JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Qingling Zeng,Wenxiang He,Ning Zhang,Dongcai Guo
Sr 2 SnO 4 :Eu 3+ phosphors were prepared by a co-precipitation combined with hydrothermal method for the first time, and Li + was introduced to improve its luminescence performance. X-ray diffraction analysis determined that Sr 2 SnO 4 :Eu 3+ , Li + phosphors were successfully synthesized. The effects and mechanisms of Li + doping on the luminescence properties of Sr 2 SnO 4 :Eu 3+ were specifically discussed. At 260 nm excitation, the fluorescence spectra of the products were dominated by the 5 D 0 - 7 F 1 characteristic emission peak of Eu 3+ at 598 nm, with the electric dipole transition 5 D 0 - 7 F 2 being distinctly lower than the magnetic dipole transition 5 D 0 - 7 F 1 , indicating that Eu 3+ selectively replaced the highly symmetrical defective sites of Sn 4+ . The luminous intensity and decay lifetime were significantly enhanced through co-doping Li + , which played an essential role as a charge compensator. The optimum doping concentration of Li + was 7%. Finally, the color purity of Sr 2 SnO 4 :Eu 3+ , Li + reached 99.9%, suggesting that it could be developed as a potential orange-emitting material for solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 4
·850
·
IF 5
Linlin Liu,Yue Zhang,Youliang Cheng,Jing Chen,Fengjuan Li
The photocatalytic degradation of organic dyes in waste water using carbon quantum dots (CQDs) remains a hot topic due to the importance of environmental protection. However, identifying suitable carbon resources and successful surface modification are still challenging. Herein, the hydrothermal method and surface modification of ammonia and thionyl chloride were applied to synthesize CQDs with different surface groups using PEO106PPO70PEO106(Pluronic F127) as a carbon source. The average particle size of the as-prepared CQDs was in the range of 2.3–3.5 nm. The unmodified CQDs had the highest relative photoluminescence intensity, while all as-prepared CQDs exhibited abnormal photoluminescence located outside the scope of the visible spectrum. Interestingly, CQDs modified with ammonia achieved a degradation rate of 99.13% (15 d) for 50 mg/L indigo carmine solution, while CQDs modified with thionyl chloride reached a degradation rate of 97.59% (15 d) for light green SF yellowish solution. Therefore, in this work, two typical organic dyes can be effectively photocatalytically degraded by as-prepared CQDs, with suitable surface modification.Keywords:carbon quantum dots;hydrothermal method;photocatalytic activity
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2024
·
IF 8.3
Mingzhi Lv,Yaoxing Liu,Jie Jiang,Rui Lian,Hun Xue,Riyao Chen,Rui Ding,Jianxi Liu
With the development of industrial civilization, large amounts of wastewater containing boron and zinc are being produced. Such wastewater poses a great threat to human health if discharged without treatment. In this study, an integrated technology of electrodialytic metathesis (EDM) and a hydrothermal process was utilized to recover boron and zinc from wastewater in the form of zinc borate (Zn 2 B 6 O 11 ·3H 2 O). Experimental results showed that electrolyte concentration , current density , and initial boron and zinc concentration clearly affected the recovery ratios for B 4 O 7 2− and Zn 2+ and their corresponding specific energy consumption and current efficiencies . Under the optimal experimental conditions (an electrolyte concentration of 1.0 mol/L in the recycling compartment in the experimental setup, a current density of 15 mA/cm 2 , initial ZnSO 4 and Na 2 B 4 O 7 concentrations of 0.1 mol/L, and a flow rate of 20 mL/min), the recovery ratio, specific energy consumption, and current efficiency were 85.6 %, 6.5 kW·h/mol, and 12.3 %, respectively, for recovering B 4 O 7 2− and 80.6 %, 1.7 kW·h/mol, and 45.7 %, respectively, for recovering Zn 2+ . When one recovery compartment was employed, the current efficiencies for recovering B 4 O 7 2− and Zn 2+ were 12.3 % and 45.7 %, respectively, and these values were 11.4 % and 43.8 %, respectively, when two recovery compartment were used. After B 4 O 7 2− and Zn 2+ concentrated by EDM were treated via a hydrothermal process, a white precipitate was produced. The results of X-ray diffraction, Fourier transform infrared spectroscopy , and thermogravimetric analyses showed that this precipitate exhibited physicochemical properties similar to those of commercial Zn 2 B 6 O 11 ·3H 2 O. Thus, the integrated technology can be regarded as an effective method for recovering boron and zinc from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Gao Kai,Shi Yunfeng,An Kexin,Tan Jun,Zhang Yanna,Dong Jiajie,Yu Weiyue,Lin Haipeng
A hydrothermal method which can convert free cesium ions into stable pollucite at low temperatures was established in this work, avoiding any evaporation pollution during the disposal of cesium containing waste. Meanwhile, rapid synthesis under hydrothermal conditions was achieved using seed guidance, which shorten the growth time of pollucite crystals to 8 h, and making the treatment and disposal of cesium containing wastewater faster. Standard leaching test results show that the leaching rate of Cs was very low (< 3.5 × 10 −7 g·m 2 ·d), it still has good thermal stability at a temperature of 1300 °C, when the cesium content in pollucite reaches 20%.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 1
·65
·
IF 4.034
Jiquan Li,Youyan Wang,Huan Ling,Ye Qiu,Jia Lou,Xu Hou,Sankar Parsad Bag,Jie Wang,Huaping Wu,Guozhong Chai
Bismuth ferrite (BiFeO3, BFO) submicron cubes and 3D BFO/graphene composite materials were synthesized by a simple hydrothermal process. The crystallization processes of the 3D BFO/graphene composites with different graphene oxide (GO) concentrations were studied for their visible light photocatalytic properties. Compared to the single BFO submicron cubes, 3D BFO/graphene composites have greatly improved photocatalytic activity. A high photocatalytic performance is obtained at a GO concentration of 3 mg/mL, with the degradation rate of methylene blue (MB) dye reaching up to 92% in 140 min. The enhancement of photocatalytic activity can be attributed to the large specific surface area and 3D architecture of 3D composites, which provide more transport paths to effectively improve the separation rate of photo-generated electrons and holes. Therefore, 3D BFO/graphene composites have a broad prospect of application in the field of photocatalysis.Keywords:BiFeO3;hydrothermal;photocatalysis;methylene blue
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Jia Luo,Yuqing Luo,Jun Tan,Hongsheng Che,Ting He,Jiugang Hu
The large-scale and controllable production of boehmite has attached much attention due to its extensive application in advanced energy and electronics industries. In this study, a facile vaporthermal (VPH) method was developed for the rapid fabrication of rhombic boehmite microflakes using low-cost commercial gibbsite particles. The evolution behaviors of gibbsite to boehmite under VPH and conventional hydrothermal (LPH) conditions were ex-situ monitored by XRD , Raman, and FT-IR techniques. The boehmite powders from VPH (V-boehmite) and LPH (L-boehmite) have similar crystal structure and bonding vibration information, whereas V-boehmite exhibits rhombic morphology and L-boehmite presents cubic morphology. Moreover, the formation time of boehmite can be shortened from 16 h of LPH to 6 h of VPH at 180 °C, which significantly contributes to its scalable production. These differences of V-boehmite are attributed to the direct contact between high-temperature saturated water steam and gibbsite, which can induce the rapid formation of rhombic boehmite microflakes through dissolution-recrystallization mechanism. Therefore, the vaporthermal technology has great potential for efficient, sustainable, and large-scale production of boehmite powders.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Binxia Yuan,Xiaobo Liu,Xiaodong Cai,Xinyi Fang,Jianfeng Liu,Maoliang Wu,Qunzhi Zhu
In the paper, the zinc and cerium or both doped cuprous oxide (Cu 2 O) crystals were successfully synthesized under low temperature by a simple hydrothermal process. The surface morphologies, structure properties, and optical properties of Cu 2 O crystals were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-visible absorption spectroscopy. The morphology of pure Cu 2 O crystals, Zn:Cu 2 O crystals, Ce:Cu 2 O crystals and Zn/Ce:Cu 2 O crystals evolved to irregularly cubic structure, exfoliated octahedron, were regular octahedron, and like-spherical aggregate, respectively. The doping of Cu 2 O crystals not only affected the surface morphologies but also significantly influenced the optoelectronic properties. Compared with undoped cuprous oxide, the doped samples had larger optical band gaps. Finally, the aggregation and diffusion were the most important factors for the morphology evolution of Cu 2 O crystal.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Majid Ali Mangi,Benwang Li,Peigao Duan,Changqing Cao
In this study, a green and effective method for the production of acetic acid from crop residues via a two-step process (hydrolysis followed by oxidation) in subcritical water was proposed. For the first step, CO 2 is used to catalyze the hydrolysis of crop residues to obtain intermediates. Next, the intermediates were oxidized in the presence of O 2 to obtain acetic acid. The effects of crop residue type on the yield of acetic acid were first studied. Among all the crop residues selected, the corn cobs provided the highest acetic acid yield, which reached 16.70 wt% at 270 °C for 20 min; 0.11 mol CO 2 /corn cob (g) was added for the first step, and 250 °C was added for 50 min, with 0.15 mol O 2 /corn cob (g) added for the second step. By employing corn cobs as feedstock, the effects of the corn cob/water mass ratio, temperature, time, and CO 2 loading in the first step and the effects of temperature, time, and O 2 loading in the second step on the yield of acetic acid were examined. Among all the parameters examined, the corn cob/water mass ratio had the greatest influence on the acetic acid yield. The highest acetic acid yield of 25.80 wt% was obtained at a corn cob/water mass ratio of 0.0016:1. Under fixed reaction conditions, recycling the product mixture can increase the concentration of acetic acid in the final product and reduce the cost of subsequent separation and purification.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2019
·
IF 1.874
Qi-Fang Ren,Bo Zhang,Shao-Hua Chen,Su-Lei Wang,Qian Zheng,Yi Ding,Hai-Sheng Qian,Zhen Jin
The Eu 3+ doped YVO 4 nanocrystallines with various morphologies were successfully synthesized by an amines (TETA, ETA and EDA) assisted hydrothermal process. By rationally adjusting the adding amount of TETA, ETA and EDA, the trepang-like, globular-like and pineapple-like Eu 3+ doped YVO 4 nanostructures can be conventionally obtained. The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD patterns indicate that these samples are all of the tetragonal structure. The SEM and TEM results show that the amines additives play an important role in morphology formation. Furthermore, the fluorescence properties of those samples are also systematically studied. Under the excitation of 280 nm, Eu 3+ doped YVO 4 : nanostructures emit strong red fluorescence due to the transitions of 5 D 1 - 7 F 1 and 5 D 0 - 7 F J (J = 1, 2, 3 and 4) of Eu 3+ ions. The intensity of red fluorescence is related to not only the concentrations of Eu 3+ , but also the types of adding amines. The effective luminescence lifetimes of the trepang-like Y 0.9 Eu 0.1 VO 4 nanocrystallines, the globular-lik and pineapple-like Y 0.95 Eu 0.05 VO 4 nanocrystallines are 0.91 ms, 1.02 ms and 1.14 ms, respectively. It is believed that this study is beneficial to promote the development of color display industry.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Li Lv,Junzhong Wang,Wei Wang,Limin Han
In this paper, Y 3+ ions doped CaMoO 4 :Eu 3+ with controlled microstructures were prepared via a hydrothermal method . All samples were fully characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV–vis diffuse reflectance spectroscopy, and photoluminescence measurement. The luminescent performance improvement aroused by doping was systematically investigated after inducing Y 3+ as co-doping ions in CaMoO 4 :Eu 3+ lattice. It is found that the lattice of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals contracted with increasing the Y 3+ concentration, resulting in a red shift of 1 A 1 → 1 T 1 transition from the valence band to the conduction band. Meanwhile, excitation band at 300 nm corresponding to the typical 1 A 1 → 1 T 1 transition also shifted to lower energy, originating from the charge-transfer between MoO 4 2− group and Eu 3+ ions. When the Y 3+ doping concentration was less than 0.05, the quantum efficiency of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals was all superior to pure CaMoO 4 :Eu 3+ nanocrystals, which can be assigned to the lattice structure contraction, co-doping effect, doping concentration variation. However, as the content of Y 3+ ions further increasing, Y 3+ ion should act as a luminescence killer, and therefore resulting in a nonradiative de-excitation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xing Yang,Jun Guo,Zi-Yuan Wang,Wen-Hao Gu,Quan Shan,Jing Feng,Zhen-Hua Ge
Bi 2 S 3 -based materials with low thermal conductivity and high Seebeck coefficient has been regarded as promising thermoelectric materials for years. To optimize the thermoelectric properties of Bi 2 S 3 materials, (Se, Cl)-co-doped nanostructured Bi 2 S 3 bulks were prepared by hydrothermal method combined with spark plasma sintering . The doping contents of Se and Cl in Bi 2 S 3 depend on the reaction time of the hydrothermal process. A high power factor of 450 μWm −1 K −2 was achieved for Bi 2 S 3 sample with the reaction time of 24 h owing to the substitution of S by Se and Cl. Meanwhile, a low thermal conductivity of 0.35 Wm −1 K −1 is obtained for the Bi 2 S 3 sample with the reaction time of 18 h, owing to the strong phonon scattering caused by the high density of grain boundaries, pores and point defect . Therefore, benefiting from the improved electrical transport properties and reduced thermal conductivity, a peak ZT value of ~ 0.57 was obtained at 673 K for the Bi 2 S 3 sample with the reaction time of 24 h.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1429
·
IF 4.501
Yali Song,Huan Zhang,Ziyan Li,Long Huang,Junhao Xie,Long Han,Ruoying Zheng,Yuqing Zhang,Hongzhong Zhang
Previous studies have displayed various conclusions about the effect of preparation factors on the photoreduction property of ZnIn2S4. Therefore, it is not easy to figure out the optimal preparation conditions of ZnIn2S4for Cr(VI) photoreduction. To ensure Cr(VI) reduction efficiency, various ZnIn2S4photocatalysts were prepared in different solvents (i.e., water and ethylene glycol) and temperatures (i.e., 120 °C, 150 °C and 180°C). Different characterization methods were used to explain the difference in optical performance and photocatalytic property among the obtained samples. The results show that all the samples exhibit a similar band gap. The reaction solvent and temperature have a great influence on the surface morphology and optical property, leading to the different photocatalytic properties. ZnIn2S4synthesized at 120 °C in the solvothermal condition shows the optimal efficiency on Cr(VI) photoreduction due to the effective utilization of photo-induced carriers. The reasonable analysis and effective conclusion presented may provide the optimal synthesis method of ZnIn2S4to effectively remove Cr(VI) from water environment.Keywords:ZnIn2S4;Cr(VI);solvothermal;hydrothermal;photoreduction
研究领域:
环境科学
·
材料科学
✓ 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）