Canadian Journal of Chemistry
·
2018
·Vol. 96
·期 8
·
IF 1.084
Yongshu Li,Nizhou Xu,Guangyao Mei,Yun Zhao,Yiyong Zhao,Jinghui Lyu,Guofu Zhang,Chengrong Ding
A mild, simple process for the effective aerobic oxidative deoximation of a wide range of ketoximes and aldoximes has been developed that utilizes Fe(NO3)3·9H2O as the single catalyst and molecular oxygen as the green oxidant. The environmentally benign protocol provides moderate to excellent yield and broad functional groups tolerance and is a valuable synthetic method for practical applications. According the relevant verification experiment, a plausible mechanism has been proposed.
研究领域:
有机化学
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绿色化学
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DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 8
·3859-3866
·
IF 2.289
Bao Wentao,Tian Hua,Jiang Yang,Zhu Kaixin,Zhang Runa,Tan Yu,Li Wang,Yu Zhifeng,Wang Lin
Ni–Al layered double hydroxide with nitrate anions as interlayer building blocks was synthesized by a dual-anion intercalating strategy of hydroxyl and nitrate anions during a facile co-precipitation process. In this case, nitrate anions with low charge densities are capable to expand the interplanar spacing between host layers of Ni–Al layered double hydroxide in the replacement of pristine carbonate anions, benefiting to the diffusion of electrolyte ions to active sites within electrodes. Moreover, the optimization for packed arrangement of Ni–Al layered double hydroxide with nitrate anions nanosheets can be effectively realized by modulating reactant concentrations, leading to the formation of nanolayered structure in favor of increasing electrolyte accessible active sites within electrodes. The optimized Ni–Al layered double hydroxide with nitrate anions achieves a high specific capacitance of 1616 F g −1 at 1 A g −1 together with a capacitance retention of 82% at 10 A g −1 and good cycling stability.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
CHINESE SCIENCE BULLETIN
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2010
·Vol. 55
·期 35
·4018-4025
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IF 0.917
Wang XiaoPeng,Tong ShengRui,Ge MaoFa,Wang WeiGang,Wang DianXun
The electronic structures of six mono-terpenoids and two of their oxygenated derivatives were studied by He I photoelectron spectroscopy (PES). The observed bands were interpreted on the basis of empirical arguments and theoretical calculations. The first vertical ionization potentials for β -pinene, α -terpinene, terpinolene, γ -terpinene, limonene, myrcene, citral, and terpinene-4-ol were determined to be 8.73, 7.57, 8.26, 8.30, 8.53, 8.68, 8.71, and 8.77 eV, respectively. Most of these values have not been determined by PES before. The correlations of the first vertical ionization potentials of these compounds to the natural logarithms of rate constants for their reactions with the radicals OH, NO 3 , and O 3 were determined. The correlation coefficients for their reactions with OH, NO 3 , and O 3 were 0.97, 0.91, and 0.95, respectively. This method is a powerful technique for predicting the rate constants for the atmospheric oxidation reactions of terpenoids.
研究领域:
物理化学
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大气化学
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环境科学
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Zimi Ye,Zhongyu Guo,Jieqiong Wang,Lilan Zhang,Yuchen Guo,Chihiro Yoshimura,Junfeng Niu
Acebutolol (ACE) has been widely used for the treatment of cardiovascular disorders, and its photochemical fate in natural waters is a matter of concern due to its ubiquitous occurrence and its toxicity to aquatic organisms. In this study, the photodegradation of ACE in river water and synthetic waters were investigated under simulated sunlight irradiation. The results demonstrated that ACE photodegradation rate in river water was 3.2 times higher than that in pure water. Then the influences of HCO 3 − , NO 3 − and DOM on ACE photolysis were investigated under their concentrations similar with the ones in river water. ACE photodegradation was significantly enhanced in the presence of HCO 3 − alone, and the scavenging experiments and the electron paramagnetic resonance experiments together proved that HCO 3 − could be oxidized by triplet-excited state of ACE to generate CO 3 •- , which subsequently played a key role in ACE degradation. The presence of both NO 3 − and DOM also increased the ACE photodegradation rates, and •OH and 3 DOM* were found to be involved in the degradation. In addition, when DOM was added to a solution with HCO 3 − , the enhancement effect of HCO 3 − on ACE photodegradation was weakened due to the scavenging of CO 3 •- by DOM combined with the light screening effect of DOM.
研究领域:
环境科学
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化学
·
水处理
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DOI
PubMed
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2018
·
IF 2.836
Shuyan Wang,Lin Du,Jianqiang Zhu,Narcisse T. Tsona,Shijie Liu,Yifeng Wang,Maofa Ge,Wenxing Wang
Allyl acetate (AA) is widely used as monomer and intermediate in industrial chemicals synthesis. To evaluate the atmospheric outcome of AA, kinetics and mechanism of its gas-phase reaction with main atmospheric oxidants (O3, OH, Cl, and NO3) have been investigated in a Teflon reactor at 298 ± 3 K. Both absolute and relative rate methods were used to determine the rate constants for AA reactions with the four atmospheric oxidants. The obtained rate constants (in units of cm3 molecule–1 s–1) are (1.8 ± 0.3) × 10–18, (3.1 ± 0.7) × 10–11, (2.5 ± 0.5) × 10–10, and (1.1 ± 0.4) × 10–14, for reactions with O3, OH, Cl, and NO3, respectively. While results for reactions with O3, OH and Cl are in good agreement with previous studies, the kinetics for the reaction with NO3 is reported for the first time in this study. On the basis of determined rate constants, the tropospheric lifetimes of AA are τO3 = 9 days, τOH = 5 h, τCl = 5 days, τNO3 = 2 days. On the basis of the products study, reaction mechanisms for these oxidations have been proposed and the reaction products were detected using thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS) and Fourier transform infrared spectroscopy (FTIR). Results show that the main products formed in these reactions are carbonyl compounds. In particular, 2-oxoethyl acetate was detected in all four AA oxidation reactions. Compared to previous studies, several new products were determined for reactions with OH and Cl. These results form a set of comprehensive kinetic data for AA reactions with main atmospheric oxidants and provide a better understanding of the degradation and atmospheric outcome of unsaturated acetate esters in the troposphere, during both daytime and nighttime.
研究领域:
大气化学
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环境科学
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反应动力学
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空气污染
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DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
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2017
·
IF 2.847
Jianqiang Zhu,Shuyan Wang,Narcisse T. Tsona,Xiaotong Jiang,Yifeng Wang,Maofa Ge,Lin Du
Rate constants at room temperature (293 ± 2 K) and atmospheric pressure for the reaction of methyl n-propyl ether (MnPE), CH3OCH2CH2CH3, with OH and NO3 radicals and the Cl atom have been determined in a 100 L FEP-Teflon reaction chamber in conjunction with gas chromatography-flame ionization detector (GC-FID) as the detection technique. The obtained rate constants k (in units of cm3 molecule–1 s–1) are (9.91 ± 2.30) × 10–12, (1.67 ± 0.32) × 10–15, and (2.52 ± 0.14) × 10–10 for reactions with OH, NO3, and Cl, respectively. The products of these reactions were investigated by gas chromatography-mass spectrometry (GC-MS), and formation mechanisms are proposed for the observed reaction products. Atmospheric lifetimes of the studied ether, calculated from rate constants of the different reactions, reveal that the dominant loss process for MnPE is its reaction with OH, while in coastal areas and in the marine boundary layer, MnPE loss by Cl reaction is also important.
研究领域:
大气化学
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环境科学
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化学动力学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
·
IF 7.8
Shuyang Shi,Baozhong Ma,Ding Zhao,Xiang Li,Shuang Shao,Chengyan Wang,Yongqiang Chen
The new process ‘coal gangue/fly ash – HNO 3 pressure leaching (NAPL) –low-temperature pyrolysis’ was proposed by our team, which aimed to achieve the transformation of coal-based solid wastes from harmless to Al resource. For cost control, the regeneration of HNO 3 at a low cost was crucial for the process. Following NAPL of coal gangue and fly ash, massive amounts of Al(NO 3 ) 3 ·9 H 2 O were collected, with a decomposition temperature as low as 523 K. The energy consumption for low-temperature pyrolysis could be supplied by the combustion of residual carbon (6.96 wt%) during the thermal activity of coal gangue, allowing HNO 3 to be regenerated and recycled without extra heat supply . However, little research has been done on the pyrolysis behavior and kinetics of Al(NO 3 ) 3 ·9 H 2 O, which was examined in this study. The pyrolysis characteristics of Al(NO 3 ) 3 ·9 H 2 O were assessed by TG-DSC analysis. Further experiments and XRD/FTIR/MS analysis revealed that phase evolution of Al(NO 3 ) 3 ·9 H 2 O followed the sequence of Al(NO 3 ) 3 ·9 H 2 O→ Al(NO 3 ) 3 ·nH 2 O→ Al(NO 3 ) 3 ·3Al(OH) 3 ·5/2 H 2 O→ AlOOH→ Al 2 O 3 . Subsequently, the thermodynamic (∆ G , ∆ H , ∆ S ) and kinetic ( E a , A ) parameters were calculated based on the thermogravimetric data by the iso-conversional methods. And the mechanism models and functions were identified via the Malek method. Finally, the economic evaluation of pyrolysis indicated that 5.04 × 10 –3 Nm 3 of natural gas was consumed during pyrolysis of one mole Al(NO 3 ) 3 ·9 H 2 O, equivalent to 44.33 $ per ton of Al 2 O 3 . As a basic research of Al(NO 3 ) 3 ·9 H 2 O pyrolysis, this paper enhances related theories of the NAPL process.
研究领域:
材料科学
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热工工程
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无机化学
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废弃物资源化
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过程工程
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DOI
高影响因子
MARINE POLLUTION BULLETIN
·
2026
·
IF 4.9
Diyi Liu,Lu Liu,Ping Yin,Yan Tian,Jing Zhang
17β-Estradiol (E2), a typical endocrine-disrupting chemical, is widely detected in various aquatic environments, including rivers, lakes, groundwater, estuaries, and coastal waters, posing significant ecological and health risks. Photodegradation is a key pathway for the transformation and removal of E2 from aquatic systems. This study investigated the effects of dissolved organic matter (DOM) from different sources and common inorganic anions (Cl − and NO 3 − ) on E2 photodegradation under simulated solar irradiation. The results indicated that the excited triplet state of DOM ( 3 DOM*), generated upon light absorption, was the key reactive species driving E2 photodegradation. Among the DOM sources examined, humic acid exhibited the strongest promotive effect on E2 photodegradation. Correlation analysis confirmed that terrestrial humic-like components within seawater DOM were the primary contributors to 3 DOM* formation. Seawater DOM from nearshore areas exhibited higher steady-state concentrations of 3 DOM* owing to greater terrestrial input. Both Cl − and NO 3 − effectively accelerated E2 photodegradation, and the E2 degradation rate increased with their concentrations. In contrast, the coexistence of Cl − , NO 3 − , and DOM inhibited E2 photodegradation. In DOM-dominated systems, the main transformation pathways of E2 involved oxidation and hydrolysis reactions on the phenolic ring. This study elucidates the effects of DOM source and water chemical composition on E2 photodegradation, which is crucial for accurately predicting its environmental fate and ecological risks. Moreover, the findings provide valuable insights into the photochemical transformation of other emerging organic contaminants.
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DOI
PubMed
高影响因子
Small
·
2024
·Vol. 20
·期 37
·2400549
·
IF 13
Yaoguo Shen,Mingliang Ding,Gang Chen,Yingjie Luo,Sangen Zhao,Junhua Luo
A large optical anisotropy is the most important parameter of birefringent crystals. Integrating π-conjugated groups with large polarizable anisotropy into target compounds is a common strategy for constructing brilliant birefringent crystals. However, the key problem is to enhance the density of the birefringence-active units and further arrange them parallelly. In this study, three novel birefringent crystals, C 9 H 7 NBrX (X = Cl, Br, NO 3 ), are successfully synthesized by introducing a new birefringence-active [C 9 H 7 NBr] + unit. Interestingly, these compounds feature similar layered structures but exhibit different optical anisotropies at 550 nm (0.277 for C 9 H 7 NBrCl, 0.328 for C 9 H 7 NBrBr, and 0.401 for C 9 H 7 NBrNO 3 ) owing to the different anions in them. Particularly, the small trigonal planar NO 3 anions perfectly fill the interstices of the π-conjugated [C 9 H 7 NBr] + groups with large optical anisotropy, with the resulting compound C 9 H 7 NBrNO 3 showing superior optical properties compared to the others. The above findings provide strategies for designing new optical materials with large birefringence by matching birefringence-active groups of different sizes. Additionally, a new theory for predicting and comparing the polarizability anisotropy of compounds is proposed, which would guide in exploring large birefringent crystals.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Xiao Yu,Banghong Deng,Lixia Yang,Moliang Zou,Zhenglin Chen,Yixuan Fan,Zhihui Wei,Kai Chen,Mingxia Lu,Tiantian Ying,Jie Zhang,Weili Dai
Mn 2 O 3 is a conventional catalyst that is applied in photothermal catalytic oxidation of toluene while regular anions like SO 4 2- , Cl - , and NO 3 - from different Mn precursors are left in Mn 2 O 3 . When applied in toluene degradation, the declining activity of Mn 2 O 3 is always observable because the residual anions block the Mn 4+ /Mn 3+ active sites, shield the oxygen vacancies, and cube the production of active oxygen species (O 2 - , O - ). Herein, it is found that the residual SO 4 2- , Cl - , and NO 3 - make Mn 2 O 3 incapacitated in deeply oxidizing the intermediates and cutting off the reaction process, and their influence ranks in the order of SO 4 2- >Cl - >NO 3 - . Compared with pristine Mn 2 O 3 , the drops in CO 2 conversion efficiency account for 11 %, 60 %, and 73 %, respectively. Nevertheless, rinsing with water is an effective method to remove the residual anions, and the more the rinsing, the better the toluene mineralization degree. This work provides a profound cognition of the deactivation mechanism of SO 4 2- , Cl - , and NO 3 - and points out an effective way to abate their negative effect for the first time.
研究领域:
环境科学
·
催化材料
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Hui Li,Lunchao Duan,Hong Wang,Yajun Chen,Fenghe Wang,Shengtian Zhang
The photolytic behaviour of sulfadiazine (SD) under ultraviolet (UV) radiation was investigated. The results showed that the SD photolysis fitted quasi-first-order kinetics model. The acid condition is favourable to the UV photolysis of SD because of more free radicals compared to the neutral and cationic conditions. NO 3− inhibited the SD photolysis, which may be resulted from the competition of NO 3− with SD for UV. Conversely, Cd 2+ could promote the SD photolysis, because the metal ions reduce the reaction activation energy of the rate determining step. This research could serve as reference for SD photolysis contained in wastewater under UV radiation.
研究领域:
环境科学
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药学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 11
·
IF 1.768
Lian Tang,Yi Zheng,Shiyan Chen,Lei Wang,Huaping Wang
Flexible and nonpoisonous X-ray-shielding membranes supported by bacterial cellulose (BC) were prepared, in which X-ray-shielding materials were of microcapsule structure by using polyvinyl alcohol as shell and lead salt as core. The effect of the wall/core interaction and the amount of cross-linking agent were taken into consideration to find the optimal reaction conditions. The morphology, microcapsule size, and lead salt release properties were investigated. After supported by BC, the flexible and potable membranes for X-ray radiation protection were prepared and the shielding properties were evaluated, which indicated a good X-ray-shielding material. We set up a new method to prepare flexible and portable X-ray radiation protection membranes. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43120.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）