INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Zhu Ren,Shuo Chen,Shun-Feng Jiang,Wei-Fei Hu,Hong Jiang
In this study, a solar/chlorine/graphitic carbon nitride (g-C3N4) system for the highly efficient degradation of carbamazepine (CBZ) was constructed, and the degradation mechanism of CBZ in this system was elucidated. The removal rate of CBZ by g-C3N4 combined with solar/chlorine was as high as 97.8%, which was more than twice that of the solar/chlorine combined system (43.8%). Electron spin resonance analysis revealed that the hydroxyl radicals (HO•) in the solar/chlorine/g-C3N4 system were remarkably less than that in the solar/chlorine photocatalytic system, wherein HO• was the dominant participant. However, the former system had higher efficiency than the latter. Scavenging tests confirmed the existence of a synergistic effect between solar/chlorine and g-C3N4 in CBZ degradation, and ground-state atomic oxygen (O(3P)) played a more important role than HO• in the solar/chlorine/g-C3N4 system. A novel O3-related pathway of CBZ degradation was proposed on the basis of the determination of intermediates. The intermediates detected via liquid chromatography quadrupole time of flight mass spectrometry (LC/Q-TOF-MS)/MS analysis indicated that O3 attacked the double bond of CBZ via the Criegee mechanism and produced intermediates with two new aldehydes. This study not only improved the knowledge of the effects of O(3P) and the O(3P)-related degradation mechanism of organic pollutants but also provided a reminder that O(3P) might be overlooked in the photocatalytic processes, especially in processes that occur in the presence of dissolved oxygen or oxygen-containing anions.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2019
·
IF 2.961
Leipeng Li,Feng Qin,Lu Li,Hong Gao,Qin Deng,Zhiguo Zhang
Here a strategy was proposed to realize the thermal enhancement of the green luminescence of Tb 3+ ion through ground state thermal population. The 5 D 4 - 7 F 5 emission line of Tb 3+ ion was observed under the excitation of a commonly used 405 nm laser diode for the first time, to the best of our knowledge. Its intensity was found to increase by ten times upon increasing the temperature from 343 to 783 K. Moreover, this change law was in good accordance with the Boltzmann distribution . It was confirmed that the thermal population of the 7 F 5 state at the expense of the depopulation of the 7 F 6 ground state, namely the ground state thermal equilibrium, should be responsible for this uncommon phenomenon. For comparison, the Xe lamp was also used to directly excite the 7 F 6 - 5 D 3 absorption line of Tb 3+ ion. In this case, the 5 D 4 - 7 F 5 emission line of Tb 3+ ion was also observed. Different from the former case, this line decreased monotonously upon increasing the temperature over the experimental range. The reason for this change law was also discussed.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 2
·477-485
·
IF 8.273
Li Hao,Li Yaoxin,Lian Yukun,Xie Weiwei,Chen Ling,Zhang Jinsong,Wu Yang,Fan Shoushan
As a sister compound of MnBi 2 Te 4 , the high-quality MnSb 2 Te 4 single crystals are grown via solid-state reaction where prolonged annealing and narrow temperature window play critical roles on account of its thermal metastability. Single-crystal X-ray diffraction (SCXRD) analysis on MnSb 2 Te 4 illustrates a crystal model that is isostructural to MnBi 2 Te 4 , consisting of Te-Sb-Te-Mn-Te-Sb-Te septuple layers (SLs) stacking in an ABC sequence. However, MnSb 2 Te 4 reveals a more pronounced cation intermixing in comparison with MnBi 2 Te 4 , comprising 28.9(7)% Sb antisite defects on the Mn (3a) site and 19.3(6)% Mn antisite defects on the Sb (6c) site, which may give rise to novel magnetic properties in emerging layered MnBi 2 Te 4 -family materials. Unlike the antiferromagnetic (AFM) nature in MnBi 2 Te 4 , MnSb 2 Te 4 exhibits a glassy magnetic ground state below 24 K and can be easily tuned to a ferromagnetic state under a weak applied magnetic field. Its magnetic hysteresis, anisotropy, and relaxation process are investigated in detail via static and dynamic magnetization measurements. Moreover, anomalous Hall effect as a p-type conductor is demonstrated with transport measurements. This work grants MnSb 2 Te 4 a possible access to the future exploration of exotic quantum physics by removing the odd/even layer number restraint in realizing quantum transport phenomena in intrinsic AFM MnBi 2 Te 4 -family materials, as a result of the crossover between its magnetism and potential topology arising from the Sb-Te layer.
研究领域:
凝聚态物理
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材料科学
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磁学
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量子输运
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晶体化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Haipeng Jiang,Chunyu Wei,Jin Wang,He Dong,Xinmin Fu,Le Zhang,Fengyou Wang,Lin Fan,Maobin Wei,Huilian Liu,Lili Yang,Yongsheng Yan
Intramolecular hydrogen bonding (H-bonding) involved in the excited-state proton transfer (ESPT) process results in benzophenone derivatives (BPDs) with an excellent ability to passivate defects. However, the BPDs are in a continuing dynamic transition process between the ground state and the excited state under light radiation conditions. The ground-state BPDs may lose their ability to passivate defects, resulting in an increased defect density of the perovskite. Therefore, enhancing the passivation ability of the ground-state BPDs can help to achieve the full passivation ability of their ground state to excited state. Herein, we have researched the various BPDs by density functional theory and found that intramolecular H-bonding can weaken the passivation ability of ground-state BPDs, but intramolecular H-bonding is indispensable in the ESPT process. To address the issue, we investigated the influence of electron-donor properties and dipole moments of hydroxyl (−OH), methoxy (−OCH3), and n-octyloxy (−OC8H17) groups in BPD molecules on their coordination capacity through molecular design engineering. Ultimately, 2-hydroxy-4-n-octyloxy-benzophenone (UV5) with strong electron-donor n-octyloxy (−OC8H17) and elongated carbon-chain structure was selected as an additive, which enhances the passivate defect capability in both the ground and excited states. As a result, the UV5-based champion device achieved a power conversion efficiency (PCE) of 24.46% and remained at 75% of the initial PCE with exposure to UV light. This work focuses on the defect passivation capability of ground-state BPDs for the first time and opens a new concept for applying BPDs in PSCs.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Hui Li,Shuang Li,Yanhong Wang,Yaling Dou,Hongcheng Lu
We prepared a layered antiferromagnet KNiB 4 O 6 F 3 1 by hydrothermal synthesis, and characterized its structure and physical properties by X-ray diffraction, magnetization and specific heat measurements as well as thermal stability, FTIR and UV–vis–NIR measurements. 1 consists of layers of composition [NiB 4 O 6 F 3 ] - separated by layers of K + cations. And Ni 2+ ions are arranged in slightly distorted triangular pattern in each [NiB 4 O 6 F 3 ] - layer. The magnetic susceptibility measurements indicate no divergence between the zero-field-cooled and field-cooled curves down to 7.9 K, below which a long-range order takes place as verified by specific heat measurements. The M ( H ) curve linearly increases when the field is weak (below ∼2 T), confirming that the ground state of 1 is antiferromagnetic. At 7 T, the magnetization of 1 is 1.67 μ B which is lower than the saturation magnetization.
研究领域:
材料科学
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固体物理
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无机化学
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磁学
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晶体学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 10
·4756-4761
·
IF 3.925
Liping Lin,Qiaoling Zheng,Qiushuang Chen,Meng Fang,Qingjiao Lai,Xinghao He,Jinying Qin,Zu-jin Lin,Rongguang Lin
Fluorescent polydopamine nanoparticles (PDA NPs) have been effectively synthesized by means of self-polymerization of dopamine under the strong alkaline condition of ethylenediamine at room temperature for 2.5 h. The obtained PDA NPs displayed excellent optical properties under the conditions of high ion strength and wide pH range. Utilizing the fluorescent signal of PDA NPs, a fluorescence turn-off sensor for tartrazine detection is proposed. The fluorescence signal changes linearly depending on the tartrazine concentration range of 1.5–45 μM, and a detection limit of 0.55 μM was obtained. The mechanism studies showed that the fluorescence quenching procedure is ascribed to the combined effects of the inner filter and the generation of non-fluorescent ground state complexes between PDA NPs and tartrazine via strong electrostatic interactions. The satisfactory results of the proposed sensor when applied to tartrazine detection in soft drinks and candies promise its practicality for real food samples.
研究领域:
分析化学
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纳米技术
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食品科学
✓ 已验证
DOI
高影响因子
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