MICROPOROUS AND MESOPOROUS MATERIALS
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2023
·
IF 5.2
Rui-Li Yu,Qian-Fan Li,Hao-Ran Sun,Zhen-Le Li,Liang-Zhi Xia
In order to efficiently and rapidly capture radioactive iodine that impacts the environment, this study involves impregnating Tetraethylenepentamine (TEPA) into ZSM-5 zeolite with varying Si/Al ratios and evaluating its adsorption performance towards iodine. It is found that the optimal preparation level is 30 %, leading to a significant increase in the saturated adsorption capacity compared to non-impregnated molecular sieves , with a four-fold improvement. The adsorption rate is also enhanced. Various amines are utilized for impregnation, and FT-IR and molecular computation techniques are employed to investigate the adsorption mechanisms between these amines and iodine. The discovery reveals potential interactions between the amine groups and iodine, such as N ⋅ ⋅ ⋅ I halogen bonding and N–H ⋅ ⋅ ⋅ I hydrogen bonding . These findings provide valuable insights for developing iodine adsorbents, offering promising solutions for protecting ecological and living environments.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xuan Zhu,Yan Liu,Menglin Wang,Li Zhang,Qiaoli Li,Entao Zhang,Hongfen Mo,Yuan Gao,Chenyu Xu,Yanwei Zhang
The synergistic coupling of light and heat in solar energy has attracted increasing research attention. In this work, both codoping and coloading were applied to SrTiO 3 -based catalysts to improve their solar photo and thermal conversion, respectively, and maximum productivities of 51.55 and 25.59 mmol·g −1 ·h −1 were achieved for H 2 and O 2 in photothermal synergistic water splitting. The yield of H 2 was nearly double that achieved via pure photocatalysis. In addition to many experiments and characterizations, DFT calculations were also performed to clarify the photothermal synergy. It was found that both the light absorbance and mobility of photoinduced carriers could be promoted by solar thermal effects in the material. Meanwhile, the energy barriers of the key steps were reduced with increasing temperature in the hydrogen production driven by solar photo effects. This work offers new ideas for designing catalysts for solar hydrogen production with photothermal synergistic strategies.
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COMBUSTION AND FLAME
·
2023
·
IF 4.4
Jian Wang,Jie Chen,Yaofeng Mao,Xingquan Zhang,Jun Wang,Fude Nie
Metal fuel with high energy and reactivity is an urgent need for the development of solid propellant, explosive and pyrotechnics. Herein, spherical B/Al/PTFE fuel is designed based on synergistic reaction effect between B/F and Al/F and prepared through the confinement-emulsion-templated method. The combustion reaction performance and pressure output performance of B/Al/PTFE microspheres are much better than their physically mixed counterparts. The synergistic reaction effect between B/F and Al/F on the reaction heat, flame propagation , and pressure output were systematically investigated through adjusting the B/Al mass ratio (30/0∼0/30). The DSC results show that the highest heat of combustion of 4904 J/g can be achieved when the B/Al mass ratio is 21/9. Furthermore, the combustion duration , peak pressure, and pressurization rate are monotonically accelerated from 653 ms, 352.15 kPa, and 305.67 MPa/s to 200 ms, 821.25 kPa, and 1831.18 MPa/s, respectively. This work provides a promising method for the design and preparation of highly composited metal fuel for practical application.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
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IF 9.5
Hailan Wang,Ya Xu,Bozhan Ma,Wenxuan Zou,Jin Zeng,Ruobin Dai,Zhiwei Wang
Environmental and economic concerns necessitate the recycle of end-of-life (EOL) reverse osmosis (RO) membranes. Controlled downcycling of EOL RO membrane to nanofiltration (NF)-like or ultrafiltration (UF)-like membrane through regulating sodium hypochlorite (NaClO) exposure doses has been developed in recent years. However, the impact of foulants on the chlorination-based membrane downcycling is often overlooked. An alkaline-NaClO treatment strategy was employed to downcycle Si-Al complex-fouled EOL RO membrane. Alkaline cleaning not only partially removed Si-Al complex foulants via dissolution, but also converted Al 2 O 3 ·SiO 2 to Al-O-Si amorphous oxides . Subsequent NaClO treatment gradually deconstructed the Si-Al complex fouling layer by dissolving Al contained in Al-O-Si amorphous oxides and degraded the polyamide (PA) layer with extended exposure time, resulting in membrane with loose NF-like characteristic. Moreover, the conversion of Al-contained component with alkaline pre-treatment prevented Al 3+ -catalyzed degradation of PA layer and ensure controlled downcycling. For the downcycling to UF-like membrane, complete removal of PA layer with sufficient chlorine oxidation was essential while alkaline pre-treatment process was optional. Both downcycled loose NF-like and UF-like membranes exhibited satisfactory filtration and antifouling performance. Our study presents an effective and robust protocol for controllable downcycling of EOL RO membrane with alkaline pre-treatment based on their fouling characteristic.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yumeng Zhao,Guoshu Gao,Peng Zhu,Haiou Liu,Yu Guo,Xiongfu Zhang
The preparation of stable metal–organic framework tubular membranes for liquid mixture separation has always been a tough problem. Herein, a flexibly prepared, continuous, and stable Al-based CAU-10 membrane with ceramic tubes as support was developed by a thin γ-Al2O3 layer induction method and employed for the first time in the separation of MeOH/MTBE azeotropic mixtures through pervaporation. The γ-Al2O3 layer introduced on the tube by the dip-coating technique not only facilitated the crystal nucleation and continuous growth of CAU-10 membranes but also reinforced the membrane stability by acting as anchoring sites between the membrane and the substrate. The as-prepared CAU-10 tubular membrane exhibited excellent separation performance for MeOH/MTBE mixtures owing to its suitable pore size and good hydrophilicity. For the separation of 14.3 wt % MeOH/MTBE azeotropic mixtures, the membrane displayed a permeation flux of 1.76 kg/(m2 h) and a high separation factor of 2041 at 50 °C, which is better than most of the membranes reported for the pervaporation separation of MeOH/MTBE mixtures. More excitedly, the CAU-10 tubular membrane continued to be tested for more than 7 days without any obvious change in pervaporation performance, demonstrating its outstanding operational and hydrothermal stability. Accordingly, the CAU-10 tubular membrane would be a promising alternative to separate the MeOH/MTBE azeotropic mixtures due to its easy preparation, high performance, and excellent stability.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 19
·10412
·
IF 5.924
Huiping Chen,Yongpan Shan,Lidong Cao,Pengyue Zhao,Chong Cao,Fengmin Li,Qiliang Huang
Long-term use of a single fungicide increases the resistance risk and causes adverse effects on natural ecosystems. Controlled release formulations of dual fungicides with different modes of action can afford a new dimension for addressing the current issues. Based on adjustable aperture and superhigh surface area, metal–organic frameworks (MOFs) are ideal candidates as pesticide release carriers. This study used Al3+as the metal node and 2-aminoterephthalic acid as the organic chain to prepare aluminum-based metal–organic framework material (NH2-Al-MIL-101) with “cauliflower-like” structure and high surface area of 2359.0 m2/g. Fungicides of azoxystrobin (AZOX) and diniconazole (Dini) were simultaneously encapsulated into NH2-Al-MIL-101 with the loading content of 6.71% and 29.72%, respectively. Dual fungicide delivery system of AZOX@Dini@NH2-Al-MIL-101 demonstrated sustained and pH responsive release profiles. When the maximum cumulative release rate of AZOX and Dini both reached about 90%, the release time was 46 and 136 h, respectively. Furthermore, EC50values as well as the percentage of inhibition revealed that AZOX@Dini@NH2-Al-MIL-101 had enhanced germicidal efficacy against rice sheath blight (Rhizoctonia solani), evidenced by the synergistic ratio of 1.83. The present study demonstrates a potential application prospect in sustainable plant protection through co-delivery fungicides with MOFs as a platform.Keywords:NH2-Al-MIL-101;controlled release;dual encapsulation;synergistic effect;rice sheath blight
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Qiang Zeng,Hui Zhong,Zhiguo He,Liang Hu
Developing materials from natural minerals to efficiently remove arsenite (As(Ⅲ)) from solution is vital important for resources comprehensive utilization and environment protection. In this study, biotite containing minerals was used to prepare a novel composite of amino modified silica supported MnO 2 /Fe–Al hydroxide (SNMFA composite), which was then applied to remove arsenite. Scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results indicated that many amorphous MnO 2 and Fe–Al hydroxide nano sheets were loaded on the surface of layered silica structure. Batch experiments showed that this composite could efficiently remove As(Ⅲ) from aqueous solution, and the maximal removal capacity was identified as 46.11 mg/g. As(Ⅲ) adsorption behaviours of SNMFA composite were confirmed by the pseudo-second-order kinetic model and Langmuir model, indicating that As(Ⅲ) adsorption on its surface was monolayer adsorption. The adsorption process was a pH and temperature dependent process, and increasing pH and temperature have facilitated the removal of As(Ⅲ). Thermodynamic analysis showed that As(Ⅲ) adsorption process was a spontaneous endothermic reaction . The As(Ⅲ) removal was mainly relied on the stable inner-sphere coordination model, and the corresponding mechanisms were involved in chelation, precipitation, oxidation-adsorption and electrostatic interaction.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Hongjie Zhu,Lingxuan Gong,Zhihao Chen,Youyou Hu,Zhengkui Li
The Z-scheme photocatalyst is valuable for use in polluted water purification, and there is a need to develop a cheap and efficient photocatalyst. This study presents a new type of Z-scheme photocatalytic material composed of hematite and P3HT, also, the Al cluster oxides were first used as a charge transfer mediator to construct Z-scheme photocatalysis system. In addition, by analyzing the electron rearrangement phenomenon exhibited by the XPS spectrum and the experimental results of the in-situ illumination XPS, it is found that Al cluster is beneficial to the electron multi-step charge transfer process and Al cluster favors the construction of Z-scheme structure between hematite and P3HT. This Poly-3-hexylthiophene (P3HT)/Al cluster oxide/hematite ternary photocatalyst exhibited an excellent degradation effect on bisphenol A and tetracycline. This study demonstrates the feasibility of using the Al cluster as a charge mediator in the Z-scheme, providing new Z-scheme catalyst construction idea which is beneficial to the popularization and use of Z-scheme system in practical applications, and providing a new material for water pollution purification.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Da-Wei Yang,Ya-Lan Liu,Tai-Qi Yin,Shi-Lin Jiang,Yu-Ke Zhong,Lin Wang,Mei Li,Zhi-Fang Chai,Wei-Qun Shi
To study the application perspectives of binary Ga–Al alloy electrodes in pyroprocessing, the utilization of Ga–Al alloy electrode for the separation of U from Ce was studied in this work. Specifically, the reduction behaviors of U (III) on Ga, Al and Ga–Al alloy electrodes was first explored in LiCl–KCl eutectic at 773 K. The cathode peak potential of U (III) at the Ga–Al alloy electrode was 0.44 V (vs. Li/Li 3 Bi), and less affected by the Ga/Al ratio. Moreover, potentiostatic electrolysis at 0.55 V (vs. Li/Li 3 Bi) was conducted on the Ga–Al alloy electrode for 4 h to separate U from Ce. X-ray diffraction (XRD) analysis indicated the co-existence of Al 3 U and Ga 3 U with an identical crystal structure in the deposits. Scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) illustrated a good diffusion of U metal in Ga–Al alloy electrodes. Inductive coupled plasma optical emission spectrometry (ICP-OES) determinations exhibited an excellent separation performance of the Ga–Al alloy electrode.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2020
·Vol. 27
·期 5
·394-408
·
IF 0
Zhang Luhong,Guo Dandan,Tantai Xiaowei,Jiang Bin,Sun Yongli,Yang Na
In this work, a facile and effective strategy to prepare three-dimensional (3D) hierarchical flower-like Mg–Al layered double hydroxides (3D-LDH) was developed via a one-step double-drop coprecipitation method using γ-Al 2 O 3 particles as a template. The characterization and experimental results showed that the calcined product, 3D-LDO, features a large specific surface area of 204.2 m 2 /g, abundant active sites, and excellent adsorption performance for Congo red (CR), methyl orange (MO), and methyl blue (MB). The maximum adsorption capacities of 3D-LDO for CR, MO, and MB were 1428.6, 476.2, and 1666.7 mg/g, respectively; such performance is superior to that of most reported adsorbents. The adsorption mechanism of organic anionic dyes by 3D-LDO was extensively investigated and attributed to surface adsorption, the memory effect of 3D-LDO, and the unique 3D hierarchical flower-like structure of the adsorbent. Recycling performance tests revealed that 3D-LDO has satisfactory reusability for the three organic anionic dyes.
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Materials
·
2021
·Vol. 14
·期 13
·3561
·
IF 3.623
Lewen Fan,Lizhuang Yang,Dongdong Zhao,Liying Ma,Chunnian He,Fang He,Chunsheng Shi,Junwei Sha,Naiqin Zhao
In this work, few-layered MoS2(FLM) nanosheet-reinforced Al matrix composites are developed through powder metallurgy and hot extrusion. The microstructure, mechanical properties, and strengthening mechanisms have been systematically investigated. It is found that Al12Mo and Al2S3can be formed in-situ during the sintering process, resulting in the improvement of interfacial bonding between FLM and Al matrix. With 1.5 wt.% of FLM addition, an improved tensile strength of 234 MPa with a high elongation of 17% can be obtained. Moreover, the strengthening mechanisms are also demonstrated to be grain refinement, dislocation strengthening, and load transfer, and the calculation indicates that load transfer is the main contribution factor. This work will inspire more new designs of metal matrix composites with balanced strength and ductility.Keywords:aluminum;metal matrix composites (MMCs);MoS2nanosheets;microstructure;mechanical property;strengthening mechanism
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Advanced Energy Materials
·
2021
·Vol. 11
·期 37
·2101962
·
IF 29.368
Zhibo Li,Yiwei Li,Mingjian Zhang,Zu-Wei Yin,Liang Yin,Shenyang Xu,Changjian Zuo,Rui Qi,Haoyu Xue,Jiangtao Hu,Bo Cao,Mihai Chu,Wenguang Zhao,Yang Ren,Lin Xie,Guoxi Ren,Feng Pan
As one of the most promising cathodes for Li-ion batteries, Li-rich layered oxides suffer from low Coulombic efficiency, severe capacity fading, and voltage decay, which are related to the aggregated Li@Mn 6 superstructure units. Herein, a Co-free Li-rich oxide Li[Li 1/4 Mn 1/2 Ni 1/6 Al 1/12 ]O 2 through Al substitution of Co in Li[Li 1/4 Mn 1/2 Ni 1/6 Co 1/12 ]O 2 , is designed. Combining the average structural refinement with the detailed local structural/chemical analysis, it is found that the introduced Al ions occupy the Mn sites in Li@Mn 6 superstructure units, which further induces the partial replacement of the central Li ions in Li@Mn 6 units by Ni 2+ . The modified superstructure units stabilize the anionic framework and suppress structural degradation during long-term cycling. A superior cyclability (a capacity retention of 91.4% after 500 cycles at 1 C) is achieved. This work not only deepens the understanding into the mechanism of Al substitution, but also provides a novel route to design high-performance Li-rich cathodes by modifying the local functional units.
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