ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 18
·5709-5717
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IF 4.478
Yu Ying,Hu Jiaju,Zhao Xinyi,Liu Jiangchuan,Gao Ying
Photochemical vapor generation (PVG) of germanium (Ge) was first reported in this work. The synergistic effect from cobalt/chloride ions and air-liquid interfaces was found for the PVG of Ge. No obvious signal response was observed from the standard solution of Ge in 10% (v/v) formic acids (FAs) under UV irradiation. The addition of 300 mg L −1 of Co 2+ and 30 mmol L −1 of Cl − resulted in enhanced photochemical reduction for Ge, and the introduction of air-liquid interfaces proceeding and succeeding the sample solution caused another 4.6 folds of enhancement in signal response of Ge. Under the selected condition, the limit of detection (LOD, 3σ, n = 11) was obtained to be 0.008 ng mL −1 with inductively coupled plasma mass spectrometry (ICP MS) measurement. A good precision, expressed as a relative standard deviation (RSD, n = 7) of 2.0%, was found from replicated measurements of 2 ng mL −1 of Ge. The generation efficiency was found to be no better than 9 ± 2%. The PVG mechanism of Ge was investigated in this work. The new finding is useful for understanding the principle of PVG, and further exploring the analytical and environmental application of PVG. Graphical abstract
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Materials Au
·
2023
·
IF 0
Dongdong Li,Ning Zhang,Dandan Gao,Ziyu Zhuang,Dewen Zeng
Lithium aluminum layered double hydroxide chlorides (LADH-Cl) have been widely used for lithium extraction from brine. Elevation of the performances of LADH-Cl sorbents urgently requires knowledge of the composition–structure–property relationship of LADH-Cl in lithium extraction applications, but these are still unclear. Herein, combining the phase equilibrium experiments, advanced solid characterization methods, and theoretical calculations, we constructed a cyclic work diagram of LADH-Cl for lithium capture from aqueous solution, where the reversible (de)hydration and (de)intercalation induced phase evolution of LADH-Cl dominates the apparent lithium “adsorption–desorption” behavior. It is found that the real active ingredient in LADH-Cl type lithium sorbents is a dihydrated LADH-Cl with an Al:Li molar ratio varying from 2 to 3. This reversible process indicates an ultimate reversible lithium (de)intercalation capacity of ∼10 mg of Li per g of LADH-Cl. Excessive lithium deintercalation results in the phase structure collapse of dihydrated LADH-Cl to form gibbsite. When interacting with a concentrated LiCl aqueous solution, gibbsite is easily converted into lithium saturated intercalated LADH-Cl phases. By further hydration with a diluted LiCl aqueous solution, this phase again converts to the active dihydrated LADH-Cl. In the whole cyclic progress, lithium ions thermodynamically favor staying in the Al–OH octahedral cavities, but the (de)intercalation of lithium has kinetic factors deriving from the variation of the Al–OH hydroxyl orientation. The present results provide fundamental knowledge for the rational design and application of LADH-Cl type lithium sorbents.
研究领域:
材料化学
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环境科学
✓ 已验证
DOI
POLYMER BULLETIN
·
2017
·Vol. 75
·期 3
·1123-1139
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IF 1.43
Jiang Zhi,Wang Jingwen,Ge Renkui,Wu Chanjun
The effects of surface modification of ground calcium carbonate (GCC) particles on the thermal and mechanical properties of poly(vinyl chloride) (PVC) based composites were investigated. Aminopropyltrimethoxysilane (APS) was used as a modifier for GCC particles. The experimental results indicated that the pre-treatment of GCC particles with NaOH promoted the formation of OH − on the surface of GCC particles, which improved the graft of APS on GCC surface and enhanced the interfacial interaction between GCC particles and PVC matrix. The SEM micrographs of the PVC filled with different GCC particles showed that the dispersion of fillers in the PVC matrix was improved by surface modification. The results of TG showed that the thermal properties of PVC filled with NaOH/APS modified GCC particles (PVC/GCC–OH–APS) outweighed those of PVC filled with APS modified GCC particles (PVC/GCC–APS) or raw GCC particles (PVC/GCC). Compared with the use of raw GCC, the use of the surface modified GCC particles, especially the GCC–OH–APS, led to the increase of the tensile strength and impact strength of the composites.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 41
·19824-19833
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IF 3.925
Xiaoxia Liu,Yang Wu,Yangyang Wang,Huiying Wei,Jinxin Guo,Yanzhao Yang
Liquid–liquid extraction technology based on ionic liquids (ILs) is an efficient and environmentally friendly method to recover Au(III). This work aims to separate Au(III) from hydrochloric acid media using a novel IL [DBA-Pyr][NTf2], which is a pyrrolidinium-based IL functionalized with amide groups. Firstly, experiments have been carried out under optimal conditions, including the concentration, acidity and temperature. It turns out that low concentrations of hydrochloric acid help in Au(III) extraction, while the increase of chloride ion concentrations has an adverse effect. Then, through Job's method, extraction complexes with a molar ratio of [DBA-Pyr][NTf2]-to-Au(III) of 1 : 1 were determined. And, the anion exchange extraction mechanism was confirmed by FT-IR, UV-Vis, and 13C NMR spectroscopies and an electrostatic potential energy (ESP). Under the optimal extraction conditions, it has excellent selectivity to Au(III) compared to both base metal ions and platinum group metals (PGMs). Furthermore, Au(III) could also be recovered from the IL phase using an aqueous solution of thiourea in 95.6% with high selectivity. After 4 cycle experiments, an extraction efficiency of more than 90% is still maintained. The results show that [DBA-Pyr][NTf2] has potential application prospects in Au(III) recovery from hydrochloric acid media.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Aiqing Feng,Peilian Liu,Qiqi Liang,Xinyi Zhang,Liping Huang,Yongmei Jia,Mubiao Xie,Qing Yan,Chengpeng Li,Sheng Wang
In this work, we have developed a new carbazole-based fluorescent probe ( E )-1-methyl-4-(2-(5-(9-phenyl-9 H -carbazol-3-yl) thiophen-2-yl)vinyl)pyridin-1-ium ( PCTP ) for ratiometric and colormetric ClO − sensing. PCTP displayed red emission due to the intramolecular charge transfer (ICT) effect of phenylcarbazol moiety, while this effect can be rapidly weakened and led to the significant fluorescence change (from red to green) in the presence of ClO − . PCTP is more highly selective and sensitive towards ClO − detection than other various biological related species. The detection limit (LOD) was calculated to be 10.8 nM. More importantly, PCTP has been successfully applied in ClO − imaging in living cells and zebrafishes.
研究领域:
生物化学
·
分析化学
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细胞生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
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2021
·
IF 7.92
Xiaohui Zhang,Qingqing Gu,Yanfu Ma,Qiaoqiao Guan,Rui Jin,Hengwei Wang,Bing Yang,Junling Lu
For supported metal catalysts, the underlying support not only disperses and stabilizes metal particles, but also modulates their electronic structures remarkably, and even directly participates in catalytic reactions. Here we report that Pd nanoparticles (NPs) supported on oxygen-functionalized carbon black (Pd/O-C) show an unexpected inverse trend of selectivity on Pd particle size in chemoselective hydrogenation of para -chloronitrobenzene ( p -CNB), compared to those on carbon black (Pd/C). In situ X-ray photoemission spectroscopy reveals that the Pd NPs are more positively charged with decrease of particle size in both samples, while the Pd NPs in Pd/O-C have relatively higher fractions of positive Pd δ+ species than those in Pd/C with similar sizes. Fourier transform infrared spectroscopy shows that the balance of positive Pd δ+ species strongly modulates the competitive adsorption of -NO 2 and -Cl group in p -CNB according to their different electronegativities. As a consequence, we, for the first time, demonstrate that a moderate positive charge of Pd NPs is essential to improve the p- chloroaniline ( p -CAN) selectivity, while too high or too low positive charge could impel the adsorption of the less negatively charged -Cl group, thus generating the dehalogenated aniline by-product. These findings suggest that precise tailoring of the electronic structures of metal NPs could be essential for design of high chemoselective metal catalysts.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
ENERGY
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2020
·
IF 6.082
Ming Su,Haiping Hu,Jianchang Gan,Wenhua Ye,Wenhua Zhang,Huihu Wang
Real-time hydrogen production at low temperature can effectively solve the problem of hydrogen storage and transportation in cold area and plateau region . In this study, a novel Al alloy/NaCl/g-C 3 N 4 composite with enhanced low temperature reactivity for hydrogen production has been synthesized by mechanical ball milling method. The feasibility of Al-water reaction at the temperature of 253.15–373.15 K was firstly proved by thermodynamic calculation . The hydrogen generation performance was studied in tap water at 298.15 K and 23 wt% NaCl aqueous solution at low temperature of 253.15–273.15 K. The results indicated that the addition of g-C 3 N 4 can effectively promoted the hydrolysis of activated Al composites. Hydrogen yield of Al alloy/NaCl/g-C 3 N 4 composite with 1 g of g-C 3 N 4 addition reached 1006 mL·gAl −1 and the induction time of reaction was 90 s at 253.15 K, while that of Al alloy was only 230 mL·gAl −1 and 1120s respectively. It was supposed that the addition of g-C 3 N 4 effectively reduced the size of NaCl particles and promoted their uniform distribution in Al matrix and more cracks were generated. The kinetics and reaction mechanism using Al alloy/NaCl/g-C 3 N 4 composite were discussed. This study provides a new idea for the synthesis of Al composites with high reactivity at low temperature.
研究领域:
化学工程
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材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2010
·
IF 3.471
Zhibin Mai,Xiaojuan Zhao,Zong Dai,Xiaoyong Zou
The contribution of the chloride anion (Cl−) and guanidinium cation (Gdn+) to the denaturing efficiency of guanidine hydrochloride (GdnCl) upon the unfolding of hemoglobin (Hb) was investigated electrochemically. Hb was entrapped in a didodecyldimethylammonium bromide (DDAB)-film-modified glassy carbon electrode and unfolded by the components of GdnCl. The changes of the direct electrochemical behaviors of Hb, including peak current (Ip), formal potential (Eo′), and peak-to-peak separation (ΔE), were utilized to characterize different unfolded states of Hb. UV−vis, circular dichroism, and fluorescence spectroscopy were also used to verify the structural information of Hb during the unfolding process. The results indicated that the denaturing efficiency of GdnCl was contributed to by Gdn+ and Cl− in synchronization, and the portions of such contributions were concentration-dependent. In addition, the presence of Gdn+, Cl−, or GdnCl can enhance the reversibility of the redox reaction of Hb to the same degree. The method provides not only an easy way to better understand the conformational changes of Hb but also a strategy to control its conformation.
研究领域:
生物化学
·
分子生物学
✓ 已验证
DOI
高影响因子
Environmental Pollutants and Bioavailability
·
2022
·
IF 2.828
Bairen Yang,Jiajie Wang,Qingqing Shang,Zhuqiu Sun,Yifan Wu
The effects of rhamnolipid chelating La (III) or Nd (III) on m-dichlorobenzene removal and biofilm growth were investigated. The rhamnolipid chelating La (III) or Nd (III) significantly increased the average m-dichlorobenzene elimination capacity by 24% and 29%, respectively, on day 70–130, and the average wet weights of biomass ranged from 11 kg/m3 to 15 kg/m3 in BTFs on day 100–180 at an inlet load of at 47–98 gm3/h and an EBRT of 60s-90s. Microbial community functional genes about biofilm growth and m-dichlorobenzene removal were also increased. In addition, the rhamnolipid chelating La (III) or Nd (III) can improve the membrane permeability, extracellular polymeric substance (EPS) production, catechol 2,3 dioxygenase (C23O) enzyme, and chlorobenzene dioxygenase activity. These results demonstrate that rhamnolipid chelating La (III) or Nd (III) have the potential to improve the performance of BTFs treating hydrophobic and highly toxic VOCs.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yingjie Mao,Zhichao Zhang,Guojun Zhou,Chen Fang,Yihan Liu,Denghui Xu,Jia Zhao,Aicong Geng,Jun Zhou
Zero-dimensional (0D) Mn(II)-based hybrids with the typical d–d transitions have been rapidly developed benefitting from the environmental friendliness, blue light excitation and the high thermal stability. Herein, we first designed two novel green-emitting 0D Mn(II)-based hybrids (C 16 H 28 N) 2 MnCl 4 and (C 21 H 46 N) 2 MnCl 4 , where the organic cations cocrystallize with four-coordinated [MnCl 4 ] 2- tetrahedrons. Upon blue-light excitation, these two crystals exhibited narrow-band green emission with distinct emission intensity and FWHM as well as thermal quenching behavior, which is analyzed by the influence of the crystal structure of different organic cations on the luminescence performance. Furthermore, multiple emission color can be observed from green to orange-red in (C 16 H 28 N) 2 MnCl 4 :Sb 3+ by regulating the [SbCl 5 ] 2- /[MnCl 4 ] 2- molar ratio or excitation wavelength. Our study not only enriches the influence of organic cations on crystal structure and luminescence performance, but also provides a new direction towards realizing the multi-color emission by Sb 3+ ions doping strategy.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Peiran Xie,Pan Wang,Jiaqian Zhou,Zhu Guo,Lingling Mao
0D organic–inorganic antimony halides have attracted increasing attention due to the non-toxicity, high stability, and superior photoluminescence quantum yield (PLQY). Here, a series of hybrid antimony chlorides with the same organic cation ethyltriphenylphosphonium (Ph 3 EtP + ), including non-emissive (Ph 3 EtP) 2 Sb 2 Cl 8 and nine (Ph 3 EtP) 2 SbCl 5 -based emissive compounds, are synthesized and characterized. These emissive compounds are namely, the guest-free (Ph 3 EtP) 2 SbCl 5 and (Ph 3 EtP) 2 SbCl 5 ·guest (guest = glycol, acetic acid, methanol, ethanol, n-propanol, i-propanol, acetone, and acetonitrile). The solvent used can alter the coordination mode of Sb because the solvation effect affects the reactivity of the anions ([SbCl 4 ] − and Cl − ), leading to the formation of either A 2 Sb 2 Cl 8 or A 2 SbCl 5 . The solvents can be even incorporated into the crystal structure, where stronger interaction with [SbCl 5 ] 2− leads to higher temperature of the escape of the solvent. The guest molecules could increase the structural rigidity of [SbCl 5 ] 2− via hydrogen bonding and dipole–dipole interactions, which tends to reduce the room-temperature photoluminescence (PL) Stokes shift and temperature-dependent PL shift by decreasing the [SbCl 5 ] 2− deformability, along with enhanced PLQY from 81% in guest-free to near-unity in (Ph 3 EtP) 2 SbCl 5 ·glycol. This work shows that targeted synthesis and diversified choices of solvents provide an efficient tool to generate steady variations in hybrid emissive materials for optoelectronics.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ming Lei,Yao Tang,Huimin Wang,Lihua Zhu,Guihua Zhang,Yu Zhou,Heqing Tang
It is still very difficult to achieve rapid cleavage of C-Cl bond of highly-chlorinated benzenes by catalytic reduction process under mild conditions. By using pentachlorobenzene (PentaCB) as a representative of highly-chlorinated benzenes, we proposed a strategy to achieve rapid and complete dechlorination of highly-chlorinated benzenes by exploiting palladium with low content deposited g-C 3 N 4 (Pd/g-C 3 N 4 ) as a catalyst with NaBH 4 as a reductant. Under favorable conditions, this strategy yielded a dechlorination efficiency of 100% for PentaCB (0.4 mmol L −1 ) in methanol solution at 30 °C within 20 min, and especially the consumption of NaBH 4 is as low as 10 mmol L −1 with a molar ratio of Cl atoms to NaBH 4 of only 1:5. A hydro-dechlorination pathway was confirmed to dominate the dechlorination of PentaCB, which involves active hydrogen species (H*) as being identified by electron spin resonance (ESR) monitoring and isotope labelling experiments. The dechlorination rate constant value of chlorobenzenes (CBs) was only a little dependent on the number of chlorine atoms and the chlorine atom with smaller steric hindrance was prior to be substituted by H*. A catalytic mechanism that Pd nanoparticles played an important role on both the weakening/breaking of C-Cl bond and the formation of active hydrogen species was further clarified: Pd exerts affinity interaction on chlorine atoms at ortho -position of CBs molecules to form adsorbed state [CBs] ads ; H* was formed on the Pd surface due to its strong ability in H* retainment; subsequently the generated H* attacks the C-Cl bond in [CBs] ads to achieve hydrodechlorination. The new method provides a highly efficient method to remove halogenated pollutants.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）