TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2024
·
IF 4.7
Qiang WANG,Meng WANG,Zong-yu FENG,Yong-qi ZHANG,Xiao-wei HUANG,Xiang-xin XUE
For a highly efficient recycling of a wastewater containing a high concentration of MgCl 2 , Al(III) and P507 were scheduled to be removed in advance. In this study, the in-situ removal of Al(III) and P507 from a high concentration MgCl 2 solution at different pH values and Al/P molar ratios was investigated. The results showed that P507 formed organic complexes of Al x (OH) z + y -P507 at pH of 2.0−4.0. At pH of 4.0−5.0, Al(III) precipitated and transferred into Al(OH) 3 with a flocculent amorphous morphology. Active sites on the Al(OH) 3 surface enhanced the removal efficiency of P507. At pH of 6.0−6.5, Al(III) and Mg(II) formed layered crystalline Al(OH) 3 and MgAl 2 (OH) 8 with small pore channels and fewer active sites, resulting in a reduced removal efficiency of P507. When the Al/P molar ratio exceeded 13 and the pH was between 4.0 and 5.0, the removal rates of both Al(III) and P507 were higher than 98%, while the concentration loss of Mg(II) was only 0.2%−0.9%.
研究领域:
环境科学
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化学工程
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2014
·
IF 5.03
Gang Li,Binbin Zhang,Xiang Li,Yuan Zhou,Qingguo Sun,Qiang Yun
The preparation, characterization and modification of eutectic hydrate salt (CaCl 2 ·6H 2 O–MgCl 2 ·6H 2 O) as a new phase change material (PCM) were investigated in this paper. CaCl 2 ·6H 2 O was prepared using industrial grade calcium chloride (CaCl 2 ), and then 10, 15, 20 and 25 wt% MgCl 2 ·6H 2 O was added into CaCl 2 ·6H 2 O respectively in order to obtain CaCl 2 ·6H 2 O–MgCl 2 ·6H 2 O eutectic hydrate salt PCM. The modification of CaCl 2 ·6H 2 O-25 wt% MgCl 2 ·6H 2 O material was designed by a uniform experimental method to select the efficient nucleating and thickening agents. The results show that SrCl 2 ·6H 2 O and SrCO 3 can be effective nucleating agents , and hydroxyethyl cellulose (HEC) is an excellent thickener. For CaCl 2 ·6H 2 O-25 wt% MgCl 2 ·6H 2 O material with 3 wt% SrCl 2 ·6H 2 O, 1 wt% SrCO 3 and 0.5 wt% HEC, the supercooling is reduced to 2 °C, and its phase change temperature and latent heat are 21.4 °C and 102.3 J/g, respectively.
研究领域:
材料科学
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储能技术
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热能工程
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
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IF 1.5
Sun Jiaqi,Peng Yaru,Chen Zeng
Applications of the molten salt electrodeposition method have attracted researcher’s attention in the preparation of magnesium-based alloys in the past decades. Sometimes, hot corrosion occurs on the surface of a metal electrode in molten salt. Here, the corrosion of a Ni electrode and its effect on the electrochemical formation processes of Mg-Ni alloys were studied in LiCl-KCl-MgCl 2 molten salt under an Ar atmosphere. Immersion experiments and some electrochemical experiments, such as cyclic voltammetry (CV), open-circuit chronopotentiometry (OCP), and potentiostatic electrolysis, were carried out to investigate the performance of a Ni metal electrode in LiCl-KCl-MgCl 2 molten salt. Hot corrosion of the Ni electrode became serious with the addition of MgCl 2 , and MgO was deposited on the surface of the Ni sheet. The CV and OCP experiments showed that the water introduced from outside had serious effects on the electrochemical reaction processes in this experiment. Corrosion of the Ni substrate was dynamically and thermodynamically inhibited in the electrochemical formation processes of Mg-Ni alloys. However, there was a small amount of MgO in the Mg-Ni alloys, and corrosion of the Ni sheet showed obvious effects on the morphology of Mg-Ni alloys
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Ling Yu,Kuiling Li,Yong Zhang,Jun Wang,Guoliang Zhang
Development of acid resistant nanofiltration membranes (ARNFMs) with high metal rejection, high flux and low molecule weight cut-off (MWCO) remains a big challenge. The separation performance of polyamine ARNFM is partially limited by the dense structure caused by the high concentration of organic phase solution. Herein, in this work, a novel effective post-treatment of citric acid (CA) was utilized to further improve the separation property of dually charged polyamine ARNFMs with low MWCO. An appropriate CA post-treatment (1.5 mol/L, 30 min, 65 °C) could gently remove off the oligomers and CA molecules would react with the redundant protonated/non-protonated amino, imine and hydroxyl groups of the polyamine NFM. Therefore，after the post-treatment, the membrane flux was enhanced 7.1 times with a high MgCl 2 rejection (97.6%) and a low MWCO around 220 Da. Furthermore, CA post-treatment not only had no significant influence on the acid stability of this membrane, but would also protect the membrane from the drastic effect of HCl (hydrolyze -Cl into –OH) in turn. All the results indicated that CA post-treatment has positive effects on polyamine ARNFMs, and the resulted dually charged polyamine ARNFMs have a good application potential for acidic wastewater treatment .
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
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IF 7.3
Wendi Lai,Caixing Wang,Rui Fang,Kanghui Liu,Wei Yang,Guowang Diao,Yanrong Wang
Compared to conventional organic electrolytes, aqueous magnesium-ion batteries (AMIBs) have emerged as a research hotspot due to their superior safety, environmental compatibility, and cost-effectiveness. However, the further development of AMIBs has been impeded by their short cycling lifespan, primarily caused by the aqueous corrosion of Mg anodes in water-containing electrolytes, which generates inorganic passivation layers (e.g., Mg(OH)2 and MgO) on the anode surface. To address this challenge, we propose a collaborative two-pronged approach, involving the adoption of a novel electrolyte system (saturated MgCl2 aqueous solution containing 25 vol % PEG, SMP-3) and the use of a Mg alloy anode. Electrochemical investigations suggest that the PEG molecules form hydrogen bonds with H2O molecules, effectively suppressing water activity and thereby enhancing anode stability. The assembled PTO/Mg alloy full cell exhibited a stable discharge plateau at 1.5 V with an initial discharge capacity of 176.24 mAh g–1 at 200 mA g–1. Remarkably, the cell demonstrated exceptional cycling stability, maintaining a capacity of 150 mAh g–1 after 300 cycles (85% capacity retention), with an average Coulombic efficiency approaching 100%. The results demonstrate the feasibility of stabilizing Mg alloy anodes through an interfacial engineering strategy based on a water-in-salt electrolyte design. This strategic approach provides a novel pathway for developing low-cost, high-performance AMIBs.
研究领域:
电化学
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储能
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材料科学
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电池技术
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DOI
高影响因子
Materialia
·
2023
·
IF 3.4
Dzi Shing Aaron Lau,Herng Ee Chieng,Chenmin Wang,Zhaoyang Li,Xiaoting Zhang,Dick Ho Kiu Chow,Ling Qin,William Weijia Lu
Calcium sulfate/phosphate cement (CSPC) is a calcium-based bioactive material which is degradable and used to repair bone defects, however, it is not recommended for patients with poor bone health due to the mismatch of time of bone regeneration and cement degradation. Previous studies suggested the addition of Magnesium (Mg) is a possible solution to enhance the performance of CSPC as Mg ions are beneficial to osteogenesis. However, the impact on bone healing induced by Mg is subtle since Mg 2+ ions regulate both osteoblastic and osteoclastic activities. This study examined the healing effect of pure Mg-enriched CSPC (Mg-CSPC) and magnesium chloride (MgCl 2 ) enriched CSPC (MC-CSPC). Mg-CSPC showed sustained release of Mg 2+ whereas MC-CSPC exhibited spike release of Mg 2+ and led to a higher rate of degradation. In vivo study in ovariectomized (OVX) rat model indicated a longer time of degradation in Mg-CSPC, which fully degraded at postoperative week 8. Mg-CSPC contained interconnective pores which allowed cell migration from the outer layers to the core of the cement and improved osteoinduction. On the other hand, MC-CSPC was fully degraded in less than 4 weeks after surgery and replaced by newly formed bone. In this study, MC-CSPC demonstrated a significantly higher rate of bone regeneration than Mg-CSPC and the optimum rate of bone regeneration was between weeks 4 to 7 after cementoplasty. Both histological and quantitative micro-CT analysis suggested MC-CSPC produced a higher quality of new bones and positively affected the surrounding bones. Taken together, this study suggests a fast release of Mg-contained scaffold is preferable for bone repair and the healing effect is continued even after complete degradation.
研究领域:
生物医学工程
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材料科学
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骨科
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DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Guangshui Tu,Chong Wang,Shengyou Chen,Qian Wang,Zhenxue Liu,Haotian Zhou,Chunyu Feng,Handou Zheng,Haiyang Gao
Heterogeneous catalysts have long dominated polyolefin production, the immobilization of a pyridylamido hafnium catalyst is highly challenging because of its unique in-situ ligand modification mechanism. Here, we report a heterogeneous pyridylamido hafnium catalyst immobilized on a dual MgCl 2 /Al i Bu n (2-ethyl-1-hexoxide) 3-n activator/support for slurry homo- and copolymerization of 4-methyl-1-pentene (4MP). The supported pyridylamido hafnium catalyst shows enhanced catalytic activity and excellent polymer morphology control toward homopolymerization of 4-methyl-1-pentene. The produced poly(4-methyl-1-pentene)s show high isotacticity (>99%) and high melting temperatures up to 230 °C, and have normal molecular weight distribution. The heterogeneous catalyst still remains the advantages of enhanced catalytic activity and excellent polymer morphology control during the copolymerization of 4MP and α-olefins. Both the incorporation of α-olefin and longer chain α-olefins can improve the resilience of PMP materials.
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高影响因子
JOURNAL OF FOOD PROCESS ENGINEERING
·
2026
·Vol. 49
·期 5
·e70567
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IF 3.5
Fan Zhang,Shaofeng Yuan,Hang Yu,Weirong Yao,He Qian,Yuliang Cheng
Whole soybean tofu, free of okara byproduct, has gained popularity for higher utilization rate of raw material and lower production cost compared to traditional tofu. In this study, whole soybean pressed tofu samples induced by four co-coagulants were prepared by ultrafine grind treatment combined with high-pressure homogenization to the soymilk. The synergetic usage of CaSO 4 and MgCl 2 significantly enhanced the gel strength with 2.01 and 0.66 N, respectively, compared to individual coagulant. This could be attributed to the different mechanisms of CaSO 4 and MgCl 2 in the gelation process. Furthermore, tofu samples with continuous amounts increase/decrease of CaSO 4 /MgCl 2 formed different physicochemical and textural characteristics. Relaxation times measured by nuclear magnetic resonance indicated water moisture gradually decreased with the reduce of T22 component to the minimum of 81.81%. Moreover, chemical interactions analysis showed the proportion of disulfide bonds increased with the amounts of both coagulants, to a maximum of 40.60% with 4.5‰ CaSO 4 /0.5‰ MgCl 2 added, and then decreased. Correlation analysis confirmed proportion of disulfide bonds showed a positive correlation with gel strength, textural characteristics and β-sheet proportion in the protein secondary structure, furtherly testifying the transformation from α-helix to β-sheet led to the changes of chemical interactions and thus affecting tofu properties.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Tao Guo,Qi Zhou,Yuming Chen,Wei Li,Peng Liang,Jingdai Wang,Yongrong Yang
The preparation of ultra-high-molecular weight polyethylene (UHMWPE) with few entanglements and a fine particle size remains a significant problem for academia and industry. In this research, a novel MgCl2-based heterogeneous Ziegler–Natta catalyst modified with polyhedral oligomeric silsesquioxane (4-OH POSS) of fine particle size was successfully synthesized by screening solvents and Grignard reagents. Scanning electron microscopy, high-angle annular dark-field imaging, diffuse reflectance infrared spectroscopy, and X-ray photoemission spectroscopy tests were utilized to analyze the macroscopic morphology, microscopic composition, and active site distribution of the catalyst. Numerous POSS nanocrystals were stably embedded on the catalyst surface, and TiCl4 active sites are prone to immobilization on the POSS nanocrystals. However, TiCl4 loaded on the POSS nanocrystals exhibits nearly no activity, which acts as the isolator for separating the active sites loaded on the δ-MgCl2 surface. The isolation effect of POSS nanocrystals and the increased crystallization behavior of non-porous features for the catalyst collectively lead to the preparation of weakly entangled UHMWPE. The effects of sensitivity of cocatalyst reducibility, TiCl4 loading contents, and polymerization temperature on the catalytic activity and the UHMWPE performance were explored. Interestingly, the UHMWPE with less entanglements (initial elastic modulus = 0.23 MPa) and fine particle size (∼110 μm) was synthesized, exhibiting the overall reinforced strength/stiffness/toughness balance.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ENERGY
·
2023
·
IF 9
Siyu Zeng,Zhenyuan Yin,Junjie Ren,Dnyaneshwar R. Bhawangirkar,Li Huang,Praveen Linga
Oceanic hydrate-based CO 2 sequestration (HBCS) holds great promise for achieving carbon neutrality. However, the presence of inorganic salts, particularly MgCl 2 besides NaCl, in seawater can significantly impact the formation rate and the stability of CO 2 hydrate. In this study, experimental investigations were conducted to examine the thermodynamics, kinetics, and the resulting morphological features of CO 2 hydrate in the presence of MgCl 2 , covering mass fractions ranging from 0 to 5.0 wt%. The experimental findings reveal that MgCl 2 exerts a thermodynamic inhibitory effect with its inhibitory capacity increasing with higher mass fractions. The solubility model of CO 2 in MgCl 2 solution was modified, demonstrating a gradual weakening of CO 2 solubility as MgCl 2 mass fraction increases. Additionally, the growth kinetics of CO 2 hydrate decreases with increasing MgCl 2 mass fraction. Regarding CO 2 hydrate morphology, it was observed that at low mass fractions of MgCl 2 (<1.0 wt%), a dense hydrate film rapidly formed at the gas-liquid interface after CO 2 hydrate nucleation, hindering the further conversion of CO 2 into hydrate. Conversely, at higher mass fractions (>3.0 wt%), CO 2 hydrate exhibits a more porous and slurry-like structure, facilitating more gas-liquid contact and mass transfer, thereby enhancing the conversion of CO 2 into hydrate. During hydrate dissociation , a salt-removal effect associated with CO 2 hydrate formation was observed, leading to the accumulation of concentrated electrolyte (MgCl 2 ) and facilitating CO 2 hydrate dissociation. These findings have implications for understanding the CO 2 hydrate formation and dissociation in the presence of MgCl 2 relevant in the subsea environment and can contribute to the development of effective hydrate-based CO 2 sequestration strategies.
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ACS Catalysis
·
2025
·
IF 13.1
Wei Li,Tao Guo,Zaitian He,Jingdai Wang,Yongrong Yang
Investigating the correlation between the active center structure and chain structures of the synthesized polyethylene in Ziegler–Natta catalysts has remained a persistent challenge due to the diversity and complexity of their active sites, limiting the development of advanced catalysts for the synthesis of high-performance polyethylene. Here, we present a strategy for the stepwise removal of active species in classical ZN catalysts. The reaction product formed between disilanolisobutyl polyhedral oligomeric silsesquioxane (2OH-POSS) and TiCl4 is successfully separated from the original catalyst by exploiting the solubility of 2OH-POSS in n-hexane, achieving a significant reduction in titanium content from 10.2 wt % to just 0.77 wt %. Advanced spectroscopic characterizations (e.g., EPR, CO-FTIR, and UV–vis) reveal a synergistic interplay between MgCl2 lattice reorganization and titanium removal during this detitanation process. As detitanation progresses, residual active Ti species on the MgCl2 surfaces facilitate the formation of isolated Ti3+ sites. More significantly, this process dramatically enhances the formation of dormant active species, achieving the maximum content of 24.56 wt %. The catalysts enriched with dormant active species enhance the uniformity of the short-chain branching distribution in synthesized ethylene/1-hexene copolymers. Notably, upon hydrogen introduction during ethylene polymerization, these dormant-species-enriched catalysts simultaneously reduce the polyethylene molecular weight while unexpectedly enhancing the activity by 52.9%, representing the first report of such coupled effects in the ethylene polymerization of Ziegler–Natta catalysts.
研究领域:
高分子化学
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催化化学
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材料科学
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聚合物合成
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配位聚合
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表面化学
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多相催化
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Qiang Wang,Haiqing Hao,Zhengyang Wu,Meng Wang,Zongyu Feng,Yongqi Zhang,Xiangxin Xue,Xiaowei Huang
The MgCl 2 wastewater generated from rare earth extraction and separation process was treated by spray pyrolysis with H 2 O 2 as an additive for the first time, and achieving full recycling of MgCl 2 wastewater. The effect of H 2 O 2 on the spray pyrolysis process, the kinetic of the spray pyrolysis process, and the mechanism of the effect on the activity of MgO powder were investigated. The results showed that H 2 O 2 and the O 2 produced by its decomposition had strong oxidizing property, which contributed to the removal of Cl roots. The kinetic results indicated that the rate determining step of MgCl 2 spray pyrolysis was transformed from chemical reaction to diffusion process after the temperature exceeded 1023 K. The activity study indicated that the doping of Cl led to severe distortion of the MgO grains, and polycrystalline basic magnesium chloride had more defect sites too. Thus, the powder showed high activity. Moreover, the thermal decomposition rate of MgCl 2 reached 99.83 %, the alkalinity of the powder reached 0.044 mol/g, and the iodine absorption value reached 131.81 mg I 2 /g MgO at temperature of 1073 K and amount of H 2 O 2 addition of 1 %. Meanwhile, the high purity hydrochloric acid with concentration of 6.54 mol/L was obtained.
研究领域:
化学工程
·
环境科学
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产品关联
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高影响因子
危险品化学品经营许可证（带存储）