Advanced Optical Materials
·
2024
·Vol. 12
·期 27
·2401098
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IF 8
Meifeng Jiang,Xinle Lu,Maosheng Chen,Wenyi Tong,Hechun Lin,Chunhua Luo,Hui Peng,Chungang Duan
Crown ether-assisted supramolecular assembly is a robust strategy for manipulating low-dimensional metal halides. In this study, the supramolecular assembly of 0D-Cs 3 Cu 2 I 5 is presented. Upon the addition of 15-crown-5 (15C5) to Cs 3 Cu 2 I 5 , 15C5 immediately coordinates with Cs + to form the cone-shaped [(15C5)Cs] + . Simultaneously, one of the iodine atoms is removed from the [Cu 2 I 5 ] 3- cluster, resulting in the formation of a sub-planar rhombic [Cu 2 I 4 ] 2− unit. This process leads to white emission, specifically [(15C5)Cs] 2 [Cu 2 I 4 ], which exhibits a photoluminescence quantum yield (PLQY) close to unity. The [(15C5)Cs] + further reacts with 15C5 to form the sandwich-type cationic structure [(15C5) 2 Cs] + , accompanied by the generation of red emission [(15C5) 2 Cs] 2 [Cu 2 I 4 ]. By carefully controlling the amount of 15C5, various emission composites can be achieved, particularly tunable white emission. The assembly process is reversible. The pristine Cs 3 Cu 2 I 5 can be recovered after thermal curing because of the volatility of crown ether and the weak Cs-crown ether bond. Theoretical calculations have demonstrated that the coordination of the crown ether primarily affects the energy level, leading to changes in the excited state and photophysical properties. The applications in anticounterfeiting and LED phosphors have been demonstrated. This work provides a new approach for the development of low-dimensional copper halides with promising applications in optoelectronics.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhenyu Li,Huifeng Deng,Yu Jiang,Jianbin Ju,Xiaowen Huang,Lang Zhang,Guihua Ruan,Zhengyi Chen,Yipeng Huang
Portable fluorescence-based Cs + radionuclide sensing has received great concerns yet challenged by interference in complex sample matrices. Herein, a reliable method was established by in situ converting the preconcentrated Cs + to CsPbBr 3 perovskite nanocrystals in mesoporous silica modified with dibenzo 24-crown-8 ethers (DB24C8E-SiO 2 ), which combined the selective extraction of Cs + with in situ fluorescence derivatization to achieve good anti-interference ability. The high adsorption capacity (49.5 mg g −1 ) of DB24C8E-SiO 2 for Cs + and elution-free operation enabled enrichment factor up to 4500, which was conducive to reducing the limit of detection (LOD) for Cs + . By this method, the fluorescence intensity linearly increased with the Cs + concentration from 0.050 μg mL −1 to 100 μg mL −1 with an LOD of 0.017 μg mL −1 (S/N = 3). The concentration of Cs + in seawater sample was detected to be 0.056 μg mL −1 . The recoveries of Cs + in spiked samples remained above 88.90 % and the relative standard deviations were less than 12.06 %. In addition, the relative errors of this method were within ±13.2 % compared with the result from atomic absorption spectrometry. The study demonstrated the high potential of the method for removal and portable detection of Cs + .
研究领域:
分析化学
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环境科学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yangyang Bian,Yi Qiu,Jianfeng Zhang,Qiyu Meng,Li Wang,Shan Ni,Huizhou Liu,Liangrong Yang
The development of highly efficient adsorbents for the capture of 133 Cs and the removal of radioactive isotope 137 Cs from complex aqueous solutions is crucial for the chemical production and environmental remediation. Herein, Mo-based crystalline adsorbent with sub-nanometer (5.76 Å) channels was successfully prepared and used in electrochemically controlled Cs + separation process. Crystalline structures of MoIC (HNO 3 ) before and after adsorption of Cs + were clearly elucidated using powder X-ray diffractometer (PXRD). A more environmentally friendly electrochemical method was employed to achieve easy release and recapture of Cs + . Adsorption comparison experiments revealed that our material clearly outperforms the reported adsorbents for the removal or recovery of trace amount of Cs + (< 10 mg L −1 ). Furthermore, MoIC (HNO 3 ) also exhibited excellent selectivity for low concentration of Cs + over highly excess of competitive cations, such as Mg 2+ , Ca 2+ and K + , which are commonly distributed in brines. The maximum separation factors of Cs + /Mg 2+ , Cs + /Ca 2+ and Cs + /K + are 1.2 × 10 5 , 1.3 × 10 4 and 66, respectively. The remarkable selectivity can be attributed to the outstanding ion-sieving ability of sub-nanometer channels based on the differences in ionic radius and hydration energy of these cations. A real brine was introduced to further prove that one complete cycle of electrochemical adsorption and desorption can dramatically reduce the competing ions concentrations up to 980 times. We anticipate that our findings may give the prospect of opening up new path for the efficient separation of Cs + from brines using molybdenum-based adsorbent via electrochemically controlled process as a green and sustainable way.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kang Li,Chenxi Li,Yisa Liu,Jiong Dong,Lili Xu,Yanran Li,Ruixin Ma,Shina Li
The widespread application of nuclear energy has increased the risk of contamination by radionuclide 137 Cs. Prussian blue analogues are considered to be excellent materials for the removal of 137 Cs from wastewater due to their unique structure. In this work, Cs + adsorbent for PBAs with Fe-Co framework, potassium iron hexacyanocobaltate (PBA Fe ), was synthesized by room temperature precipitation method. Systematic structural characterization and performance results of PBA Fe showed that it has a specific surface area of 452.8 m 2 /g and an average pore size of 8.6 nm, providing more active sites for Cs + . The adsorption of Cs + on PBA Fe exhibited fast reaction kinetics (within 10 min) and high adsorption capacity (82.90 mg/g), and the removal rate of Cs + reached 98.57 %. The efficient removal of Cs + by PBA Fe in various real water environments showed its excellent selectivity and potential for practical application. In addition, adsorption mechanism studies showed that the adsorption of Cs + was achieved by ion exchange with K + in the PBA Fe lattice. PBA Fe has the advantages of simple synthesis and good selectivity, and has potential application in the harmless treatment of Cs + in radioactive wastewater.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zihan Bao,Yueshuai Wang,Jingcong Hu,Jiguo Geng,Sai Ma,Hehe Liang,Guoyu Huang,Bohai Tian,Jianrui Feng,Yue Lu,Manling Sui
The effective removal of the low-concentration formaldehyde (HCHO) in the indoor environment is a critical issue affecting the quality of people’s daily lives. In this study, heterojunction catalysts composed of manganese dioxide (MnO 2 ) and cesium tin iodine (CsSnI 3 ) nanocrystals were first synthesized and successfully used for photocatalytic HCHO degradation. After the full band light irradiation (150 mW/cm 2 ) for 3 h, the concentration of HCHO decreased from 7 ppm to a minimum of 0.03 ppm at room temperature (25 °C, 25 % RH, degradation efficiency reaches up to 99.6 %). Subsequent analysis using electron paramagnetic resonance (EPR) and transmission electron microscopy (TEM) revealed that the MnO 2 -CsSnI 3 heterojunction photocatalyst not only offers a Z-scheme charge-transfer pathway but also promotes the generation of a large number of •O 2 − and •OH. Compared to the single-phase material, the concentration of •O 2 − and •OH has increased by 1.5 times. This MnO 2 -based Z-scheme heterojunction photocatalyst provides a novel strategy for the degradation of low-concentration HCHO in practical indoor environments.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 12
·2125-2131
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IF 2.942
Chunyan Sun,Feng Zhang,Xiao Wang,Fangqin Cheng
Graphical A composite ammonium molybdophosphate/Al-MCM-41 material is synthesized by a one-pot method with natural clay as the silica and aluminum source. A modified “liquid-phase transport” step allows the use of impure natural clay as the starting material to produce pure product without sedimentation pretreatment. The composite material is effective for the adsorption of cesium ions from brine. Ordered hexagonal mesoporous aluminosilicate matrix (Al-MCM-41) with incorporated ammonium molybdophosphate (AMP) was successfully synthesized by a one-pot synthesis method with natural clay from low-grade potash ores of Qinghai salt lake as the silica and aluminum source. We introduced a modified “liquid-phase transport” step, which allowed the use of impure natural clay as a starting material to directly produce pure product without sedimentation pretreatment. The resultant product was characterized by X-ray fluorescence (XRF) spectroscopy, FTIR spectroscopy, XRD, TEM, 27 Al and 31 P magic-angle spinning (MAS) NMR spectroscopy, and N 2 adsorption/desorption, which indicated that the AMP was immobilized in the mesoporous structure of Al-MCM-41. The adsorption capacity of the final product for the removal of cesium ions in solution was also investigated. The results suggested that salt lake clay is a promising low-cost precursor for the production of mesoporous aluminosilicate supports through one-pot syntheses, and the final composite material is effective for the adsorption of cesium ions from solutions containing other alkali metal ions.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 8
·2501-2509
·
IF 4.4
Liu Wen-bo,Du Xue-rong,Wang Cheng-cheng,Zhuo Chun-xue,Chang Jin,Wang Na-na,Li Ren-zhi
Cesium copper halides have attracted increasing attention for light-emitting diodes (LEDs) applications due to their high photoluminescence quantum efficiency (PLQE) and non-toxicity. However, the current film fabrication methods for copper halides cannot simultaneously meet the high-performance, eco-friendly, and good environmental tolerance requirements. Here, we demonstrate a facile approach that combines the advantages of both traditional nanocrystal-based methods and precursor solution-based methods. Through treating Cs 3 Cu 2 I 5 nanocrystal films with proper alcohols, Cs 3 Cu 2 I 5 /CsCu 2 I 3 mixed-dimensional copper halides are formed with enhanced PLQE and improved energy level matching. This enhances the peak EQE of copper halide LEDs to 0.8%, which is among the highest efficiency of lead-free metal halide nanocrystal LEDs. This work provides a new strategy for fabricating high-performance lead-free LEDs in an eco-friendly manner.
研究领域:
材料科学
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光电技术
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DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 43
·6091-6095
·
IF 3.1
Jing Huang,Minghao Li,Zhanhui Liu,Jingyan Hua,Hui Zeng,Yunyun Chen,Jing Su
In this work, copper-based halides Cs2CuCl4, Cs2CuBr4 and mixed-halides Cs2CuCl2.8Br1.2, Cs2CuCl2Br2 and Cs2CuCl1.2Br2.8 single crystals were grown via the evaporation method using deionized water as a solvent. The structure and actual element component of the Cs2Cu(Cl, Br)4 crystals were studied using XRD and EDS. The halides of Cs2Cu(Cl, Br)4 exhibit both good light absorption and PL performance. The absorption peaks related to LMCT electron transition bands were observed, and the tunable band gap was obtained by adjusting the Br−/Cl− ratio. PL spectra show purple, blue, and green luminescence, and the luminescence mechanism was analyzed. Our study indicates that the Cs2Cu(Cl, Br)4 halides have application prospects in optoelectronic devices.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2024
·
IF 2.7
Hongmin Cui,Jianguo Xu,Nanfu Yan,Runhan Yan,Jinsong Shi
In the current work, we explored the direct synthesis of S-doped porous carbons employing cesium methanesulfonate as a novel bifunctional chemical activator. The obtained carbons showed high surface area (654–2264 m 2 /g) and high S content (6.56–15.13 wt%). Effects of activation temperature and cesium methanesulfonate amount on the carbons’ properties were also studied. The obtained carbons showed CO 2 uptake of 3.58–4.76 mmol/g at 0 °C and 1 bar. Effects of textural properties and S-doping on CO 2 adsorption performances were discussed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 105
·103382-103389
·
IF 3.289
Meng Li,Xiao Zhang,Simin Lu,Ping Yang
Colloidal fully inorganic cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite nanocrystals (NCs) have emerged as next generation candidates for photonics and optoelectronic applications. In this paper, deliberately partial or complete anion exchange reactions in cesium lead halide perovskites have been carried out at room temperature to create homogeneous solid solutions. Through adjusting chemical composition, the photoluminescence properties of the pre-synthesized cesium lead halide perovskite NCs can be tuned to cover the whole visible spectrum through controlling the ratio of parent cesium lead halide NCs and the halide precursors. By exploring the process of anion exchange, it can be concluded that the anion exchange reaction undergoes an inhomogeneous exchange process firstly and the added halide source in the solution is completely exhausted. Finally, the incoming halide will shuttle in the solution phase to reach the steady state and form the homogeneous resulting NCs. When the Br anions in the CsPbBr3 NCs were replaced by I anions, it is found that the phase composition changed gradually from a cubic to orthorhombic phase with increasing the amount of I anions. It is found that the effective anion exchange process in CsPbX3 NCs just takes place in the cubic phase rather than others.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2018
·
IF 14.357
Mei-Ling Feng,Debajit Sarma,Yu-Jie Gao,Xing-Hui Qi,Wei-An Li,Xiao-Ying Huang,Mercouri G. Kanatzidis
Unconventional ion exchangers can achieve efficient removal of [UO2]2+, Cs+, and Sr2+ ions from complex aqueous solutions and are of great interest for environmental remediation. We report two new gallium thioantimonates, [Me2NH2]2[Ga2Sb2S7]·H2O (FJSM-GAS-1) and [Et2NH2]2[Ga2Sb2S7]·H2O (FJSM-GAS-2), which present excellent ion exchange properties for [UO2]2+, Cs+, and Sr2+ ions. They exhibit high ion exchange capacities for [UO2]2+, Cs+, and Sr2+ ions (qmU = 196 mg/g, qmCs = 164 mg/g, and qmSr = 80 mg/g for FJSM-GAS-1, qmU = 144 mg/g for FJSM-GAS-2) and short equilibrium times for [UO2]2+ ion exchange (5 min for FJSM-GAS-1 and 15 min for FJSM-GAS-2, respectively). Both compounds display active ion exchange with [UO2]2+ in the pH range of 2.9–10.5. Moreover, the sulfide compounds could maintain high distribution coefficients KdU even in the presence of excess Na+, Ca2+, and HCO3–. The distribution coefficient KdU of 6.06 × 106 mL/g exhibited by FJSM-GAS-1 is the highest among the reported U adsorbents. The [UO2]2+-laden products can be recycled by conveniently eluting the uranium with a low-cost method. These advantages combined with facile synthesis, as well as β and γ radiation resistance, make FJSM-GAS-1 and FJSM-GAS-2 promising for selective separations in nuclear waste remediation.
研究领域:
环境科学
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材料科学
·
核化学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 21
·3264-3272
·
IF 3.382
Shuai Qi,Xiudi Xiao,Yuan Lu,Changmeng Huan,Yongjun Zhan,Hongsha Liu,Gang Xu
A simple one-step solvothermal route was developed to fabricate homogenous cesium tungsten bronze (Cs0.32WO3) nanoparticles, and an environmentally friendly aqueous solution was used to prepare transparent NIR shielding coatings. Based on the results, the addition of Cs+ ions promoted the formation of Cs2WOCl5 crystals, which inhibited the hydrolysis process of WCl6 and limited the formation of hexagonal tunnels. Controlled formation of hexagonal tunnels is favorable for Cs+ ions that completely enter the hexagonal vacant tunnels to form the Cs0.32WO3 crystals. Via a controllable formation process, the superior crystalline Cs0.32WO3 nanoparticles with the primary particle size of 30–60 nm were synthesized at the low temperature of 200 °C and short time of 4 h without any other additives. Furthermore, the Cs0.32WO3 nanoparticles were well dispersed in the aqueous solution, and the as-prepared coating exhibited a high SETS value (0.72), which remained constant with an increase in the film thickness. Simulated solar irradiation experiments revealed that the as-prepared film cut off over about 91.6% of radiation. The simulated model of the real environment revealed that compared with the ordinary glass and commercial Cs0.32WO3, the as-prepared Cs0.32WO3 film showed superior NIR shielding performance for practical application.
研究领域:
材料科学
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纳米技术
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光学工程
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环境科学
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表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）