NANOTECHNOLOGY
·
2023
·Vol. 34
·期 27
·275201
·
IF 3.5
Muhammad Amin Padhiar,Yongqiang Ji,Minqiang Wang,Shusheng Pan,Sayed Ali khan,Noor Zamin Khan,Lei Zhao,Fangrong Qin,Zhuan Zhao,Shaolin Zhang
Perovskite nanocrystals (NCs) feature adjustable bandgap, wide absorption range, and great color purity for robust perovskite optoelectronic applications. Nevertheless, the absence of lasting stability under continues energization, is still a major hurdle to the widespread use of NCs in commercial applications. In particular, the reactivity of red-emitting perovskites to environmental surroundings is more sensitive than that of their green counterparts. Here, we present a simple synthesis of ultrathin ZrO2 coated, Sr2+ doped CsPbBrI2 NCs. Introducing divalent Sr2+ may significantly eliminate Pb° surface traps, whereas ZrO2 encapsulation greatly improves environmental stability. The photoluminescence quantum yield of the Sr2+-doped CsPbBrI2/ZrO2 NCs was increased from 50.2% to 87.2% as a direct consequence of the efficient elimination of Pb° surface defects. Moreover, the thickness of the ZrO2 thin coating gives remarkable heat resistance and improved water stability. Combining CsPbSr0.3BrI2/ZrO2 NCs in a white light emitting diode (LED) with an excellent optical efficiency (100.08 lm W−1), high and a broad gamut 141% (NTSC) standard. This work offers a potential method to suppress Pb° traps by doping with Sr 2+and improves the performance of perovskite NCs by ultrathin coating structured ZrO2, consequently enabling their applicability in commercial optical displays.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhiwei Zhou,Bingchu Mei,Jinghong Song,Weiwei Li,Yu Yang,Guoqiang Yi
CaF 2 -SrF 2 hosts with substitution disorder of Ca 2+ /Sr 2+ sites in the lattice provide lower local symmetry for RE 3+ ions compared with pure CaF 2 or SrF 2 hosts, thereby facilitating more efficient 4f → 4f transitions. Here we report a study of effects of Sr 2+ content on microstructure and spectroscopic properties of Nd 3+ doped Ca 1-x Sr x F 2 transparent ceramic. Phase and microstructure analyses show that when x is in the range of 0–0.25, Nd: Ca 1-x Sr x F 2 nanoparticles keep pure CaF 2 phase with their size, morphology and agglomeration degree mildly changed. Increasing x from 0 to 0.2 significantly improves the luminescence intensity, emission lifetime and emission cross-section of Nd: Ca 1-x Sr x F 2 , however, hardly affects the concentration quenching. The luminescence intensities and emission lifetimes of x = 0.2 and 0.25 samples are very close, probably indicating SrF 2 phase has already formed in x = 0.25 sample. Based on the spectroscopic properties, the optimal Sr 2+ content is found to be x = 0.2.
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 Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 6
·1325-1334
·
IF 1.174
Song Yujun,Ou Hongxiang,Bian Weibai,Zhang Yunlei,Pan Jianming,Liu Yan,Huang Weihong
Surface ion-imprinting technique combined with a sacrificial support process was applied to synthesize Sr 2+ ion-imprinted polymers (Sr-IIPs) in which yeast cells were used as sacrificial supports. The synthesized polymers were characterized by Fourier transmission infrared spectrometry, scanning electron microscope, transmission electron microscope and nitrogen adsorption–desorption analysis. The results indicated that Sr-IIPs possessed a relatively good dispersion and large surface area. Batch mode adsorption experiments were carried out to investigate the specific adsorption equilibrium, kinetics and selective recognition properties of Sr-IIPs. Sr-IIPs exhibited a fast kinetics adsorption capacity and high selectivity for adsorption of Sr 2+ . Under optimal experimental conditions, the adsorption of Sr 2+ onto Sr-IIPs followed the pseudo-second-order kinetics model and was well-described by the Langmuir isotherm model. The monolayer adsorption capacity at 318 K was 60.61 mg g −1 for Sr-IIPs, which is over three-times that of NIPs. Thermodynamic parameters confirmed that the adsorption of Sr 2+ onto Sr-IIPs was a spontaneous and endothermic process within the studied temperature range (298–318 K).
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·Vol. 30
·期 27
·e202400261
·
IF 3.9
Yucheng Hao,Yongjian Chen,Xin Cao,Changlin Chen,Min Xu,Yuan Lin,Haijian Li,Kunhong Hu
Graphical A Remarkable potassium fluoroaluminate possesses an excellent adsorption selectivity ( K d =~6.1×10 4 mL ⋅ g −1 ) and a maximum adsorption capacity of ( q m =~120.32 mg ⋅ g −1 ) for Sr 2+ . Importantly, it still keep a very good selectivity for Sr 2+ ions even in the presence of competing Na + , Mg 2+ and Ca 2+ aqueous solutions. 90 Sr, as a typical artificial radionuclide, poses a serious threat to human health and the ecological environment. The selective removal of this radionuclide from industrial nuclear waste is crucial for our environment. Here we report a novel potassium fluoroaluminate, K 2 [(AlF 5 )H 2 O], which was synthesized by a simple low-temperature one-step method. It adopts a 1D AlF 6 -chain structure, which consists of exchangeable potassium ions in between the infinite chains of octahedral Al centers. As a remarkable inorganic ionic exchanger, K 2 [(AlF 5 )H 2 O] has a high chemical stability (resistance of pH=~3-12) and thermal stability (≥~300 °C). It possesses an excellent adsorption selectivity ( K d =~6.1×10 4 mL ⋅ g −1 ) and a maximum adsorption capacity of q m =~120.32 mg ⋅ g −1 for Sr 2+ . Importantly, it still keep a very good selectivity for Sr 2+ ions even in the presence of competing Na + , Mg 2+ and Ca 2+ aqueous solutions. K 2 [(AlF 5 )H 2 O] is the first example of fluoroaluminate ionic exchange materials that can capture Sr 2+ . This result opens up a new way to design and synthesize inorganic ionic exchangers for the selective removal of Sr 2+ ions from radioactive waste water.
研究领域:
环境科学
·
材料科学
·
核工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xingjie Lu,Zhen Liu,Xin Wang,Yuekun Liu,Hongchao Ma,Meiwen Cao,Wentao Wang,Taihong Yan
Novel MnO 2 @ZIF-8 nanocomposites were synthesized for efficient adsorptive removal of Sr 2+ from aqueous solution. ZIF-8 nanoparticles with controlled morphology and size were first synthesized by using amino acids to modulate the crystal nucleation and growth. Then, a layer of MnO 2 nanoparticles were deposited on ZIF-8 surface by using the adsorbed amino acid molecules as binding sites to mediate MnO 2 mineralization and by adjusting the reactive KMnO 4 concentration to control the size and surface density of the MnO 2 nanoparticles . The as-prepared MnO 2 @ZIF-8 nanocomposites showed a core-shell structure and displayed superior performance in Sr 2+ adsorption and removal from aqueous solution. The adsorption process can be described well by the pseudo-second-order equation. The adsorption isotherm accords well with the Langmuir model and the maximum adsorption capacity can reach 65.7 mg/g. The study paves a new way to develop novel inorganic nanocomposites as highly efficient and potential adsorbents for the treatment of radionuclide-containing wastewater.
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
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Ying Cheng,Bing-Yue Fan,Yu-Ling Qi,Guo-Zhi Han
Among the nuclides in radioactive wastewater, strontium (90Sr) is a highly toxic water-soluble fission product, which will be extremely harmful to the ecological environment and consequently bring great risk to human health. Therefore, the removal of the strontium element from the aquatic environment is increasingly attracting the attention of the scientific community. In this paper, using poly(vinyl alcohol) (PVA) and chitosan (CS) as raw materials and glutaraldehyde as a cross-linking agent, a kind of interpenetrating PVA/CS hydrogel microsphere was prepared by a facile reversed-phase emulsion method. On this basis, the mechanical strength and stability of the hydrogel microspheres were further enhanced by a freezing–thawing technique. It was discovered that synthetic hydrogel microspheres can effectively remove Sr2+ ions from radioactive wastewater. The influences of the mass ratio of PVA to CS, initial concentrations of Sr2+, pH value, and adsorption times, along with competitive metal ions and nuclides, on the adsorption performance of the hydrogel microspheres were further systematically investigated. Especially, it was found that the freezing–thawing process significantly improved the adsorption capacity of the hydrogel microspheres for strontium ions, and the maximum adsorption capacity of the PVA/CS hydrogel microspheres for Sr2+ was as high as 205.45 mg/g, which was superior to the results of most similar adsorbents at present. Especially, the PVA/CS hydrogel microspheres still maintained satisfactory adsorption capacity and a high degree of sphericity after seven cycles. Furthermore, through the analysis of kinetics and thermodynamics of the adsorption process, a plausible adsorption mechanism was proposed, which will be helpful for designing and constructing adsorbents to remove radioactive ions from aquatic environments.
研究领域:
环境科学
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材料科学
·
核废物处理
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水污染控制
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吸附技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junhui Tan,Rongxia Huang,Yejing Dai,Zhihao Liang,Jin Feng,Hua-Tay Lin
Lead-free piezoelectric ceramics of the [0.852(Bi 0.5-x Sr x Na 0.5 )-0.11(Bi 0.5 K 0.5 )-0.038Ba]Ti (1-x) Ta x O 3 (designated as BNKT-BT-xTaSr) ternary system were prepared with co-doping of Ta 5+ and Sr 2+ . The purpose of this study is to investigate the effects of co-doping of Ta and Sr element on the microstructure, phase structure electrical properties, and electrostrain behavior of BNKT-BT-xTaSr ceramics. With the increase of Ta 5+ and Sr 2+ doping, the transition temperature ( T F-R ) of the modified doped BNKT-BT-xTaSr ceramics from ferroelectric to relaxed phase decreases to below room temperature (RT). When x = 0.005, the BNKT-BT-xTaSr ceramics reached a large electrostrain of 0.46%( d * 33 = 657 p.m./V) at RT under an electric field of 7 kV/mm, which is caused by the transition from ergodic relaxor phase to ferroelectric phase under a high applied electrical field. In addition, the electrostrain is increased to 0.48% ( d * 33 = 685 p.m./V) under the same electric field after the thermal aging process at 80 °C for two weeks. This study demonstrates that the A/B site co-doping could effectively improve the electrostrain properties of BNKT-BT-xTaSr ferroelectric ceramics .
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 5
·1222-1237
·
IF 3.4
Minjuan Chen,Jianxian Zeng,Zhenwei Wu,Rui Zhang,Zhengqiu Yuan,Xiaoping Huang,Kai Jin,Shengkai Yang,Yahong Li
BACKGROUND Developing new materials for separating Sr 2+ ions from aqueous solutions is significant. Metal–organic frameworks are regarded as excellent adsorption materials due to their high specific surface area and abundant adsorption sites. In this work, a novel UiO-66-(COOH) 2 -based mixed matrix membrane (MMM) was prepared by combining UiO-66-(COOH) 2 with polyethersulfone (PES) for separating Sr 2+ . RESULTS The MMMs were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy and water contact angle and water flux measurements. Various contents (0–2.5 wt%) of UiO-66-(COOH) 2 were blended into PES membranes. The results showed that incorporating UiO-66-(COOH) 2 significantly increased membrane porosity and water flux, and reduced contact angle. The membrane (M4) that contained 2.0 wt% UiO-66-(COOH) 2 exhibited an excellent morphology and the highest Sr 2+ uptake capacity (111.9 μg cm −2 ). Adsorption kinetics and isotherms showed that the nature of the adsorption of the membrane towards Sr 2+ was chemisorption, homogeneous and monolayer. Compared with the adsorption capacity of UiO-66-(COOH) 2 towards Sr 2+ in adsorption packed column, these values of M4 decreased by about 75% during membrane filtration. The rejection performance of MMMs increased with increasing UiO-66-(COOH) 2 content. Breakthrough curves of MMMs were not correlated with flow rate in the range of 10–180 mL h −1 . The presence of Ca 2+ and Mg 2+ ions did not obviously affect the separation of Sr 2+ , but Pb 2+ had a significant influence. Furthermore, after five adsorption–desorption experiments, the regeneration remained at about 95% of initial values. CONCLUSIONS The MMMs showed good adsorption capacity for Sr 2+ and exhibited favorable reusability and stability. © 2023 Society of Chemical Industry (SCI).
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Y.C. Hu,H.Y. Wang,X.W. Wang,G.L. Song,J. Su,Y.W. Cui,H. Ma,F.G. Chang
Ordered double-perovskite oxides of Sr 2− x K x FeMoO 6 (0.00 ⩽ x ⩽ 0.10) are synthesized via sol–gel method. X-ray powder diffraction analysis shows that all the samples have a single phase and exhibit I4/m symmetry. The cation order of Sr 2− x K x FeMoO 6 decreases from 94.4(2)% to 50.4(2)%, indicating that Fe/Mo is in nearly complete disorder. The magnetic property of Sr 2− x K x FeMoO 6 samples depends on temperature under zero-field-cooling (ZFC) and field-cooling (FC) processes at an applied magnetic field of 100 Oe. The thermal irreversibility behavior in the FC and ZFC curves indicates a typical cluster glass behavior in this system. The H / M versus M 2 curves indicate a second-order magnetic transition, resulting in a small variation in magnetic entropy. Antisite defect is the primary reason for the effective paramagnetic moment.
研究领域:
材料科学
·
固体物理
·
无机化学
·
磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Qian Yi,Jiang Qingqing,Xiang Shimeng,Lu Zhenhao,Xu Xiaowen,Yang Jing,Dai Guoliang,Song Ruifeng,Jiang Ji
Separating CO 2 and N 2 from CH 4 is crucial for energy production and environmental protection. This study showed the rapid synthesis of CHA zeolites with different morphologies using an in situ growth method, without the assistance of organic structure directing agents (OSDA) or fluoride media. The crystallization behavior of CHA zeolites was studied in terms of synthesis gel composition (including water content, silicon and aluminum content, alkalinity and Sr 2+ concentration), synthesis temperature and duration. The results suggested that pure phase CHA zeolite nano-aggregates could be synthesized with broad precursor conditions at 150 °C for only 4 h. Then, K-CHA zeolite was ion-exchanged to Na-CHA and Ca-CHA and the adsorption properties of CHA zeolites with different morphologies and ions were studied. The results suggested that Na-CHA exhibited highest CH 4 , CO 2 and N 2 adsorption capacity and showed higher ideal selectivity for N 2 /H 2 ; Although Ca-CHA zeolites exhibited relative lower CO 2 and CH 4 adsorption capacity, it exhibited the highest ideal selectivity for CO 2 /CH 4 ; Simultaneously, K-CHA zeolite exhibited high CH 4 adsorption capacity and high adsorption separation ability of CH 4 /N 2 . Furthermore, breakthrough experiments have confirmed the practical feasibility of separating CO 2 from CH 4 .
研究领域:
材料科学
·
化学工程
·
吸附与分离
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分子筛合成
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气体分离
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 21
·2112717
·
IF 19.924
Yi-Ming Zhao,Lin Cheng,Kai-Yao Wang,Xin Hao,Juan Wang,Jia-Ying Zhu,Meng Sun,Cheng Wang
Switchable coadsorption and separation for elimination/partitioning of Cs + and Sr 2+ is achieved by pH-controlled ion exchange using a potassium thioantimonate K 2 Sb 4 S 7 ·2H 2 O ( SbS-1K ) with fantastic pH durability from diluted NaOH (pH 12) to concentrated HCl (3 m ). At pH 6, SbS-1K exhibits ultrafast adsorption kinetics ( R ≈ 90% in 2 min for Cs + and 20 min for Sr 2+ ) and high removal rates ( R ≈ 98–99%) at equilibrium for both Cs + and Sr 2+ . At pH 2, the Sr 2+ adsorption is inhibited by H + with a great loss in R Sr to 11.18%, whereas the R Cs remains at 96.99%, contributing to a top-ranked separation factor SF Cs/Sr of 256. The SbS-1K -filled ion exchange column can be switched between the eliminating ( R Cs > 99.91%; R Sr > 98.19%) and separating ( R Cs > 98.99%; R Sr ≈ 0±3%) modes for treating continuous flow with a variation from pH 6 to pH 2 or vice versa. The SbS-1K /PTFE membrane exhibits coadsorption and separation effects for filtration of low concentrated mixed Cs + and Sr 2+ solution (1 ppm for each), even at an ultrafast vacuum filtration speed (30 mL min –1 ). Combined with easy synthesis and high β/γ irradiation resistance, SbS-1K represents a new-concept bifunctional exchanger with discriminating intelligence for equipment innovation.
研究领域:
环境科学
·
材料科学
·
核废料管理
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Kai-Yao Wang,Yang Liu,Jia-Ying Zhu,Lin Cheng,Cheng Wang
Deep investigations on the synthetic and structural chemistry of heterometallic chalcogenidostannates bear fundamental significance for the establishment of the structure–property relationship that would offer guidance on the functional material innovation. Presented here are four ammonium- and/or alkylammonium-directed M–Sn–Q (M = Zn, Cd; Q = S, Se) compounds, namely, [NH4]7[H3O]3Zn4Sn4S17 (1), [NH4]5[(CH3)2NH2]Zn4Sn5S17 (2), [CH3CH2NH3]22Zn16Sn12Se51(H2O)4·16H2O (3), and [NH4]2CdSnSe4 (4). All four compounds were synthesized in deep eutectic solvents (DESs) or ethylamine aqueous solution, both of which function simultaneously as reaction media and structure-directing agents. Compound 1 consists of discrete P1-[Zn4Sn4S17]10– clusters templated by mixed [NH4]+/[H3O]+ cations. In compound 2, such P1 clusters are bridged by Sn4+ ions in a 4,4-connection mode to form a [Zn4Sn5S17]n6n– framework with three types of cavities (I–III) varying in size. The two smaller cavities (I and II) accommodate NH4+ while the larger one(III) is occupied by [(CH3)2NH2]+, reflecting the rational size-dependence of cations on cavities. Compound 3 features an [Zn16Sn12Se51(H2O)4]n22n– open framework constructed from the 4,3-connection of P1-[Zn4Sn4Se17]10– clusters and {Zn(H2O)}2+ bridges. This linkage mode contributes to a large cage-like subunit (inner dimension: 21.99 × 9.06 Å2) and therefore an ultrahigh porosity that are occupied by [CH3CH2NH3]+ cations and water molecules (volume fraction: 57.7%). Compound 4 exists as a stacking of [CdSnSe4]n2n– chains, which are composed of alternatively arranged {CdSe4} and {SnSe4} tetrahedra, in combination with [NH4]+ cations as both charge-compensating and space-filling agents. Detailed synthetic, structural, and topological analyses were performed on these solid materials, coupled with extensive investigations on their optical and thermal properties. Compound 3 exhibits an efficient Sr2+ adsorption performance, featuring ultrafast kinetics (94.69% in 5 min), high removal rate (98.57% in 20 min) at equilibrium, and high capacity (104.17 ± 23.53 mg g–1).
研究领域:
无机化学
·
材料科学
·
环境化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）