Scientific Reports
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2018
·Vol. 8
·期 1
·1-9
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IF 4.122
Zhu Yun,Hu Xueping,Pan Dawei,Han Haitao,Lin Mingyue,Lu Yan,Wang Chenchen,Zhu Rilong
In this study, the speciation of iron (Fe), including total Fe (TFe) and acidified dissolved Fe (ADFe), was assessed by fast cathodic absorption stripping voltammetry, using a gold electrode and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) as a novel complexing agent for Fe. The validity and accuracy of this method were compared with the standard spectrophotometry and tested by the standard samples. Under optimized conditions, the Fe response was linear within the range of 0.01 to 1 μM with a detection limit of 1.2 nM. To further validate this method, the variation in concentrations of TFe and ADFe were investigated at twelve sampling stations in a local coastal river, in both the dry and wet season. Additionally, to further understand the interaction between Fe and environmental factors, the relationships between the concentration of Fe species and dissolved oxygen (DO) and salinity were also discussed.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Jun Wang,Changqing Yang,Mingli Fu,Daiqi Ye,Lan Fan,Yun Hu
Different Br-doped metal-organic frameworks (MOFs) derived (Br x @UiO-66) have been prepared by heat treatment using UiO-66 as the precursor. The experimental results showed that Br 0.2 @UiO-66 exhibited the best photocatalytic oxidation and adsorption performances toward acetaldehyde. In the dynamic system, the acetaldehyde removal rate and adsorption capacity of Br 0.2 @UiO-66 were 93.2 % and 230.59 mg/g, respectively. The improvement of the photocatalytic performance can be attributed to the presence of Br ions and C Br bonds, which facilitated the rapid separation of electrons and holes and the production of •O 2 − . In addition, Br 0.2 @UiO-66 had a better adsorption performance than 300UiO-66, mainly because of the increased Lewis acidity of the metal active sites due to Br doping. Radical capture experiments indicated that •O 2 − and e - were the primary active substances in acetaldehyde oxidation , and allowed establishing the possible mechanism of acetaldehyde oxidation. This work shows that MOFs can have high catalytic oxidation performances toward volatile organic compounds (VOCs) while retaining their adsorption capacity, and can be used for practical applications in the adsorption-catalytic integrated degradation of VOCs.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Chao Song,Ting Hu,Yan Liu,Rong Guo,Jie Han,Juqun Xi,Lei Fan
Conventional industrial conductive lubricants often contain various components to meet their functional requirements for long-term stabilization, lubrication, and conductivity. The complexity of these components makes their preparation, storage, and recycling difficult. To solve this problem, a simple three-component lamellar liquid crystals (LLCs) containing surfactant Brij30, H 2 O, and ionic liquid [C 10 mim]Br was designed and prepared. The results demonstrated that the Brij30/[C 10 mim]Br/H 2 O LLCs system has high stability, lubricity, and conductivity. In the friction test, compared with LLCs without ionic liquids, LLCs with 70 wt% [C 10 mim]Br content showed the best antiwear performance, reducing wear depth by 64.96 % and wear volume by 61.79 %. The lowest coefficient of friction was 0.0877 in the extended cycle test. The conductivity test illustrated the LLCs exhibited high electric conductivity in the [C 10 mim]Br concentration range of 40 wt% to 60 wt%. The addition of ionic liquid not only acts as a co-surfactant in the liquid crystal system to promote the assembly of the surfactant but also improves the lubrication performance and enhances the conductivity of the liquid crystal system. The generation of friction chemically reaction and physically adsorption films formed by LLCs at the friction interface has a synergistic effect on lubrication in the sliding friction process. The spherical wear particles generated by the friction process facilitate rolling friction to promote lubrication. In addition, LLCs can easily realize reusability by removing the wear debris generated by the friction process using the magneto-thermal method. These advantages make the LLCs a promising green, efficient conductive lubricant system.
研究领域:
材料科学
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化学工程
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摩擦学
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2024
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IF 2.8
Shi-Yu Ma,Jin-Kai Li,Zong-Ming Liu
In this paper, CsPbX 3 @SiO 2 (X = Cl, Br) with cubic morphology and stable optical properties have been developed. The average thickness of the SiO 2 shell is 2 ∼ 6 nm, which has the effect of protecting CsPbX 3 and isolating the external environment, passivating the surface and reducing the defect density, thus greatly improving the stability of CsPbX 3 PQDs. Based on this, the advantages of APTES as a preparation system CsPbX 3 @SiO 2 is revealed, the mechanism diagram is drawn and the stability improvement mechanism CsPbX 3 @SiO 2 is analyzed in detail, which provides a new idea for the stability improvement of CsPbX 3 perovskite quantum dots.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2021
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IF 2.475
Entian Li,Yuanyuan Zhu,Yang Xu,Yihan Zhang,Pei Yao
The sulfur compounds in gasoline will cause air pollution and acid rain. As the main component of the sulfide compounds in gasoline, dibenzothiophene (DBT) is is difficult to remove. To solve this problem, magnetic imidazole ionic liquids (MILs) with different carbon chain alkanes [C4, 6, 8min]Br/FeCl3 were developed to improve the extractive desulfurization performance. Furthermore, Cetyltrimethylammonium bromide (CTAB) was added, in combination with MILs to achieve a higher removal rate of DBT in gasoline. The results show that CTAB combined with MILs has a better removal effect on DBT. The mechanism of CTAB combined with MILs gasoline desulfurization was analyzed.
研究领域:
化学工程
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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
INORGANIC CHEMISTRY
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2016
·
IF 4.82
Qing Sun,Guanyun Zhang,Chen-Ho Tung,Yifeng Wang
Herein we report the syntheses and the X-ray structure of [Cs8X27]19- (X = Cl, Br) clusters, the first binary cluster anions isolated in bulk crystal structures. They were obtained by electrostatic capture and face-directed recognition of the prenucleation [CsmCln](n−m)– clusters from water solutions, using [M4(OH)8(OH2)16]8+ (M = ZrIV or HfIV) as the counter cations. These compounds have been thoroughly characterized with a variety of techniques including vibrational spectroscopy and superionic conductivity analysis. This work not only provides structural models for a better understanding of the nucleation of binary materials but also shows that magic number binary clusters adopting a cubic lattice structure do form, in agreement with the time-honored theoretical and spectroscopic predictions.
研究领域:
无机化学
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材料科学
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晶体学
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纳米技术
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
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2018
·Vol. 47
·期 29
·9845-9849
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IF 4.099
Daqin Chen,Xiao Chen,Junni Li,Xinyue Li,Jiasong Zhong
The preparation of CsPbX3 nanoplatelets and the investigation of their optical properties have been rarely reported. Herein, the successful development of all-inorganic CsPbX3 (X = Cl, Br, or I) perovskite quantum dots has been achieved and their unique optical and electrical properties are discussed. Apre-dissolution assisted solvothermal reaction was developed to synthesize ultrathin (∼3 nm) CsPbBr3 nanoplatelets with strong exciton absorption, with a 0.41 eV blue-shifted emission relative to that of CsPbBr3 nanocrystals and a high quantum yield of 28%. Anion exchange allowed the variation of the halogen content of the nanoplatelets and allowed them to retain their shape and size and achieve multi-color emission.
研究领域:
材料科学
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纳米技术
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光学
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化学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2020
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IF 0
Zidong Wang,Zhe Chu,Chunwei Dong,Ze Wang,Shiyu Yao,Hang Gao,Zhaoyu Liu,Yi Liu,Bai Yang,Hao Zhang
As a family of semiconductor photocatalysts, Sillén-type bismuth oxyhalides (BiOX, X = Cl, Br, I) have attracted widespread interest due to their excellent photocatalytic activity and photoconductivity. However, most current strategies on synthesizing ultrathin 2D BiOX nanosheets (NSs) rely on high temperature and pressure and complex procedures, which seriously confine their large-scale applications. Herein, we develop a simple and facile two-phase method for the synthesis of ultrathin 2D BiOX NSs with highly exposed {001} facets. On the basis of systematically studying the effects of various reaction parameters on the size, thickness, morphology, and composition of the products, the growth mechanism of ultrathin 2D BiOX NSs is presented, which indicates that the suppression of Bi3+ hydrolysis is required for the growth of 2D BiOX NSs with highly exposed {001} facets. The acidic condition prefers the growth of BiOX NSs with ultrathin structure and high crystallinity along the [001] zone axis. By using BiOBr NSs as the example, the photocatalytic activities of ultrathin 2D BiOX NSs are evaluated upon photodegradation of organic compounds and photocatalytic water oxidation. The results show that the organic compound photodegradation is mainly determined by the specific surface area of BiOBr NSs, while the O2 evolution rate of BiOBr NSs for water oxidation is dependent on their photogenerated charge separation efficiency. Because of the larger specific surface area and higher photogenerated charge separation efficiency, BiOBr-acid-0.5 ultrathin 2D NSs exhibits the fastest organic compound photodegradation rate and O2 evolution rate of 445.6 μmol g–1 h–1.
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
FOOD CHEMISTRY
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2015
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IF 3.391
Kitty S.C. Tang,Izabela Konczak,Jian Zhao
Australian native mints have traditionally been used by the aboriginal people for natural remedies; however, their bioactive components have not been studied. Antioxidant capacity and composition of phenolic compounds of Mentha australis R. Br., Lamiaceae were investigated for the first time. Phenolic compounds were analyzed by HPLC photodiode array detector, liquid chromatography high resolution mass spectrometry, tandem mass spectrometry and nuclear magnetic resonance spectroscopy. Aqueous methanolic extract of the mint exhibited comparable antioxidant capacity to the common spearmint. Major compounds identified in the extract were rosmarinic acid (160.4 ± 0.85 μg mg −1 purified extract), neoponcirin (145.0 ± 0.42 μg gallic acid equivalent (GAE) mg −1 ), narirutin (30.3 ± 0.02 μg GAE mg −1 ), chlorogenic acid (15.4 ± 0.05 μg mg −1 ) and biochanin A (9.6 ± 0.06 μg GAE mg −1 ), while minor compounds were caffeic acid, apigenin, hesperetin and naringenin. Neoponcirin and biochanin A were identified for the first time in the Mentha genus.
研究领域:
植物化学
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药用植物学
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分析化学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Tianyi Xu,Dongxu Jiao,Lei Zhang,Haiyan Zhang,Lirong Zheng,David J. Singh,Jingxiang Zhao,Weitao Zheng,Xiaoqiang Cui
Development of efficient electrocatalysts requires construction of catalytic surfaces with moderate H adsorption energy. Here, we address this challenge by Br-induced formation of P-poor defective nickel phosphide and show that the H adsorption energy can be optimized by regulating the vacancy concentration. We show that when such defective Ni 12 P 5−x Br x nanoparticles are distributed on the surface of Ni 2 P nanosheets (Ni 12 P 5−x Br x /Ni 2 P NS), excellent catalytic activity for water splitting is obtained in alkaline media. Density functional theory computations revealed that Br doping induce the formation of a P-poor nickel phosphide with vacancies, leading to an optimal H adsorption strength with a volcano-type relationship. This is the best reported for a non-precious metal phosphide at present: the overpotential for HER is 18 mV at 10 mA cm −2 and 155 mV for OER. This leads to an exceptionally low cell voltage requirement of only 1.44 V to drive overall water splitting in an alkaline electrolyzer.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2022
·
IF 5.436
Dayu Huang,Qiuyun Ouyang,Jinjiang Wu,Youchao Kong,Bo Wang,Hongzhou Lian,Jun Lin
Broadband emission with a large Stokes shift is important to obtain an excellent color rendering index of the solid-state lighting device. Among low-dimensional material and perovskite-like phosphors with broadband self-trapped emission, Sn-based phosphors have attracted much attention due to their high photoluminescence quantum yield (PLQY). However, the disadvantage is that the synthesis of Sn-based phosphors needs to be performed in a glovebox. Upon photoexcitation, the broadband emission of self-trapped excitons results from exciton–phonon coupling induced by the transient distortion of the lattice. Low-dimensional material structures often promote self-trapped emission because of more vibrational degrees of freedom and easier polarization under photoexcitation. Here, zero-dimensional (0D) SnX2 (X = Br, I) single crystals are synthesized by the solvent evaporation method in the air. SnX2 emits blue light, broadband yellow light, and deep red light, among which SnBr2 has the best luminescence performance. The photoluminescence quantum yield (PLQY) of SnBr2 reaches 85% and the Stokes shift reaches 265 nm. The PL intensity of SnX2 is linearly related to excitation power, which preliminarily indicates that the origin of SnX2 luminescence is attributed to self-trapped emission (STE). The white light-emitting diodes (WLEDs) were fabricated using yellow-emitting SnBr2 and blue-emitting BaMgAl10O17:Eu2+, which has a low correlated color temperature (3160 K) and a relatively common color rendering index (79).
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2023
·
IF 3.8
Jiayi Li,Hengtong Zhang,Hongcai Yang,Shudong Lin
Silver nanowires (AgNWs) exhibit excellent electrical conductivity and hold significant potential for usage in flexible electronics. AgNs can possess a suitable aspect ratio, uniformity, and flexibility that are essential for achieving high-performance flexible transparent conductive films. However, the synthesis of AgNWs presents a challenge in controlling its morphology, often resulting in varying lengths and aspect ratios that are difficult to regulate. Thus, the controlled preparation of AgNWs holds great significance. Herein, AgNWs were synthesized via a polyol method with FeCl 3 and KBr composite metal salt as control agents, silver nitrate as a silver source, ethylene glycol as a reducing agent and solvent, and polyvinylpyrrolidone (PVP) as a growth director. By adjusting the ratio and dosage of FeCl 3 and KBr, the morphology controllability of AgNWs was realized, and the obtained AgNWs can be straight or bendable. The surface morphology and microstructure of the AgNWs were analyzed by scanning electron microscopy (SEM). Due to the synergistic effect of FeCl 3 and KBr, flexible AgNWs with an average diameter of 25–35 nm, an average length of 35–45 um, and an aspect ratio of over 1000 can be obtained. Mechanism studies have shown that through electrostatic interactions, AgCl, AgBr, NO 3 − , and PVP in the reaction mixture can form binding sites for AgCl-PVP-NO 3 − and AgBr-PVP-NO 3 − , thus causing the silver nanowires to become flexible. Meanwhile, the strong polarization effect caused by Br − in the reaction causes the chain growth to become subject to the dual effects of electrostatic repulsion and external forces, resulting in the formation of flexible and soft silver nanowires.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
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