RSC Advances
·
2011
·Vol. 1
·期 7
·1220-1227
·
IF 0
Chang-Dong Gu,Jiang-Ping Tu
Novel non-aqueous thermochromic solutions were facilely prepared by dissolving transition metal chlorides, such as NiCl2·6H2O, CrCl3·6H2O, FeCl3, and CoCl2·6H2O, in an inexpensive, widely available ionic liquid analogous deep eutectic solvent (DES). It was found that only the NiCl2·6H2O dissolved choline chloride-based DES exhibited a stable and significant thermochromic behavior over a wide working temperature ranging from room temperature to about 150 °C. Typically, the colour of the 0.1 M NiCl2·6H2O dissolved DES solution changed in this order from pale green (room temperature), spring green (∼70 °C), to blue (∼120 °C). An effective strategy was proposed to produce more thermochromic solutions by mixing Ni(II) with other metal ions in the choline chloride-based DES. The thermochromic PVDF composite film was demonstrated by incorporating DES-based Ni(II) solution into the microporous PVDF film. The preliminary results are expected to stimulate interest of the development of high performance thermochromic materials for the facile fabrications from DESs.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 10
·1643-1649
·
IF 1.89
Zhang Rongli,Xu Sheng,Zhu Ye,Luo Jing,Liu Xiaoya,Tang Dingxing
A simple and facile method of Ag/dopamine modified poly(γ-glutamic acid) nanoparticles (Ag/γ-PGA-DA NPs) was conveniently achieved. By simply adding AgNO 3 to the aqueous solution of γ-PGA-DA copolymer, Ag + was adsorbed in the copolymer and spontaneously reduced to Ag NPs by the dopamine moieties of γ-PGA-DA, leading to the formation of Ag/γ-PGA-DA NPs. In the reaction process, γ-PGA-DA copolymer was used as stabilizer and reductant simultaneously, avoiding the use of extra toxic reducing reagents. The resultant Ag/γ-PGA-DA NPs were used to modify electrode through simple casting method and exhibited a good analytical performance for chloride ion. The Ag/γ-PGA-DA NPs modified electrode responded linearly to chloride ion in the concentration range of 1 × 10 −8 to 1 × 10 −3 mol L −1 . Compared to other published methods for chloride ion sensing, our prepared modified electrode had much wider detection range for chloride ion sensing.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Yuhan Zhu,Xin Liu,Kai Yan,Jingdong Zhang
A visible light-activated photocathode fabricated with p-type semiconductor bismuth oxyiodide (BiOI) and graphene (G) was employed to investigate the photovoltammetric behavior of chloramphenicol (CAP). The result indicated that the voltammetric reduction peak of CAP increased to a limiting current platform under photoirradiation, owing to photoelectrocatalytic reduction of CAP on the BiOI-G photocathode. As a result, the cathodic photovoltammogram became sigmoidal in shape. Furthermore, the influences of graphene content in BiOI-G composites, scan rate and light intensity on the photovoltammetric behavior of CAP on the BiOI-G photocathode were systematically investigated. Based on such a BiOI-G electrode, a cathodic photovoltammetric sensor for CAP was proposed, which exhibited a current response linearly proportional to CAP concentration in the range of 0.5–50 μmol L −1 , with a detection limit (3S/N) of 0.14 μmol L −1 . Moreover, the photovoltammetric sensor displayed good reproducibility and high stability. The applicability of the proposed sensor was demonstrated by determining CAP in eye drop and environmental water samples.
研究领域:
分析化学
·
环境科学
·
药物分析
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 11
·4459-4473
·
IF 3.134
Wei Xinyan,Fu Xiaori,Lyu Shuguang
The use of zinc dioxide (ZnO 2 ) powder as a source of H 2 O 2 in a modified Fenton reaction catalyzed with Fe(II) to destroy trichloroethylene (TCE) was investigated. The experimental results showed that the optimum molar ratio of ZnO 2 /Fe(II)/TCE in ZnO 2 /Fe(II)/TCE system was 20/20/1 with a TCE removal of up to 99.6%. TCE degradation was significantly inhibited by the low reaction temperature and influenced by the initial solution pH, in which ZnO 2 /Fe(II)/TCE system was suited for high temperature and low pH settings. Both Cl − and HCO 3 − anions showed a detrimental effect on TCE elimination with HCO 3 − being more significant. The addition of a high concentration (100 mg/L) of HA in solution inhabited TCE degradation performance, while the effect was negligible at low concentrations (1–10 mg/L). The tests with hydroxyl radical (HO·) scavengers elucidated that TCE was mainly degraded by HO· radicals in ZnO 2 /Fe(II)/TCE system. TCE degradation and the dechlorination proceeded simultaneously, but the final release of Cl − was less than the degraded TCE, indicating the occurrence of chlorinated intermediates in the reaction process. Graphical abstract
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Kaoqi Lian,Pingping Zhang,Lingmei Niu,Siyuan Bi,Shipeng Liu,Lingling Jiang,Weijun Kang
A new method was developed for determination of ketamine (KT) in urine and plasma samples by derivatization and gas chromatography–mass spectrometry. In this article, KT was first derivatized with sodium nitrite to volatile N-nitrosamines under acidic condition. Then the derivative had been identified by the mass spectra. The derivatization conditions including the amount of hydrochloric acid, the amount of sodium nitrite, reaction temperature, reaction time and the extraction reagents were optimized. Calibration curves were linear in the range of 0.04–20 μg mL −1 for KT, and the limit of detection (LOD) and limit of quantitation (LOQ) were 0.01 μg mL −1 and 0.04 μg mL −1 , respectively. The results of recovery indicated that the method had good precision and reproducibility. Compared with existing derivatization methods, this method provided a rapid, convenient, effective and low-cost way for gas chromatography method of KT quantification.
研究领域:
分析化学
·
医学检验
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Cong Li,Feilong Dong,John C. Crittenden,Feng Luo,Xinbo Chen,Taotao Zhao
The kinetics and mechanisms of 17β-estradiol (E2) chlorination in water distribution systems (WDS) were studied. We examined the impacts of different factors, including pH, temperature, humic acid concentration and type, and flow velocity. The experimental results showed that the rate constants in beaker tests and WDS were described by a pseudo-first-order model. pH had the greatest impact on E2 chlorination in the beaker tests. However, temperature had the greatest impact on E2 chlorination in WDS. Mechanistic analysis of E2 chlorination showed that chlorine attacked E2 in three stages: 1) halogenation of the aromatic ring, 2) cleavage of the benzene moiety and chlorine or bromine substitution formation, and 3) formation of trihalomethanes (THMs) and halogenated acetic acids (HAAs) from phenolic intermediates through benzene ring opening with chlorine and/or bromine substitution of hydrogen on the carbon atoms. In the third stage, the concentrations of THMs and HAAs increased rapidly.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
PubMed
高影响因子
CARBON
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2018
·
IF 7.082
Kaikai Zhang,Peng Sun,Marie Christine A.S. Faye,Yanrong Zhang
The property of biochar and its potential application toward chlorobenzene degradation were investigated in this study. The biochar was derived from rice husk and charred at 550 °C in N 2 atmosphere, which showed a significant degradation of chlorobenzene in ambient atmosphere. The results from Scanning Electron Microscope , X-Ray Diffraction and Raman Spectroscopy indicated the formation of poorly ordered graphene stacks embedded in amorphous phases on biochar. Fourier Transform Infrared Spectroscopy and Electron Paramagnetic Resonance suggested the existence of hydroquinone-quinone moieties on biochar, which could induce the generation of reactive oxygen species and promote the degradation of chlorobenzene. Furthermore, hydrogen peroxide and hydroxyl radicals were generated from the reduction of oxygen with the oxidization of phenolic hydroxyl groups on biochar, which was responsible for chlorobenzene degradation. In addition, more types of intermediate products of chlorobenzene degradation were detected in biochar system compared with conventional Fenton reaction, which could be possibly ascribed to the interfacial reaction between chlorobenzene and reactive oxygen species on biochar surface. The findings in this study would provide a new insight into the application of biochar in organic pollutant removal .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 23
·19031-19043
·
IF 2.741
Mubeen Ishrat,Buekens Alfons,Chen Zhiliang,Lu Shengyong,Yan Jianhua
Municipal solid waste incineration (MSWI) fly ash has been classified as hazardous waste and needs treatment in an environmentally safe manner. Mechanochemical (MC) treatment is such a detoxification method, since it destroys dioxins and solidifies heavy metals. Milling, however, also introduces supplemental metals (Fe, Ni, Cr, Mn…), following wear of both steel balls and housing. Milling moreover reduces the particle size of fly ash and disperses catalytic metal, potentially rising the reactivity of fly ash to form and destroy ‘dioxins’, i.e. polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD + PCDF or PCDD/F). To test this issue, model fly ash (MFA) samples were composed by mixing of silica, sodium chloride, and activated carbon, and doped with CuCl 2 . Then, these samples were first finely milled without any additives for 0 h (original sample), 1 h and 8 h, and the effect of milling time (and hence particle size) was investigated on the formation of polycyclic aromatic hydrocarbons (PAHs), and of polychlorinated phenols (CP), benzenes (CBz), biphenyls (PCB) and dioxins (PCDD + PCDF) during de novo tests at 300 °C for 1 h, thus simulating the conditions prevailing in the post-combustion zone of an incinerator, where dioxins are formed and destroyed. These compounds are all characterized by their rate of generation (ng/g MFA) and their signature, i.e. internal distribution over congeners as a means of gathering mechanistic indications. PAH and CBz total yield did not decrease in MC treated MFA with milling time, while total pentachlorophenol (PeCP), PCB and PCDD/F yield decreased up to 86, 94 and 97%, respectively. International Toxic Equivalents (I-TEQ) concentration decreased more than 90%, while degree of chlorination varied inconsistently for PCB and PCDD/F, and average congener patterns of PCDD/F do not vary considerably with milling time for both gas and solid phase.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
NANO
·
2020
·
IF 1.566
H. Zhang,S. H. Sun,J. C. Liu,F. Hong,Y. Zhu,B. Zhou,Y. M. Hu
Irregular rod-like bismuth sulphochloride (BiSCl) was synthesized by a high efficiency process in which BiCl 3 and Bi 2 S 3 were fully ground and mixed in N 2 atmosphere followed by a sintering at 227 ∘ C for 9 h to achieve crimson BiSCl powder. The products were characterized by X-ray powder diffraction (XRD) and scanning electronic microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). The BiSCl is an n-type semiconductor with a bandgap of 1.9 eV. In the temperature range of 300–500 K, thermal conductivity, electrical conductivity, Seebeck coefficient and thermoelectric figure of merit ZT of the BiSCl were tested and calculated. It is resulted that the BiSCl has a thermal conductivity of 0.45 Wm −1 K −1 at 500 K and a Seebeck coefficient of −579 μVK −1 at 400 K. This work will help inform future in-depth studies on possible applications of BiSCl in the fields of thermoelectricity, optoelectronics and photocatalyticity.
研究领域:
材料科学
·
物理化学
·
能源材料
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Ze-Chen Gao,Yi-Li Lin,Bin Xu,Ying Xia,Chen-Yan Hu,Tian-Yang Zhang,Hao Qian,Tong-Cheng Cao,Nai-Yun Gao
The effect of bromide and iodide on the transformation of humic acid (HA) and algal organic matter (AOM), and the formation of disinfection by-products (DBPs) during UV/chlorination were investigated. Experimental results indicated that the halides effectively inhibited mineralization, with multiple changes in organic molecule transformation due to differences in formation and speciation of reactive halogen species and free halogen. As a consequence, bromide and iodide also played important roles in DBP formation. The DBP yields in HA-containing water during UV/chlorination decreased in the order of iodide loaded > freshwater ≫ bromide loaded, whereas DBP formation in AOM-containing water decreased remarkably with halides added (freshwater > bromide loaded ≫ iodide loaded) at high UV fluence . Moreover, Pearson correlation analysis exhibited weaker correlation between DBPs and water parameters in AOM-containing water, while DBPs in HA-containing water exhibited better correlation with water parameters. For both simulated waters, the theoretical toxicity was calculated and peaked in bromide-containing water, whereas the calculated toxicity in iodide-containing water was comparable or slightly higher than that in freshwater. Therefore, UV/chlorine treatment may achieve good quality water with reduced DBP-associated toxicity in freshwater or iodide-containing water (iodide only), but careful consideration is needed when purifying source waters containing bromide (bromide only), especially for AOM/bromide-containing water.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yue Wu,Yangwen Chen,Shouqiang Huang,Guobiao Li,Shunping Sun,Yong Jiang,Guobin Liang,Songjian Zhao,Weiqiao Liu
The chloride (Cl − ) ions in wastewater are difficult to remove, since there is a lack of effective and recyclable chloride removal agents. In this study, the bismuth ferrites (BFO) are first explored as chloride removal agents, and their oxidation or precipitation effects on the Cl − removal are studied. In the BFO samples, the crystal phases of BiFeO 3 and Bi 2 FeO 4 have very limited contributions to the Cl − removal, while the enhanced removal ability is exhibited with the increase of Bi 25 FeO 40 . When the mass percentage of Bi 25 FeO 40 reaches 70%, high Cl − removal efficiencies of 80–90% are achieved, which even exceeds 95% for pure Bi 25 FeO 40 . The morphology and structure characterizations reveal that the excellent Cl − removal performance of Bi 25 FeO 40 is determined by its unstable chemical structure due to the sharing of Bi 5+ and Fe 3+ ions in the tetrahedral positions. The density of states and electron localization function of Bi 25 FeO 40 demonstrate that its Fe and O bonding is weaker than those of BiFeO 3 and Bi 2 FeO 4 , resulting in the easier breaking of the Fe 3+ /Bi 5+ -O bonds to release Bi 5+ ions, which have oxidation ability for the formation of OH and Cl radicals to enhance the Cl − removal efficiency.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 9
·726
·
IF 3.444
Jian Wang,Hainan Zhao,Jianfei Song,Tingyu Zhu,Wenqing Xu
Manganese oxide catalysts, including γ-MnO2, Mn2O3and Mn3O4, were synthesized by a precipitation method using different precipitants and calcination temperatures. The catalytic oxidations of benzene and 1,2-dichloroethane (1,2-DCE) were then carried out. The effects of the calcination temperature on the catalyst morphology and activity were investigated. It was found that the specific surface area and reducibility of the catalysts decreased with the increase in the calcination temperature, and both the γ-MnO2and Mn3O4were converted to Mn2O3. These catalysts showed good activity and selectivity for the benzene and 1,2-DCE oxidation. The γ-MnO2exhibited the highest activity, followed by the Mn2O3and Mn3O4. The high activity could be associated with the large specific surface area, abundant surface oxygen species and excellent low-temperature reducibility. Additionally, the catalysts were inevitably chlorinated during the 1,2-DCE oxidation, and a decrease in the catalytic activity was observed. It suggested that a higher reaction temperature could facilitate the removal of the chlorine species. However, the reduction of the catalytic reaction interface was irreversible.Keywords:benzene;1,2-Dichloroethane;catalytic oxidation;manganese oxide catalysts
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）