RSC Advances
·
2015
·Vol. 5
·期 19
·14631-14636
·
IF 3.84
Haiyan Kang,Xianli Wang,Yan Zhang,Junfeng Wu,Hongqiang Wang
Considering bisphenol A (BPA) and tetrabromobisphenol-A (TBBPA) are ubiquitous environmental pollutants and widely manufactured into packaging materials, foodstuffs may be polluted by BPA and TBBPA. Additionally, there are very limited analytical methods for determining TBBPA in commercial milk samples. In this study, a rapid, simple and efficient method based on microwave-assisted ionic liquid microextraction (MAILME) combined with high-performance liquid chromatography (HPLC) was first applied to the simultaneous analysis of BPA and TBBPA in commercial milk samples. To achieve the optimum extraction performance, the experimental parameters of the MAILME, including type and amount of ionic liquid, microwave power, extraction time, pH and salt concentration in the sample, were evaluated and optimized. Under the optimum conditions, the detection limits were 0.01 and 0.02 μg L−1, and the quantification limits were 0.03 and 0.05 μg L−1 for BPA and TBBPA, respectively. The proposed method had good repeatability and reproducibility with RSDs lower than 5.6%. The recoveries of the analytes in the aged milk samples varied from 79.8 to 97.3%. The proposed method has been applied successfully to the determination of BPA and TBBPA in commercial milk samples with recoveries ranging from 78.2 to 99.8%. Compared with the other previous methods, the proposed method did not need to remove the fats and proteins in the milk, which made the sample pretreatment simple and rapid (5.0 min). And it also avoided the use of organic solvents. The proposed approach provides a new and promising alternative for simultaneously determining trace amounts of BPA and TBBPA in commercial milk samples or other similar samples.
研究领域:
分析化学
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环境科学
·
食品科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 39
·14737-14745
·
IF 8.067
Mengyu Guan,Yunlong Xie,Yupeng Wang,Zhuojie He,Lei Qiu,Jun Liu,Keqiang Chen,Shaojiu Yan,Guogang Li,Zhigao Dai
All-inorganic perovskite nanocrystals (NCs) are considered as new candidates for low-cost semiconductor luminescent materials. Plentiful efforts have been made to improve the efficiency of perovskite NCs and reveal the mechanism by ion doping with the same valence and different ionic radii. However, only a few selected metal ion dopants can efficiently enhance the luminescence performance of NCs, and some underlying mechanisms are not clear. Here, we employ the opposite strategy to show how to enhance the photoluminescence quantum yield (PLQY) of CsPbBr3 NCs via Sr2+ and La3+ with similar ionic radii and different valence states. With the optimization of doping conditions, the PLQY of divalent Sr2+ and trivalent La3+ doped CsPbBr3 NCs can increase to 87%, but the enhancement mechanisms are the reduction of bromine vacancy defects in the bulk and surface of CsPbBr3 NCs to increase radiative recombinations, respectively. Divalent Sr2+ doping can eliminate halide vacancies and decrease the formation of defect states and nonradiative recombinations. Based on this mechanism, in order to achieve charge balance, trivalent La3+ doping establishes Br-rich conditions due to the absorptive effect of Br, and forms CsPbBr3@Br− NCs as the core–shell-like structures, which induces self-passivation of surface defects, thereby increasing the radiative recombination on the surfaces. Density functional theory calculations confirm the experimental conclusions, showing that Sr2+/La3+ dopants enrich the conduction band edge states of CsPbBr3, resulting in enhanced photoluminescence. This work sheds light on the highly efficient luminescence of divalent and trivalent metal ion-doped halide perovskite NCs and their enhancement mechanisms, illustrating their potential applications in fluorescence anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yalin Wu,Chunmao Chen,Qingxiang Zhou,Qing X. Li,Yongyong Yuan,Yayan Tong,Hongyuan Wang,Xianqi Zhou,Yi Sun,Xueying Sheng
Polyamidoamine dendrimer decorated Fe 3 O 4 magnetic nanoparticles were successfully synthesized by Michael addition with methyl acrylate and amidation with ethylenediamine . The decorated magnetic particles were utilized as an effective adsorbent for magnetic solid-phase extraction of tetrabromobisphenol A and 4-nonylphenol at trace levels from environmental water samples. A number of parameters such as generation number, ionic strength , adsorbent dosage, eluent , adsorption time, elution volume, elution time, pH, humic acid and sample volume were optimized. Under the optimal conditions, a wide linearity was achieved in the range of 0.1–500 μg L −1 of the analytes with the correlation coefficients (R 2 ) of 0.9985–0.9995. The limits of detection were approximately 0.011 μg L −1 of tetrabromobisphenol A and 0.017 μg L −1 of 4-nonylphenol. Satisfactory average recoveries of the analytes ranged from 93.2% to 101.1%. The results indicated that the decorated magnetic nanoparticles can be suitable for extraction of phenols from environmental water samples. The proposed method was sensitive, effective, practical and robust for the determination of tetrabromobisphenol A and 4-nonylphenol in environmental water samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2019
·Vol. 12
·期 4
·2569-2577
·
IF 6.97
Aijing Gao,Jia Yan,Zhaojin Wang,Pai Liu,Dan Wu,Xiaobing Tang,Fan Fang,Shihao Ding,Xiang Li,Jiayun Sun,Meijuan Cao,Liduo Wang,Luhai Li,Kai Wang,Xiao Wei Sun
Printable perovskite quantum dot (QD) ink is very important for achieving high quality coffee ring-free fluorescent microarrays for different kinds of emerging perovskite optoelectronic applications using inkjet printing. In this work, we prepared a printable CsPbBr3 perovskite QD ink by mixing high-boiling point dodecane with low-boiling point toluene as a solvent. The evaporation rate, viscosity and surface tension of the ink were carefully optimized by tuning the volume ratio of these two solvents for forming appropriate Marangoni flow, so as to balance the capillary flow and eliminate the coffee ring effect further. Successfully, CsPbBr3 perovskite microarrays with uniform surface, low roughness and no coffee rings were achieved by inkjet printing the optimized perovskite QD ink on a PVK (poly-(9-vinylcarbazole)) layer. Furthermore, we patterned the CsPbBr3 perovskite QD ink, and the printed patterns were only visible under ultraviolet (UV) light, which can be applied in invisible anti-counterfeiting labels and encryption in the future.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 11
·1331
·
IF 4.146
Siwei Zhao,Shaohua Jin,Huanmin Liu,Shengfu Li,Kun Chen
Due to their high absorption coefficient and long carrier lifetime, halide perovskites are promising candidates for photocatalysts. For this study, the antisolvent crystallization protocol and the colloidal crystal templating approach were combined to fabricate the highly crystalline cesium lead bromide perovskite with inverse opal morphology (IO-CsPbBr3). Scanning electron microscopy and transmission electron microscope images demonstrate the three-dimensional well-ordered porous structures of the IO-CsPbBr3and their single-crystalline features. The presented approach not only provides hierarchical porous structures but also enhances overall crystallinity. When used as catalysts to promote the polymerization of 2,2′,5′,2″-ter-3,4-ethylenedioxythiophene, the highly crystalline IO-CsPbBr3exhibits a superior photocatalytic performance compared to its polycrystalline counterpart. Furthermore, the morphology and the crystalline structure of the highly crystalline IO-CsPbBr3are well preserved under photocatalytic conditions. This novel approach enables the preparation of a halide perovskite inverse opal with high crystallinity.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yuan-Yuan Cui,Hu-Bo Ren,Cheng-Xiong Yang,Xiu-Ping Yan
Development of energy-saving and rapid strategies to synthesize novel porous materials for efficient adsorption and removal of environmental pollutants is of great challenge and interest either in environmental science or in chemistry. Here we report a facile room temperature stirring method for rapid synthesis of microporous organic networks (MONs) with large surface area, excellent hydrophobicity, good thermal and solvent stabilities for efficient adsorption and removal of a typical brominated flame retardant tetrabromobisphenol A (TBBPA) from aqueous solution. The adsorption kinetics, isotherms and thermodynamics, effects of pH, ionic strength, humic acid, regeneration and reusability of MONs for TBBPA were studied in detail. The adsorption of TBBPA on MONs followed the pseudo-second-order kinetic and Langmuir adsorption models. Rely on the good π-π and hydrophobic interaction between MONs and TBBPA, a maximum adsorption capacity of 227.3 mg g −1 was realized, which is the largest adsorption capacity for TBBPA among all the reported sorbents up to date now. The large adsorption capacity, rapid adsorption kinetics, good stability and reusability make MONs a highly potential adsorbent for TBBPA removal from aqueous solution. This work may also promote the synthesis and application of MONs in pollutants’ removal.
研究领域:
环境化学
·
材料科学
·
污染控制
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吸附科学
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Sai-Li Zheng,Yonghe He,Xiao-Kang Qiu,Yuan-Hui Zhong,Lai-Hon Chung,Wei-Ming Liao,Jun He
A novel metal-organic framework [CuCN(TMBP)·H 2 O] n ( TCuCN ) has been synthesized by the reaction of 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (TMBP) and CuCN. Its structure was determined by single-crystal X-ray diffraction (SCXRD) analysis and further characterized by power X-ray diffraction (PXRD) analysis, FT-IR spectroscopy and thermogravimetric (TG) analysis. Previously reported structurally analogous TCuCl , TCuBr , TCuI have also been synthesized for Br 2 adsorption comparison. All of these four MOFs exhibited reversible uptake of Br 2 vapor judging by the unchanged PXRD patterns . Among four MOFs, Br 2 -loaded TCuI showed the most uptake amount of Br 2 (15.7 wt%), providing the formula to be TCuI ·0.33Br 2 . The different uptake amount of Br 2 for TCuX (X = CN, Cl, Br, I) should be mainly ascribed to the intermolecular interaction between CuX and Br 2 .
研究领域:
无机化学
·
材料化学
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配位化学
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多孔材料
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气体吸附
✓ 已验证
DOI
高影响因子
Chinese Physics C
·
2023
·Vol. 47
·期 3
·034001
·
IF 3.6
Long He,Junhua Luo,Li Jiang
Measurement of the cross-sections of the 79Br(n, 2n)78Br, 81Br(n, p)81mSe, 81Br(n, α)78As, and 79Br(n, α)76As reactions was performed at specific neutron energies, precisely, 13.5±0.2, 14.1±0.2, 14.4±0.2, and 14.8±0.2 MeV, relative to the standard 93Nb(n, 2n)92mNb and 27Al(n, α)24Na reference reactions using offline γ-ray spectrometry and neutron activation. Monoenergetic neutrons were generated at the China Academy of Engineering Physics via a 3H(d, n)4He reaction using the K-400 Neutron Generator equipped with a solid 3H-Ti based target. The activity of the reaction produce was obtained using a high-purity germanium detector. The cross-sections of the (n, 2n), (n, p), and (n, α) reactions on the bromine isotopes were measured in the 13–15 MeV neutron energy range. The covariance analysis approach was employed for a thorough inspection of any uncertainties within the measured cross-section data. A discussion and comparison of the observed outcome were carried out with previously published data, especially with the results of the JENDL-4.0, JEFF-3.3, TENDL-2019, and ENDF/B-VIII.0 data libraries, along with the theoretical excitation function curve derived by employing the TALYS-1.95 program. Improved cross-section restrictions for the investigated processes in the 13–15 MeV neutron energy range will be obtained using the current findings, which will help to raise the caliber of associated databases. Furthermore, the parameters of relevant nuclear reaction models can be verified using this data.
研究领域:
核物理学
·
核工程
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 7
·2301966
·
IF 9
Congcong Chen,Luming Zhang,Xiaoqing Ji,Xuanyu Zhang,Yaping Gong,Rui Chen,Lingling Mao
Hybrid lead halide perovskites have generated increasing attention for their high performance in optoelectronic applications. One main drawback of these materials is the sensitivity to moisture, which contributes heavily to the ultimate decomposition. Here, this study takes advantage of the reported representative white-light emitting lead bromide perovskite and three-dimensional (3D) perovskite as the subject of water-stability study. It is reported here that other than observed phase transformation in one case, the majority of these perovskites break down in water rapidly, precipitating out as an inorganic salt compound Pb 3 Br 6 [H 2 O]·H 2 O. As these materials are studied in detail, it is discovered that better coverage of the hydrophobic organic cation enhances the water stability. Taking this idea further, it is demonstrated here that five new one-dimensional (1D) lead bromide compounds have superior water stability, where the longest stability when completely immersed in water is more than one year and counting. This work provides a new mechanism regarding the degradation process when encountering moisture and general guidelines to increase the water stability for the lead bromide hybrids.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yusheng Song,Xi Yuan,Ke Xing,Sheng Cao,Jinju Zheng,Bingsuo Zou,Jialong Zhao
Improving the photoluminescence quantum yields (PL QYs) and stability of blue-emitting CsPbBr 3 nanoplatelets (NPLs) is essential for the application in high-quality displays. Herein, highly luminescent CsPbBr 3 NPLs with PL peak at 462 nm were prepared by a modified supersaturated recrystallization synthesis strategy at room temperature. The resulting blue CsPbBr 3 NPLs show high PL QY of 98% and a full width at half maximum of 13 nm, benefiting from the decyl disulfide (DF) surface treatment. Besides, the DF-treated CsPbBr 3 NPLs show lower Urbach energy (15 meV) and more outstanding water, acetone, and UV-light resistance stabilities than the pristine ones, suggesting that the surface ligand treatment can reduce Br − vacancy defects and inhibit the non-radiative recombination process. Based on the temperature-dependent PL, the exciton binding energy of CsPbBr 3 NPLs is found to increase from 109 to 201 meV after DF treatment. Finally, light-emitting diodes based on the treated CsPbBr 3 NPLs were fabricated.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 47
·26086-26104
·
IF 11.9
Lijun Chen,Feihong Wang,Jiahao Zhang,Hongyuan Wei,Leping Dang
This work presents a referential case in which the original efficient band structure of a binary composite remains intact when a third component is introduced. The spherical BiOBr (BOB) possesses good stability and a low valence band position, but its poor separation efficiency of photogenerated charge carriers limits its application. This limitation can be overcome by combining it with two-dimensional g-C3N4 nanosheets (CNs) in an appropriate proportion. The soft and lightweight texture of CNs ensures effective wrapping of BOB to form a tight integration. However, the limited visible light absorption of CNs/BOB hampers the overall catalytic effect. Black phosphorus nanosheets (BPs) exhibit outstanding light absorption over a wide range, and their incorporation into CNs/BOB can compensate for this deficiency. Additionally, new migration pathways can be formed to further enhance the spatial separation of photogenerated charge carriers. Furthermore, scavenging experiments and EPR tests confirmed that the presence of BPs did not alter the original S-scheme band structure between CNs and BOB, owing to proper band alignment and the effect of an internal electric field, allowing the useful photogenerated electrons and holes with strong redox ability to continue playing a pivotal role. As a result, 88.3% of tetracycline hydrochloride (TCH, 200 mL, 20 mg L−1) can be removed under visible light in 60 minutes using 50 mg of 6BPs/CNs/BOB1:2, with good reusability and adaptability to various pollutants. This work provides a valuable strategy for designing and preparing ternary composites with attractive photocatalytic performance driven by visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Shuanshi Fan,Hong Huang,Chi Yu,Yanhong Wang,Xuemei Lang,Shenglong Wang,Gang Li,Wangyang Yu
The product gas of natural gas hydrate production by CO2 replacement is the lean-CH4/CO2 binary gas which contains 85–95% CO2. In this work, the lean-CH4/CO2 (10 mol % CH4/90 mol % CO2) binary mixture was used to simulate the product gas of natural gas hydrate production via CO2 replacement, and a promising and mild (low pressure) hydrate-based gas separation (HBGS) technology was employed. This work innovatively proposes to inject the reaction liquid to maintain the constant pressure of the whole process, which makes hydrates form continuously to increase the gas consumption. First, the hydrate phase equilibrium of 10 mol % CH4/90 mol % CO2 + 5 wt % tetrabutylammonium bromide (TBAB, aq) was measured in the range of 280–287 K and 0.5–4 MPa. After that, hydrate-based mild separation of the lean-CH4/CO2 binary gas was conducted with the help of TBAB at a constant pressure in the range of 1–4 MPa. The results show that after HBGS in addition with 5 wt % TBAB(aq) at 1 MPa and 278 K, the CH4 concentration could be increased from 17.2 to 66.2 mol % under constant pressure operation, while it was just slightly increased to 17.2 mol % under nonconstant pressure operation. HBGS with 5 wt % TBAB under constant pressure had the best separation performance. Subcooling has a greater effect on the separation kinetics. HBGS of 10 mol % CH4/90 mol % CO2 under a constant pressure operation of 2 MPa, subcooling of 6 K, and 5 wt % TBAB has the highest separation factor above 37. It is suggested that hydrate-based lean-CH4/CO2 separation experiments are carried out at a mild pressure with low G/L and, more importantly, in a short time. This work proposed a mild HBGS of lean-CH4/CO2 separation, which could benefit the separation of gas produced by natural gas hydrate replacement exploitation. This work also simultaneously provides insights into other HBGS for other gas mixtures (flue gas, coalbed methane, biogas, and shift gas) to achieve low energy consumption, high gas consumption, and high efficiency.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）