JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Xiaobo Hu,Yanqiao Xu,Jiancheng Wang,Jiaxin Ma,Lianjun Wang,Wan Jiang
All-inorganic CsPbX 3 (X=Cl, Br, I) perovskite nanocrystals (NCs) exhibit attractive optoelectronic properties for lighting and displays application but suffer from the lack of profound insights into their reaction kinetics. Herein, a modified ligand-assisted reprecipitation (LARP) method was developed to synthesize high-quality CsPbBr 3 NCs by utilizing oleic acid (OA) and n-octylamine (OTAm) as surface ligands, and the effect of Cs/Pb ratio, precursors and ligands concentration on the structure, morphology and fluorescence properties was systematically investigated. The monodisperse CsPbBr 3 NCs with cubic shape and average particle size of 13.7 nm are obtained by optimizing the reaction parameters. Appropriately increasing the Cs/Pb ratio and precursors concentration to 0.5 and 1.0 mM are favorable for forming a more complete crystal structure with lower defect states density, which can significantly enhance the PL intensity. Notably, the surface defect states of CsPbBr 3 NCs are effectively passivated by the coordinated OA and OTAm ligands, and the maximum photoluminescence quantum yield (PLQY) can reach to 85.2%. Importantly, the effective synthesis of high-quality CsPbBr 3 NCs can be amplified up to 50 times of reaction volume after finely optimizing the reaction parameters. Based on a facile anion exchange process, the CsPbX 3 NCs with variable halogen composition exhibit tunable emission of 443.3∼649.1 nm and a wide color gamut of 117% NTSC standard. This work provides profound sights on the reaction kinetics of perovskite NCs, and further promotes its practical application in optoelectronic field.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fang Chengqian,Dai Yimin,Chen Ling,Wang Zhiheng,Lu Qi,Li Yaqi,Cai Ling,Liu Bo,Zhang Yue-Fei,Li Yan,Wan Li
A magnetic Cl − -intercalated Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH nanocomposite has been successfully synthesized by modified one-step salt-assisted coprecipitation process. The Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH nanocomposite was characterized by FTIR, XRD, XPS, SEM, HRTEM, BET and VSM. The results showed that the Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH particles possessed core (Fe 3 O 4 @SiO 2 ) shell (Cl − -LDH) structures and magnetic properties, and Cl − anions were successfully introduced into LDH interlayers. The unique intercalated structure with week interlayer interaction of Fe 3 O 4 @SiO 2 @MgAl-Cl − LDH provide efficient adsorption of methyl orange (MO), Congo red (CR) and methyl blue (MB), leading to its superior performance with much higher uptake capability with the maximum adsorption capacity of MO, CR and MB reaching 733 mg·g −1 , 910 mg·g −1 and 385 mg·g −1 , respectively. The adsorption process could be well described by pseudo-second-order model for MO, CR and MB. The experimental data of MO and CR could be fitted better with Freundlich model, while that of MB were fitted better with Langmuir model. The adsorption process was spontaneous and exothermic for MO and MB, while spontaneous and endothermic for CR. Moreover, the adsorbent exhibits excellent stability and reusability in the regeneration cycle, and a process called ‘‘post-processing step” is proposed to effectively improve the dye removal ability of the adsorbent in reuse. This study puts forward a new thought for the development of high-performance LDH adsorbents with mesoporous and Cl − intercalation structure for the efficient and rapid removal of dyes.
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2021
·
IF 2.991
Jinxia Wang,Xiangyue Liu,Hongwei Xie,Huayi Yin,Qiushi Song,Zhiqiang Ning
The magnetohydrodynamic (MHD) effect was usually used to improve the mass transport during electrodeposition in a solution electrolyte. Herein, we reported the effect of a magnetic field on the electrode process of Al electrodeposition in a [Emim]Cl-AlCl3 ionic liquid composed of pure ions. Under a uniform and perpendicular magnetic field to the Cu electrode plane, electrochemical impedance spectroscopy (EIS) of the circuit, the cyclic voltammetry (CV) curves, and the different capacitances at the potential of zero charge (PZC) were measured, and the electrodeposition of aluminum was carried out at a constant current density. The results indicated that a vertical magnetic field significantly reduced the resistance (activation energy) for charge transfer of electrochemical reduction of Al2Cl7–; meanwhile, the capacitance of an electric double layer (EDL) and the density of the electrodeposited aluminum layer were increased.
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PubMed
高影响因子
CORROSION SCIENCE
·
2023
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IF 8.3
Shupei Liu,Xinfang Zhang,Jinsong Rao,Liang Yu,Wei Lu,Huan Zhou,Shibo Chen,Yuxin Zhang,Xiaoying Liu
Ni-Co Layered Double Hydroxide (LDH) shows great application potential in the field of anti-corrosion. However, the poor carrying capacity limits the performance of anticorrosion performance. In this study, Ni-Co hydrotalcite was grown on the surface of DE, and Ni-Co/DE@SP microcapsule with corrosion inhibitor loading up to 14.7% was successfully prepared. The adsorption capacity of Ni-Co/DE@SP for Cl − in 600 mmol/L NaCl solution was 6.72 mmol/g. It is worth noting that the impedance modulus of the prepared composite coating (EP/Ni-Co/DE@SP) is two orders of magnitude higher than that of the pure resin coating, and the wear resistance was improved by 33%.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Jin Chen,Xuelong Lv,Wenjian Xu,Xiaolan Li,Jing Chen,Hongpeng Jia
The exploit of simple method to synthesize and recover catalyst is meaningful to widespread application of environmental catalysis. Different from traditional knowledge about deposition of Ag cation by Cl anion, we find that Cl anion coordinates with Ru and Ag cations simultaneously to micro-micelles and results in homogeneously alloying of bimetals. The Ru-Ag alloy exhibits a remarkable activity and stability in propane catalytic oxidation at moderate condition, but is still inactivated by extremely-high temperature and humidity due to metal sintering and oxidation as well as support reconstruction. Fortunately, utilization of Cl coordination to extract and combine bimetals at redox condition is proved as a feasible and simple way to regenerate the thermally-inactivated catalyst. With in-situ characterization, the synergic effect between Ru and Ag on propane oxidation obeying Mars-van-Krevelen mechanism is revealed. Through monolith test, the practice application of Ru-Ag catalyst prepared via Cl-assisted method is thought to be promising.
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Catalysts
·
2021
·Vol. 11
·期 6
·661
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IF 4.146
Xi Lin,Yanxia Li
In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid to photocatalytic technologies. In this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2as the carrier, silver ions as dopants and ionic liquids (IL) as modifiers. The morphologies, microstructures, crystalline structure and optical properties of the TiO2/Ag[BMIM]Cl nanospheres are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), total organic carbon (TOC), and UV-vis diffuse reflectance spectrum (UV-vis DRS) techniques. The TiO2/Ag[BMIM]Cl nanocomposites can selectively degrade rhodamine B (Rh B) under visible light because of the unstable quaternary ammonium salt. The as-obtained nanocomposites exhibit better photocatalytic activity performance than pure TiO2, TiO2/IL, and TiO2/Ag+. The experimental results show that the Rh B degradation rate can reach 98.87% under optimized producing conditions by using the TiO2/Ag[BMIM]Cl composites as the catalyzer. It shows that simultaneous doping with silver ions and ionic liquids can significantly improve the photocatalytic activity of TiO2in Rh B degradation, indicating the formation of photosensitive AgCl in the process of TiO2/Ag[BMIM]Cl preparation. Ag+and IL addition exchange the band gap of TiO2and lengthen the visible wavelength range of the composite. The material has the advantages of low cost, facile preparation and reusability with the excellent degradation effect of Rh B.Keywords:TiO2/Ag[BMIM]Cl composites;rhodamine B;visible photocatalytic degradation
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 8
·1216-1226
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IF 1.887
Shuang Xu,Ai-Min Pang,Zhuo Wu,Hai-Tao Li,Wei Li,Jie Kong
Two types of bonding agents were synthesized based on polyetheramines (PEAs), which aim to increase the strain of AP/CL-20/GAP formulation. The PEAs, terminated with cyano (CTPEA) and Schiff base (SBPEA) groups, were applied in the AP/CL-20/GAP formulation, respectively. The results showed that the bonding agents TCN-403 (CTPEA) and TBA-403 (SBPEA), which were prepared from trifunctional PEA named as T-403, could significantly increase the maximum elongation ratio of the formulation. The differences between the TCN-403 and TBA-403 were analyzed by DMA of the formulations, SEM of the coated fillers, and in-situ tensile test, indicating that the Schiff base bonding agents can effectively inhibit the dewetting of the binder from the solid particles in the formulations.
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CHEMOSPHERE
·
2020
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IF 5.778
Xiaobo Min,Mingfei Zhu,Yingjie He,Yunyan Wang,Haoyu Deng,Sheng Wang,Linfeng Jin,Haiying Wang,Liyuan Zhang,Liyuan Chai
Electro-adsorption is attracting increasing attention as an emerging technology for removing ionic species from water but suffer from low selectivity . In this work, a bismuth/reduced graphene oxide nanocomposite electrode was fabricated by a facile and green method. Based on this material, an electrode with improved selectivity by electrochemistry deionization system was successfully fabricated. The bismuth nanoparticles were uniformly covered with reduced graphene oxide plates and the ratio of Bi on the whole materials is 79.56%. Bismuth/reduced graphene oxide showed ions selectivity in the order of Cl − > F − ≫ SO 4 2 − . The average Cl − removal capacity can reach as high as 62.59 mg g −1 . Moreover, bismuth/reduced graphene oxide electrodes have good regeneration performance. Typically, in the 10 adsorption-desorption multicycles, the salt absorption/desorption capacity of the hybrid capacitive deionization system is stable and reversible. This research opened a hopeful window to design and synthesize effective materials to selectively remove the ionic species to purify the water.
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PubMed
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Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 16
·2969-2978
·
IF 5.958
Jie-hao Li,Jie Ren,Ying Liu,Hui-ying Mu,Rui-hong Liu,Jun Zhao,Lan-ju Chen,Fa-tang Li
In this paper, a novel ionic liquid-assisted solvothermal method to prepare Cl-doped bismuth oxycarbonate (Bi2O2CO3) is presented. The ionic liquid of [Hnmp]Cl not only enhances the solvothermal process to help the formation of Bi2O2CO3, but also provides chloride element as a dopant. XRD and XPS show that all three samples are Bi2O2CO3 with high purity. XPS, solid EPR, and TEM results prove that Cl is doped into the Bi2O2CO3 lattice and oxygen vacancies are generated. DRS results show that after Cl doping, the absorption of visible light by Bi2O2CO3 is enhanced. Surface photovoltage (SPV) and transient photocurrent tests show that as the doping amount of Cl increases, the separation efficiency of photogenerated electron–hole pairs over Bi2O2CO3 improves. The photocatalytic activity of Bi2O2CO3 is evaluated by the degradation of rhodamine B, which is increased after Cl doping. This work would broaden the application of ionic liquids in the solvothermal process and deepen the understanding of anionic ion doping in Bi2O2CO3.
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ACS Catalysis
·
2021
·
IF 13.084
Yiwen Yang,Haifeng Qi,Huixiang Li,Zhanwei Xu,Xiumei Liu,Shuyin Yu,Zongchao Conrad Zhang
Efficient hydrolysis of β-1,4-glycosidic bonds of cellulose is a pivotal step in biorefineries of cellulosic biomass. In this work, we discovered that paired PdCl2–CuCl exhibited excellent synergetic catalytic activity over the single PdCl2 or CuCl in the hydrolysis of β-1,4-glycosidic bonds in 1-butyl-3-methylimidazolium chloride ([BMim]Cl) and further investigated the catalytic species in this system. The catalytic activity increased and reached a plateau at a CuCl/PdCl2 ratio of 1 with increasing molar ratio of CuCl/PdCl2 while keeping the Pd concentration constant. A combination of experimental evidence based on in situ far-infrared absorption, X-ray absorption, X-ray photoelectron, and electron paramagnetic resonance spectroscopies and DFT calculations demonstrate the coupling reaction between [PdIICl4]2– and [CuICl3]2– via the Cl bridge to form the heterometallic complex anion [Cl2PdII–Cl–CuICl2]2–. The heterometallic species is stable during the reaction and maintains its catalytic performance in the presence of various oxygenate additives. Using paired PdCl2–CuCl as a catalyst, the activation energy of hydrolytic cleavage of β-1,4-glycosidic bonds of cellobiose is determined as low as 95.8 kJ/mol. PdCl2–CuCl/[BMim]Cl combined with CrCl3 can be reused five times in cellobiose conversion to 5-hydroxymethylfurfural (5-HMF) without an apparent decrease of catalytic activity. The performance of this catalytic system is further verified for efficient cellulose conversion. More than 60% product yield is obtained at 100 °C from the cellulose, affording monosaccharides for efficient production of high value-added chemicals, such as 5-HMF, when CrCl3 is present to catalyze the conversion of glucose to 5-HMF.
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Jidong Deng,Jiao Xun,Rongxing He
All-inorganic cesium lead halide perovskite nanocrystals (NCs) are promising photoelectric materials for their high photoluminescence quantum yield (PLQY), narrow emission width and tunable optical band gap. Traditionally, the hot injection (HI) method has been utilized to prepare perovskite NCs. However, the HI method requires high temperature, protection under inert gas and other harsh synthetic conditions, which severely hinders large-scale production of these NCs. Herein, we directly synthesized CsPbBr 3 perovskite NCs by a modified LARP (ligand-assisted re-precipitation) approach, and then conducted a specific anion exchange reaction with inexpensive, readily available, non-toxic, and non-polluting KX (X = Cl, I) salts aqueous solution to obtain various compositions of CsPbX 3 perovskite NCs at room temperature (RT). The obtained RT-NCs have high PLQY and outstanding stability, and their photoluminescence can be precisely regulated across the whole visible region (419–670 nm). The use of inorganic salts for the ion exchange provides an efficient method for the design of various halogenated perovskite NCs and their large-scale synthesis at RT.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 5
·4446-4454
·
IF 2.195
Wang Kai-Li,Li Yan,Sun Tao,Mao Fang,Wu Ji-Kui,Xue Bin
Co-doping is a promising approach to change the electronic structure and increase the photocatalytic ability of graphitic carbon nitride (g-C 3 N 4 ). Here, we reported a facile and green fabrication of Na, Cl co-doped g-C 3 N 4 photocatalysts. In the fabrication, sodium and chlorine were incorporated into g-C 3 N 4 synchronously. The bandgap of Na, Cl co-doped g-C 3 N 4 decreased compared with pure g-C 3 N 4 and the position of the valence band moved in the direction of enhanced oxidizing power. The co-doped photocatalysts exhibited the improved visible-light absorption and the reduced recombination rate of photogenerated electrons and holes. As a result, photocatalytic activity of Na, Cl co-doped g-C 3 N 4 was remarkably improved for the photodegradation of rhodamine B and tetracycline hydrochloride under visible light irradiation. The photocatalysis mechanism of Na, Cl co-doped g-C 3 N 4 was also discussed according to the results of active species trapping experiments.
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