CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ze Fang,Nan Li,Zhiguo Zhao,Zhexin Zhu,Wangyang Lu,Fengtao Chen,Junjie Wang,Wenxing Chen
Developing efficient and environmentally friendly catalytic system is significant for the removal of sulfide in fuel. O-bridged diiron perfluorophthalocyanine/4-mercaptopyridine (FePcF 16 -O-FePcF 16 /4-Mpy) as a novel composite catalyst was designed and prepared by axial coordination. The catalyst characterization was conducted through ultraviolet–visible spectroscopy, fourier transform infrared spectroscopy, X-ray diffractometry, electrospray ionization–mass spectrometry and density-functional theory technology. A high-efficient extraction oxidative desulfurization system is composed of hydrogen peroxide (H 2 O 2 ), the mixture of ethanol and water and FePcF 16 -O-FePcF 16 /4-Mpy. Notably, the coordination of 4-Mpy greatly enhanced the catalytic activity of FePcF 16 -O-FePcF 16 , 99.4% of the desulfurization rate was achieved in 20 min at 30 °C. The catalyst system was cycled 8 times without significantly reducing the removal of dibenzothiophene. Electron paramagnetic resonance and gas chromatography–mass spectroscopy proved the high-valent iron-oxo intermediates were the main active substances in the FePcF 16 -O-FePcF 16 /4-Mpy/H 2 O 2 system, and the pathway of catalytic oxidation DBT was proposed. This work provided useful insights to select suitable ligands to improve the activity of metal phthalocyanine, and offered a novel idea for the construction of efficient oxidative desulfurization system.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 40
·27848-27857
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IF 4.449
Xiaofang Li,Changqian Wang,Bo Li,Yu Shao,Danzhen Li
Efficient light harvesting was observed over CdS photodeposited on In2O3 photonic crystals during the photocatalytic hydrogenation of 4-nitroaniline to p-phenylenediamine. The highest conversion of 4-nitroaniline and selectivity of p-phenylenediamine over the In2O3 photonic crystal supported CdS were ∼93% and ∼99%, respectively, which were better than that achieved for commercial hexagonal CdS. The existence of the photonic crystal structure was responsible for the higher efficiency of In2O3 photonic crystal supported CdS. The ordered structure facilitated the mass transport. The elaborate tuning of the photonic band gap activated the slow photon enhancement effect on the blue edge for intensifying the light harvesting efficiency of CdS. Moreover, CdS supported on In2O3 photonic crystals exhibited higher photocatalytic stability than that on the In2O3 nanocrystals. The mechanism of photocatalytic hydrogenation over In2O3 photonic crystal supported CdS was discussed. Our results provided guidance for efficiently utilizing light for photocatalysis by applying photonic crystals as support.
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Chemical Science
·
2023
·Vol. 15
·期 3
·1018-1026
·
IF 8.4
Zi-Sheng Li,Wei-Xing Chen,Harry W. T. Morgan,Cong-Cong Shu,John E. McGrady,Zhong-Ming Sun
The endohedral Zintl-ion cluster [Fe3Sn18]4− contains a linear Fe3 core with short Fe–Fe bond lengths of 2.4300(9) Å. The ground state is a septet, with significant σ and π contributions to the Fe–Fe bonds. The Sn18 cage is made up of two partially fused Sn9 fragments, and is structurally intermediate between [Ni2CdSn18]6−, where the fragments are clearly separated and [Pd2Sn18]4−, where they are completely fused. It therefore represents an intermediate stage in cluster growth. Analysis of the electronic structure suggests that the presence of the linear Fe–Fe–Fe unit is an important factor in directing reactions towards fusion of the two Sn9 units rather than the alternative of oligomerization via exo bond formation.
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LANGMUIR
·
2023
·
IF 3.9
Jingyun Ye,Chenhui Li,Xiaoqiu Yao,Ming Jin,Decheng Wan
We here show that a dendritic molecule combined with ligand merit confers supported platinum nanoclusters (PtNCs) with unprecedented catalytic performance. Branched polyethylenimine (PEI, Mn = 2000 D) patched on a porous bead is modified with 2-(diphenylphosphino)benzaldehyde (dppb) before being used to mediate a platinum nanoparticle/nanocluster (Pt0). The catalytic activity of Pt0 toward the reduction of 4-nitrophenol (4-NP) is evaluated from the parameter of Pt-normalized rate constant (kc). Optimization of the dppb level along with transformation of the PEI hydrogens into diol or trimethylammonium groups imparts supported Pt0 unprecedented activity (kc = 19.2 L mmol–1 s–1 and turnover frequency (TOF) = 1041 h–1). The supported Pt0 at an extremely low dosage of 0.1 ppm promotes 98% conversion of 4-NP within minutes and is well recyclable. The striking catalytic activity is attributed to the combination of orthogonal ligand properties such as weak ligand nature, catalyst-activating ability, excellent substrate affinity, and effect on PtNC-size mediation of the ligand.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Yuwei Duan,Jungang Wang,Dongfang Xu,Peigen Ji,Hui Zhou,Yong Li,Shaoming Yang,Zhuang Xie,Xiaohu Hai,Xuruo Lei,Rui Sun,Zihao Fan,Ke Zhang,Shengzhong Liu,Zhike Liu
To simultaneously stabilize cesium lead triiodide (CsPbI 3 ) precursor solution and passivate the defects in CsPbI 3 film is greatly significant for achieving highly stable and efficient CsPbI 3 perovskite solar cells (PSCs). Herein, an effective redox 4-fluorobenzothiohydrazide (FBTH) is developed to stabilize the precursor solution and passivate iodine/lead-related defects for high-quality CsPbI 3 film. The comprehensive research confirms that 1) a new compound FBTH-I is obtained from an effective redox interaction between FBTH and molecular iodine (I 2 ) in perovskite precursor solution, which can effectively impede the formation of I 2 molecule and restrain I − migration in perovskite film by forming N–H···I bond; 2) FBTH-I can also passivate Pb-related defects via forming S···Pb interaction. Consequently, the CsPbI 3 PSC based on FBTH-treated precursor solution exhibits a fascinating power conversion efficiency (PCE) of 21.41%, which is one of the highest PCE values among the reported pure CsPbI 3 PSCs so far, and an outstanding stability against the harsh conditions, such as thermal annealing and continuous light-illumination.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Mengyuan Liu,Jing Li,Jiali Li,Bingsheng Zhou,Paul K.S. Lam,Chenyan Hu,Lianguo Chen
The application of 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) as an antifouling biocide causes high toxicity to non-target marine organisms. To examine the developmental cardiotoxicity and mechanisms of DCOIT, we concurrently performed sub-chronic exposure and life-cycle exposure experiments using marine medaka embryos. After sub-chronic exposure to DCOIT at 1, 3, 10, and 33 μg/L, cardiac defects were caused by upregulation of cardiac gene transcriptions, decreasing heart size, and accelerating heartbeat. Hyperthyroidism in medaka larvae was identified as the cause of developmental cardiotoxicity of DCOIT sub-chronic exposure. In addition, parental life-cycle exposure to 1, 3, and 10 μg/L DCOIT led to transgenerational impairment of cardiogenesis in offspring medaka. A crossbreeding strategy discriminated a concentration-dependent mechanism of transgenerational cardiotoxicity. At 1 μg/L, the DCOIT-exposed female parent transferred a significantly higher amount of triiodothyronine (T3) hormone to offspring, corresponding to an accelerated heart rate. However, DCOIT at higher exposure concentrations modified the methylome imprinting in larval offspring, which was associated with cardiac dysfunction. Overall, the findings provide novel insights into the developmental cardiotoxicity of DCOIT. The high risks of DCOIT—even at environmentally realistic concentrations—raise concerns about its applicability as an antifoulant in a marine environment.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Zezhou Lin,Tianyu Li,Qian Yu,Haiyun Chen,Di Zhou,Ning Li,Chunyan Yan
Achyranthes bidentata is a species of flowering plant that is mainly distributed in China. The A. bidentata rhizome is a famous traditional Chinese medicine that has been widely used to treat lumbago, arthritis, and bone hyperplasia. In this work, A. bidentata rhizome was isolated and purified to obtain a pectic polysaccharide (ABPB-4). Chemical and spectral analyses showed that ABPB-4 had a main chain of →4)- α - d -Gal p A-(1→ and →2,4)- α - l -Rha p -(1→, and the branch chains included →4)- β - d -Gal p -(1→, →6)- β - d -Gal p -(1→, →3,6)- β - d -Gal p -(1→, →5)- α - l -Ara f -(1→ and →3,5)- α - l -Ara f -(1→, and it was terminated with α - l -Ara f -(1→ and β - d -Gal p -(1→. At concentrations of 0.01, 0.02, and 0.04 μmol/L, ABPB-4 significantly promotes the proliferation, differentiation, and mineralization of MC3T3-E1 cells in vitro , and it appreciably enhances the mRNA expression levels of osteogenic-related genes in these cells. Overall, the results reported herein indicate that ABPB-4 has outstanding osteogenic activity, and that it may be used as an anti-osteoporosis agent in the future.
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PLoS One
·
2021
·Vol. 16
·期 4
·e0249915
·
IF 3.24
Jing Han,Ze-Tian Qin,Jing Zhang,Wen-Qiang Wang,Jing-Ya Wu,Yong-Ze Lu,Li-Wei Sun
Ultraviolet (UV) filters are used in cosmetics, personal care products and packaging materials to provide sun protection for human skin and other substances. Little is known about these substances, but they continue to be released into the environment. The acute toxicity of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC to Chlorella vulgaris and Daphnia magna were analyzed in this study. The 96 h-EC 50 values of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC on C . vulgaris were 183.60, 3.50 and 0.16874 mg/L, respectively. The 48 h-LC 50 of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC on D . magna were 12.50, 3.74 and 0.54445 mg/L, respectively. The toxicity of a mixture of 4,4’-dihydroxybenzophenone and 4-MBC showed addictive effect on C . vulgaris , while the toxicity of mixtures of 4,4’-dihydroxybenzophenone and 2,4,4’-trihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC as well as 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC all showed antagonistic effect on C . vulgaris . The induced no-effect concentrations of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC by the assessment factor (AF) method were 0.0125, 0.00350 and 0.000169 mg/L, respectively.
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CHEMOSPHERE
·
2021
·
IF 7.086
Yi Sun,Qingxiang Zhou,Xueying Sheng,Shuanying Li,Yayan Tong,Jinghan Guo,Boyao Zhou,Jingyi Zhao,Menghua Liu,Zhi Li,Yanhui Li,Tongxu Qu,Chunmao Chen
4-Carboxyphenylboronic acid was used as the single precursor to facilely prepare fluorescent carbon quantum dots by one-step solvothermal method. The as-obtained carbon dots (CDs) exhibited highly selective and sensitive for benzo[a]pyrene (BaP), and may be a splendid sensor for sensing BaP. The principle was that the as-prepared CDs could form a complex with BaP through hydrophobic interaction which causes the decrease of fluorescence intensity of CDs by static quenching principle. The constructed fluorescent sensor exhibited excellent linearity ranged from 0.002 to 0.06 μg mL −1 and provided a low limit of detection of 0.16 ng mL −1 . The experimental results showed that this fluorescent sensor resulted in simplicity, rapidness, low cost, short analytical time, and high sensitivity and stability. Validation with real water samples endowed the sensor high reliability and feasibility for BaP determination in practical application in various samples.
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LUMINESCENCE
·
2021
·Vol. 37
·期 1
·72-81
·
IF 2.464
Haonan Zhao,Junfeng Zhang,Xiaolian Lin,Huihui Li,Qinhe Pan
Cr(VI) is a type of dangerous effluent that has caused great harm to human health and the environment. Recognition and perception of Cr(VI) by artificial receptors has attracted extensive attention. A novel fluorescent chemical sensor based on the 5,7-dihydroxyflavone skeleton was designed and synthesized for the selective recognition of Cr(VI). As confirmed by fluorescence technology, the fluorescent probe 4-dimethylaminobenzyl chrysin ester–Zn (DBC–Zn) showed high sensitivity and selectivity for dichromate and a fast response (less than 30 sec) recognition. The fluorescence intensity of DBC–Zn varies linearly with the concentration of Cr(VI) in the range 0.1–1 μM. The detection limit of Cr 2 O 7 2− by DBC–Zn is 2.3 nM, which is far lower than the national safe drinking water standard stipulated by the US Environmental Protection Agency (1.9 μM). The quenching mechanism of the probe can be attributed to the interaction of the dynamic quenching effect and the fluorescence internal filtration effect. In addition, the probe has good stability in both neutral and alkaline environments, and the accuracy of quantitative analysis of Cr 2 O 7 2− in lake water or tap water is more than 80%. The test paper based on DBC–Zn can effectively detect Cr 2 O 7 2− at the concentration of 100 ppb. This shows that the probe has a certain practical application value.
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VACUUM
·
2021
·
IF 3.627
Hua Fang,Xueyong Guo,Wei Wang,Jianxin Nie,Kehua Han,Chengcheng Wu,Shuji Wang,Di Wang,Peng Deng
The application of nano-catalytic materials in molecular perovskite energetic materials is of great significance to promote the development of molecular perovskite energetic materials in explosive formulations and propellants. In this paper, the thermal catalytic effects of CoFe-layered double hydroxide derivative on the molecular perovskite energetic material (DAP-4) were studied. In this study, we successfully prepared a new type of CoFe-based photothermal agent (CoFe-500) by heating CoFe layered double hydroxide nanosheets in an Ar atmosphere at 500 °C. And the micromorphology, structure composition , thermal decomposition performances of CoFe-500 and DAP-4/CoFe-500 composite were characterized. The experimental results showed that with the addition of CoFe-500, the initial decomposition temperature and peak exothermic temperature of DAP-4 showed a decreasing trend. With 10 wt% CoFe-500 added, the initial decomposition temperature and peak exothermic temperature of DAP-4 decreased from 305.6 °C to 166.3 °C and 379.0 °C–322.5 °C, respectively (10 °C/min heating rate). The apparent activation energy ( E a ) of pure DAP-4 is 172.27 kJ/mol and 175.13 kJ/mol calculated by the Kissinger and Ozawa method, respectively. And with 10 wt% CoFe-500 added, the E a is reduced to 119.11 kJ/mol and 122.84 kJ/mol, respectively. The possible thermal catalytic decomposition mechanism of DAP-4/CoFe-500 composites was proposed from the thermal analysis and mass spectrometry test results. This work is meaningful to further understand the decomposition performances of DAP-4 in the presence of nano-layered double hydroxide.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Lvxia Zhang,Hui Ouyang,Dan Zhang,Zhifeng Fu
Novel cobalt-based metal-organic frameworks (Co MOFs) were synthesized by a facile “controlled synthesis” strategy. The MOFs displayed superior catalytic performance on the chemiluminescent (CL) reaction between N -(4-aminobutyl)- N -ethylisoluminol (ABEI) and H 2 O 2 . UV–vis absorption, CL spectrum, ESR, and radical scavenger experiments were conducted for clarifying the catalytic mechanism of Co MOFs. All results revealed that Co MOFs can accelerate decomposition of H 2 O 2 and production of OH • , O 2 • − as well as 1 O 2 radicals. The rapid reaction between these reactive oxygen species and ABEI resulted in the generation of ABEI-ox∗. The excited-state oxidation product emitted a very intensive CL signal with a maximal emission wavelength of 430 nm as it returned to the ground state. To explore their application potential in CL assay, Co MOFs were used as powerful CL reaction catalyst for establishing a very sensitive method for immunoassay of aflatoxin B 1 . The detection range was 0.05–60 ng mL −1 , and the limit of detection was 4.3 pg mL −1 . The result for detecting herbal medicine samples demonstrates the acceptable reliability of the Co MOFs-based CL immunoassay. The proof-of-principle work verifies the application potential of Co MOFs on boosting intensive CL signal, and meets the demand for high sensitivity in various bioassay fields.
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