SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Xiang-yu Kong,Ling-Jie Hou,Xiu-qing Shao,Shao-Min Shuang,Yu Wang,Chuan Dong
A novel fluorescent probe , phenolphthalein‑dialdehyde‑(2‑pyridyl) hydrazone (L), for sequentially detecting Al 3+ and F − in almost 100% aqueous medium was successfully designed and synthesized. The probe offers two binding pockets for Al 3+ to form a 1: 2 ligand/metal complex, leading to a significant fluorescence enhancement at 465 nm. Further, the in-situ formed L-Al complex acts as a secondary fluorescent chemosensor for F − by quenching the fluorescence of the complex with high selectivity. The detection limit for Al 3+ and F − sensing is 2.28 nM and 0.13 μM, respectively, which are far below the World Health Organization (WHO) acceptable limits (7.41 μM for Al 3+ ion and 79 μM for F − ) in drinking water . The probe L was successfully applied to the detection of Al 3+ and F − in cells using fluorescence microscopy .
研究领域:
分析化学
·
生物医学
✓ 已验证
DOI
PubMed
高影响因子
Environmental Science-Processes & Impacts
·
2024
·
IF 4.3
Chang Xu,Bo Gong,Shan Zhao,Xiao-Min Sun,Shu-Guang Wang,Chao Song
Tetracycline (TC) and Cu(II) coexist commonly in various waters, which may infiltrate into the subterranean environment through runoff and leaching, resulting in substantial ecological risks. However, the underlying mechanisms why Cu(II) affects the transport of TC in porous media remain to be further explored and supported by more evidence, especially the role of complexation. In this study, the transport of TC with coexisting Cu(II) was comprehensively explored with column experiments and density functional theory (DFT) calculation. At natural environmental concentrations, Cu(II) significantly inhibited the transport of TC in the quartz sand column. Cu(II) augmented the retention of TC in the column mainly via electrostatic force and complexation. The interaction between TC and TC–Cu complexes on the surface of SiO2 was investigated with first-principles calculations for the first time. There were strong van der Waals forces and coordination bonds on the surface of complexes and SiO2, leading to higher adsorption energy than that of TC and inhibiting its penetration. This study offers novel insights and theoretical framework for the transport of antibiotics in the presence of metal ions to better understand the fate of antibiotics in nature.
研究领域:
环境科学
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Hui Guo,Shaoshuang Zhu,Zhenghan Zhang,Lu Pan,Huimin Jiang,Nasir A. Siddiqui,Aslam Khan,Jianjian Lin
Constructing non-precious metal electrocatalysts with good hydrogen evolution activity is crucial for the hydrogen evolution reaction (HER) in acidic media. The synergistic optimization of the water dissociation and hydrogen desorption steps presents a challenge for the HER. Here, we have synthesized phosphorus-doped tungsten trioxide with oxygen vacancies (P-WO3-x) using a simple but effective hydrothermal reaction followed by calcination annealing. Interestingly, the P-WO3-x material exhibits unique characteristics that set it apart from conventional tungsten oxide-based electrocatalysts. The introduction of oxygen vacancies and phosphorus doping creates an optimal structure that significantly improves the electronic properties and the catalytic sites. The oxygen vacancies enhance the material’s ability to adsorb and activate water molecules, while phosphorus doping further modifies the electronic structure, facilitating more efficient hydrogen desorption. Meanwhile, the catalyst demonstrates a favorable urchin-like morphology with excellent supportability. Remarkably, the P-WO3-x electrocatalyst demonstrates excellent HER performance and excellent durability. We indicate that P-WO3-x exhibits a small overpotential (155.42 mV at -10 mA cm-2), a low Tafel slope (74.97 mV dec-1), and excellent durability over 12 hours. This work presents a significant advance for the development of tungsten oxide-based electrocatalysts with anion doping and oxygen vacancies for HER in acidic media.
研究领域:
材料科学
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电催化
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Peng Wan,Xiaobin Gu,Xiaolong Ouyang,Shuyu Shi,Baolin Deng,Jiaqi Liu,Paul K. Chu,Xue-Feng Yu
Water evaporation driven by solar energy is an efficient, renewable, and environmentally friendly method to purify polluted or saline water. However, current solar-powered evaporation systems generally suffer from the poor stability, high materials cost, and complex fabrication processes. In this work, an inexpensive and versatile photothermal membrane (PTM) is prepared with basalt-fibers, which are prepared from natural basalt and synthesized by fiber forming and annealing. Owing to the special chemical composition and physical structure, the basalt-fiber PTM is very robust and corrosion resistant in extreme environments such as a strong acid, organic solvent, and alkali. The water evaporation processes are investigated and the floating-with-insulator mode shows the lowest heat dissipation and highest water evaporation rate. The basalt-fiber fabric is optimized by carbonization and a vaporization rate of 1.50 kg·m −2 ·h −1 and energy utilization efficiency of 82.5% are achieved for evaporation of pure water. The basalt-fiber PTM can be hand washed at least 30 times without efficiency deterioration and the process can be readily scaled up to address commercial needs.
研究领域:
材料科学
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环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Bing Liu,Ke Sha,Meng Fei Zhou,Kai Xin Song,Yu Hui Huang,Cheng Chao Hu
Two novel low- ε r gallates MGa 2 O 4 (M = Ca, Sr) have been synthesized via a standard solid-state reaction method. According to the X-ray diffraction results, CaGa 2 O 4 crystallizes in space group Pna2 1 with an orthorhombic symmetry, while SrGa 2 O 4 belongs to the monoclinic P2 1 / c system. Both ceramics show ever-improving microstructures with the increasing sintering temperature . The optimal microwave dielectric properties ( ε r = 9.2, Qf = 66,000 GHz, τ f =–85 ppm/°C for SrGa 2 O 4 and ε r = 10.6, Qf = 15,400 GHz, τ f =–58 ppm/°C for CaGa 2 O 4 ) are obtained when sintered at 1275 °C. A patch antenna is fabricated using SrGa 2 O 4 ceramics as the substrate, which realizes a return loss of –19.94 dB and total efficiency of –1.38 dB (72.8 % in power ratio) at 4.84 GHz. The exceptional performances indicate that SrGa 2 O 4 ceramics are promising candidates for antenna applications at the Sub-6 GHz band.
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
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Jin Xiaoting,Yu Xiangyang,Zhu Guangyan,Zheng Zuntao,Feng Fayun,Zhang Zhiyong
A high capacity of laccase from Trametes versicolor capable of degrading pesticides has been revealed. The conditions for degrading of five selected pesticides including chlorpyrifos, chlorothalonil, pyrimethanil, atrazine and isoproturon with the purified laccases from Trametes versicolor were optimized. The results showed that the optimum conditions for the highest activity were pH at 5.0 and temperature at 25 °C. The best mediators were violuric acid for pyrimethanil and isoproturon, vanillin for chlorpyrifos, and acetosyringone and HBT for chlorothalonil and atrazine, respectively. The laccase was found to be stable at a pH range from 5.0 to 7.0 and temperature from 25 to 30 °C. It was observed that each pesticide required a different laccase mediator concentration typically between 4.0–6.0 mmol/L. In the experiment, the degradation rates of pyrimethanil and isoproturon were significantly faster than those of chlorpyrifos, chlorothalonil and atrazine. For example, it was observed that pyrimethanil and isoproturon degraded up to nearly 100% after 24 hours while the other three pesticides just reached up 90% of degradation after 8 days of incubation.
研究领域:
环境生物学
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 22
·10992-11000
·
IF 6.97
Junmei Liang,Chaoying Ding,Jiapeng Liu,Tao Chen,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
The hydrogen evolution reaction (HER) in alkaline media is key for the cathodic reaction of electrochemical water splitting, but it suffers sluggish kinetics due to the slow water dissociation process. Here, we present a simple strategy to enhance the HER activity in alkaline media by engineering Co-doped MoS2 coupled with Mo2CTx MXene. The improved HER activity might be ascribed to the synergistic regulation of water dissociation sites and electronic conductivity. Co doping could effectively regulate the electronic structure of MoS2 and further improve the intrinsic activity of the catalyst. Mo2CTx MXene served as both the active and conductive substrate to facilitate electron transfer. As a result, the Co-MoS2/Mo2CTx nanohybrids showed dramatically enhanced HER performance with a low overpotential of 112 mV at a current density of 10 mA cm−2 and exhibited excellent long-term stability in alkaline media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 29
·16701-16712
·
IF 3.049
Xiaofeng Li,Maohua Ma,Xuan Xin,Yuqian Tang,Guanglei Zhao,Xinglong Xiao
Gastrodin, a bioactive compound extracted from the plant source of Gastrodia elata Blume, has a wide range of therapeutic effects on central nervous system (CNS) diseases, but suffers from poor brain permeability and short half-life in plasma. In this study, fatty acid esters of gastrodin were successfully synthesized by a whole cell-based biocatalytic method. Aspergillus oryzae cells showed different catalytic activities in the organic solvent systems tested. Tetrahydrofuran was confirmed as the most suitable pure organic solvent, with the highest substrate conversion of 98.0%. Addition of ionic liquids (ILs) into pyridine dramatically accelerated the reaction with conversion increased from 5.9% to 84.2%, and also changed the selectivity of the cells, mainly due to the use of IL-containing systems altering cell permeability and contact of the enzymes with solvent molecules possessing different polarities. The ester products were characterized by 13C-NMR and ESI-MS as gastrodin monoester and diester.
研究领域:
药理学
·
生物催化
·
神经科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2019
·Vol. 20
·期 2
·911-920
·
IF 2.669
Zhang Mo,Li Duo,Ye Zhi,Wang Shiqi,Xu Nan,Wang Fang,Liu Shouqing,Chen Jianping,Gu Huajie
Purpose Nano silicon particles (nSiO 2 ) is one of the most widely used industrial engineered nanomaterials (ENMs). The extensive applications of nSiO 2 may pose potential risks to aquatic ecosystems and human health. Humic acid (HA) is a major component of soil and water that exists widely in the natural environment and adsorbs to the surface of nanoparticles, which affects the fate and transport of ENMs in soil. Therefore, it triggers the necessity to study the chemical reaction of HA controlling the sedimentation and transport of nSiO 2 . Materials and methods The sedimentation kinetics and transport breakthrough curves of nSiO 2 with/without HA in water-saturated porous media were studied in two electrolyte (NaCl and CaCl 2 ) solutions. The likely mechanisms were explored with both multiple technologies and numerical modeling including TEM-EDX, particle size distribution, zeta potentials, and the two-site kinetic attachment model (TSKAM). Results and discussion Our experimental results showed that the existence of HA generally increased the suspensivity and the transportability of nSiO 2 in NaCl and CaCl 2 solutions in packed sand columns at acidic pH. This result was attributed to the HA adsorption leading to the more negatively charged surface and the smaller size of nSiO 2 aggregates. However, the formation of coordination complexes associated with larger cluster among nSiO 2 between HA and Ca 2+ contributed to the increased sedimentation of nSiO 2 at alkaline pH. Subsequently, the presence of HA inhibited the transport of nSiO 2 in CaCl 2 solution at pH 9.0. Comparably, in NaCl at pH 9.0, HA showed the negligible effect on the nSiO 2 deposition in sand. Both the attachment and detachment parameters, which were obtained from fitting the breakthrough curves of ENMs using the TSKAM, could be used to well describe the transport behavior of nSiO 2 with HA under various conditions. In particular, the irreversible attachment parameters at site 2 on sand were positively related to the retention of nSiO 2 with HA. Conclusions The fate and transport of nSiO 2 can be distinctly affected by HA depending on the ion composition, ion strength, and pH in soil. This study will provide insights for assessing the mobility of nSiO 2 with HA in subsurface soil and aquatic environments.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 3
·411
·
IF 3.164
Liujun Pei,Yuni Luo,Xiaomin Gu,Huashu Dou,Jiping Wang
The main goal of this article is to study the diffusion mechanism of aqueous solutions and the swelling of cellulosic fibers in the silicone non-aqueous dyeing system via fluorescent labeling. Due to non-polar media only adsorbing on the surface of fiber, cellulosic fiber could not swell as a result of the non-polar media. However, because water molecules can diffuse into the non-crystalline region of the fiber, cellulosic fiber could swell by water which was dispersed or emulsified in a non-aqueous dyeing system. To study the diffusion mechanism of an aqueous solution in the siloxane non-aqueous dyeing system, siloxane non-aqueous media was first diffused to the cellulosic fiber because of its lower surface tension. The resulting aqueous solution took more time to diffuse the surface of the cellulosic fiber, because water molecules must penetrate the siloxane non-aqueous media film. Compared with the fluorescent intensity of the fiber surface, the siloxane film could be re-transferred to the dye bath under the emulsification of the surfactant and the mechanical force. Therefore, a longer diffusion time of the aqueous solution ensured the dyeing feasibility for cellulosic fiber in the non-aqueous dyeing system.Keywords:non-aqueous medium;cellulosic fiber;siloxane;diffusion;swelling
研究领域:
纺织科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2013
·
IF 2.266
Ting Wen,Fei Qu,Nian Bing Li,Hong Qun Luo
In this work, we developed a facile, sensitive, and rapid spectrophotometric method for copper(II) ion detection in aqueous media using polyethyleneimine. Polyethyleneimine is a cationic polymer that has no absorption in the wavelength range of 250–800 nm. When trace amounts of copper(II) ion was added to the colorless polyethyleneimine solution, copper(II) ion could react with the amino groups of the polyethyleneimine to form a dark blue cuprammonium complex whose absorption spectrum exhibited two absorption peaks at 275 and 630 nm, respectively. The effects of parameters such as polyethyleneimine concentration, pH, temperature, reaction time, and the most suitable medium for the reaction were investigated. A linear relationship ( R 2 = 0.9997) between absorbance and the concentration of copper(II) ion was found at the maximum absorption peak of 275 nm in the concentration range of 2–400 μM. The detection limit for copper(II) ion was 566 nM. The response of polyethyleneimine toward different metal ions was investigated, and polyethyleneimine displayed a high selectivity for the copper(II) ion among the metal ions examined. This biocompatible and sensitive sensor may find applications in copper(II) ion detection in environmental and biological processes.
研究领域:
分析化学
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Shuai Liu,Anning Jiang,Zegao Wang,Mengxia Lin,Dan Xia,Qiang Li,Mingdong Dong
Exploiting high-efficient and stable non-precious metal-based electrocatalysts toward hydrogen evolution reaction (HER) is of enormous significance to address the shortage of global power source, but there remain major challenges. Here we present a facile and controllable strategy to synthesize a strongly coupled ultrasmall-cobalt phosphide/nitrogen-doped graphitic carbon (u-CoP@NC) hybrid structure via phosphorization from a porous coordination polymer (PCP) precursor. The PCP-derived u-CoP@NC exhibits remarkable activity and stability for HER, achieving a current density of 10 mA cm −2 with a low overpotential of 131 mV in acidic media and 111 mV in basic media. The corresponding Tafel slopes present in acidic and basic media are 62.7 and 70.3 mV dec −1 , respectively. Results reveal that the enhanced electrocatalytic performance of u-CoP@NC originates from the strongly coupled u-CoP nanoparticles and graphitic carbon layer, and the perfect dispersity of the active sites. This research opens up new avenues for designing earth-abundant metal-based electrocatalysts with high capability for water splitting applications.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）