SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qi Chai,Bo Yang,XiuMin Li,Fengfeng Gao,Xiaogang Hao
A nickel hydroxide/carbon black/polyvinylidene fluoride (Ni(OH) 2 /CB/PVDF) film was coated on a graphite plate substrate and used for the selective and efficient extraction of W(VI) using self-driven film adsorption. The excellent self-driven adsorption performance of Ni(OH) 2 /CB/PVDF film for W(VI) was demonstrated by the comparison of the experimental performance of film adsorption and electrochemically switched ion exchange (ESIX) process. In the Ni(OH) 2 /CB/PVDF film, the adsorption of W(VI) by Ni(OH) 2 was achieved through the ligand exchange reaction with W(VI) and abundant hydroxyl groups, which ensured the self-driven performance. The adsorption capacity of the self-driven Ni(OH) 2 /CB/PVDF film for W(VI) under neutral conditions could reach up to 37.53 mg·g −1 after 12 h. Moreover, the adsorption kinetics and adsorption thermodynamics showed that the adsorption of W(VI) on Ni(OH) 2 /CB/PVDF films was more in line with the pseudo-second-order kinetic model, and the adsorption was heat-absorbing and spontaneous. After seven cycles of adsorption/desorption, the adsorption capacity of W(VI) by Ni(OH) 2 /CB/PVDF film could reach 79.37 % of its initial value, which showed good adsorption/desorption cycle performance. Moreover, Ni(OH) 2 /CB/PVDF films showed high selectivity for W(VI) when WO 4 2− coexisted with Cl − , NO 3 – , and SO 4 2− , respectively. This study confirmed that the self-driven Ni(OH) 2 /CB/PVDF film had efficient and stable adsorption performance for W(VI), which can be regarded as a promising method for the selective adsorption of W(VI) from aqueous solution.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Small
·
2021
·Vol. 17
·期 38
·2102066
·
IF 13.281
Qian Chang,Fan Wang,Zicheng Zuo,Feng He,Yao Zhao,Fuyi Wang,Yuliang Li
Suppressing the irreversible interfacial reactions is an important scientific bottleneck in the development of stable high-energy-density lithium-ion battery. The interfacial chemistry of graphdiyne (GDY) on the high-voltage cathode of LiNi 0.5 Mn 1.5 O 4 (LNMO) shows a very interesting process, in which the sp-hybridization carbon atoms chemically scavenge the hydrofluoric acid (HF) and in situ form the fluorinated GDY interface. It first turns the harmful HF into profit, and greatly enhances the interfacial stability and restrains the side reaction on the cathode under high working voltage. The GDY-coated LNMO cathode obviously alleviates the electrolyte degradation, achieves high Coulombic efficiency and reliability. Due to atomic-level selectivity and chemical trapping of HF by GDY, it effectively suppresses the dissolution of Mn, Ni elements. These results highlight the unparalleled advantages of GDY in the formation of high stable interfaces and protection of high-energy-density electrodes.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Jingkun Chen,Xue Yang,Yucheng Li,Minghui Xu,Xuechun Yang,Jian Tang,Pu Zheng,Jie Yan,Jingtai Zhao,Qianli Li
The development of high-speed imaging technology requires ultrafast scintillators. ZnO is an excellent scintillator whose near-band-edge (NBE) radiation attenuation can reach subnanosecond levels. Homogeneous and unique double-layered ZnO:Sc microcrystals (1% doping) were prepared by adding polyvinylpyrrolidone during a hydrothermal reaction. The growth process of double-layer ZnO:Sc microcrystals and the effects of Sc doping concentration on the morphology of ZnO:Sc microcrystals were studied. ZnO:Sc tended to nucleate into twins in weakly basic hexamethylenetetramine. The c-axis growth of ZnO was inhibited by Sc doping, and the growth pyramid of ZnO:Sc was in accordance with the Burton–Cabrera–Frank growth model in the (002) plane, according to the spiral dislocation. Sheet ZnO:Sc microcrystals were obtained under high-concentration Sc doping. After hydrogen annealing, the NBE intensity of 0.5%-doped ZnO:Sc microcrystals was higher than that of ZnO, mainly owing to inhibition of defect luminescence and sheet morphology, which reduced the self-absorption of ZnO:Sc. The decay time of the ZnO:Sc microcrystals after hydrogen annealing under ultraviolet excitation was less than 1 ns. Combining the annealed microcrystals with polydimethylsiloxane to form a flexible composite film enables the scintillation screen to be used for ultrafast X-ray detection with a spatial resolution of up to 16 lp/mm.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Penghua Qin,Zhen Wu,Pengyu Li,Dian Niu,Minghua Liu,Meizhen Yin
The construction of chiroptical materials with controllable chirality is of special importance in biology and chemistry. Although tunable chirality can be realized in various systems, it remains a fundamental challenge to realize multimodulated chiral inversion. Herein, we report that chiral alanine derivative and fluorescent cyanostilbene derivative co-assemble to prepare supramolecular chiral systems, where twist nanofibers with totally inverted supramolecular chirality and circularly polarized luminescence are obtained through stoichiometric modulation. The supramolecular handedness can be inverted by means of altering the cooling rate and incorporating metal ions. The mechanism study reveals that the synergistic effect among hydrogen bonds, coordination interactions, and π–π stacking interactions contributes to the chirality inversion. This work establishes an effective strategy to precisely modulate supramolecular chirality in multiple ways, which shows great potential in developing smart chiroptical materials capable of achieving complex functionalities.
研究领域:
化学
·
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Yao Tian,Chunmei Zeng,Shiyu Yang,Yang Luo,Lunhong Ai,Jing Jiang
Development of efficient and economical non-precious metal catalysts for dehydrogenation of ammonia borane is an important way to store and release hydrogen. Vacancy-engineered defective catalysts with modulated electronic structure allow ideal adsorption and dissociation of reactant molecules for the optimized catalytic activity. In this study, we report a facile synthesis of cobalt-defective Co 3 O 4 (V Co -Co 3 O 4 ) nanocatalyst by the calcination of layered cobalt glycerate as a key precursor. The stacked cobalt-oxygen sheets and interlayer bound glycerate anions in a layered structure are favorable for introducing cation vacancy during calcination process. The obtained V co -Co 3 O 4 exhibits outstanding catalytic activity for the hydrolysis of ammonia borane, along with a high hydrogen production rate of 934 mL min −1 g Cat -1 and a low activation energy of 32.65 kJ mol −1 . The catalytic performance of the V Co -Co 3 O 4 catalyst can be well maintained for consecutive five cycles. The current study establishes a new example of cation vacancy strategy to facilitate the hydrolysis of ammonia borane for hydrogen generation.
研究领域:
材料科学
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催化化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
A dye-sensitive photocatalytic H 2 evolution reaction (HER) system with photogenerated carrier directed conduction was constructed. The protonated g-C 3 N 4 combines with the sheet-like Co MOF to form a 2D/2D heterojunction via electrostatic self-assembly. The protonated g-C 3 N 4 and 2D Co-MOF directionally adsorb Eosin Y (EY) and triethanolamine (TEOA) molecules through hydrogen bond and complexation to achieve a whole photocatalytic system. The integral structure effectively facilitates the utilization of dye sensitizer and hole sacrificial agent to achieve the effective and stable photocatalytic H 2 evolution capacity. The photocatalytic hydrogen evolution rate of g-C 3 N 4 after protonation is 1.88 times as high as that of the original g-C 3 N 4 . On the basis of 2D/2D heterojunction, Co MOF is doped with rare earth element Sm. The 4f electrons and the difference valences (Sm 3+ and Co 2+ ) further suppress the reorganization of photogenerated excitons to achieve highly efficient photocatalytic HER. The directional coupling of sensitizer and electron sacrificial agent combined with rare earth element doping makes the photocatalytic HER rate of the composite material reached 73.42 μmol . h −1 within 5 h under simulated sunlight.
研究领域:
材料科学
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光化学
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能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Qilong Zhou,Lisong Dong,Jian Wu,Yijun Shi,Xin Feng,Xiaohua Lu,Jiahua Zhu,Liwen Mu
From one to more, the same raw materials giving rise to multifarious products is one of the goals of researchers to pursue industrial efficiency. Herein, we designed a formula (controlling the content of the matrix) to prepare two functional ionic gels, integrating the excellent lubrication, thermal conductivity, and self-healing ability to meet different industrial demands of the lubrication and biomedical fields. Deep eutectic solvents (DESs) of urea/choline chloride (UCC) and glycerol/choline chloride (GCC) were locked in polyacrylamide (PAM) ionic gel formed by acrylamide (AM) and a photoinitiator by free-radical polymerization. The unique dual hydrogen bond network in the ionic gel causes the material to exhibit a low wear rate, which can effectively reduce the wear of metal contact. With the addition of PAM, the ionic gel has excellent mechanical strength and good recovery performance. Unexpectedly, this dense hydrogen bond network enhances thermal conductivity by optimizing phonon and electron transfer. The versatile ionic gel has a good application prospect as a substitute for industrial lubricants and medical device materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Lihua Qian,Guojun Lan,Xiaoyan Liu,Zhenqing Li,Ying Li
The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) by using water as solvent is a crucial process in the production of fine chemicals from biomass. An ultrathin carbon layer coating CoRu bimetallic catalyst supported on silica (CoRu@C/SiO 2 ) is prepared by using tannis-ligated cobalt-ruthenium complex on silica as precursors, and applied for catalyzed synthesis of GVL from LA. Because of the synergistic effect between cobalt and ruthenium, the addition of small amounts of Ru to Co catalysts can increase the catalytic activity in the aqueous hydrogenation of LA. The ultrathin carbon layer covered on the CoRu bimetallic catalyst can greatly reduce the leaching of active metals. The CoRu@C/SiO 2 catalyst achieves high stability and is reused up to 5 runs without significant loss of performance in aqueous hydrogenation of levulinic acid.
研究领域:
催化化学
·
生物质能
·
材料科学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 9
·期 2
·e202101580
·
IF 4.59
Yong Jiang,Youcheng Qin,Wei Luo,Hao Liu,Wei Shen,Yimin Jiang,Ming Li,Rongxing He
Graphical Boosting HER stability : The Ru-MC prepared by a special synthesis method can greatly improve the utilization of Ru; the strong interaction between Ru and O modulates the electronic structure of Ru nanoparticles (NP) and prevents Ru NPs from aggregation to boost HER stability. The Ru(3 mL)-MC exhibits high HER performance with overpotential of 27 and 40 mV at benchmark of 10 mA cm −2 both in alkaline and acidic solutions. Crystallized Ruthenium (Ru) metal with high hydrogen production activity is extremely unstable. Herein, we report an efficient and durable hydrogen evolution reaction (HER) electrocatalyst Ru-MC (mesoporous carbon) synthesized by a special method, in which Ru 3+ is added after the formation of spherical MC, leading to only a small amount of Ru being embedded and the vast majority being evenly distributed on the MC surface. The dispersed Ru nanoparticles not only prevent them from aggregation to greatly improve their stability (both over 160 hours in acidic and alkaline solutions), but also provide outstanding intrinsic catalytic activity because oxygen regulates the electronic structure of Ru nanoparticles. The as-synthesized catalyst only needs an overpotential of 27 and 40 mV to deliver 10 mA cm −2 in 1.0 M KOH and 0.5 M H 2 SO 4 . The present work provides guidance for the design of efficient and stable Ru-based HER electrocatalysts used in a wide pH range.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 7
·5961-5970
·
IF 3.442
Luo Shuai,Qiao Xuan,Wang Qiu-Yu,Zhang Yun-Fei,Fu Ping,Lin Zhi-Dong,Du Fei-Peng,Cheng Chun
To develop low-cost and high-performance self-healing antifogging coatings, polyvinyl alcohol/hydrolyzed poly(styrene-co-maleic anhydride) (PVA/H-PSMA) coatings were prepared from a mixed solution of polyvinyl alcohol (PVA) and hydrolyzed poly(styrene-co-maleic anhydride) (H-PSMA) via spin coating and annealing. The microstructure, antifogging behavior, and self-healing ability were investigated. High transparency and low surface roughness were observed when the PVA/H-PSMA film was coated on glass slides. The PVA/H-PSMA coatings showed excellent antifogging performance in a warm, humid environment. The coatings also performed well when transferred from a refrigerator to room temperature. The antifogging coatings showed desirable water resistance due to strong chemical bonding between PVA and H-PSMA, as well as excellent self-healing ability due to hydrogen bonding self-assembly in the PVA/H-PSMA structure. The coatings still exhibited excellent antifogging effects after 20 scratching-repairing cycles, illustrating their potential use in practical applications.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-11
·
IF 5.578
Yao Qilu,Lu Zhang-Hui,Yang Kangkang,Chen Xiangshu,Zhu Meihua
Ultrafine ruthenium nanoparticles (NPs) within the mesopores of the SBA-15 have been successfully prepared by using a “double solvents” method, in which n -hexane is used as a hydrophobic solvent and RuCl 3 aqueous solution is used as a hydrophilic solvent. After the impregnation and reduction processes, the samples were characterized by XRD, TEM, EDX, XPS, N 2 adsorption-desorption and ICP techniques. The TEM images show that small sized Ru NPs with an average size of 3.0 ± 0.8 nm are uniformly dispersed in the mesopores of SBA-15. The as-synthesized Ru@SBA-15 nanocomposites (NCs) display exceptional catalytic activity for hydrogen generation by the hydrolysis of ammonia borane (NH 3 BH 3 , AB) and hydrazine borane (N 2 H 4 BH 3 , HB) at room temperature with the turnover frequency (TOF) value of 316 and 706 mol H 2 (mol Ru min) −1 , respectively, relatively high values reported so far for the same reaction. The activation energies ( E a ) for the hydrolysis of AB and HB catalyzed by Ru@SBA-15 NCs are measured to be 34.8 ± 2 and 41.3 ± 2 kJ mol −1 , respectively. Moreover, Ru@SBA-15 NCs also show satisfied durable stability for the hydrolytic dehydrogenation of AB and HB, respectively.
研究领域:
纳米催化
·
能源材料
·
无机化学
·
氢气储存与释放
·
多相催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dewang Zeng,Fengwen Kang,Yu Qiu,Dongxu Cui,Min Li,Li Ma,Shuai Zhang,Rui Xiao
Supporting materials are often employed to enhance the stability of iron oxides oxygen carriers, but the reactivity is compromised for the dilution of the active phase. Here, we report several iron oxides supported by ionic conducting gadolinium-doped cerium oxides (GDC) for efficient chemical looping hydrogen production. The results show that GDC support can simultaneously improve redox stability and activity. Specifically, the produced Fe 2 O 3 /Gd 0.3 Ce 0.7 O 3−δ exhibits a high hydrogen production rate of ~0.71 mmol·g −1 ·min −1 and hydrogen yield of ~10 mmol·g −1 with negligible decay through 20 redox cycle. When using methane as the reducing agent, Fe 2 O 3 /Gd 0.3 Ce 0.7 O 3−δ shows high methane conversion of 75.67% and much lower carbon deposition than Fe 2 O 3 . The high performance is attributed to the improved oxide ion-conductivity through the oxygen carrier, which is further verified as the ability of the GDC support to accelerate the oxygen diffusion in the bulk. The explored support effects in this work can be extended to design oxygen carrier materials with both high activity and stability.
研究领域:
材料科学
·
能源化学
·
催化化学
·
无机化学
·
清洁能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）