CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Dongyang Qiu,Zhangqiang Dong,Lijuan Liu,Chuyuan Huang,Youbang Yue,Gang Zhang,Lijian Hao,Xianfeng Chen
Dust explosions caused by energetic metals pose a significant risk to process industries, making it crucial to develop high-performance explosion inhibitors. In this study, the modified power plant solid waste fly ash (FA) was confirmed as a raw material for the preparation of core–shell inhibitors to efficiently suppress dust explosion of Al-Mg alloy. The interfacial compatibility of FA was dramatically improved by using alkali hydrothermal modification and organic modification. It formed a well-coated nano-Mg(OH) 2 cladding layer on the surface of modified FA by the heterogeneous nucleation method. In a vertical combustion pipe and a 20 L spherical explosion device, the suppression effect of this novel core–shell inhibitor (FA-2@Mg(OH) 2 ) was investigated. The experimental results showed that the addition of 60 wt% of FA-2@Mg(OH) 2 reduced the maximum flame velocity ( V max ), velocity to the top of the pipe ( V top ), and average pulsation degree ( V ap ) by 87.9 %, 92.5 %, and 87.7 %, respectively, and the peak flame temperature ( T p ) declined to 298 °C. The maximum explosion pressure ( P max ) and the maximum explosion pressure rise rate (( dp / dt ) max ) were reduced by 86.1 % and 92.9 %, respectively. Combining the analysis results of SEM, EDS , XRD , and TG-DSC, the suppression mechanism of FA-2@Mg(OH) 2 was explained in depth, mainly from the heat absorption, coating effect, gas dilution, and radical adsorption. This work not only sheds new light on the design of dust explosion suppression functional materials but also broadens the application of industrial solid waste FA.
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DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Minghui Duan,Guo Zeng,Jian He,Weiguo Wang
Carbon nitride (g-C 3 N 4 ) is a potential material that can be used for the treatment of the wastewater contains organic dyes. However, the photocatalytic efficiency of g-C 3 N 4 is limited by the wide band gap and fast recombination of photon-generated carriers. In this work, the co-doped with Mg and Zn of Mg Zn 0.07 -g-C 3 N 4 was designed and prepared to enhance the photocatalytic efficiency. The co-doped Mg and Zn shorted the band gap of g-C 3 N 4 from 2.74 eV to 2.50 eV. Interestingly, according to the DFT calculation, a Zn-bridge is formed between the interlayers of g-C 3 N 4 . The Zn-bridge reduces the electron localization and prolongs the existence time of photon-generated carriers. The as-prepared Mg Zn 0.07 -g-C 3 N 4 was applied for the photodegradation of methylene blue. The degradation ratios and photodynamic parameter of Mg Zn 0.07 -g-C 3 N 4 are higher than that of g-C 3 N 4 and Mg-g-C 3 N 4 (29.51 × 10 −3 min vs 8.00 × 10 −3 min).
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Polymer-Plastics Technology and Materials
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2019
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IF 0
Ying Pan,Ke Ke,Lin Cheng,Hongting Zhao
In this study, flexible polyurethane foam (FPUF) was successfully coated with nano-Mg(OH)2 platelets. Due to the strong interaction between chitosan and nano-Mg(OH)2, it was possible to yield modified foam with a weight-gain of up to 15 wt% by depositing one chitosan layer and one nano-Mg(OH)2 layer. Meanwhile, the adsorption isotherms of Cu2+ on FPUF covered with 10 wt% coating (FPUF-10) shows the Langmuir behavior. It was found that for the FPUF-10, the removal % for Cu2+ after 30 min and 50 min treatment were 86% and 90%, respectively. Moreover, the maximum removal % could reach up to 95%.
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IONICS
·
2019
·Vol. 25
·期 11
·5353-5360
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IF 2.289
Ren Xiaoying,Xu Tao,Du Junlin,Pu Zhaohui,Wang Runbo,Wu Zhu
High-temperature battery system operated at or below 300 °C is highly desired for geothermal borehole applications. However, it remains a challenge to find suitable electrode materials meeting the need of wide borehole temperature. In this study, the discharge performance of Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy battery system was studied over the temperature range of 150~300 °C with different current densities ranging from 10 to 30 mA cm −2 . The electrochemical test result showed that the single cell delivered maximum discharge capacity at 250 °C, with value of 1178.6 mAh g −1 at a current density of 10 mA cm −2 . Besides, it is found that the discharge capacities of the single cell increased as the current density rose at 300 °C attributed to the enhanced ionic conductivity at high temperature. As a result, the Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy system is capable of being used in instrumentation for geothermal and oil/gas borehole explore between 200 and 250 °C.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 47
·12879-12887
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IF 5.976
Zhuang Li,Fei Liang,Yangwu Guo,Zheshuai Lin,Jiyong Yao,Guochun Zhang,Wenlong Yin,Yicheng Wu,Chuangtian Chen
Demands for UV birefringent materials are growing dramatically owing to the rapid development of ultraviolet technology. Here, a new family of UV birefringent materials, Ba2Mg(C3N3O3)2 (BMCY) and Ba2Ca(C3N3O3)2 (BCCY), have been successfully discovered. It is the first time that the excellent birefringent properties of cyanurates have been studied. These materials exhibit an extremely large birefringence (Δn = 0.728–0.351 and 0.771–0.346 from 230 nm to 800 nm for BMCY and BCCY, respectively), much larger than that of the commercial UV birefringent crystal α-BaB2O4 (α-BBO) (Δn = 0.12@532 nm). Our study indicates that the impressive optical properties of BMCY and BCCY stem from the strengthened optical anisotropy of the planar (C3N3O3)3− group compared with the isoelectronic (B3O6)3− group. Besides, its congruent-melting properties make it feasible to grow a bulk crystal by the Bridgman–Stockbarger technique. The extraordinary properties of BMCY and BCCY may shed light on a new path to explore birefringent materials for practical application.
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ELECTROCHIMICA ACTA
·
2018
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IF 5.116
Xingyue Liu,Zhiyong Liu,Bo Sun,Xianhua Tan,Haibo Ye,Yuxue Tu,Tielin Shi,Zirong Tang,Guanglan Liao
Electron transport layer (ETL), functioning as the electron transportation and extraction layer as well as hole-blocking layer, plays an important role in planar perovskite solar cells (PSCs). Majority of the state-of-the-art PSCs contain a TiO 2 ETL always requiring a high temperature (500 °C) treatment, which is both energy-consuming and incompatible with flexible substrates, thus hindering large-scale application in flexible devices. Here, we demonstrated a low-temperature (70 °C) solution-processed Mg-doped rutile TiO 2 as ETL in planar PSCs, while the thermal-evaporated copper phthalocyanine (CuPc) and doctor-bladed carbon were introduced as the hole transport layer (HTL) and counter electrode, respectively. The as-prepared PSC obtains a 15.73% power conversion efficiency (PCE), which is quite an excellent efficiency among carbon-based planar PSCs, getting an increase by 16% compared to the 13.56% PCE of the pristine TiO 2 -based device. The prominent increment is mainly attributed to the faster charge extraction, better electrical conductivity and suppressed charge recombination of Mg-doped TiO 2 . Besides, using highly stable CuPc and commercial carbon makes the as-prepared PSCs highly durable over 30 days when exposed to the ambient air with a relative humidity of 50%. Since all the processes are conducted under 100 °C, our work paves a way for developing cost-effective and highly stable PSCs compatible with flexible substrates.
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ORGANIC ELECTRONICS
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2019
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IF 3.495
Rashed Alsharafi,Yangbin Zhu,Fushan Li,Zhongwei Xu,Hailong Hu,Tailiang Guo
Zinc oxide (ZnO) nanoparticles (NPs) are extensively adopted material to be used as efficient electron transport layer (ETL) in quantum dot light emitting diodes (QLEDs) due to their suitable properties of high electron mobility , good stability, and easy processability. However, because of the naturally high work function of ZnO NPs, the electrons can be spontaneously transferred at the quantum dot/ZnO interface. In addition, the enormous difference in electron and hole mobility can lead to interfacial exciton quenching and unbalanced charge injection. In this paper, the strategy of replacing the ZnO in QLEDs with Mg and polyvinylpyrrolidone (PVP) inorganic-organic hybrid co-doped ZnO NPs are introduced. The energy band structures of ZnO NPs are tailored by tuning the concentrations of Mg, resulting in a significant suppression of the spontaneous charge transfer at the quantum dot/ETL interface. Furthermore, the surface quenching sites and the electronic mobility of ETL were adjusted via PVP doping. The proposed method significantly enhances the current efficiency and external quantum efficiency to 16.16 cd/A and 15.45%, respectively, an improvement of about 2.5-fold compared to the devices with pure ZnO NPs.
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RSC Advances
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2016
·Vol. 6
·期 72
·67610-67618
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IF 3.289
Xiuling Xu,Fan Hu,Saisai Yan,Jianguang Lin,Qing Li,Qi Shuai
Four novel Mg(II) coordination compounds [Mg(CPA)2(H2O)4] 1, [Mg(H2O)6]·(MCPA)2 2, [Mg(DCPA)(H2O)5]·(DCPA) 3 and [Mg(TCPA)2(H2O)4]·2H2O 4 were designed by the strategy of hydrogen bonding driven self-assembly (HCPA = 2-chlorophenoxyacetic acid, HMCPA = 2-methyl-4-chlorophenoxyacetic acid, HDCPA = 2,3-dichlorophenoxyacetic acid and HTCPA = 2,4,6-trichlorophenoxyacetic acid). Single-crystal X-ray diffraction demonstrated that each coordination compound had its own specific motif driven by multiple hydrogen bonding: rectangle motif (compound 1), butterfly motif (compound 2), head and tail connected double heart-rectangle motif (compound 3) and alternative one side shared hexagon-rectangle motif (compound 4). The hydrogen bonding effects (O–H⋯Cl and O–H⋯O) on thermostability of the title compounds were well proved by TG analysis. The antibacterial activity of 1–4 has been explored, and all of them showed antibacterial efficiency against colibacillus at certain concentrations. The number of chlorides in the ligands seemed to affect the efficiency of the complexes while their position had no obvious effect. In addition, all the title compounds were evaluated for plant growth regulation by using the lettuce seedling growth bioassay. The results showed that these kinds of compounds had potential to serve as natural plant growth regulators because of their higher allelopathic activity. This research firstly applied the effective microwave method to synthesize Mg(II) phenoxy carboxylic acid coordination compounds. The design strategy of hydrogen-bonding-driven self-assembly presented here gave a novel insight into the further structural prediction and biofunction achievement of Mg(II) supramolecular assemblies.
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ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Zanyong Zhuang,Xinwen Ou,Jingyuan Li,Yuan Zhou,Zhihong Zhang,Shengfa Dong,Zhang Lin
Abundant salts and complex constituents pose challenges to the enrichment of trace-level uranyl from field water samples. On the basis of the chemical behavior of the uranyl cation in several physical–chemical conditions (in the presence of MgCl2 etc.), we developed a facile and green strategy to improve the uranyl extraction from field water samples, different from the traditional way with organic impregnation. In our systems about nano-Mg(OH)2 treating salt lake brine, when the adsorbent is pretreated with a trace amount of UO22+ ion, the ability to extract uranyl from brine can increase by 2–5 times. The molecular dynamics simulation and time-resolved laser-induced fluorescence spectroscopy analysis show that, in the preadsorption stage, UO22+ ions can steadily bind to the Mg(OH)2 (001) surface because of the interaction with surface hydroxyl groups. When pretreated Mg(OH)2 was exposed to brine, the coordination interaction between the preloaded UO22+ ion and the [UO2(CO3)x(2x–2)–] in solution engenders good selectivity and affinity for uranyl over competitive ions in brine. Besides, the coordination number of UO22+ by carbonate oxygen is large, which further facilitates subsequent adsorption. Such strategy does not introduce other impurities and can apply to metal-oxides-type adsorbents, e.g., TiO2. This study should shed light on further improvement of efficient uranyl extraction from field samples and give insights into the mechanism understanding of uranyl adsorption in real systems.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2017
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IF 4.784
Ziye Ling,Junwan Liu,Qianhao Wang,Wenzhu Lin,Xiaoming Fang,Zhengguo Zhang
MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic has a proper melting point and high latent heat for solar water heating systems with latent heat storage . In this paper, the exact composition of the eutectic and the corresponding phase change temperature are determined by measuring the phase change characteristics of mixtures of MgCl 2 ·6H 2 O and Mg(NO 3 ) 2 ·6H 2 O in various ratios. MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectics, the melting temperature of which is around 58 °C, can be obtained with the mass fraction of MgCl 2 ·6H 2 O ranging from 35% to 50%. The eutectics are composited with porous fumed silica to improve its thermo-physical properties. The eutectic/SiO 2 composite retains a similar melting point of the pure eutectic, is of no liquid leakage even after melting while the SiO 2 weighs more than 15 wt%, and the specific enthalpy reaches 88.13 kJ kg −1 . The eutectic/SiO 2 composite has a thermal conductivity 5% higher than pure eutectics and better thermal stability and cycle stability. The thermogravimetric analysis shows its weight loss is 8.03% less than pure eutectic at 300 °C. And the eutectics suffers a decrease in phase change enthalpy after 100 thermal cycles by 9.2%, much lower compared with the 37.23% for pure eutectics due to the phase separation during the thermal cycles. Thermo-physical properties and stability of MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic have been enhanced by fumed silica.
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Materials Today Communications
·
2024
·
IF 3.7
Xianze Meng,Qianru Zhang,Xuantong Lv,Jiabo Chen,Yingzi Peng,Pengxuan Dong,Qingqing Sun
The corrosion inhibition performance of three amino acids, namely L-Phenylalanine (Phe), L-Methionine (Met) and L-Histidine (His) on 7150 Al alloy in 0.1 M HCl + 1 M NaCl solution was investigated by using electrochemical impedance spectroscopy (EIS), cyclic polarization, DFT and MD simulations. Electrochemical results indicate that all the studied amino acid inhibitors are cathodic type, and the inhibition efficiency follows the following order under all studied temperatures (25, 35 and 45 ℃): His > Met > Phe. A strong correlation between corrosion inhibition efficiency and DFT parameters is not evident, but the adsorption sites (N and O of NH 2 -COOH-, S atom of Met and two N atoms in the imidazolyl ring of His) can be determined by Fukui indices and Mulliken charges of the local atoms. In addition, MD simulations indicate that corrosion inhibition efficiency increases with the decreasing of adsorption energy.
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EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Dan Zhang,Yue Zhao,Qi He,Kaixuan Feng,Zhi Hu,Guohong Ma,Zengxi Pan
Magnesium (Mg) alloys are susceptible to being attacked by corrosive ions in practical application environments, which limits their widespread application as the most promising engineering material. Herein, the superhydrophobic composite coating PVB/STA/ZIF-8@SiO 2 (PSZS) has been designed on the surface of Mg alloy by using a drop coating method to improve its corrosion resistance. In this study, we provide an approachable decoration strategy for hydrophobic and hierarchical modification of zeolite imidazolate frameworks (ZIF-8) with stearic acid (STA) and SiO 2 , and combined with polyvinyl butyral (PVB) to form a composite coating with excellent performance on the substrate surface. Notably, the PSZS composite coating exhibited superhydrophobic and the contact angle is greater than 150° after 300 cm of mechanical friction. The electrochemical testing of the PSZS composite coating indicated that it greatly protected the Mg alloys from corrosion. Moreover, the PSZS coating displayed highly effective corrosion resistance even after being immersed in 3.5 wt% NaCl aqueous solution for 7 days. Overall, the PSZS composite coating with the advantages of corrosion resistance, corrosion durability, superhydrophobic, abrasion resistance and simple preparation process broadens the horizons of Mg alloy corrosion resistance research.
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