Journal of Physical Chemistry C
·
2019
·
IF 4.309
Chunlei Wang,Qi Yao,Lina Cao,Junjie Li,Si Chen,Junling Lu
Preferential oxidation of CO in H2 (PROX) has been regarded as the most promising on-board approach to remove the trace levels of CO (∼1%) present in hydrogen fuels and thus to protect the Pt electrodes of proton exchange membrane fuel cells (PEMFCs) against CO poisoning. However, development of an active and selective catalyst toward CO oxidation in a broad low-temperature range remains challenging due to the competitive hydrogen oxidation reaction. Here, we report that selective deposition of the FeOx overcoat onto SiO2-supported Ir nanoparticles using the atomic layer deposition (ALD) technique allows precisely tailoring Ir–FeOx interfaces for optimizing catalytic performance in the PROX reaction. Compared to the uncoated Ir/SiO2 sample, FeOx-coated Ir/SiO2 samples exhibited remarkable activity enhancements, where we observed a volcano trend of the improved activity as a function of the numbers of FeOx ALD cycles. The optimized catalytic performance was achieved on a 1.5 nm Ir/SiO2 sample with two cycles of FeOx overcoating, by achieving complete CO conversion in a broad temperature range of 60–180 °C in the PROX reaction, which is the broadest temperature range over Ir-based catalysts reported in the literature so far. We noticed that the activity improvement over these samples was much less pronounced in CO oxidation in the absence of H2, which implies that the formation of hydroxyls on the FeOx overcoat might be attributed to the large activity enhancement in the PROX reaction.
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高影响因子
ATMOSPHERIC ENVIRONMENT
·
2020
·
IF 4.039
Yunchao Wu,Xiaoping Huang,Zhijian Jiang,Songlin Liu
The phosphorus in precipitation provides a significant fraction of the bioavailable phosphorus to fresh and marine waters. To identify the possible sources and interpret the atmospheric deposition processes of phosphorus, we measured the phosphate oxygen isotopes (δ 18 O P ) in the precipitation monthly from October 2015 to March 2017 in Daya Bay, South China Sea. The isotopic results show that the δ 18 O P values in the dry season (+19.60‰ to +25.80‰, +23.10‰ average) were significantly higher than those in the wet season (+12.52‰ to +20.11‰, +16.73‰ average), indicating a variable contribution from different phosphorus sources to the precipitation between seasons. The δ 18 O P value was primarily influenced by the phosphorus concentrations, rainfall, and air temperature. The exchange of phosphate molecules among phosphorus pools caused isotope dilution (wet season) or enrichment effects (dry season) during the seasonal shifts. The δ 18 O P value of the precipitation and the local end-members indicate that coal combustion (39% ± 16%), biomass burning (22% ± 18%), and soil (17% ± 13%) sources dominate in the dry season, whereas marine sources (28% ± 19%) and coal combustion (24% ± 12%) account for the highest proportion in the wet season using a MixSIAR model. The atmospheric wet deposition flux of phosphorus in Daya Bay was 379.0 μmol m −2 ·yr −1 . The wet deposition of phosphorus exhibits a significant seasonal trend with higher deposition fluxes in the wet season than in the dry season as a result of higher rainfall and source shifts (local sources to marine source) between seasons.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yingguang Zhang,Muyan Wu,Y.H. Kwok,Yifei Wang,Wei Zhao,Xiaolong Zhao,Haibao Huang,Dennis Y.C. Leung
A series of TiO 2 /MnO 2 heterojunction catalysts were fabricated through an in-situ hydrothermal method, and for the first time, catalysts with this heterojunction structure were used for VUV-PCO toluene degradation. After the MnO 2 coating, the TiO 2 /MnO 2 catalysts performed excellently for both VOCs degradation and residual ozone decomposition with removal efficiency reaching 96.0% and 99.9%, respectively. The enhanced photocatalytic activity towards toluene degradation could be attributed to the heterojunction structure of TiO 2 /MnO 2 , which provides excellent contact between MnO 2 and TiO 2 , and suppresses the recombination of photogenerated electron-hole pairs. Moreover, benefiting from the MnO 2 , the ozone generated in the system could be efficiently utilized and eliminated during the VUV-PCO process. The photocatalytic mechanism of TiO 2 /MnO 2 for the toluene degradation and ozone decomposition was proposed.
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高影响因子
Journal of Chemistry
·
2020
·Vol. 2020
·期 1
·8758432
·
IF 1.79
Wu Yi-cheng,Yang Ai-li,Gao Wei,Fu Hai-yan,Wang Ze-jie
The roles of Al 2 O 3 nanoparticles on the removal of carbamazepine (CBZ) by Chlorella vulgaris immobilized in sodium alginate gel beads were for the first time investigated. The optimum conditions to prepare immobilized C. vulgaris beads with addition of Al 2 O 3 nanoparticles were determined as follows: C. vulgaris density was 3.0 × 10 6 cells for 1 mL sodium alginate solution, Al 2 O 3 nanoparticle concentration was 0.5 g/L, and concentrations of sodium alginate and CaCl 2 were 1.6% and 1%, respectively. The results showed that the proposed algae beads achieved the highest CBZ removal rate of 89.6% after 4 days of treatment, relative to 68.84%, 48.56%, and 17.76% in sodium alginate-immobilized C. vulgaris , free microalgae, and Al 2 O 3 nanoparticle alginate beads, respectively. The results also showed that the CBZ removal rate increased with more proposed algae beads, while decreased with increased bead diameter. The algae beads exhibited excellent CBZ removal ability even after three recycles. This work provided an economical and effective approach to remove CBZ from water.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Lihua Cao,Huiling Li,Xiaolin Liu,Shuwu Liu,Lin Zhang,Wenhui Xu,Haoqi Yang,Haoqing Hou,Shuijian He,Yan Zhao,Shaohua Jiang
Rational design of electrode with hierarchical charge-transfer structure and good electronic conductivity is important to achieve high specific capacitance and energy density for supercapacitor, but it still remains a challenge. Herein, a nitrogen, sulfur co-doped pollen-derived carbon/graphene (PCG) composite with interconnected “sphere-in-layer” structure was fabricated, in which hierarchically pollen-derived carbon microspheres can serve as “porous spacers” to prevent the agglomeration of graphene nanosheets. The optimized PCG composite prepared with 0.5 wt% of graphene oxide (PCG-0.5) exhibited high specific capacitance (420 F g −1 at 1 A g −1 ), rate performance (280 F g −1 at 20 A g −1 ), and excellent cycling stability with 94% of capacitance retention after 10,000 cycles. The symmetrical device delivered a remarkable energy density of 31.3 Wh kg −1 in neutral medium. Moreover, density functional theory calculation revealed that PCG electrode possessed the accelerated charge transfer and enhanced electronic conductivity, thus ensuring a remarkable electrochemical performance. This work may afford an effective strategy for the development of biomass-derived carbon electrodes with novel charge-transfer structure toward supercapacitor applications.
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高影响因子
ISPRS International Journal of Geo-Information
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2020
·Vol. 9
·期 1
·20
·
IF 2.239
Yu Tian,Bingxi Liu,Yuandong Hu,Qing Xu,Ming Qu,Dawei Xu
Hemeroby is an integrated indicator used to measure the impact and degree of all human interventions on ecological components or ecosystems. The constant exploitation of resources is a strong interference of human beings to the natural environment. With the depletion of non-renewable resources, some cities with resource exploitation as their main industry—“resource-based cities”—are facing great development pressure. In order to quantify the impact of human disturbance on the natural environment and provide some scientific support for policy makers of the resource-based city, we used remote sensing images and landscape pattern metrics, introduced the synthetic hemeroby index model and analyzed the relationship between human disturbance and landscape pattern during 1990–2017. The results showed that: (1) The hemeroby in Daqing continued to rise during 1990–2017, and the main factor was the continuous expansion of the construction land and the reclamation of farmland. (2) In the areas with different hemeroby, there were significant differences in landscape pattern. In the areas with high-level hemeroby, the heterogeneity of landscape pattern was low, the aggregation among patches was high, and the shape of patches was regular, whereas the landscape pattern in the areas with medium-level hemeroby was just opposite. Although the heterogeneity of landscape pattern and the aggregation among patches were high in the areas with low-level hemeroby, the complexity of landscape was low and the shape of patches was regular. (3) In the temporal dimension, the increase of hemeroby contributed to the complexity of patch shape, the decrease of the aggregation among patches, and the fragmentation of landscape pattern. In the spatial dimension, the response in landscape pattern to human disturbance was relatively insensitive in the areas with low-level hemeroby, and this response was basically same in the high-level hemeroby and the whole study areas.
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高影响因子
Talanta Open
·
2023
·
IF 0
Yuting Kang,Baoshan Zhang,Huiru Li,Guoliang Huang,Huiqing Lv,Kezhi Jiang
The tricarboxylic acid cycle is an important metabolic route in almost all living bodies, yet current analytical methods for the detection of the relevant tricarboxylic acids (TCAs) in biological samples are still unsatisfactory due to their complex matrix and physicochemical properties. In this work, a sample method based on solid phase extraction (SPE) in conjunction with liquid chromatography-mass spectrometry (LC-MS) analysis has been developed for the simultaneous determination of 7 TCAs, including α-ketoglutaric acid, malic acid, malonic acid, aconitic acid, citric acid, succinic acid and fumaric acid, in mice faeces. By treatment with macroporous styrene chelate resin and solid phase extraction, the matrix in mice feces was selectively and efficiently removed. Under optimized parameters, the limit of quantitation for the TCAs was in the range of 1-50 ng/mL, and the content of the TCAs in mice feces was determined with a recovery range of 76.2 % to 128.4 %. Interestingly, the content of malic acid, malonic acid, succinic acid and fumaric acid in the normal mice's feces was found to be 2-10 times higher than that of obese mice, indicating a new potential method for the diagnosis of obesity.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Chenchen Wang,Panpan Huang,Chunsheng Qiu,Jing Li,Shuailong Hu,Liping Sun,Yaohui Bai,Fu Gao,Chaocan Li,Nannan Liu,Dong Wang,Shaopo Wang
This study was to investigate the occurrence, migration and health risk of phthalic acid esters (PAEs) in tap water , barreled water and bottled water in Tianjin, China. Six priority controlled PAEs were measured, among which the detection frequency of butyl benzyl phthalate (BBP), dibutyl phthalate (DBP) and di(2-ethylhexyl) phthalate (DEHP) was 100%, while the others were not detected. The concentration of DEHP was higher than BBP and DBP in all the samples. The initial ∑ 3 PAEs concentrations in tap water, barreled water and bottled water were 2.409 ± 0.391 μg/L, 1.495 ± 0.213 μg/L and 1.963 ± 0.160 μg/L, respectively. Boiling tap water could reduce the PAEs content to an extent, but they increased significantly in hot tap water contacting with disposable plastic cups. The migration of PAEs in barreled water and bottled water were positively correlated with storage time and temperature, which could be described by exponential models. The hazard indexes of PAEs in different types of drinking water were very low. However, the human carcinogenic risks of DEHP will reach the maximum acceptable risk level of 10 −6 when bottled water is stored for 8.8 days at 40 °C, 7.7 days at 50 °C, or 6.1 days at 60 °C.
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高影响因子
FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Xin Ying,Jiaxing Gao,Jing Lu,Changlu Ma,Jiaping Lv,Benu Adhikari,Bo Wang
Soy peptide solution (40%, w/w) was successfully encapsulated in a W 1 /O/W 2 double emulsion produced by a two-step emulsification process. Polyglycerol polyricinoleate (PGPR) was found to be an effective inner emulsifier compared to Span 60 and lecithin to produce stable W 1 /O primary emulsion. The primary emulsion was subsequently emulsified into an outer aqueous phase (W 2 ) containing octenyl succinic anhydride (OSA) starch and maltodextrin. The droplet size and encapsulation efficiency of the peptide solution in W 1 /O/W 2 emulsion were found to depend on the W 1 :O ratio, peptide concentration in the inner W 1 phase and homogenization condition of the secondary emulsification step. The double emulsion with the highest encapsulation efficiency (>80%) was prepared by: (i) using 40% (w/w) soy peptide solution as W 1 phase; (ii) controlling W 1 :O ratio at 3:7 (w/w) and (iii) homogenizing the emulsion at 10,000 rpm for 3 min. The freeze-dried microcapsule powder of W 1 /O/W 2 emulsion showed higher encapsulation efficiency (>70%) compared to spray-dried one. The freeze-dried microcapsule of W 1 /O/W 2 double emulsion developed in this study is a promising delivery matrix to encapsulate hydrophilic ingredients including peptides. Fourier-transform infrared spectroscopy (FTIR) spectra of the microcapsule powder indicated good compatibility between peptide and encapsulants.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 68
·39914-39923
·
IF 3.049
Cheng Qian,Yefei Wang,Zhen Yang,Zhengtian Qu,Mingchen Ding,Wuhua Chen,Zhenpei He
The in situ N2 generation technique is a promising method for enhancing oil recovery (EOR) and blockage removal. Conventionally, N2 is generated through the redox reactions of sodium nitrite (NaNO2) and ammonium chloride (NH4Cl). The effect of several parameters on N2 production was studied in this work. The reaction kinetics between NaNO2 and NH4Cl were developed. The results revealed that the optimal molar ratio was 1 : 1 for the reactants and a higher concentration of reactants, H+ and higher temperature would lead to an increase in the gas production volume and a better gas-generating efficiency. The kinetic equation of the N2 generation reaction was defined as dc/dt = −7.103 × 107 cH+1.3291c02.0949e(−51.28 kJ mol−1)/RT. Methyl formate, ethyl formate, ammonium persulphate as well as paraformaldehyde were selected as authigenic acids by measuring their pH values and their effect on the rate of gas-generation, and the gas production volume was studied. An energy enhancement experiment was conducted to examine the influence of reactant concentration, initial pressure and different authigenic acids on energy enhancement and gas-generating efficiency. The results showed that the increase in reactant concentration can improve the energy enhancement while neither the reactant concentration nor the initial pressure could hardly influence the gas-generating efficiency. The presence of authigenic acids can considerably enhance both the gas production volume and the gas-generating efficiency of the system. The ammonium persulphate assisted N2 generation system is considered to be suitable for field applications.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Tao Zhang,Hongzheng Pu,Hanlu Zeng,Ying Zhou,Xiangnan Gong,Qian Ye,Chuanyao Yang,Dingfeng Yang,Yuanyuan Li
Orbital engineering is an important strategy for modulating light absorption in photocatalysis . Here, Bi doping of the oxide photocatalyst Li 2 SnO 3 to enhance light absorption was rationally designed by orbital engineering. Based on density functional theory, owing to the lower Bi 6s energy level compared with that of Sn 5s, a deep impurity energy level induced by ionic Bi–O bonds is generated in the middle band gap of Li 2 SnO 3 . The impurity energy level can facilitate the utilization efficiency of light absorption, leading to remarkably enhanced photocatalytic performance. For Li 2 Sn 0.9 Bi 0.1 O 3 , the photodegradation rate of tetracycline solution reached 76% within 30 min, which was approximately 2.6 times higher than that for Li 2 SnO 3 . A radical trapping experiment revealed that the holes (h + ) play a dominant role in the elimination reaction . Finally, liquid chromatography–mass spectrometry was performed to monitor the photocatalytic process. This study lays a foundation for rational design of photocatalysts with excellent light absorption for photocatalysis .
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TALANTA
·
2021
·
IF 6.057
Yi Tong,Cheng Guo,Zhengzheng Liu,Keqiang Shi,Haiyan Zhang,Yaqin Liu,Guanlv Wu,Hongru Feng,Yuanjiang Pan
Tris(2,3-dibromopropyl) isocyanurate (TBC) is one of the novel brominated flame retardants that has been widely used in consumer goods. Humans may be exposed to TBC daily. Studies showed that TBC can induce significant toxicity. However, there is currently no report on its in situ localization in organs. In this study, we aimed to develop a reliable and reproductive method to determine the in situ localization of TBC in mouse organs by matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI-IMS). As commercially available matrices were not able to detect TBC in tissue section, we then developed a novel MALDI-IMS method based on 1,5-diaminonaphthalene hydrochloride and silver trifluoromethanesulfonate (NDA/AgOTf) as the matrix for the in situ localization of TBC. AgOTf used as the auxiliary matrix in the negative-ion mode showed an excellent MS signal of TBC. The detection limit of [2AgOTf + Br] - was at the μg/mL level. The developed MALDI-IMS method was successfully employed to obtain the TBC spatial distribution in the mouse organs collected from mice exposed to 160 mg/kg/day of TBC for 30 days. High-pressure liquid chromatography-tandem mass spectroscopy (HPLC-MS/MS) was also used to evaluate the accumulation of TBC in liver, kidney, heart, and brain. The combination of MALDI-IMS and HPLC-MS/MS showed that TBC can accumulate in mice organs and it is mainly distributed in the renal parenchyma. In summary, an innovative method was developed for the analysis of TBC spatial distribution by MALDI-IMS using a novel NDA/AgOTf matrix, extending the application of MALDI-IMS in environmental pollutants .
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PubMed
高影响因子
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