Materials
·
2024
·Vol. 17
·期 19
·4895
·
IF 3.1
Lianying Liao,Hao Chen,Chunlin He,Gjergj Dodbiba,Toyohisa Fujita
Boron is a naturally occurring trace chemical element. High concentrations of boron in nature can adversely affect biological systems and cause severe pollution to the ecological environment. We examined a method to effectively remove boron ions from water systems using sugarcane bagasse biochar from agricultural waste with NH3nanobubbles (10% NH3and 90% N2). We studied the effects of the boron solution concentration, pH, and adsorption time on the adsorption of boron by the modified biochar. At the same time, the possibility of using magnesium chloride and NH3nanobubbles to enhance the adsorption capacity of the biochar was explored. The carbonization temperature of sugarcane bagasse was investigated using thermogravimetric analysis. It was characterized using XRD, SEM, and BET analysis. The boron adsorption results showed that, under alkaline conditions above pH 9, the adsorption capacity of the positively charged modified biochar was improved under the double-layer effect of magnesium ions and NH3nanobubbles, because the boron existed in the form of negatively charged borate B(OH)4−anion groups. Moreover, cations on the NH3nanobubble could adsorb the boron. When the NH3nanobubbles with boron and the modified biochar with boron could coagulate each other, the boron was removed to a significant extent. Extended DLVO theory was adopted to model the interaction between the NH3nanobubble and modified biochar. The boron adsorption capacity was 36 mg/g at room temperature according to a Langmuir adsorption isotherm. The adsorbed boron was investigated using FT-IR and XPS analysis. The ammonia could be removed using zeolite molecular sieves and heating. Boron in an aqueous solution can be removed via adsorption with modified biochar with NH3nanobubbles and MgCl2addition.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
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
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Xin Zhang,Song Li,Jie Yuan,Zhongning Shi
The effect of magnesium chloride (MgCl 2 ) on the electrodeposition of zinc in 1,3-dimethyl-2-imidazolidinone (DMI)/ZnCl 2 solvate ionic liquids was investigated. Cyclic voltammetry and Chronoamperometry are employed to study the electrochemical behavior of Zn. The crystal structure, microscopic morphology, and roughness of Zn coatings were measured by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Non-contact Optical Surface Profiler (OSP). The results reveal that adding MgCl 2 is favorable to the electrodeposition of Zn and leads to the formation of a new zinc-containing species in the electrolyte, which was confirmed by Raman spectra. Importantly, this addition does not affect the nucleation mechanism of zinc. Furthermore, the zinc grows preferentially on the (1 0 1) plane and a more smooth and uniform zinc coating was obtained. Corrosion resistance testing is conducted in a 3.5 wt% NaCl solution using the Tafel method. Coatings obtained at 4 mA/cm 2 and 343 K with 0.1 mol/L MgCl 2 addition exhibit lower corrosion current density of 38.10 μA/cm 2 compared to zinc coatings obtained without MgCl 2 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Chunhua Zhang,Jiahui Shen,Ji Li,Mei Wan
To study the inhibition characteristics of different chloride salts on the spontaneous combustion of coal and to further reveal why magnesium chloride shows a different inhibitory effect, coal samples from FuSheng Coal Mine No. 15 in Shanxi Province were selected. Based on the characteristics of functional group absorption peak at different temperature, the composition changes and reactivity ranking of the functional groups in oxidized coal samples were tested by thermal oxidation experiments and infrared spectroscopy and analyzed to obtain the chain thermal reactions of different active groups. The weight-loss process and heat release characteristics of raw coal and three chloride salt-containing coal samples (sodium chloride, potassium chloride, and magnesium chloride) were compared and analyzed by synchronous thermal analysis experiments, and their inhibition reaction mechanism were studied. The results showed that different functional groups reacted at different low-temperature stages, and the active groups containing C–H, O–H, C-O, and C = O bonds were important during the spontaneous combustion of coal. In the chain thermal reactions with different active groups, heat and oxidative cleavage of the C-O and O–H bonds determined the chain development of different functional groups, and the R·, RO·, H·, and ·OH, chain thermal reaction products again acted as reactants that promoted further development of the reaction. Sodium chloride and potassium chloride played inhibitory roles in the dehydration-desorption stage and dynamic equilibrium stage through water evaporation and heat absorption, while magnesium chloride participated in the whole coal-oxygen reaction process. The inhibitory mechanism included dehydration and heat absorption by MgCl 2 ·6H 2 O, the complex dehydration of active groups containing O–H, the precipitation and oxygen insulation of [(SH·) n ]Mg and Mg(OH) 2 , the nucleophilic substitution of α-H for RCH 3 and RCH 2 OH groups, and the formation of H…Cl…H bonds.
研究领域:
化学工程
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能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2021
·
IF 0
Yang Hu,George Z. Chen,Lin Zhuang,Zhiyong Wang,Xianbo Jin
Artificial N 2 fixation is one of the most important industrial processes for human beings. However, the current Haber-Bosch process based on fossil fuel suffers from unsustainability and a low N 2 to NH 3 conversion. Here, we report a magnesium chloride cycle for the synthesis of NH 3 from N 2 and H 2 O at atmospheric pressure. In this cycle, N 2 reacts with Mg to form Mg 3 N 2 . Mg and Cl 2 are produced by the electrolysis of molten MgCl 2 . NH 4 Cl is used to hydrogenolyze Mg 3 N 2 to produce NH 3 , with anhydrous MgCl 2 being regenerated. The cycle is closed via the reverse Deacon reaction to convert Cl 2 to HCl, which is captured as NH 4 Cl with the recyclable NH 3 . This indirect electrosynthesis produces NH 3 at an industry-acceptable rate with zero CO 2 emission, a coulombic efficiency >92%, and an energy consumption of ∼14.1 kWh/kg-NH 3 .
研究领域:
化学工程
·
环境科学
·
工业催化
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yan Ouyang,Yanpeng Guo,Dian Li,Yaqing Wei,Tianyou Zhai,Huiqiao Li
The dendritic lithium formation and sustained lithium consumption caused by the uncontrollable side reactions between lithium and electrolytes seriously restrict the applications of lithium anodes in high-energy density batteries, especially in carbonate electrolytes. Ameliorating the surface status of lithium anodes is critical for modulating lithium deposition behavior and improving the cycling stability of lithium metal batteries. Herein, magnesium chloride salt is first reported as a carbonate electrolyte additive for lithium surface modification by in situ reaction. It is proved that both Cl– and Mg2+ play important roles in building a stable electrode/electrolyte interface with a fast Li+ diffusion property. The coexistence of inorganic LiCl and metallic Mg species in the interface can effectively decrease the surface side reactions, lower interphase resistance, promote Li ions diffusion, and result in uniform lithium deposition. The electrochemical tests show that the reversible utilization rate of lithium for Li/Cu asymmetrical cells increases by 10% and the polarization of Li/Li symmetrical cells is reduced noteworthily with such an additive. Furthermore, a significant improved cycling performance of Li/Li4T5O12 full cells is also achieved.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Zeyang Kang,Yaohui Shi,Hui Liu,Xiangyang Liu,Maogang He
Electrical generators transducing and concentrating solar power to heat and then to electricity require a material with good thermophysical properties to store heat when there is no sunlight. Here, LiCl-KCl-ZnCl 2 and LiCl-KCl-MgCl 2 were observed for their capacity to store energy by the change in sensible heat content as a function of temperature. The ternary phase diagrams of the two salts were predicted using a thermodynamic model . Three eutectic points for LiCl-KCl-ZnCl 2 and four eutectic points for LiCl-KCl-MgCl 2 were predicted and experimentally verified. The heat capacity and thermal stability of the seven eutectic mixtures were measured to evaluate their heat storage capacity and operating temperature range. LiCl-KCl-ZnCl 2 (13.86 % mol-40.63 % mol-45.51 % mol) and LiCl-KCl-MgCl 2 (47.29 % mol-44.33 % mol-8.38 % mol) were found to be the best choices for heat storage materials, which have low melting points of 451.8 K and 612.8 K, large heat capacity of 1.25 J/g·K and 1.80 J/g·K, and wide operating temperature range from room temperature to higher than 823 K, respectively.
研究领域:
材料科学
·
热力学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 17
·2412322
·
IF 12.1
Xuesheng Su,Dongdong Li,Qiang Xie,Bingxin Yang,Haolin Wang,Heng Chen,Zhiqiang Li,Tao Chen,Ru Zhou
The quasi-1D antimony selenosulfide (Sb 2 (S,Se) 3 ) light-harvesting material has attracted tremendous attention for photovoltaic applications because of its superior materials and optoelectronic properties. However, one of the critical obstacles faced by Sb 2 (S,Se) 3 solar cells is the presence of many defects in absorbers, especially those deep-level anion-vacancy defects which are prone to serving as recombination centers. In this work, an effective defect engineering strategy via magnesium chloride (MgCl 2 ) postgrowth activation is explored for high performance antimony selenosulfide solar cells. Through careful characterization of structural, morphological, and defect properties, as well as the photovoltaic performance, complemented with firs-principle calculations, it is revealed that this postgrowth activation step enables the effective passivation of deep-level anion-vacancy defects via electrical chloride-doping, the recrystallization of small grains for producing large-grained films, and the formation of favorable cascade energy levels to promote the charge transport. Benefitting from suppressed charge recombination and facilitated charge transport, the Sb 2 (S,Se) 3 solar cells yield a considerable power conversion efficiency of 10.55%, which is among the top efficiencies reported for antimony chalcogenide solar cells. This study underscores the significance of anion-vacancy passivation for efficient antimony chalcogenide devices.
研究领域:
材料科学
·
光伏技术
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Yufei Han,Wenguang Zhou,Xinyan Sun,Xiangming Kong,Jianzhang Li
Magnesium oxychloride cement (MOC) is a promising substitute for formaldehyde-based adhesives for wood bonding due to its low carbon footprint, formaldehyde-free and flame-retarding natures. However, the poor water resistance and weak interfacial compatibility with wood limits their practical applications. Herein, inspired by mussels, we reported an eco-friendly and versatile strategy to develop MOC-based wood adhesive with desirable water resistance, high adhesive strength and strong bonding interface. Amino-functionalized sepiolite (KSep) was selected as the nano fillers and inorganic fibers to enhance the structural compactness and resist cracks propagation of MOC. Gallic acid (GA) was employed as the crosslinking agent to induce multiple reinforcement network based on phenol-amine crosslinking and ion chelation in MOC system. The synergy of inorganic fiber enhancement and multiple reinforcement network not only strengthens the cohesive properties, but also enhances the physical anchorage and chemical reactions at the bonding interface, thus endowing MOC with outstanding adhesion ability to wood. The MOC/KSep/GA composite exhibits dry and wet shear strength of 2.63 MPa and 1.75 MPa, being respectively 14.85 % and 42.28 % higher than those values of the pristine MOC. This strategy provides a new route for the development of high-performance cementitious materials and adhesives.
研究领域:
材料科学
·
化学工程
·
胶黏技术
·
可持续化学
✓ 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）