Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·20760-20768
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IF 9.931
Xiaoqin Sun,Fangfang Wu,Gang Liu,Xiaoxiang Xu
The perovskite oxynitride SrTaO2N is a promising compound for solar energy conversion because it has strong visible light absorption at wavelengths as long as 650 nm. However, its photocatalytic activity is generally very poor, primarily because of the high defect concentration induced during its synthetic procedures as well as photocatalytic self-decomposition events. In this work, we introduce Sr into the B site of SrTaO2N to form a complex perovskite oxynitride, Sr3(Sr1/3Ta2/3)3O9−xNy (i.e. Sr4Ta2O9−xNy). The new compound has a much lower defect concentration compared to SrTaO2N and much higher stability against photocatalytic self-decomposition. More importantly, Sr4Ta2O9−xNy demonstrates significantly improved photocatalytic activity for water oxidation and reduction reactions under visible light irradiation (λ ≥ 400 nm) than SrTaO2N, approaching an apparent quantum efficiency as high as 3.4% at 420 ± 20 nm.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Kaiwei Dong,Feng Xie,Yongfeng Chang,Chunlin Chen,Wei Wang,Diankun Lu,Xiaowei Gu
Toxic sodium cyanate is always present in cyanide-contaminated waste. A new technology for the efficient decomposition of toxic sodium cyanate by hematite was first proposed in this study. The decomposition of sodium cyanate under various atmospheres has been studied. Studies show that sodium cyanate decomposes above 782 °C in Ar and above 627 °C in air. Sodium cyanate does not decompose even roasted at 400 °C for 120 min in air. Hematite does not promote the decomposition of sodium cyanate in Ar. However, almost all sodium cyanate decomposes efficiently at 400 °C and the mass ration of hematite to sodium cyanate of 1:1 for 30 min in air or oxygen atmosphere. The increased mass ratio of hematite to sodium cyanate and roasting temperature can both favor the efficient decomposition of sodium cyanate. The efficient decomposition of sodium cyanate occurs within 30 min, and it is almost stagnant with the prolongation of roasting time. When roasted in air or oxygen in the presence of hematite, sodium cyanate decomposes to Na 2 CO 3 , CO 2 and N 2 and a small amount of NaNO 3 and NO x . The optimal efficient decomposition of sodium cyanate is to roast above 400 °C for 30 min in air or O 2 at a mass ration of hematite to sodium cyanate greater than 1:1.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 46
·28797-28801
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IF 3.108
W. X. Liao,X. L. Zhao,T. S. Wang
The relatively wide band gap (>2.0 eV) and limited light absorption ranges (only up to 600 nm) of photocatalysts severely restrict the exploitation of solar energy. Herein, we developed a Bi7.38Cr0.62O12+x crystal photocatalyst with a narrow band gap of 1.98 eV and a broad light absorption range of ∼650 nm. Unlike other broad light absorption range photocatalysts (up to ∼650 nm) such as red phosphorus, Fe2O3, and CdSe, which are either unstable or show low photocatalytic performances, the as-synthesized Bi7.38Cr0.62O12+x crystal photocatalyst exhibits a steady photocatalytic activity for the decomposition of methylene blue, methyl blue, and phenol, and production of O2.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·Vol. 149
·期 24
·14715-14725
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IF 3
Chen Peng,Chen Liping,Zhou Juan,Wu Wenqian,Guo Zichao,Chen Wanghua
Thermal analysis and calorimetry techniques with sealed sample cells are frequently employed to investigate the thermal stability of hazardous materials. However, the influence of sample mass on thermal decomposition is often ignored. To investigate the effect of sample mass on autocatalytic decomposition substances under sealed condition, 2,4-DNT was chosen for test and analysis. The techniques including differential scanning calorimetry (DSC), rapid screening calorimetry(RSC), high-performance liquid chromatography-mass spectrometry (HPLC–MS), and gas chromatography-mass spectrometry (GC–MS) were utilized for in-depth research on the decomposition of 2,4-DNT. The results revealed that an increase in sample mass led to an significant elevation in gaseous products such as CO 2 and CO with a negative heat of formation (ΔH f ). Then the system pressure and decomposition heat of 2,4-DNT increase significantly, thereby enhancing the thermal decomposition process. After that, it has been determined that o–nitrotoluene, m–nitroaniline, and o–nitrobenzoic acid can catalyze the decomposition of 2,4-DNT. Finally, it is advisable to increase the sample mass as much as possible when testing and analyzing such nitro compounds which would help ensure that the predicted results are closer to the actual conditions of production, transport, storage.
研究领域:
化学工程
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材料科学
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安全科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2018
·
IF 5.089
Xiaojun Fu,Wusigale,Hao Cheng,Zheng Fang,Li Liang
Proteins have been widely used to prepare effective carriers for the protection of bioactive components. There were rare studies on proteins' change during protection and its impact on the protection, albeit they are important for the choosing of suitable proteins used as carrier materials. Folic acid is a synthetic form of folate but decomposes under ultraviolet irradiation. In this study, improved protection of whey protein isolate (WPI) against the photodecomposition of folic acid was investigated by using fluorescence and HPLC. During the vitamin decomposition, WPI's change was characterized in term of composition, structure, interaction with the vitamin or its decomposition products. Folic acid decomposition photosensitized indirect oxidation of WPI, leading to unfolding, degradation in concurrence with oligomerization . The increase in the absorbance and antioxidant activity contributed to the protein improved protection for folic acid. WPI could thus be a good carrier material for the encapsulation and protection of folic acid.
研究领域:
食品科学
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营养学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Yuhuan Bu,Zilong Lu,Chang Lu,Huajie Liu,Shenglai Guo,Hexing Liu,Rui Ma,Zhen Zhang,Mengran Xu
Deepwater cementing technology holds non-negligible significance in ensuring the safe exploitation of deepwater oil and gas resources, and maintaining stability of hydrate formations is crucial for deepwater cementing. Traditional solutions primarily focus on reducing the cement’s hydration heat evolution but fail to effectively address the issue of hydrate dissociation. Therefore, our previous work outlined the design and optimization of a novel hydrate dissociation inhibitor, PVCap/dmapma, and its physical synthesis and evaluation are explored in this study. The method of molecular simulation and experimental study was utilized to establish an evaluation method of hydrate dissociation inhibitor under cementing environment, to investigate the hydrate decomposition inhibitory, and to determine the relatively optimal synthesis conditions and process. PVCap/dmapma exhibits excellent ability to delay the hydrate dissociation, and no adverse effects on cement thickening and mechanical properties compared to Lecithin. Our findings provide a certain theoretical foundation for the development of hydrate dissociation inhibitors for cementing and hold significant implications for ensuring the safe exploitation of deepwater oil and gas resources.
研究领域:
石油工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2017
·
IF 3.086
Wusigale,Zheng Fang,Lyulin Hu,Yahui Gao,Juan Li,Li Liang
Folic acid is a synthetic form of the B-group vitamin known as folate and essential for a variety of physiological processes. However, it decomposes under UV irradiation, causing indirect oxidation and structural change of protein. In this study, the protective effect of resveratrol against the photodecomposition of folic acid and its caused protein structural change was investigated by using fluorescence and absorbance spectroscopy, high performance liquid chromatography and ABTS assay . It was found that resveratrol could inhibit the folic acid decomposition and control the decomposition process, depending on the polyphenol concentration and addition time. Transformation of resveratrol was accelerated by photodecomposition of folic acid. Antioxidant activity of resveratrol was important for the protective effect. Moreover, resveratrol could also inhibit the unfolding of beta-lactoglobulin caused by the folic acid decomposition by using circular dichroism .
研究领域:
营养学
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食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2018
·
IF 2.067
Yinghui Hu,Shimin Yang,Bowen Tao,Xiaolong Liu,Kaifeng Lin,Yulin Yang,Ruiqing Fan,Debin Xia,Dongyu Hao
Hollow mesoporous CuO microspheres (CuO-HM) have been prepared by a hard-template method and their structure properties as well as catalytic performance in ammonium perchlorate (AP) decomposition were fully investigated by XRD , SEM , XPS , TG/DSC and TG/F-TIR methods. The results indicated that CuO-HM could be described as CuO micro-sized spheres composed of self-assembled nanoparticles , possessing hollow and mesoporous structure. Compared with CuO nanoparticles and CuO microspheres, CuO-HM has significantly improved catalytic efficiency in AP decomposition due to large surface area, easily accessible porous and hollow structure. Typically, CuO-HM could decrease the AP decomposition temperature by 105.7 °C and enhance the heat production by 735 J/g. TG/FT-IR results indicated that CuO-HM accelerated the thermal decomposition of AP mainly at the high temperature decomposition stage with the releasing of N 2 O, NO, NH 3 , H 2 O, HCl, O 2 et al. This study demonstrated that hollow and mesoporous CuO was a promising catalyst for the application in solid fuel rockets propellants .
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2023
·Vol. 148
·期 13
·6013-6026
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IF 4.4
Hu Yinghui,Wang Xuwen,Hao Jingwei,Jiang Shouhang,Zhang Jian,Yang Yulin,Lin Kaifeng,Zheng Jian,Shuai Yong
The excellent thermal decomposition efficiency of ammonium perchlorate (AP) is of great importance for obtaining propellant with fast specific impulse. In this study, four CuM x O y catalysts, including M = Fe, Ni, Co, and Zn, were synthesized and then used for catalyzing AP decomposition and hydroxyl-terminated polybutadiene (HTPB)-based solid propellant combustion. The existed synergistic effect in CuM x O y catalysts improved the catalytic activity and the most active CuZnO catalyst decreased the AP high-temperature decomposition temperature (HTD) from 412.5 to 289.4 °C. Kinetic studies indicated that CuM x O y catalysts inhibited the conversion of N 2 O to a fully oxidized product and decreased the activation energy ( E a ) in HTD to concentrate AP decomposition to significantly decrease the heat loss, thereby increasing their decomposition efficiency. When applying the CuM x O y catalysts in the HTPB (hydroxyl-terminated polybutadiene)-based solid propellant, a faster burning rate and stronger optical emission spectrum were obtained. The CuM x O y catalyst is a potential additive for the preparation of outstanding combustion solid propellants. Graphical abstract
研究领域:
材料科学
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推进剂化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2021
·
IF 6.158
Huanhuan Chen,Liping Chen,Wenqian Wu,Zichao Guo,Xiaoqiao Zhao,Wanghua Chen
Pressure and temperature play an important role in the adiabatic decomposition of hazardous materials. In this article, Accelerating Rate Calorimeter (ARC) was used to study adiabatic decomposition of 40 wt% dicumyl peroxide (DCP) solution，20 wt% di-tert-butyl peroxide (DTBP) solution and 2,4-dinitrotoluene (2,4-DNT). Based on the temperature and pressure signals, the kinetic constants of 40 wt% DCP and20 wt% DTBP were calculated separately. It is found that the temperature and gas production kinetics of the 40 wt% DCP solution are in good agreement with each other, but the temperature and gas production kinetics of 20 wt% DTBP solution are significantly different. The adiabatic decomposition of 2,4-DNT under different pressure conditions was experimentally investigated. The experimental results indicated that pressure promoted the adiabatic decomposition of 2,4-DNT. Accordingly, new kinetic equations were developed to describe the adiabatic decomposition of 2,4-DNT under different pressure conditions. These works provide a new insight into adiabatic kinetics calculations .
研究领域:
化学工程
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安全科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Han-Ming Zhang,Lihao Zuo,Yuhang Gao,Junxia Guo,Caizhen Zhu,Jian Xu,Jinfeng Sun
Designing and synthesizing cost-effective bifunctional catalysts for overall alkaline water/seawater splitting is still a huge challenge for hydrogen production. Herein, Co/Ni/Fe/Mn based-amorphous high-entropy phosphoxide self-standing electrode (CNFMPO) is synthesized by the facile and fast electrodeposition method. CNFMPO exhibits excellent bifunctional electrocatalytic performances on alkaline water/seawater electrolysis. The hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of CNFMPO in alkaline water/seawater are as low as 43/73 and 252/282 mV to reach a current density of 10 mA cm −2 , respectively. Additionally, two-electrode electrolyzers with CNFMPO||CNFMPO successfully achieve the current density of 10 mA cm −2 at low voltages of 1.54 and 1.56 V for overall alkaline water/seawater splitting, respectively. CNFMPO exhibits satisfactory long-term stability on overall alkaline water/seawater splitting for the surface reconstruction into active metal hydroxide/(oxy)hydroxide, phosphite, and phosphate. Moreover, no hypochlorite is detected during seawater electrolysis for the beneficial chlorite oxidation inhibition of the reconstructed phosphite and phosphate. The excellent catalytic performances of CNFMPO are due to the unique amorphous structure, multi-component synergistic effect, beneficial electronic structure modulation, and surface reconstruction during the catalytic reaction process. Therefore, CNFMPO has shown potential promotion to the development of the water/seawater splitting industry as a promising substituent for noble-metal electrocatalysts. This work provides new insights into the design of efficient bifunctional catalysts for overall water/seawater splitting.
研究领域:
材料科学
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能源化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jingjing Du,Tianying Tao,Mengxi Gao,Xueting Zhang,Junjie Zhang,Maosen Wang,Xun Zhou,Yangyi Qin,Peizhi Ji,Xiaole Hu,Tianyao Cheng
The potential threat of nanoplastics on the heterotrophic decomposition of leaf litter lies in their impact on microbial activity and community structure in streams. Therefore, it is crucial to understand the interactions between benthic algae and microbial decomposers when assessing the functioning of stream ecosystems. However, the potential influence of benthic algae on the response of heterotrophic decomposers to nanoplastics remains unknown. This study investigated the interactions between benthic algae and heterotrophic microbial decomposers in the presence of polystyrene nanoparticles (PS-NPs), focusing on their role in leaf litter decomposition and nutrient cycling. The microcosm experiment demonstrated a negative priming effect of benthic algae on leaf decomposition in the absence of PS-NPs. In contrast, the algae-mediated negative priming effect was significantly intensified under PS-NP exposures, decreasing the decomposition rate by 21.3 %. During the various ecological processes, PS-NP exposures significantly reduced the algal biomass and dissolved organic carbon, which in turn disrupted the transfer of labile carbon from benthic algae to heterotrophic microbial decomposers and consequently impeding leaf decomposition process. Additionally, the synergistic effect of benthic algae and PS-NPs decreased the fungal diversity and undermined the dominance of functional genera (i.e., Setophaeosphaeria and Tetracladium ) within the microbial decomposer community. In summary, this study offers innovative insights into the interactions among microbial communities colonizing streambed substrates under plastic pollution, highlighting the ecological implications of nanoplastic detrimental influences on aquatic ecosystems.
研究领域:
生态学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
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