JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2023
·
IF 6
Yongdi He,Jinou Song,Yuan Zhuang,Yongfeng Liu,Jibiao Xie
In order to investigate the effects of 1- nitropropane ( 1- NP) on the pyrolysis of n- hexane , the pyrolysis processes of pure n- hexane and n- hexane/ 1- NP mixture in a jet-stirred reactor (JSR) were experimentally studied at atmospheric pressure with the technique of synchrotron ultraviolet photoionization mass spectrometry (SVUV-PIMS). The pyrolysis experiments of pure n- hexane and n- hexane/ 1- NP mixture were performed in the temperature ranges of 673–1143 K and 598–1128 K, respectively. The species pools for the pyrolysis of pure n- hexane and n- hexane/ 1- NP mixture were comprehensively determined and 25 species for pyrolysis of pure n- hexane versus 18 species for pyrolysis of n- hexane/ 1- NP mixture were identified. Based on the photoionization mass spectra scanned at different photon energies, the mole fraction profiles of all the pyrolysis species were evaluated. The experimental results showed that the initial pyrolysis temperature of n- hexane was observably reduced by 75 K with the addition of 1- NP, and the initial formation temperatures (IFTs) of some major pyrolysis products and important intermediates were correspondingly reduced. A high degree of conformity in the species pools of the pyrolysis of pure n- hexane and n- hexane/ 1- NP mixture (at both low and atmospheric pressures) was observed. On the basis of the experimental observations, modeling simulations and mechanisms proposed in previous studies, the low-temperature mechanisms for the 1- NP-initiated pyrolysis of n- hexane were discussed. A mechanism, including unimolecular dissociation reactions of 1- NP, radical reactions to produce highly active radicals, H-abstraction reactions of n- hexane and subsequent C-C bond dissociation reactions of hexyl radicals, was proposed.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 36
·85578-85591
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IF 5.8
Tang Jielin,Qin Jinyan,Kuerban Guzailinuer,Li Jiayi,Zhou Qinyu,Zhang Hongdan,Sun Rongli,Yin Lihong,Pu Yuepu,Zhang Juan
As an emerging flame retardant, organic phosphate flame retardants have been extensively used worldwide. The aim of this study is to determine the effects of TnBP on neurobehavior of Caenorhabditis elegans ( C. elegans ) and its mechanisms. L1 larvae of wild-type nematodes (N2) were exposed to TnBP of 0, 0.1, 1, 10, and 20 mg/L for 72 hours. Then, we observed that the body length and body width were inhibited, the head swings were increased, the pump contractions and chemical trend index were reduced, the production of reactive oxygen species (ROS) was increased, and the expression of mitochondrial oxidative stress related genes ( mev-1 and gas-1 ) and P38 MAPK signal pathway-related genes ( pmk-1 , sek-1 , and nsy-1 ) was altered. After reporter gene strains BZ555, DA1240, and EG1285 were exposed to TnBP of 0, 0.1, 1, 10, and 20 mg/L for 72 hours, the synthesis of dopamine, glutamate, and Gamma-Amino Butyric Acid (GABA) was increased. In addition, the pmk-1 mutants (KU25) led to the sensitivity of C. elegans to TnBP in terms of head swings. The results showed that TnBP had harmful effects on the neurobehavior of C. elegans , oxidative stress might be one of the mechanisms of its neurotoxicity, and P38 MAPK signal pathway might play an important regulatory role in this process. The results revealed the potential adverse effects of TnBP on the neurobehavior of C. elegans .
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Haimei Liu,Cheng Qian,Tao Wang,Sheng Wang
Introducing oxygen vacancies (Vo) into TiO 2 photocatalyst has been considered an effective strategy for improving solar photocatalytic activity. In this study, we used dodecylamine as a structure-directing agent to prepare amorphous hydrated TiO 2 spheres through a simple hydrolysis reaction. After calcination at 500 °C for 2h, we successfully synthesized spherical anatase TiO 2 with Vo mediated by N doping. By decorated with 1 wt% Pt as a cocatalyst, the resulting Vo-containing N-TiO 2 -2h spheres exhibited excellent performance under ultraviolet–visible illumination. The catalyst showed a hydrogen evolution rate of 1183.97 μmol g -1 h −1 , which is 1.4 times greater than that of the commercial anatase TiO 2 spheres with the same specific surface area. The enhanced photocatalytic activity of the Vo-containing Pt/N-TiO 2 -2h for hydrogen generation is attributed to that N-doping-induced Vo, which can produce electron trapping states to inhibit the direct recombination of photogenerated carriers. The presence of Pt co-catalysts further suppresses the recombination of electron–hole pairs, accelerating the rate of the entire photocatalytic reaction.
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Nano Energy
·
2023
·
IF 17.6
Wei Zhong,Siwu Li,Mengchuang Liu,Qiang Wu,Ziqi Zeng,Shijie Cheng,Jia Xie
The self-sacrificing Li 2 C 2 O 4 is a promising lithium replenisher benefiting from its high specific capacity, residue-free and low-cost properties. However, the intrinsic low electrochemical activity leads to a decomposition potential up to 4.7 V, posing a challenge for the compatibility of electrolyte and cathode materials . Herein, a three-dimensional (3D) hierarchical spherical Mo 2 C/N-doped graphene co-catalysts is synthesized by self-polymerization and high-temperature annealing. It is shown that the synergistic catalytic effect of Mo 2 C and N-doped activated graphene enhances the reactivity of Li 2 C 2 O 4 and the hierarchical three-dimensional conducting network accelerates the electron-ion transport. When the nano-Li 2 C 2 O 4 is homogeneously encapsulated in the spherical catalytic center using a freeze-drying technique, the electrochemical reaction of Li 2 C 2 O 4 is greatly promoted, resulting a significant drop of decomposition potential from 4.7 V to 4.16 V. As a result, the specific capacity of Gr||LFP and SiC||LFP full cells with composite lithium replenisher can be increased by 15% and 22%, respectively. Moreover, the solid electrolyte interface (SEI) is appropriately strengthened with pre-lithiation and thus guarantees superior cycling performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shangqing Qu,Jinhao Chen,Jikun Chen,Guohong Cai,Yonggang Wang,Zhongnan Guo,Jing Zhao,Quanlin Liu
Pavonite homologues are semiconductors that show potential for thermoelectric applications. Herein, we report the synthesis of a quaternary selenide, In 0.5 Mn 2 Bi 3.5 Se 8 , that exhibits good thermal stability below 1032 K. Whereas most pavonite compounds exhibit the metallic properties of degenerate semiconductors, In 0.45 Mn 2.17 Bi 3.38 Se 8 possesses a band gap of 0.85 eV. In addition, its electrical conductivity and Seebeck coefficient exceed 3 S/cm and 300 μV/K at 810 K, respectively, with the compound mainly displaying semiconductor properties . In 0.45 Mn 2.17 Bi 3.38 Se 8 exhibits paramagnetism at room temperature followed by a paramagnetic-to-antiferromagnetic transition at ∼10.2 K. Our findings enrich the current understanding of the pavonite homologous series, providing useful insight for future exploration in related fields.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xin Lei,Yu Lei,Shuangshuang Cheng,Xin Yang
N -nitrosamines are great concern in potable water reuse. This study investigated the reaction kinetics of chlorine radicals (Cl • and Cl 2 •− ) with N -nitrosamines. The second-order reaction rate constants of Cl • ( k Cl • ) and Cl 2 •− ( k Cl2 •− ) with eight N -nitrosamines at pH 7.0 varied in the range of (5.02 ± 0.41)–(57.1 ± 4.25) × 10 8 M −1 s −1 and (0.46 ± 0.04)–(10.6 ± 0.73) × 10 8 M −1 s −1 , respectively. The numbers of methylene groups (#−CH 2 −) showed a good positive correlation with k Cl • (R 2 = 0.71), but not with k Cl2 •− . The degradation of eight N -nitrosamines under UV/chlorine advanced oxidation process (AOP) slightly increased by 1–18% in contrast to UV irradiation alone, and Cl − in the AOPs cannot inhibit their removal. The results improved the understanding of the fate of N -nitrosamines in chlorine radical-involved AOPs.
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Current Analytical Chemistry
·
2022
·Vol. 18
·期 9
·1017-1028
·
IF 2.374
Chang Wenzhuo,Zhu Yongxi,Ma Yongjun,Zheng Zhixiang,Wang Chunming
Background: The use of modified electrochemical sensors is essential for the detection of antibiotic drug abuse. The main objective of this article is to develop a silk-derived carbon material for the modification of pyrolytic graphite electrodes (PGE) for the sensitive detection of
chloramphenicol (CAP). Methods: We proposed a pyrolysis synthesis of porous carbon nanosheets (Fe-Silk PNC) using silk as a precursor. Properties of carbon nanosheets had been improved by the Fe-Nx atoms doping, which was attributed to the β-sheet structures and amino-group-rich
chemical structures of silk fibroin, and this material has been used to modify the pyrolytic graphite electrode (PGE) for the electrochemical determination of CAP. Scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR) were used to determine the morphology and
properties of Fe-Silk PNC surface. In the electrochemical determination, cyclic voltammetry (CV) showed a superior current response while bare electrode performed an inferior result. In addition, different scan rate, pH, accumulation time and accumulation potential were carefully optimized,
which proved that this material is appropriate for CAP detection. Finally, differential pulse voltammetry (DPV) method was used for quantitative measurements. Results: In this study, DPV determination of CAP showed the linear relationship with increasing concentration ranged from 1 to
200 μM, and the low detection limit was 0.57 μM (S/N = 3). SEM and FT-IR results further demonstrated the N-doped carbon nanomaterials were successfully synthesized. With excellent sensing performance achieved, the practicability of the sensor has been evaluated to detect CAP in chicken,
shrimps and fish. Conclusion: In summary, a silk derived biomass porous carbon nanomaterial Fe-Silk PNC was simply fabricated and used as a novel electrode material. This kind of novel Fe-Silk PNC modified electrode exhibited excellent sensitivity, anti-interference ability, repeatability,
wide linear rang, and was successfully used for determination of CAP in real samples. Therefore, the biomass derived nanomaterial is expected to be used in new sensing materials.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chenyu Yang,Xiao Wang,Yongqiang Ren,Shaonan Gu,Qian Wang,Huan Li,Kun Yue,Tingting Gao,Guowei Zhou
Polymetallic oxide nanostructures with intricate architectures have become the promising subject of much recent investigations into high-efficiency electrode materials for lithium-ion batteries (LIBs). However, their smooth implementation is still plagued by the fabrication of multi-component structures as well as the delivered inadequate specific capacities. Here, complex NiFe 2 V 2 O 8 @ N -doped carbon nanostructures with hierarchically porous yolk-double shell spherical architectures via a facile template-free approach are developed and evaluated as the high-efficiency anode materials for LIBs. Benefited from the yolk-double shell constructions, impressively, the electrode harvests a high reversible capacity of 1347.6 mA h g −1 over 200 cycles without visible deterioration at 0.2 A g −1 , a robust rate capability (726.1 mA h g −1 at 5 A g −1 ), and a desirable cycle stability (75.6% capacity retention over 300 cycles at 1 A g −1 ). Such excellent electrochemical Li-ion storage capability is believed to result from the fast ion-diffusion kinetics enabled by the synergetic cation and oxygen redox because of the introduction of vanadium redox couples, which can be further boosted by capacitive-dominated surface electrochemical reaction. This work provides enlightening insights into the elaborate design and fabrication of complex porous yolk-shell-like nanostructures with intricate compositions for high-efficiency lithium storage.
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ChemistrySelect
·
2022
·Vol. 7
·期 40
·e202203024
·
IF 2.307
Xuehui You,Fang Liu,Guofei Jiang,Shuhua Chen,Beiya An,Rongli Cui
Graphical Degradation experiments of TC suggested that SCN/NT-2@PTFE composites showed the best photocatalytic performance under the optimal conditions, the degradation rate of tetracycline reached 99 % after 120 min of irradiation. The preparation of SCN/NT-2@PTFE composite membrane can solve the problem of difficult recovery and secondary contamination of powder catalysts. Herein we synthesized S-g-C 3 N 4 and N−TiO 2 catalysts by hydrothermal and calcination technologies and SCN/NT@PTFE membrane by a vacuum filtration method. The morphology and composition of the synthesized materials were analyzed by different characterization methods (SEM/HRTEM/XRD/XPS/UV-vis et.). The effects of different catalysts, pollutant concentrations, mass of catalyst and pH on the photo-degradation of tetracycline were investigated. The degradation rate of tetracycline by SCN/NT-2@PTFE membrane was as high as 99.9 % after 2 h of illumination. This was mainly because heterogeneous structure between S-g-C 3 N 4 and N−TiO 2 broadened the light absorption range and suppressed the carrier complex. Superoxide radicals (⋅O 2 − ) were proved to play a dominant role in the degradation reaction. After 20 days of stirring in water, the photocatalytic performance of membrane decreased slightly, demonstrating its good stability. The study of SCN/NT-2@PTFE membrane provides a new direction for the development of photocatalysis and membrane.
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LUMINESCENCE
·
2022
·Vol. 37
·期 10
·1725-1732
·
IF 2.613
Ping Li
Developing artificial nanoparticles with peroxidase-like activity have attracted great interests because their catalytic activity is not easy to lose under harsh conditions compared with natural enzymes. In this work, the N-doped carbon dots (CDs) were prepared; it was found that the N-doped CDs showed high peroxidase-like catalytic activity towards the reaction system of hydrogen peroxide:3,3′,5,5′-tetramethylbenzidine (TMB). The catalytic mechanism of the N-doped CDs was explored using electron spin resonance spectra, cyclic voltammetry methods and simulation of density functional theory calculations. This work can offer a new feasible method for synthesizing N-doped carbon quantum dots used as artificial peroxidases in biological and environment applications.
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Journal of CO2 Utilization
·
2022
·
IF 8.321
Jinsong Shi,Hongmin Cui,Jianguo Xu,Nanfu Yan,Shengyong You
Influences of porous carbon’s physicochemical properties on CO 2 adsorption vary with CO 2 pressure. The clarification of such complicated influences will undoubtedly be beneficial to the design and synthesis of carbonaceous adsorbents. To this end, in the current work we synthesized a series of N-doped hierarchically ordered micro-mesoporous carbons (NHOMCs). Ordered mesoporous polymer was synthesized with a solvent-free method using F127 as the soft template. After removing F127, the polymer was activated with KHCO 3 in the presence of urea at 700–800 °C. The obtained NHOMCs inherited the ordered structure of the polymer, and exhibited high surface area and nitrogen content. Synergistic effects of urea and KHCO 3 on nitrogen content and textural properties were discussed and revealed. At 25 °C, high CO 2 uptakes of 4.02 mmol/g (1 bar) and 15.42 mmol/g (20 bar) were achieved by the NHOMCs. We then systematically investigated the correlation between CO 2 uptake and physicochemical properties. The decisive factors of CO 2 uptakes at different pressures (1 bar, 5 bar, 10 bar, 20 bar) were analyzed. We believe the current work will provide helpful insights into the research of porous carbons for CO 2 adsorption.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 15
·4893-4902
·
IF 6.177
Keting Feng,Tao Sun,Xiaoyun Hu,Jun Fan,Dongyuan Yang,Enzhou Liu
Photocatalytic H2 evolution is a promising way to obtain green H2 due to its clean and sustainable characteristics. Herein, a series of 0D/2D Co0.85Se/TiO2 heterojunctions were fabricated through a successive two-step hydrothermal strategy. Among them, 15%-Co0.85Se/TiO2 displays the most excellent H2 rate of 2312.5 μmol g−1 h−1, which is 10.3 times and 10.8 times higher than that of TiO2 and Co0.85Se, respectively. And the H2 production rate per electrochemically active surface area of 15%-Co0.85Se/TiO2 is 127.41, which is obviously more than that of TiO2 (14.17) and Co0.85Se (5.39). Based on the core-level alignment method and free radical capture tests, the enhanced activity mainly resulted from the higher electrochemically active surface area and the formation of a p–n heterostructure between TiO2 and Co0.85Se. This research provides a strategy for the development of noble metal-free nanocomposites for efficient photocatalytic H2 production.
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