Chemistry of Heterocyclic Compounds
·
2014
·Vol. 50
·期 1
·12-18
·
IF 0.698
Ge H. Y.,Fang Z. J.,Qian B. H.
3-Arylcoumarins were conveniently synthesized in excellent yields by an iron(III) chloride-promoted tandem reaction using methoxy-substituted ( E )-2,3-diphenylpropenoic acids or their methyl esters. The structure of 3-(4-methoxyphenyl)coumarin was established from X-ray crystallographic data.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
Polish Journal of Chemical Technology
·
2018
·Vol. 20
·期 4
·13-19
·
IF 0.55
Fei Song,Haoyu Xia,Puyou Jia,Meng Zhang,Lihong Hu,Yonghong Zhou
In this work, an environmentally friendly type plasticizer was introduced. The synthesis consisted of two steps. In the first step, castor oil (CO) was acrylated and then the acrylated castor oil (ACO) was epoxidized with the presence of formic acid and hydrogen peroxide in the second step. The epoxidized acrylated castor oil (EACO) was characterized by FTIR and 1H-NMR techniques. The EACO was used as a main plasticizer to obtain plasticized PVC materials and compared with DOP. The results showed that EACO improved polyvinyl-chloride (PVC) plasticization performance and reduced Tg from 81.06°C to 1.40°C. Plasticized PVC materials with EACO showed similar mechanical properties and better thermal stability than DOP. EACO had better volatility stabilities, migration and solvent extraction in PVC than DOP. EACO can be used to replace DOP to prepare soft films.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 41
·34692-34698
·
IF 3.289
Ling Wang,Qi Sun,Yang Liu,Zhisong Lu
Carbon nanotubes (CNTs) have been employed as supporting materials for the dispersion of gold nanoparticles (AuNPs) to achieve improved catalytic properties. However, the application of CNT–AuNP composites for the evaluation of chlorophenols (CPs) is not reported. Herein, gold nanoparticle/carboxyl functionalized multi-walled carbon nanotube (AuNPs@cMWCNT) nanocomposites were synthesized via an in situ reduction method and further characterized with field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-vis) spectroscopy and X-ray diffraction (XRD). The AuNPs@cMWCNT modified glassy carbon electrode was subsequently prepared as a sensor for the electrochemical detection of 4-chlorophenol (4-CP). The electro-oxidation of 4-CP on the sensor is an adsorption-controlled irreversible process, which undergoes a two-electron and two-proton transfer. Under the optimal conditions, the oxidation peak current was proportional to the 4-CP concentration in the range of 0.3 to 400 μM, with a detection limit of 0.11 μM. The experimental data demonstrate that the sensor has great reproducibility, long-term stability, high specificity and excellent feasibility. The AuNPs@cMWCNT based sensor could be a facile, low-cost and rapid tool for the potential on-line monitoring of 4-CP in practical applications.
研究领域:
分析化学
·
环境科学
·
纳米材料科学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2015
·Vol. 10
·期 3
·438-446
·
IF 1.357
Xu Minhui,Gu Xiaogang,Lu Shuguang,Miao Zhouwei,Zang Xueke,Wu Xiaoliang,Qiu Zhaofu,Sui Qian
The thermally activated persulfate (PS) degradation of carbon tetrachloride (CT) in the presence of formic acid (FA) was investigated. The results indicated that CT degradation followed a zero order kinetic model, and CO
– 2
· was responsible for the degradation of CT confirmed by radical scavenger tests. CT degradation rate increased with increasing PS or FA dosage, and the initial CT had no effect on CT degradation rate. However, the initial solution pH had effect on the degradation of CT, and the best CT degradation occurred at initial pH 6. Cl – had a negative effect on CT degradation, and high concentration of Cl – displayed much strong inhibition. Ten mmol·L –1 HCO
– 3
promoted CT degradation, while 100 mmol·L – 1NO
– 3
inhibited the degradation of CT, but SO
2– 4
promoted CT degradation in the presence of FA. The measured Cl–concentration released into solution along with CT degradation was 75.8% of the total theoretical dechlorination yield, but no chlorinated intermediates were detected. The split of C-Cl was proposed as the possible reaction pathways in CT degradation. In conclusion, this study strongly demonstrated that the thermally activated PS system in the presence of FA is a promising technique in in situ chemical oxidation (ISCO) remediation for CT contaminated site.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
NANO LETTERS
·
2018
·
IF 12.08
Meiying Leng,Ying Yang,Zhengwu Chen,Wanru Gao,Jian Zhang,Guangda Niu,Dengbing Li,Haisheng Song,Jianbing Zhang,Song Jin,Jiang Tang
Metal halide perovskite quantum dots (QDs) recently have attracted great research attentions. However, blue-emitting perovskite QDs generally suffer from low photoluminescence quantum yield (PLQY) because of easily formed defects and insufficient surface passivation. Replacement of lead with low toxicity elements is also preferred toward potential commercial applications. Here, we apply Cl-passivation to boost the PLQY of MA3Bi2Br9 QDs to 54.1% at the wavelength of 422 nm, a new PLQY record for blue emissive, lead-free perovskite QDs. Because of the incompatible crystal structures between MA3Bi2Br9 and MA3Bi2Cl9 and the careful kinetic control during the synthesis, Cl– anions are engineered to mainly locate on the surface of QDs acting as passivating ligands, which effectively suppress surface defects and enhance the PLQY. Our results highlight the potential of MA3Bi2Br9 QDs for applications of phosphors, scintillators, and light-emitting diodes.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 9
·1900454
·
IF 3.163
Xue Li,Yujie Zhang,Jingwei Shen,Shun-an Cao,Ting Li,Fei Xu
Rechargeable Mg batteries are attractive candidates for large-scale energy storage batteries with high safety due to the low-cost and non-dendritic metallic Mg anode. However, exploring high-performance cathode materials is blocking their development. Herein, a high-rate rechargeable Mg battery is established with a AgCl cathode, delivering a high reversible capacity of 70.3 mAh g −1 at 100 mA g −1 , an outstanding rate capability of 32.6 mAh g −1 at 1000 mA g −1 , and a superior long-term cyclability over 500 cycles. Further investigation of the mechanism demonstrates that a conversion reaction takes place between AgCl and metallic Ag 0 for the cathode. The solid-state Mg 2+ diffusion coefficient is as high as 8.1 × 10 −11 cm 2 s −1 , which would be the reason for the high rate capability. The current study reveals significant insights to select promising Mg-storage conversion cathodes by a combination of soft anions and soft transition-metal cations.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yisheng Zhang,Qian Li,Huayi Li,Li Wang,Youliang Hu
Here we report a facile method to prepare nitrogen-doped porous carbon with controllable specific surface area and nitrogen content through pretreated chlorinated polypropylene with nitrogen-containing compounds(NCCs). The microstructure and porous textures of the obtained carbons are characterized by BET, SEM, TEM, XRD and Raman, respectively. SEM shows that pore structure can be found in carbon matrix. And with the increase of nitrogen content, more amorphous carbon are observed in Raman spectral. The results show that the specific surface areas are effectively increased from 1000 m 2 /g to 3269 m 2 /g when the structure of NCCs have a nitrogen-contained hexatomic ring, and nitrogen content are apparently raised from 1.3 at% to 27.73 at% when the NCCs contain guanidyl structure. Besides, XPS shows that when the nitrogen content is relatively low, nitrogen emerge at carbon matrix mainly in form of pyrrolic-N, and with the increase of nitrogen content, the pyridinic-N become the main structure of nitrogen in carbon.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Cheng Yuan,Deng-Jing Chen,Qiu-Xiang Ye,Kai Xiao,Li-Sheng Hao,Yan-Qing Nan
The CO 2 /N 2 -triggered switchable sol–gel transition based on sodium deoxycholate (NaDC) and sodium chloride (NaCl) aqueous solutions has been investigated using both experiments and molecular dynamics (MD) simulations. The effects of CO 2 on the phase behavior, viscosity, pH, electrical conductivity, and microstructure of the NaDC/NaCl mixed system were explored. The mixed system exhibits a recycled CO 2 /N 2 response, and switching between solution state and gel state with six orders of magnitude variation in shear viscosity was achieved within a narrow pH range of 7.82–7.20. The FT-IR and 1 H NMR spectra of the mixed system before and after CO 2 bubbling were measured. The experimental results indicate that NaDC is not directly protonated to deoxycholic acid by the small amount of CO 2 present; instead, an acid salt structure with a strong hydrogen bond , that is, [RCOOH⋯OOCR] − , is formed. MD simulation results reveal that, in the aqueous mixed NaDC/NaCl/CO 2 system, three types of bridging hydrogen bonds between two deoxycholate (DC − ) anions and one H 3 O + or HCO 3 − ion are key factors for the formation of hydrogels. These bridging hydrogen bonds promote the formation of DC − pairs bridged by H 3 O + or HCO 3 − ions (including the acid salt structure) and are beneficial to the growth of micelles and formation of hydrogels. It is worth noting that the bridging hydrogen bond connected by HCO 3 − ions is an aspect of CO 2 -induced hydrogels that distinguishes them from acid-induced hydrogels. In addition, the results indicate that CO 2 and NaCl have a synergistic effect when inducing hydrogel formation. Based on experiments and MD simulations, a CO 2 /N 2 -switchable sol–gel transition mechanism for an aqueous mixed NaDC/NaCl system has been proposed.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 7
·499
·
IF 3.504
Guangyang Liu,Ruonan Zhang,Lingyun Li,Xiaodong Huang,Tengfei Li,Meng Lu,Donghui Xu,Jing Wang
Monitoring of low levels of chlorsulfuron in environmental water samples is important. Although several detection methods have been developed, they all have some drawbacks, such as being time-consuming, requiring expensive instruments and experienced operators, and consuming large volumes of organic solvents. There is an urgent need for a simple, rapid, and inexpensive detection method for chlorsulfuron. Herein, such a method was developed using anti-aggregation of gold nanoparticles (AuNPs) in the presence of acetamiprid in agricultural irrigation water samples. Aggregation of the AuNPs was induced by acetamiprid, and this produced a distinct color change from Bordeaux red to blue. However, the strong hydrogen bonding interaction between chlorsulfuron and acetamiprid could inhibit AuNP aggregation. The effect of chlorsulfuron on the anti-agglomeration behavior of AuNPs was monitored by ultraviolet–visiblespectroscopy (UV-Vis) and the naked eye over a concentration range 0.1–100 mg/L. The detection limit for chlorsulfuron was 0.025 mg/L (signal-to-noise ratio of three). This colorimetric method was successfully applied to the determination of chlorsulfuron in spiked tap water and agricultural irrigation water with satisfactory recoveries (76.3%–94.2%).
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Bai-ren Yang,Zhu-qiu Sun,Li-ping Wang,Zhao-xia Li,Cheng Ding
A strain, Brevibacillus agri DH-1, isolated from dry lands was used to remove m -dichlorobenzene. After 48 h culturing, the concentrations of m -dichlorobenzene decreased from 26–130 to 7.87–28.87 mg/L and dry cell weight for bacterial growth reached 52.43–75.05 mg/L. The growth and degradation kinetics were analyzed by the fitting of Haldane-Andrews model and pseudo first-order model. A degradation pathway was proposed according to major intermediates (phenol), chloride ion variation, ring-opening enzyme activity, and high mineralization (0.47 g Cl- /g m -dichlorobenzene , 0.65 g co2 /g m -dichlorobenzene , 0.15 g DCW /g m -dichlorobenzene ). In addition, the performance in a biotrickling filter (BTF) was evaluated through removal efficiency and pressure drop values with increasing inlet loading rate from 4.10 to 122.57 g/m 3 /h at three empty bed residence time points (30 s, 60 s, and 90 s). The results demonstrated that strain DH-1 possessed high removal efficiency and stable operation in a BTF.
研究领域:
环境生物学
·
微生物学
·
污染控制技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ping Lv,Ronghao Liu,Yangyang Wang,Xiaoxia Liu,Yang Wu,Wenfeng Xue,Yanzhao Yang
In this study, a novel gemini-type benzimidazole ionic liquid [C 6 BIM 2 ][NTf 2 ] 2 was synthesized for efficient extract gold(III) from hydrochloric acid medium. Firstly, a series of parameters (e.g., vibrating time, the extractant concentration, acidity and salinity) were optimized and obtained the optimal extraction condition. Under this condition, the extraction efficiency can reach 98.42%, along with the distribution ratio of 186.87. Through the response surface methodology (RSM) model optimization, the amount of [C 6 BIM 2 ][NTf 2 ] 2 corresponding to different HCl concentration was determined for gold(III) extraction during actual operation. Then, verified the anion exchange mechanism with the aid of Job’s method, UV–vis, FT-IR and 13 C NMR. Thermodynamic parameters were calculated and implied that the extraction reaction was an exothermic and spontaneous process. Furthermore, organic phase loaded with gold(III) was easy to be completely stripped by CS(NH 2 ) 2 / HCl solution and its extraction ability was kept constant after 5 cycles extraction experiments. Meanwhile, [C 6 BIM 2 ][NTf 2 ] 2 has a superb ability to select gold(III) in the multi-metal solution. In general, [C 6 BIM 2 ][NTf 2 ] 2 showed distinguished selectivity and extraction ability for gold(III) from secondary resources, which was claimed to be a promising new style extractant.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 1
·110-115
·
IF 3.879
Zhenglin Zhang,Haiyan Song,Shishu Zhang,Junyan Zhang,Wenya Bao,Quanqin Zhao,Xiang Wu
Epichlorohydrin (ECH) is mainly an industrial raw material, while it is toxic and dangerous for human health, so finding a simple and effective method for detecting ECH gas is challenging work. Porous SnO2 structures are successfully obtained through a hydrothermal method using SnCl4·5H2O as the tin source and water as the solvent. Ag nanoparticle (NPs) decorated porous SnO2 structures have also been prepared by the impregnation method. The morphology and structure of the as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and the nitrogen adsorption–desorption technique. The as-synthesized nanostructures, with diameters ranging from 4–5 μm, are composed of porous nanosheets with an average thickness of 60 nm. The gas sensing properties of the Ag NPs decorated porous SnO2 structures for ECH gas were investigated in detail, and the results showed that the 10% Ag NPs decorated porous SnO2 structures gas sensor was the optimum sensor, demonstrating a response (S = 50) for 100 ppm of ECH gas, while the working temperature was decreased by about 180 °C. In addition, it showed a low detection level (0.5 ppm) for ECH gas, good reproducibility and repeatability, and long-term stability, implying a promising application in detecting ECH gas.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）