JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 4
·2195-2206
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IF 1.5
Li Junze,Zhao Chuang,Guo Wenbin,Gao Yang,Liu Tingting,Zhou Yu,Hou Hongguo,Jiao Caishan,Zhang Meng
Using DMDODGA as the carrier, the transportation and separation behavior of Eu(III) and La(III) were studied using a plate-type supported liquid membrane. La(III) and Eu(III) reach their maximum transport rates at feed phase nitric acid concentrations of 2 and 4 mol/L, which are 72.41 (± 2.12)% and 77.80 (± 2.45)%; Increasing the concentration of NO 3 − in feed phase will promote the transport of both ions. The change of HNO 3 concentration in feed phase had major effect on the separation of Eu(III)/La(III), and the co-transport of Eu(III)/La(III) was observed when the concentration of NO 3 − was 3 mol/L.
研究领域:
化学工程
·
分离科学
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DOI
高影响因子
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.039
Yang Zhou,Lei Guo,Zhiheng Zhao,Sisi Zheng,Yue Xu,Bin Xiang,Savaş Kaya
The inhibition performance of domperidone on the corrosion of copper in different concentration of HCl solution has been investigated by electrochemical, weight loss, and surface analysis, and theoretical calculation methods. Results indicate that domperidone was found to be an effective inhibitor with the inhibition efficiency as high as 98.5% when the HCl concentration was 0.01 M, and the corrosion rate of copper increased with the increment of HCl concentration from 0.001 to 1 M. The potentiodynamic polarization results revealed that domperidone can be seen as a mixed type inhibitor when the HCl concentration was high (1 and 0.1 M), while it acted as a cathodic inhibitor for copper at low HCl concentrations (0.01 and 0.001 M). The potentiodynamic polarization results revealed that domperidone can be seen as mixed-type or cathodic inhibitor as the HCl concentration changes. Scanning electron microscopy studies indicated the formation of protective films of inhibitor molecule on copper surface. Besides, density functional theory-based quantum chemical calculations and molecular dynamics simulations showed the electronic structure of domperidone and its optimized adsorption configuration on copper surface, which could account for the experimental findings.
研究领域:
材料科学
·
电化学
·
理论计算
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Hao Wu,Seong-Yun Kim,Misako Miwa,Shigeo Matsuyama
In this study, the synergistic adsorption behavior of palladium [Pd(II)], molybdenum [Mo(VI)], and zirconium [Zr(IV)] in simulated high-level liquid waste was systematically investigated based on various factors, such as the contact time, concentration of nitric acid , adsorption amount, and temperature using a silica-based adsorbent impregnated with N,N′ -dimethyl- N,N′ -di-n-hexyl-thiodiglycolamide (Crea) and 2, 2′, 2′ -nitrilotris[ N,N -bis(2-ethylhexyl)acetamide] (TAMIA-EH). The adsorption rates of Pd(II), Mo(VI), and Zr(IV) in this synergistic adsorption system were high; thus, equilibrium states could be obtained in only 1 h with high uptake percentages of more than 90%. The adsorption abilities of Pd(II), Mo(VI), and Zr(IV) were only slightly affected by variation in the concentration of nitric acid in the range of 0.1–5 M and solution temperature in the range of 288–313 K. Selective stripping of the adsorbed Re(VII), Pd(II), Zr(IV), and Mo(VI) was successfully achieved under elution with 5 M HNO 3 , 0.2 M Tu (pH 1), 50 mM DTPA (pH 2), and 50 mM DTPA dissolved in 0.5 M Na 2 CO 3 (pH 11) solutions using the chromatography method. In addition, the adsorption performance in solid-state was studied using the particle-induced X-ray emission (PIXE) method; the obtained results were in good agreement with the results obtained via column separation.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2015
·Vol. 13
·期 3
·506-510
·
IF 1.32
Daixiong Zhang,Xueming Li,Yuhua Zhu,Xiaogang Guo,Hongyun He
The coating of nano-Cr 2 O 3 was successfully fabricated via aqueous electrophoretic deposition (EPD). The deposition behavior aqueous nano-Cr 2 O 3 suspension was affected by the added amount of nitric acid. The morphology of electrophoretic Cr 2 O 3 coating was significantly influenced by the deposition voltage. For a suitable EPD, stable aqueous nano-Cr 2 O 3 suspension could be obtained by the addition of 0.0025 M nitric acid, and the suitable deposition voltage was 5 V. For the purpose of increasing deposition rate which was limited by lower deposition voltage, it was suggested to employ higher suspension concentration of Cr 2 O 3 .
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 22
·5459
·
IF 4.2
Hao Peng,Zonghui Qin,Guixuan Jin,Jingjing Wang,Jielin Qin,Lihua Ao,Bing Li
In this paper, tartaric acid (C4H6O6) was used as a reductant to treat chromium (VI)-containing solution. Several independent experimental parameters, including reaction temperature, concentration of H2SO4, concentration of C4H6O6and reaction time, on the reduction process were studied. The results showed that 100% of the Cr (VI) could be reduced by C4H6O6in a strong acidic environment under a high reaction temperature. All of the experimental parameters showed positive effects on the reduction process and followed the order [H2SO4] > [C4H6O6] > reaction temperature > reaction time. A higher concentration of tartaric acid and higher reaction temperature could facilitate the reduction process and reduce reaction time.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Rao Chen,Chaoqun Yao,Shuainan Zhao,Xuan Liu,Yingjiang Lian,Guangwen Chen
It is critical for reactor design and process safety to determine the reaction kinetics for toluene nitration. Herein, a continuous-flow platform based on capillary microreactors was established. First, reaction regimes for toluene nitration and its consecutive side reaction (MNT (mononitrotoluene) nitration) were identified. On this basis, the influence of process parameters on conversion of toluene, selectivity of MNT and DNT (dinitrotoluene) and their isomer distribution were meticulously examined, including molar ratio of reactants, sulfuric acid strength, reaction temperature, and residence time. Subsequently, reaction kinetic models coupled with mass transfer were developed, allowing the simultaneous kinetic determination for toluene nitration and MNT nitration. It was found that the logarithm of the observed kinetic constant is proportional to the sulfuric acid strength. The kinetic parameters under 72.7 to 80.1 wt% sulfuric acid strengths were obtained. The outcomes provide a basis for process intensification and optimization of toluene nitration as well as other similar aromatics.
研究领域:
化学工程
·
过程强化
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhigao Ma,Bingyan Jiang,Dietmar Drummer,Lu Zhang
In micro-injection molding, polymer/mold interface adhesion may cause severe deformation or damage of micro features on the molded products. To reduce the interface adhesion and improve the molding quality of polymer microfluidic chip, Ni-P-PTFE (polytetrafluoroethylene) ternary composite was adopted to electroform mold insert with self-lubricating properties. The influence of phosphorous acid concentration on the composition and performance of Ni-P-PTFE composites was systematically investigated. Our results demonstrated that the content of P and PTFE particles in the composites raised with an increase in phosphorous acid concentration. Elevated phosphorous acid concentration adversely affected the current efficiency and slowed down the deposition rate, allowing sufficient contact time for PTFE to transfer and adsorb onto the electrode surface. The hardness of the deposited nickel increased from 310 HV to 510 HV in the Ni-P-PTFE composites. Furthermore, the Ni-P-PTFE composites demonstrated excellent self-lubricating properties, showcasing friction coefficients of 0.15 and 0.25 during the initial and steady stages, respectively, representing a notable reduction of 66.7 % and 64.3 % compared to pure nickel. This study provides a novel approach to fabricate molds with self-lubricating properties, which contributes to the high-precision injection molding of polymer-based micro devices.
研究领域:
材料科学
·
制造工程
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2013
·Vol. 67
·期 11
·1355-1363
·
IF 0.879
Gui-Zhuan Xu,Chun Chang,Wei-Na Zhu,Bo Li,Xiao-Jian Ma,Feng-Guang Du
Direct production of ethyl levulinate (EL) from glucose catalysed by a liquid acid catalyst (sulfuric acid) and a solid acid zeolite catalyst USY NKF-7 (USY) in ethanol media was investigated in this study. Effects of the initial glucose concentration (C
G0), reaction temperature (T), amount of acid catalyst, and water addition on the yields of EL were compared, respectively. The results show that higher yield of EL can be obtained at lower C
G0. Higher temperature and acid concentration can accelerate the reaction rate, but the formation rate of the by-products increases more quickly than that of EL. Water addition also can result in the decrease of the yield of EL. Although sulfuric acid is efficient in the production of EL, the USY is more efficient in converting glucose to 5-ethoxymethyl-2-furaldehyde. Moreover, the use of USY can limit the diethyl ether production, and it can be reused for multiple times.
研究领域:
生物化学
·
催化化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 24
·e53954
·
IF 3
Jian Wang,Wen Sun,Ming He
Thermoresponsive polymer hydrogels have great potential in the fields of smart window and information encryption due to the drastic changes in transmittance caused by the phase transition at specific temperatures. The synthesis of thermoresponsive hydrogels with a wide range and sensitive temperature response is current research goal. Here, we demonstrate a polymethacrylamide (PMAAm) hydrogel with the upper critical solution temperature (UCST) ranging from 62 to −1°C by simply polymerizing the monomer in different concentrations of acetic acid (Ac) solutions. The hydrogel exhibits sensitive temperature response with a temperature hysteresis within 2°C and can maintain stable transmittance changes after 200 cycles of testing. The phase transition mechanism is revealed by combining ultraviolet visible spectra, differential scanning calorimetry, Fourier transform infrared spectra, dynamic light scattering and scanning electron microscope measurements. This thermoresponsive hydrogel can be applied in smart window and information encryption. The smart window prepared with the hydrogel had a very high Δ T lum (The luminous transmittance modulation, 94.4%), ensuring daytime illumination and privacy protection at night. Meanwhile, the smart window exhibits an excellent thermal insulation capability for energy-saving buildings. The hydrogels with different UCST are flexibly combined to display designed patterns at different temperatures, demonstrating the ability of the hydrogels to be used for information encryption.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Haogui Zhao,Jing Yang,Zheng Li,Yiyun Geng,Jie Li,Mumei Chen,Ruifen Li,Qingnuan Li,Lan Zhang
The drawbacks of current high-level liquid waste (HLLW) separation processes would bring some adverse effects on the sustainable and clean utilization of nuclear power. In this work, a novel separation method for HLLW treatment based on graphene oxide membranes (GOMs) was investigated. Effects of nitric acid concentration and membrane thickness on the permeation behaviors of typical ions through GOMs were systematically investigated. On the whole, the permeation rates were in the order: hydrogen ion , cesium ion > sodium ion > strontium ion > europium ion, uranyl ion > thorium ion, which could be well explained by size exclusion and chemical interaction. As the nitric acid concentration decreased, strong coordination cations were generally restrained from migrating through GOMs due to cations hydrolysis and deprotonation of graphene oxide sheets. Ions permeation was supposed to be a two-step process which included entrance to the membrane and intramembrane migration. Based on the favorable rejection of f-block elements, GOMs separation showed promising potential in HLLW treatment. Furthermore, a new technical route for HLLW separation was proposed which showed superiority of simplified process, low running cost, less secondary radioactive waste production.
研究领域:
核能工程
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材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2013
·
IF 0.276
YUDI GUO,DONGYAN TANG,SHUO GU
The dependence of particulate Langmuir–Blodgett (LB) monolayer quality on the surface nature of the substrate was investigated by pretreating the substrates with different methods, and the optimal withdrawal speed was determined by detecting the quality of particulate monolayers deposited at different withdrawal speeds. Furthermore, the effects of stearic acid (SA) concentration on the quality of particulate monolayers were discussed. Results indicated that surface amination would favor the transfer of the floating particulate monolayer from the interface to the substrate, which would be attributed to the formation of chemical bonds between the – NH 2 groups on the substrate surface and the functional groups of – COOH and Si – OH groups on surfaces of particles floating at the interface. And the withdrawal speed of 1 mm ⋅ min -1 was appropriate for the fabrication of high-quality particulate LB monolayer because low withdrawal speed can offer sufficient time to form chemical bonds and expel the subphase from the substrate. Additionally, SEM images illustrated that the SA concentration of 0.40 mg ⋅ mL -1 was suitable for the fabrication of well-ordered particulate LB monolayers composed by the particles of 380 nm.
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 MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huimin Ruan,Zhihao Lin,Shangshang Gao,Junbin Liao,Arcadio Sotto,Yuyang Yao,Zhipeng Xu,Jiangnan Shen,Edison Huixiang Ang
Electrodialysis (ED) was widely use for sulfuric acid (H 2 SO 4 ) recovery. However, challenges such as proton leakage during ED processes and the presence of large amounts of organic solvents in the wastewater have limited the recovered acid concentration to less than 30 wt% and shortened membrane lifespan. In this study, we prepared a series of anion exchange membranes (AEMs) using 3-aminopropyltrimethoxysilane (APTMS) and phenyltriethoxysilane (phTES) as cross-linking agents aimed at concentrating H 2 SO 4 through the ED process. As the content of bis-siloxane crosslinkers increased, the ion exchange capacity (IEC) of the membranes decreased from 1.86 to 1.27 mmol g −1 , resulting in lower water flux and membrane conductivity. However, the increased crosslinker content significantly enhanced membrane hydrophobicity, thereby improving its acid-blocking properties. During ED operations at a current density of 10 mA cm −2 , the BPPO-10APTMS-10phTES membrane achieved a H + concentration of 2.15 mol/L (from an initial concentration of 1.00 mol/L), outperforming AEMs without cross-linking structure. Additionally, the BPPO-xAPTMS-xphTES membranes (x = 5, 10, and 15) exhibited strong resistance to organic solvents. This research offers valuable theoretical guidance for developing AEMs with enhanced acid concentration capabilities and solvent resistance.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）