DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 32
·12352-12361
·
IF 4.569
Hongqiang Cui,Yongze Cao,Yuhang Zhang,Lei Li,Guojian Li,Sai Xu,Yichao Wang,Jinsu Zhang,Baojiu Chen
A series of Er3+/Yb3+ co-doped Cs3BiSr(P2O7)2 (CBSPO) phosphors with significant thermal enhancement were successfully prepared using the solid-state method and the thermal-enhancing effect was studied in detail. When the temperature increased from 303 to 723 K, the upconversion luminescence (UCL) emission intensities of 2H11/2 → 4I15/2 and 2H11/2 + 4S3/2 → 4I15/2 of Er3+ in CBSPO:0.1Er3+/0.2Yb3+ were enhanced 22.81 and 10.06 times under 980 nm laser excitation, respectively. Meanwhile, the UCL color of the sample obviously changed from orange to green with the increase in temperature. Furthermore, the UCL thermal enhancement mechanism was demonstrated, which originates from phonon-assisted transitions. In addition, the maximum absolute temperature sensitivity for CBSPO:0.1Er3+/0.2Yb3+ was calculated to be 0.01026 K−1 at 563 K via luminescence intensity ratio (LIR) technology. All the results show that the CBSPO:Er3+/Yb3+ phosphors can be used for safety warning and temperature measurement at high temperatures.
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高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2020
·
IF 3.744
Jie Sun,Lujiang Xu,Guo-hua Dong,Sonil Nanda,Hu Li,Zhen Fang,Janusz A. Kozinski,Ajay K. Dalai
Nickel-based catalysts with different supports and cobalt loadings were synthesized for hydrothermal gasification of cellulose at 350 °C. The activity of Ni catalysts was found in the order of Al 2 O 3 > spent bleaching clay ash > SiO 2 with H 2 yield of 80.6%, 69.0% and 57.0%. When 6 wt. % Co was added, 10Ni-6Co/Al 2 O 3 showed the highest H 2 yield of 88.4% i.e., 1.44 times that without Co addition. Catalysts were characterized by NH 3 -TPD, TPR, XRD, BET and XPS, showing that Ni-Co alloy formation promoted H 2 production. Single-factor experiments were conducted to study variables in the presence of 10Ni-6Co/Al 2 O 3 with the selected conditions of 0.5 g biomass and 20 min at 350 °C (achieving 94.9% H 2 yield from cellulose) for gasification of rice straw, peanut shell and cotton straw with the increase in H 2 yield by 51.4, 76.0 and 67.8 times. Ni-Co/Al 2 O 3 catalysts enhanced hydrothermal gasification of actual agricultural residues.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Mingming Zou,Honghong Liu,Lu Feng,Fengqiang Xiong,Tiju Thomas,Minghui Yang
A simple solvothermal approach with post-calcination is used to obtain (Ag, Ag 2 O) co-loaded TiO 2 microspheres with high specific surface area (43.8 m 2 g -1 ) and desirable visible light photocatalytic degradation (64% after 2 h visible light irradiation). Generally, N-doping of TiO 2 via nitridation using NH 3 improves the visible light absorption property of material. However, nitridation of (Ag, Ag 2 O) co-loaded TiO 2 results in a deleterious impact on the photocatalytic performance (around 20% after 2 h visible light irradiation). This is because nitridation of Ag-Ag 2 O-TiO 2 results in (a) reduction of Ag 2 O to Ag and (b) Ag agglomeration and grain growth on TiO 2 particles. These results in fact imply that in as-synthesized (Ag, Ag 2 O) co-loaded TiO 2 systems, local surface plasmonic resonance (associated with of 5–12 nm Ag particles) aids in enhanced broad band visible light absorption; furthermore the heterojunction between TiO 2 and Ag 2 O improves efficiency with which photogenerated carriers become available for photocatalysis . In all cases we show through selective radical quenching experiments that singlet oxygen is the primary reason for the dye degradation observed.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Shujie Guo,Jiao Du,Fangzheng Yan,Zhi Wang,Jixiao Wang
Polyamide (PA) thin-film composite (TFC) nanofiltration (NF) membrane has extremely broad application prospects in separation of monovalent/divalent inorganic salts mixed solution. However, membrane fouling is the main obstacle to the application of PA, TFC and NF membrane. Streptomycin (SM) is a hydrophilic antibiotic containing a large number of hydroxyl and amino groups. In this work, the NF membrane was prepared via interfacial polymerization (IP) between trimesoyl chloride (TMC) in the organic phase and SM/piperazine (PIP) mixture in the aqueous phase. The NF membrane structure and performance were characterized in detail. The results showed that SM successfully participated in the IP. The negative charge and hydrophilicity of membrane surface were improved. The prepared membrane exhibited good anti-adhesion and anti-bacterial performance. Additionally, when the SM concentration was 2%, the prepared membrane exhibited the optimal permselectivity. The water permeance was 89.4 L·m −2 ·h −1 ·MPa −1 . The rejection of NaCl and Na 2 SO 4 were 17.17% and 97.84%, respectively. The NaCl/Na 2 SO 4 separation factor of the SM2-PIP/TMC membrane in 1000 mg·L −1 NaCl and 1000 mg·L −1 Na 2 SO 4 mixed solution was 40, which was 3.3 times that of PIP/TMC membrane. It indicated that SM2-PIP/TMC demonstrated excellent monovalent/divalent salts separation performance. This work provided an easy and effective approach to preparing anti-fouling NF membrane while possessing superior monovalent/divalent salts separation performance.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Nan Gao,Chaohui He,Mingyu Ma,Zhiwei Cai,Yang Zhou,Gang Chang,Xianbao Wang,Yunbin He
For the first time, a simple electrochemical co-deposition was utilized to synthesis the gold and zirconia nanocomposites modified graphene nanosheets on glassy carbon electrode (Au-ZrO 2 -GNs/GCE) for electrocatalytic analysis of methyl parathion (MP). According to Field-Emission Scanning Electron Microscopy (FE-SEM), Transmission Electronic Microscopy (TEM) and X-Ray Diffraction (XRD), the gold nanoparticles were uniformly distributed on the surface of graphene-based nanocomposite. The Au-ZrO 2 -GNs/GCE based sensor exhibited superior capacity for MP detection, ascribed to the strong affinity of zirconia towards the phosphoric group, as well as the high catalytic activity and good conductivity of Au-GNs. The best fabrication and work conditions were then obtained by systematically optimization of the electrodeposition process, pH value and enrichment time. Compared to the gold nanoparticles , zirconia or graphene modified electrodes , Au ZrO 2 -GNs/GCE sensor displayed superior electro-catalytic response toward MP oxidation . The sensor response current of square wave voltammetry was highly linearly correlated with the MP concentrations range of 1–100 ng mL −1 and 100–2400 ng mL −1 with the detection limit of 1 ng mL −1 . The Au-ZrO 2 -GNs/GCE nanocomposite sensor showed excellent accuracy and reproducibility for detection of MP in Chinese cabbage samples, providing a new method for efficient pesticide detection in practical applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Senliang Xi,Xiaojun Wang,Kudzaishe Caren Tome,Tonghuan Zhang,Zongying Han,Meng Gao,Shixue Zhou,Hao Yu
The hydrogen storage performances of MgH 2 improved by the addition of Ni and SAPO-34 were studied in detail. The mixture of MgH 2 with Ni and SAPO-34 was a physical reaction as shown by the X-ray diffraction (XRD) results. The SAPO-34 and Ni were uniformly distributed on the surface of MgH 2 . The thermodynamic and kinetic properties of 90MgH 2 /5Ni/5SAPO-34 were investigated by differential scanning calorimetry (DSC) and pressure-composition-isothermal (PCI) methods. The results showed that the dehydrogenation activation energy of 90MgH 2 /5Ni/5SAPO-34 decreased by 64.3 kJ/mol compared with that of MgH 2 . In addition, the relationship between the value of dehydrogenation heat and hydrogen content was also investigated by in-situ calorimetry. The enthalpy value of each sample in the dehydrogenation processes were calculated by in-situ calorimetry measurement. The dehydrogenation enthalpies of as-milled MgH 2 and 90MgH 2 /5Ni/5SAPO-34 were 63.2 kJ/mol H 2 and 53.6 kJ/mol H 2 , respectively. Thus, the co-doping of Ni and SAPO-34 contributed significantly to decrease the thermodynamic stability and improve the hydrogen sorption kinetic properties of MgH 2 .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 13
·15068-15082
·
IF 3.056
Li Jingqiao,Zhang Wenjing,Qin Yunqi,Li Xiaofei,Wu Shengyu,Chai Juanfen,Du Shanghai
To investigate co-transport behavior of ammonium and colloids in saturated porous media under different hydrochemical conditions, NH 4 + was selected as the target contaminant, and silicon and humic acid (HA) were selected as typical organic and inorganic colloids in groundwater. Column experiments were then conducted to investigate the transport of NH 4 + colloids under various hydrochemical conditions. The results showed that because of the different properties of colloidal silicon and HA after combining with NH 4 + , the co-transport mechanism became significantly different. During transport by the NH 4 + –colloid system, colloidal silicon occupied the adsorption sites on the medium surface to promote the transport of NH 4 + , while humic acid (HA) increased the number of adsorption sites of the medium to hinder the transport of NH 4 + . The co-transport of NH 4 + and colloids is closely related to hydrochemical conditions. In the presence of HA, competitive adsorption and morphological changes of HA caused NH 4 + to be more likely to be transported at a higher ionic strength (IS = 0.05 m, CaCl 2 ) and alkalinity (pH = 9.3). In the presence of colloidal silicon, blocking action caused the facilitated transport to be dependent on higher ionic strength and acidity (pH = 4.5), causing the recovery of NH 4 + to improve by 7.99%, 222.25% (stage 1), and 8.63%, respectively. Moreover, transport increases with the colloidal silicon concentrations of 20 mg/L then declines at 40 mg/L, demonstrating that increased concentrations will lead to blocking and particle aggregation, resulting in delayed release in the leaching stage.
Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhanglin Chen,Wei Cui,Kaiming Zhu,Chunguang Zhang,Chuandong Zuo,Yude Niu,Qi Wang,Xuanyi Yuan,Guanghua Liu
An orange-red emitting Mn 2+ /Si 4+ co-doped AlN phosphor was prepared by an efficient combustion synthesis method. Phase identification and structure characterization were performed using powder X-ray diffraction (XRD) and refined by the Rietveld method. Luminescence and afterglow properties of the AlN-based phosphors such as photoluminescence spectra (PL), CIE values, afterglow decay curves, thermoluminescence glow curves (TL) were systematically studied. Using the Tanabe-Sugano diagram, the Racah parameters B , C , and crystal field splitting parameter Dq of as-prepared phosphor were calculated to be 812 cm −1 , 2168 cm −1 , and 780 cm −1 , respectively. The luminescence intensity and afterglow time were increased, respectively, by about 1.1 and 2.2 times after 3% Si 4+ co-doping. Particular attention was paid to study the mechanism of Si 4+ co-doping on improving luminescence properties using a combination of the above-mentioned method and X-ray photoelectron spectroscope (XPS). Two hypothetical stress cancellation and charge rebalance effects due to Si 4+ co-doping were discussed. Besides, it was found a shallower trap level (0.56 eV, compared to 0.84 eV for those without Si 4+ co-doping) was formed after the co-doping of Si 4+ , which results in enhanced afterglow performance.
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POLYMER BULLETIN
·
2022
·Vol. 80
·期 9
·9709-9726
·
IF 2.843
Wang Guoqiang,Zhang Li,Wang Jianyu,Hao Xingyu,Dong Yakun,Sun Rubo
Polylactic acid (PLA) is a kind of bio-based and biodegradable polyester and has shown promise in a variety of fields, but its wider application is limited due to its brittle property. Therefore, in order to improve the ductility of PLA, we synthesized bio-based and biodegradable poly(butylene adipate-copolybutylene furandicarboxylate) (PBAF70) and blended with PLA. The blend's structure, mechanical properties, thermal properties, crystallization properties, and rheological properties were characterized. The results reveal that when the amount of PBAF70 varies from 0 to 30 wt%, the elongation at break increases from 5.7 to 222%, indicating that PBAF70 enhanced the ductility of PLA. At the same time, XRD results showed that stretching-induced crystallization occurred in PBAF70 during the stretching process. The strongly electronegative oxygen atoms in the furan ring may increase the interaction and the compatibility between PBAF70 and PLA. Therefore, the glass transition temperature of PBAF70 is not obvious in the DSC curves of the blends, and the rheological results show that the complex viscosity of the blends is greater than that of PLA. Due to the addition of PBAF70, PLA can only crystallize at a higher temperature, and the addition of PBAF70 hinders the cold crystallization of PLA. It can be seen from SEM that the cross section of the blend is rough, while the PLA is smooth. When the amount of PBAF70 was the same as that of PBAT, the elongation at break of PLA/PBAF70 was better than PLA/PBAT.
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高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-13
·
IF 12.121
Zhao Fulai,Feng Yiyu,Wang Yu,Zhang Xin,Liang Xuejing,Li Zhen,Zhang Fei,Wang Tuo,Gong Jinlong,Feng Wei
The discovery of graphene and graphene-like two-dimensional materials has brought fresh vitality to the field of photocatalysis. Bandgap engineering has always been an effective way to make semiconductors more suitable for specific applications such as photocatalysis and optoelectronics. Achieving control over the bandgap helps to improve the light absorption capacity of the semiconductor materials, thereby improving the photocatalytic performance. This work reports two-dimensional −H/−OH terminal-substituted siligenes (gersiloxenes) with tunable bandgap. All gersiloxenes are direct-gap semiconductors and have wide range of light absorption and suitable band positions for light driven water reduction into H 2 , and CO 2 reduction to CO under mild conditions. The gersiloxene with the best performance can provide a maximum CO production of 6.91 mmol g −1 h −1 , and a high apparent quantum efficiency (AQE) of 5.95% at 420 nm. This work may open up new insights into the discovery, research and application of new two-dimensional materials in photocatalysis.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Mengwei Han,Yuzhu Qian,Xinni Li,Nailiang Wang,Ting Song,Li Liu,Xianyou Wang,Xiongwei Wu,Man-Kay Law,Bei Long
Developing insertion-type anode is key to advancing “rocking chair” zinc-ion batteries, though there are few reported insertion-type anodes. Herein, the Bi 2 O 2 CO 3 is a high-potential anode, with a special layered structure. A one-step hydrothermal method was used to prepare Ni-doped Bi 2 O 2 CO 3 nanosheet , and also a free-standing electrode consisting of Ni-Bi 2 O 2 CO 3 and CNTs was designed. Both cross-linked CNTs conductive networks and Ni doping improve charge transfer. Ex situ tests (XRD, XPS, TEM, etc.) reveal the H + /Zn 2+ co-insertion mechanism of Bi 2 O 2 CO 3 and that Ni doping improves its electrochemical reversibility and structural stability. Therefore, this optimized electrode offers a high specific capacity of 159 mAh g −1 at 100 mA g −1 , a suitable average discharge voltage of ≈0.400 V, and a long-term cycling stability of 2200 cycles at 700 mA g −1 . Besides, the Ni-Bi 2 O 2 CO 3 //MnO 2 “rocking chair” zinc-ion battery (based on the total mass of cathode and anode) delivers a high capacity of ≈100 mAh g −1 at 50.0 mA g −1 . This work provides a reference for designing high-performance anode in zinc-ion batteries.
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高影响因子
Small
·
2023
·Vol. 19
·期 23
·2300106
·
IF 13.3
Ziqin Liu,Xin Dong,Jing Wen,Pu Hu,Chaoqun Shang
The high reactivity of Li metal and the inhomogeneous Li deposition leads to the formation of Li dendrites and “dead” Li, which impedes the performance of Li metal batteries (LMBs) with high energy density. The regulating and guiding the Li dendrite nucleation is a desirable tactic to realize concentrated distribution of Li dendrites instead of completely inhibiting dendrite formation. Here, a Fe-Co-based Prussian blue analog with hollow and open framework (H-PBA) is employed to modify the commercial polypropylene separator (PP@H-PBA). This functional PP@H-PBA can guide the lithium dendrite growth to form uniform lithium deposition and activate the inactive Li. In details, the H-PBA with macroporous structure and open framework can induce the growth of lithium dendrites via space confinement, while the positive Fe/Co-sites lowered by polar cyanide (−CN) of PBA can reactivate the inactive Li. Thus, the Li|PP@H-PBA|Li symmetric cells exhibit long-term stability at 1 mA cm −2 for 1 mAh cm −2 over 500 h. And the Li-S batteries with PP@H-PBA deliver favorable cycling performance at 500 mA g −1 for 200 cycles.
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高影响因子
危险品化学品经营许可证（带存储）