Green Energy & Environment
·
2023
·
IF 13.3
Changjian Yuan,Xianglei Liu,Xinrui Wang,Chao Song,Hangbin Zheng,Cheng Tian,Ke Gao,Nan Sun,Zhixing Jiang,Yimin Xuan,Yulong Ding
Solar thermochemical energy storage based on calcium looping (CaL) process is a promising technology for next-generation concentrated solar power (CSP) systems. However, conventional calcium carbonate (CaCO 3 ) pellets suffer from slow reaction kinetics, poor stability, and low solar absorptance. Here, we successfully realized high power density and highly stable solar thermochemical energy storage/release by synergistically accelerating energy storage/release via binary sulfate and promoting cycle stability, mechanical strength, and solar absorptance via Al–Mn–Fe oxides. The energy storage density of proposed CaCO 3 pellets is still as high as 1455 kJ kg −1 with only a slight decay rate of 4.91% over 100 cycles, which is higher than that of state-of-the-art pellets in the literature, in stark contrast to 69.9% of pure CaCO 3 pellets over 35 cycles. Compared with pure CaCO 3 , the energy storage power density or decomposition rate is improved by 120% due to lower activation energy and promotion of Ca 2+ diffusion by binary sulfate. The energy release or carbonation rate rises by 10% because of high O 2− transport ability of molten binary sulfate. Benefiting from fast energy storage/release rate and high solar absorptance, thermochemical energy storage efficiency is enhanced by more than 50% under direct solar irradiation. This work paves the way for application of direct solar thermochemical energy storage techniques via achieving fast energy storage/release rate, high energy density, good cyclic stability, and high solar absorptance simultaneously.
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高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Bo Li,Haijun Guo,Zhen Xiong,Lian Xiong,Shimiao Yao,Mengkun Wang,Hairong Zhang,Xinde Chen
γ-valerolactone (GVL) is a sustainable chemical, which can be obtained by hydrogenation of levulinic acid (LA) and levulinate. Herein, we reported a solvent-free hydrogenation of butyl levulinate (BL) to GVL and 1,4-pentanediol (1,4-PDO) over a skeletal Cu-Al-Zn catalyst. The skeletal Cu-Al-Zn catalyst was prepared from Devarda's alloy by alkali leaching and the catalyst was characterized by different analysis methods. The aluminum in the Devarda's alloy was dissolved by sodium hydroxide in the leaching process and many active Cu atoms were generated on the catalyst surface and the skeletal Cu-Al-Zn exhibited many micrometer-scale irregular particles with rough surface. The skeletal Cu-Al-Zn catalyst showed the excellent performance in the solvent-free hydrogenation of BL to GVL under constant hydrogen pressure (5 wt% catalyst loading, 180°C, 6 MPa of H 2 , 6 h): the LA conversion was 100%, the GVL yield was 74.75% and the 1,4-PDO yield was 25.63%. Moreover, the catalyst showed stable performance and it was reusable up to 5 times without apparent loss of activity. A stable hydrogen pressure with Zn would suppressed the dehydration of 1,4-PDO.
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高影响因子
FUEL
·
2023
·
IF 7.4
Xinjian Zhou,Ruixuan Xu,Hongqi Nie,Qilong Yan,Jun Liu,Yunlan Sun
Burning rate modulation is a crucial but challenging technology for designing solid propellants. The core–shell structured Al@AP and Al@AP/CuO were prepared and their thermal reaction properties were investigated at different pressures. The precise catalytic mechanism of doped CuO in oxidizer and the key reason for its burning rate modulating effect on solid propellants were elucidated by combining DFT calculations. The *NH 4 ClO 4 on the CuO (1 1 1) surface is more likely to undergo a dehydrogenation reaction first. The large difference in activation energy between *NH 4 ClO 4 →*NH 3 +*ClO 4 +*H and *NH 4 ClO 4 → NH 3 + HClO 4 explains the reasons that CuO can reduce the ignition delay of the Al@AP. CuO promotes the decomposition of the AP@Al at the low- and high-temperature decomposition (LTD and HTD) stage. For the Al@AP-CuO, the temperature of the high-temperature decomposition peak (THTD) does not shift to the lower temperature range with increasing pressure. These results are responsible for a reduction of pressure exponent in the presence of minor CuO as reported in the literature. CuO can facilitate the transformation process *NH 3 →*NH 2 on the CuO (1 1 1) surface at low-temperature and low-pressure conditions. However, at high-temperature and high-pressure conditions, it can inhibit the reaction *NH 2 →*NH→*N, so the burning rate of solid propellants can be controlled.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yongli Sun,Xiang Gao,Na Yang,Xiaowei Tantai,Xiaoming Xiao,Bin Jiang,Luhong Zhang
With the aim of simultaneously achieving synthesis and morphology control of three-dimensional (3D) hierarchical layered double hydroxide (LDH) by more efficient and environmentally friendly methods, a facile and cost-efficient double-drop coprecipitation method was creatively applied to fabricate 3D flowerlike microstructures (Al2O3-MgAl-LDHs) using γ-Al2O3 as a sacrificial template. The morphology evolution process and growth characteristics of Al2O3-MgAl-LDHs were investigated in detail, revealing that γ-Al2O3 not only provides an effective support for the crystal growth of LDH but also is involved in the LDH layer formation process through self-decomposition. More importantly, LDH morphologies can be regulated by varying the reaction conditions, such as the γ-Al2O3 concentration, Mg2+/Al3+ molar ratio, and pH. Additionally, a possible formation mechanism for 3D hierarchical flowerlike Al2O3-MgAl-LDHs was illustrated. Remarkably, owing to the high specific surface area and low/medium/high-strength basic sites, the as-obtained LDH after calcination exhibited excellent catalytic activity and reusability in the transesterification of glycerol with dimethyl carbonate.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Yongcun Song,Songyan Wang,Li-Ye Yang,Di Yu,Yang-Guang Wang,Xiao-kun Ouyang
In this study, a MT(Al)/calcium alginate [MT(Al)@CA] microsphere structure was prepared using sodium alginate (SA) and MT(Al). In order to achieve [MT(Al)@CA] microspheres with a high stability and chemical resistance, glutaraldehyde was used as the crosslinking agent to graft the microspheres and ethylenediamine (ED) into a new type of ED-functionalized MT(Al)@CA microsphere structure similar to a core–shell-type structure [MT(Al)@CA-ED]. This core–shell/bead-like structure was characterized and analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The adsorption performance of the core–shell/bead-like structure for As(V) in solution was studied. The effects of the initial As(V) concentration, reaction time, pH, and different reaction temperatures on the reaction process were studied. The results indicate that at a pH of 4, the removal rate of As(V) by the core–shell/bead-like MT(Al)@CA-ED could reach 94.85% after 150 min. The adsorption process is highly consistent with the Langmuir isotherm model (R 2 = 0.9983) and pseudo-second-order kinetic model (R 2 = 0.9973). The maximum adsorption capacity could reach 61.94 mg/g. Regeneration experiments showed that the adsorption efficiency of As(V) after six cycles was >80%.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yaoming Deng,Tianxing Kang,Zhen Ma,Xinxin Tan,Xiaona Song,Zheng Wang,Peipei Pang,Dong Shu,Xiaoxi Zuo,Junmin Nan
Under the abusive conditions, it is demonstrated that the thermal stability of LiCoO 2 and the safety of LiCoO 2 /graphite batteries are improved by doping and coating Al and Ti elements into the bulk structure and surface of LiCoO 2 . The trickle charge and the differential scanning calorimeter (DSC) results show that after coating Al and Ti oxides on the doped LiCoO 2 with 2000 ppm Al, the exothermic peak shifts to a higher temperature and the exotherm decreases, resulting in the increase of the thermal stability of LiCoO 2 . In addition, compared to the LiCoO 2 without Al doping, it is also indicated that the thermal stability of LiCoO 2 can be enhanced by doping Al, the exothermic peak of the LiCoO 2 with Al doping amount of 10000 ppm is up to 250 °C. Under the abusive testing conditions including thermal shock and overcharge, the safety evaluation results of pouch polymer LiCoO 2 /graphite batteries are in good agreement with the trickle charge and DSC results. These results reveal that the thermal stability of LiCoO 2 can be used as an indicator to evaluate the safety characteristics of LiCoO 2 /graphite batteries, and especially the introduction of Al and Ti into LiCoO 2 can effectively improve the safety of LiCoO 2 /graphite batteries under the abusive conditions.
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Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 10
·2657-2665
·
IF 5.106
Hongwei Pang,Yihan Wu,Shuyi Huang,Congcong Ding,Shun Li,Xiangxue Wang,Shujun Yu,Zhongshan Chen,Gang Song,Xiangke Wang
In the past few decades, uranium (235, 238U(VI)) has turned into a forefront environmental issue due to its extensive use in the nuclear industry and its toxicity and radioactivity. Herein, nanoscale zero valent iron (nZVI), which was supported on Ca–Mg–Al-layered double hydroxide (Ca–Mg–Al-LDH/nZVI), was fabricated via an in situ growth route and employed for U(VI) decontamination from aqueous solutions. Spectroscopy and microscopy (SEM, TEM, FTIR, XRD, BET, and XPS) technologies were applied for the investigation of the properties of Ca–Mg–Al-LDH/nZVI and the U(VI) elimination mechanism. Ca–Mg–Al-LDH/nZVI had a remarkable BET surface (426.8 m2 g−1), abundant functional groups (i.e., Fe–O, Al–O, –OH, etc.), high efficiency (4 h to achieve equilibrium) and large adsorption capacities (Qmax = 216.1 mg g−1) for U(VI) removal. The decontamination process of U(VI) was observed to be pH-dependent and ionic strength-independent, suggesting that the adsorption was predominated by inner-sphere surface coordination. XPS spectroscopy analyses indicated that the reduction and adsorption of nZVI and the adsorption of Ca–Mg–Al-LDH dominated U(VI) elimination on Ca–Mg–Al-LDH/nZVI. The environmentally friendly synthesis method, excellent physicochemical properties and remarkable removal performance suggested that Ca–Mg–Al-LDH/nZVI was applicable as a potential adsorbent for U(VI) decontamination from wastewater in environmental pollution remediation.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Cai Jianguo,Zhang Yanyang,Qian Yue,Shan Chao,Pan Bingcai
A novel nanocomposite bead LaLiAl-LDH@201 was fabricated by doping a small amount of La into nanocrystalline Li/Al layered double hydroxides (LDHs) pre-confined inside polystyrene anion exchanger D201 (LiAl-LDH@201). A systematic characterisation of the resultant LaLiAl-LDH@201 (XRD, SEM-EDS, TEM-EDS, and XPS) evidenced the successful incorporation of La into the Li/Al LDHs, with their interlayer distance expanded to allow more exchangeable sites for fluoride uptake. The resultant LaLiAl-LDH@201 showed high and stable defluoridation performance over a wide range of pH from 4 to 9. The superior uptake capacity and affinity for fluoride of LaLiAl-LDH@201 over LiAl-LDH@201 were driven by both the increased anion exchange capacity of the embedded LDHs and the specific La-F interaction evidenced via XPS and TEM-EDS characterisation. Fixed-bed column test confirmed that the working capacity of LaLiAl-LDH@201 for defluoridation of authentic fluoride-rich groundwater was nearly twice that of LiAl-LDH@201. The fluoride-loaded LaLiAl-LDH@201 could be conveniently regenerated in situ by using NaOH + NaCl binary solution, achieving desorption efficiency above 98%. Moreover, negligible capacity loss, La leaching, or structure alteration was observed after five adsorption-regeneration cycles, indicating the high stability of LaLiAl-LDH@201. Therefore, the novel millisphere nanocomposite LaLiAl-LDH@201 was promising for efficient defluoridation from water and wastewater.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Tianhang Zhang,Timothy Daniel Christopher,Saifang Huang,Yan’gai Liu,Wei Gao,Tilo Sӧhnel,Peng Cao
In this work, pressureless sintering (PLS) method was used to prepare Li 7 La 3 Zr 2 O 12 based Al-free garnet electrolytes with the substitution of tantalum (Ta). A series of Ta-doped lithium garnets Li 7- x La 3 Zr 2- x Ta x O 12 (LLZTO, x = 0, 0.25, 0.5, 0.75 and 1.0) were prepared, and the effect of Ta on the structure, densification and ionic conductivity was investigated. Both relative density and ionic conductivity of the LLZTO pellets are dependent on the content of Ta substitution, with the maximum values being reached at x = 0.5. We also studied the stability and degradation mechanism of lithium garnets (Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 ) in humid air with relative humidity of above 70%. It is revealed that after exposure in the humid air for 4 weeks, a layer of LiOH∙H 2 O was observed on the grain boundaries, which lowered its ionic conductivity considerably. In comparison, the pellet stored in a desiccator had clear surface with negligible change in the ionic conductivity.
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Haijun Chen,Zhe Chen,Guixia Zhao,Zhibin Zhang,Chao Xu,Yunhai Liu,Jing Chen,Li Zhuang,Tasawar Haya,Xiangke Wang
Ca/Al layered double hydroxide decorated carbon nanotube (Ca/Al-LDH@CNTs) composites were fabricated by co-precipitation method and hydrothermal aged treatment. The prepared Ca/Al-LDH@CNTs was characterized by SEM, TEM, EDS, XRD, FT-IR, UV–vis and XPS techniques, and applied to remove U(VI) from aqueous solutions under various environmental conditions (i.e., pH, ionic strength, temperature and contact time). The results indicated that the adsorption of U(VI) on Ca/Al-LDH@CNTs was four times higher than that of U(VI) on bare CNTs. The kinetic investigations reflected the chemisorption of U(VI) on Ca/Al-LDH@CNTs through oxygen-containing functional groups. The adsorption isotherms demonstrated that the adsorption of U(VI) was well fitted by Langmuir model and the maximum adsorption capacity of U(VI) on Ca/Al-LDH@CNTs was calculated to be 382.9 mg g −1 at 289.15 K. The thermodynamic parameters calculated from temperature-dependent isotherms suggested that U(VI) adsorption on Ca/Al-LDH@CNTs were endothermic and spontaneous process. Furthermore, Ca/Al-LDH@CNTs could remove ∼91% of 241 Am(III) at pH = 8.0, which confirmed Ca/Al-LDH@CNTs as a promising material for multiply low level radionuclides’ pollution remediation.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinchao Li,Ziyuan Zhou,Kuo Zhao,Jiahui Liu,Zhiqi Liu
Due to the development of new energy vehicle industry, global lithium consumption increases rapidly. Extracting lithium from abundant clay-type lithium ore is an effective strategy to secure a cost-effective lithium supply chain. However, lithium extraction from clay-type lithium ore currently faces with the problems of high solid residue yield and low extraction selectivity for lithium. In addition, the compounds of silicon and alumina in ore processing high economic value are usually ignored. Here, we developed a sustainable process for the comprehensive recovery of Li, Si and Al from clay-type lithium ore by combining NaOH-assisted roasting with sulfuric acid leaching. Firstly, the leaching behavior of lithium under different roasting conditions and acid leaching conditions was systematically investigated. Under the optimal acid leaching condition, the lithium leaching rate reached 96.8%, while the solid residue yield was only 8% based on the raw ore. Taking advantage of the gelling property of Si/Al-containing leaching solution, a lithium-containing solid was obtained by drying and roasting of the gel product. The selective extraction of lithium was easily achieved by washing the solid with water, and the high-value utilization of solid residues in the whole process to prepare nanowires mullite, alumina and corundum was realized. The mechanisms of multi-element recovery elucidated that the formation of nepheline phase during NaOH-assisted roasting promotes the efficient leaching of lithium and reduces the solid residue by acid leaching. After roasting of gel product, Si and Al combined to form mullite, while lithium remained in a free state, allowing further selective lithium elution by water and simultaneous recovery of Si and Al. This work provides fresh perspectives on the sustainable and comprehensive utilization of clay-type lithium ore.
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高影响因子
POLYMER
·
2024
·
IF 4.1
Haoyun Deng,Zhixiong Yang,Mengzhen Zhou,Encai Ou,Yanbing Lu,Qiulan Zhou,Kun Liu,Weijian Xu
( Z )-1,3-pentadiene (Zp) exhibits a rigid planar molecular structure and is known for the typical 1,5-sigmatropic hydrogen shift, while it is commonly considered an inert monomer during polymerization. Herein, by utilizing the steric effect of the terminal methyl in Zp, the high trans -1,4-polypentadiene (HTPD) with highly ordered microstructure and well-defined sequence are successfully synthesized using barium dithymol/ tert- butyllithium/ tri -ethylaluminum trimetallic initiators based on anionic polymerization. The significant dependence of polymerization rate and trans -1,4-selectivity on ratio of Ba/Al/Li is demonstrated. The modification in microstructure ( trans -1,4 content ranging from 75 % to 92 %) and stereo-regularity (isotactic triad mm % > 65 %) are confirmed by nuclear magnetic resonance (NMR). Compared with the poly(( Z )-1,3-pentadiene) (PZp) prepared by n -BuLi containing σ -ligand modifiers, the strategy using a large steric initiator to achieve regular insertion of Zp into polymer chains is proved to be effective. Kinetics studies demonstrated that Ba–Al–Li system is characterized by retarded anionic polymerization (RAP), yet it shows a quasi-living process and enabling the preparation of stereometric block polymers such as polyisoprene- b -HTPD (PI- b -HTPD). Thermal performance analysis indicates that the obtained highly ordered polymers show superior thermoplastic properties ( T m = 77.4 °C) with crystallinity as an elastomer. Furthermore, reasonable interpretations for the structure formation, sequence, and rate reduction effected by the Ba/Al/Li trimetallic initiator are proposed.
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危险品化学品经营许可证（带存储）