JOURNAL OF MOLECULAR STRUCTURE
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2023
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IF 3.8
Xingxin Xu,June Qu,Hualiang Huang
In this work, a low-cost and easily purified small molecule dibenzimidazole compound (BBI) was synthesized by the condensation of o-phenylenediamine and malonic acid. BBI was a new corrosion inhibitor for magnesium alloys and its corrosion inhibition behavior on AZ91D magnesium alloy was studied by electrochemical measurements, surface analysis and theoretical calculations in 3.5 wt.% NaCl solution at 30 °C. The adsorption behavior and corrosion inhibition mechanism of BBI molecules were discussed. It was found that BBI exhibited excellent inhibition effect on the corrosion of magnesium alloy. When BBI concentration was 0.25 g/L, the optimal corrosion inhibition efficiency was 86.2%. The adsorption of BBI molecule obeyed Langmuir adsorption on the surface of magnesium alloy, and one side of BBI molecule was adsorbed on the surface of magnesium alloy in parallel through physical and chemical mixed adsorption.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Shuai Gao,Yafei Huang,Ye Xiong,Xugeng Guo,Jinglai Zhang,Li Wang
Quaternary ammonium based ionic liquids (ILs) are considered as good corrosion inhibitors to protect substrates of metals such as carbon steel, copper and aluminum alloys against corrosion. However, studies applying them to the corrosion protection of magnesium (Mg) alloys still remain scarce. Herein, in this work, three quaternary ammonium based dicationic ILs, namely [DMBAB][MOPS] 2 , [DMBAB][Phe] 2 and [DMBAB][Trp] 2 were synthesized and applied as corrosion inhibitors to improve the corrosion protection ability on AZ91D Mg alloy in 0.5 wt% NaCl solution. Their corrosion inhibition performances were evaluated by electrochemical measurements, and the relevant corrosion results were investigated by extensive characterizations including scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Results show that the [DMBAB][Trp] 2 obtains an 88.8 % inhibition efficiency for AZ91D Mg alloy in 0.5 wt% NaCl solution, clearly higher than those of [DMBAB][Phe] 2 (80.4 %) and [DMBAB][MOPS] 2 (81.7 %). This suggests that [DMBAB][Trp] 2 presents the best corrosion protection ability on AZ91D Mg alloy among these ILs considered here, which is associated with the largest steric body and the most active adsorption sites of [DMBAB][Trp] 2 in comparison with other two compounds, hence resulting in a highest surface coverage. The present work offers a guidance for understanding the structure–property relationship of quaternary ammonium based dicationic ILs through a convenient, economical and effective way with a promising application in the field of material protection.
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Journal of the Taiwan Institute of Chemical Engineers
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2019
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IF 3.834
Hongyu Cen,Zhenyu Chen,Xingpeng Guo
N and S co-doped carbon dots (N, S-CDs) were synthesized and used as corrosion inhibitors for the first time in this study. The inhibition performance of N, S-CDs for carbon steel in CO 2 -saturated NaCl solution was investigated. Results showed that N, S-CDs can effectively protect carbon steel from corrosion and the inhibition efficiency increases as the concentration of N, S-CDs increases, reaching 93% at 50 mg/L. Even at the low concentration, such as 10 mg/L N, S-CDs, the corrosion current density reduces from 1.472 × 10 −4 A·cm −2 in the blank condition to 2.99 × 10 −5 A·cm −2 after 12 h immersion. N, S-CDs can adsorb on carbon steel through their functional groups and nanoparticles made up of N, S-CDs can form a hydrophobic film on the metal surface, whose thickness was about 40 nm. A theoretical model is established to describe the inhibition mechanism of N, S-CDs.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Hongju Qiu,Yanqiong Zhang,Weiwei Huang,Jinhui Peng,Jin Chen,Lei Gao,Mamdouh Omran,Nan Li,Guo Chen
Tetragonal zirconia nanopowders (3Y-TZP NPs) stabilized by 3 mol % Y2O3 were synthesized by a novel sol–gel–flux method. The effects of calcination temperature, Y2O3 content, and molten salt system (NaCl + KCl binary system and NaCl unary system) on the phase composition and morphology of nanopowders (NPs) were investigated. Meanwhile, the sintering properties of the prepared 3Y-TZP NPs were studied. The 3Y-TZP NPs and sintered ceramics were characterized by thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) analysis, and X-ray fluorescence (XRF) spectroscopy. The results show that the optimum calcination temperature for obtaining dispersed ZrO2 NPs is reduced from 800 to 660 °C when the NaCl unary system is substituted by the NaCl + KCl binary system. 3Y-TZP NPs with a single tetragonal phase are obtained in the NaCl + KCl binary system when Y2O3 content in the raw material is 5 mol %. The average particle size of the obtained ZrO2 NPs is reduced from 47.25 nm in the unary system to 26.18 nm in the binary system because of the lower calcining temperature. Furthermore, the 3Y-TZP NPs obtained in the binary system have narrower particle size distribution and better sintering performance than ZrO2 NPs obtained in the unary system. After sintering for 4 h at 1200 °C, the former generated 3Y-TZP ceramics with higher density and finer grain size. This work produced narrow-distributed well-dispersed 3Y-TZP NPs with quasi-spherical morphology, which are good candidates for the applications, including oxygen sensors and thermal barrier coatings.
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FOOD HYDROCOLLOIDS
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2023
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IF 10.7
Ge Xu,Jixia Kang,Wujun You,Ruyi Li,Huijuan Zheng,Lishuang Lv,Qiuting Zhang
Providing texture-modified food for dysphagia patients has been one of the most effective treatment methods. The current study aimed to evaluate a specially designed commercial pea protein isolate (PPIc) -based texture-modified food by ultrasonic treatment (US, 390 W; 20 min) at different NaCl concentrations by adjusting its texture and structure. The results showed that US can improve the texture properties of PPIc within a certain range of NaCl concentration (0.03–0.6 M). The prepared PPIc samples exhibited good mastication and swallowing characteristics with proper viscosity (33.31–704.2 mPa·s), softness (gel strength <30 g), wetness (good solubility and water holding capacity), etc. While with ultrasonic condition at the low NaCl concentration (0.1 M), the PPIc could achieve an overall superior textural attribute than those with other salt concentrations. Further research showed that US-NaCl combination could facilitate PPIc gel to maintain a more proper dysphagia texture, not only by reducing the number of pores and unfolding structures during processing, but also by enhancing the surface area of protein particles and cross-linking interaction of proteins through more exposure of sulfhydryl groups. It was also found that the β-turns of untreated-PPIc transformed to β-sheets at high salt concentration, whereas inverted transformation was observed at low NaCl concentration (0.03 M). We further unveiled US significantly enhanced the solubility, water holding capacity , and gelling ability of the PPIc. Overall, US-NaCl would be a promising method for the preparation of modified textural PPIc, which provides a new approach to formulate low-salt, high-nutrition, and customizable food for special populations such as the elderly and dysphagia.
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Materials Today Communications
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2022
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IF 3.662
Tianliang Zhao,Zhexu Wang,Yujun Feng,Qian Li
A high-efficiency inhibitor is urgently needed for magnesium alloys to mitigate their corrosion in service. Herein, we prepared a compound inhibitor consisting of sodium phosphate (Na 3 PO 4 ) and sodium dodecyl sulphate (SDS) that can provide long-term protection for magnesium alloys. The synergy between Na 3 PO 4 and SDS on corrosion inhibition of magnesium alloy AZ91 was investigated with electrochemical measurements and surface characterisation . The inhibitive efficiency of 95.18% and synergistic coefficient of 1.2 are achieved at a formula of 10 mM Na 3 PO 4 + 5 mM SDS within 2-hour immersion. The efficiency is enhanced to 99.70% after 120 h. Na 3 PO 4 plays the dominant role of anodic inhibition by forming a precipitation film on the matrix phase α-Mg, while SDS, as a subsidiary, is preferentially adsorbed on the secondary phase β-Mg 17 Al 12 and vicinity, inhibiting cathodic reductions. The above results are promising to be applied in the development of high-efficiency compound inhibitors for magnesium alloys.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Yuanxian Zeng,Lei Kang,Ying Wu,Shan Wan,Bokai Liao,Nan Li,Xingpeng Guo
Melamine modified carbon dots (Me-CDs) was synthesized by hydrothermal method and used as effective corrosion inhibitor for Q235 carbon steel in 3.5 wt% sodium chloride (NaCl) solution. The microstructure and surface properties of Me-CDs were characterized using XRD, FTIR, XPS and TEM. The corrosion inhibition behavior and mechanism of Me-CDs for carbon steel were investigated using weight loss and electrochemical methods, in combination with some surface characterizations (including SEM, AFM and contact angle tester). Results showed that Me-CDs as mixed-type adsorbent inhibitor could effectively prevent carbon steel from corrosion, and the maximum corrosion inhibition efficiency can reach 92.36% at 200 mg/L. The absorption of Me-CDs conformed to Temkin adsorption model, involving both chemisorption and physisorption . Based on the results of characterization analysis, the chemisorption from multiple adsorption centers, physisorption by blocking and barrier effect, and the formation of hydrophobic film on the surface of carbon steel was proposed to clarify the corrosion inhibition mechanism of Me-CDs.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Hui Dang,Zhidong Chang,Xue Wu,Sihang Ma,Yifei Zhan,Na Li,Wenbo Liu,Wenjun Li,Hualei Zhou,Changyan Sun
Effectively extracting lithium at a relatively low temperature from the slag produced by the pyrometallurgical treatment of spent lithium-ion batteries remains a great challenge, which limits the acquirement of lithium. Herein, we proposed a eutectic system to roast slag at a lower temperature based on sodium sulfate–sodium chloride (Na 2 SO 4 –NaCl) binary eutectic salts. The optimal roasting conditions are as follows: the slag was roasted at 750 °C with a (SO 4 2– +Cl – )/Li + molar ratio of 5:1 for 120 min. Followed by aqueous leaching 5 min at room temperature with a water/roasted samples mass ratio of 30:1, it can get 97.07% lithium extraction efficiency.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
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IF 3.178
Lan Yang,Xiuxiu Yang,Dan Li,Liwei Zhuang,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and refractive indices in the systems Na 2 SO 4 –NaBO 2 –H 2 O and NaCl–Na 2 SO 4 –NaBO 2 –H 2 O at 323.15 K were studied by the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for Na 2 SO 4 and NaBO 2 ·4H 2 O. A comparison of the diagrams of system Na 2 SO 4 –NaBO 2 –H 2 O from 288.15 K to 323.15 K shows that the crystallization region of NaBO 2 ·4H 2 O changes greatly as the temperature increasing, and the solid phase of mirabilite at 288.15 K and 298.15 K transforms into the nardite at 308.15 K and 323.15 K. The dry-salt diagram of the quaternary system consists of four salt crystallization fields for NaCl , NaBO 2 ·4H 2 O, NaCl·NaBO 2 ·2H 2 O and Na 2 SO 4 , five univariant solubility curves and two invariant points. On the basis of the Pitzer model, the lacking Pitzer parameters and dissolution equilibrium constants of the solid phases in this quaternary system were fitted with the solubilities and other thermodynamic properties in this study and literature. The calculated solubilities in the two systems are in good agreement with the experimental data.
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Journal of Magnesium and Alloys
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2021
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IF 10.088
Baojing Feng,Guonan Liu,Peixu Yang,Sensen Huang,Dongqing Qi,Peng Chen,Chengduo Wang,Jiang Du,Shaojun Zhang,Jinhui Liu
Effect of the second phase in the micro-galvanic corrosion of a commercial Mg alloy containing rare earth elements, cast WE43 alloy, was investigated in 0.6 M NaCl solution and 0.6 M Na 2 SO 4 solution by scanning electron microscopy (SEM) observations, scanning Kelvin probe force microscopy (SKPFM) analysis, hydrogen evolution, weight loss measurement, and electrochemical techniques. It is confirmed that the second phase of cast WE43 alloy is more active than Mg matrix and exhibits an anodic role in the micro-galvanic corrosion with α-Mg matrix as cathode and dissolves preferentially in Na 2 SO 4 solution, in contrast to the situation in NaCl solution. The corrosion rate of cast WE43 alloy in Na 2 SO 4 solution is much higher than that in NaCl solution, which is different from the conventional wisdom and could be attributed to the different role of the second phase in the micro-galvanic corrosion in two solutions.
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APPLIED ENERGY
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2022
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IF 11.446
Qingyang Luo,Xianglei Liu,Qiao Xu,Yang Tian,Haichen Yao,Jianguo Wang,Shushan Lv,Chunzhuo Dang,Yimin Xuan
Focusing on the development of the next generation latent heat thermal energy storage (TES), molten salt is one of the most promising candidates, while it suffers from small thermal charging rate and low energy storage density. Adding ceramic nanoparticles (NPs) with high thermal conductivity and high chemical stabilities has been proposed to alleviate above problems. However, it’s very challenging to enhance both thermal conductivity and specific heat capacity ( C p ) simultaneously. Besides, induced viscosity increment by NPs will instead reduce the thermal charging rate of TES system, due to suppressed natural convection of molten salts. Herein, concurrent enhancement in solidus thermal conductivity and C p is demonstrated by doping MgO NPs into LiNO 3 /NaCl, which are improved by 63.5 % and 32.3 % at 4 wt%, respectively. The underlying mechanism is attributed to very low interfacial thermal resistance ( R b = 2.424 × 10 −9 K·m 2 ·W −1 ) between MgO and LiNO 3 /NaCl. Benefiting from enhanced C p , the total energy storage density increases from 662.9 J·g −1 to 671.7 J·g −1 for temperature range of 50–300 °C despite decreased phase change enthalpy. The viscosity has a sharp increase from 4.2 cP to 22.4 cP when NPs concentration rises from 0 wt% to 10 wt% at 360 °C. When being applied in TES system, the optimal concentration of MgO NPs is found to be 4 wt%. The thermal charging rate of TES system is suppressed when NPs concentration is too low or too high due to limited thermal conduction and inhibited natural convection, respectively. Viscosity is verified as important as thermal conductivity in system level evaluation. This work helps to guide the design of high-performance molten salts in TES system, so as to achieve both faster thermal charging rate and higher energy storage density.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Yunxue Gao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
The (solid + liquid) phase equilibrium of the ternary system (NaCl + RbCl + H 2 O) at T = (288.15, 298.15 and 308.15) K was studied by the method of isothermal solution saturation. Moreover, the density and refractive index of the solution was also determined. The solid phase was studied by the Schreinemaker’s wet residue method and verified by X-ray diffraction. The results show that each of the phase diagrams contains one invariant point, two univariant curves, and three crystallization regions. The crystallization region of NaCl increased obviously with the temperature increasing, while the crystallization regions of RbCl and the mixed crystallization region of (NaCl + RbCl) decreased a little. Furthermore, there are break points at the invariant points for density and refractive index curves.
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