be concluded from experimental data that when the reaction temperature is 150°C, the ratio of AgNO 3 to PVP is 1:3, the drop rate of PVP is 65 ml h –1 , with the existence of ferric chloride (FeCl 3 ), and the AgNWs exhibit optimal morphology with the diameter ranging from 60 to 200 nm. The results in this study will provide experimental guide for controllable formation of AgNWs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）