COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Xiaowen Liu,Yuanyuan Liu,Xin Zhang,Xiaodan Miao
In recent years, the development of low-cost and reusable green catalysts to reduce the organic pollutant of 4-nitrophenol (4-NP) into the utilizable intermediate of 4-aminophenol (4-AP) had attracted more and more attention. Herein, we reported a facile strategy to synthesize 3D N-doped graphene/bismuth (NGR/Bi) composites with efficient catalytic properties for 4-NP reduction. TGA exhibited NGR/8Bi catalyst came close to reach the maximum load of Bi (weight ratio 67%). NGR/8Bi catalyst had an apparent rate constant of 0.595 min −1 . After 8 min of catalytic reaction , the conversion of 4-NP reached 99.15%. Doped N facilitated the uniform distribution of Bi on graphene and improved the specific surface area and porosity of the catalyst, all of which contributed to the improvement of catalytic performance. The good reusability was attributed to that the microstructure of catalyst had not been changed significantly after used. The 3D network similar to aerogel made NGR/8Bi very easy to recycle and reuse. EPR spectra showed that H* active free radical was responsible for the conversion of 4-NP. This work revealed that the total surface area of metal particles in metal catalyst composites could affect catalytic performance essentially due to the surface plasma resonance effect.
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Catalysts
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2021
·Vol. 11
·期 12
·1471
·
IF 4.146
Zhenzhen Li,Wei Liu,Guolong Yang
Synthesized oleic acid-based wax esters (e.g., cetyl oleate), which can replace spermaceti oil or jojoba oil, have been widely used in the cosmetic, pharmaceutical and other industries. In this work, 4-dodecylbenzenesulfonic acid (DBSA) has been successfully used as an efficient catalyst to synthesize oleic acid-based wax esters through esterification at 40 °C under solvent-free conditions. A 93.6% conversion rate of cetyl alcohol was obtained under optimal conditions: 10 mol% DBSA, a molar ratio of 1.3:1 oleic acid to alcohol, a reaction temperature 40 °C and a reaction time of 4 h. The effect of water content on esterification was investigated, and it was found that the inhibitory effect of water decreased significantly with increasing temperature. Moreover, DBSA-catalyzed esterification could be applied in the production of various oleic acid-based wax esters and excellent conversion (>90%) to esters was obtained under such mild conditions. DBSA-catalyzed low-temperature esterification is an efficient method for the production of liquid wax esters.Keywords:liquid wax esters;4-dodecylbenzenesulfonic acid;esterification;oleic acid;high-oleic sunflower seed oil
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2014
·Vol. 90
·期 6
·1144-1151
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IF 2.494
Zhenfu Huang,Yuting Ye,Shun Zhu,Yuyuan Yao,Wangyang Lu,Wenxing Chen
BACKGROUND A novel heterogeneous Fenton-like catalyst (FePy-CFs) was prepared by supporting 4-aminopyridine iron (FePy) onto cellulose fibers (CFs) by covalent bonds for the rapid decoloration of Rhodamine B (RhB). RESULTS Compared with the use of homogeneous FePy alone, the introduction of CFs to FePy significantly enhanced the catalytic decoloration of RhB. In addition, repetitive tests revealed that FePy-CFs could maintain high catalytic activity in 15 successive runs, suggesting FePy-CFs has excellent sustaining catalytic ability. More importantly, compared with the traditional homogeneous Fenton reagent, the catalytic reaction could proceed over a wider range of pH values from acidic to alkaline. Various scavengers and probe compounds combined with electron paramagnetic resonance (EPR) technology had been used to identify the active species involved in the catalytic system. The results indicated that hydroxyl radicals (•OH), peroxy radicals (•HO 2 ) and high-valent iron (Fe(IV)) may be responsible for the decoloration of RhB. Furthermore, the effects of operational parameters and thermodynamic parameters have also been investigated. CONCLUSION This study not only opens a new perspective for the development of highly efficient catalytic systems, but also extends the potential applications of cellulose fibers in wastewater treatment. © 2014 Society of Chemical Industry
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2026
·
IF 2.4
Yujiang Ke,Xiaofang Li,Lemei Huang,Chaohui Che,Kui Wu
Abstract The solubility behavior of 4-chlorobenzophenone (4-CBP) was measured in 16 pure solvents (eight alcohols, four ketones, three esters, and acetonitrile) from 271.95 to 324.05 K at atmospheric pressure. X-ray powder diffraction confirmed crystal stability during dissolution, while differential scanning calorimetry determined its melting properties. Five thermodynamic models (modified Apelblat, λh, NRTL, Wilson, and Yaws) were applied to correlate the solubility data. The Kamlet–Abboud–Taft model was introduced to decipher solvent effects by deconvoluting contributions from polarity and hydrogen-bonding. Fitting performance was evaluated using relative average deviation and root-mean-square deviation. Results show that the solubility of 4-CBP increases with rising temperature and that all five models provide satisfactory agreement with the experimental data. The KAT-LSER analysis reveals the dominant solvent parameters that govern solubility. Thermodynamic mixing properties derived from the Wilson model indicate that dissolution is spontaneous and entropy-driven. This study establishes a comprehensive solubility database for 4-CBP, providing critical thermodynamic evidence for the rational design of crystallization processes.
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DRUG METABOLISM AND DISPOSITION
·
2013
·Vol. 41
·期 5
·1082-1093
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IF 3.361
Hao Pan,Liqiang Gu,Siyuan Sun,Zhongjian Chen,Hui Zhou,Su Zeng,Huidi Jiang
Bis(4-fluorobenzyl)trisulfide (BFBTS) is a promising new antitumor agent under investigation. It was metabolized rapidly in vivo in rat, but the metabolic fate and primary site of metabolism have not been clarified. In this study, we investigated the role of blood in the metabolism of BFBTS and compared the BFBTS metabolic potencies in whole blood, plasma, and red blood cells (RBCs) in vitro. Three major metabolites of BFBTS [bis(4-fluorobenzyl)disulfide, para-fluorobenzyl-mercaptan, and para-fluorobenzoic acid] were detected in RBCs and whole blood. Significant metabolism of BFBTS was observed in RBCs that were identified as the primary site of BFBTS metabolism. Thiols, including endogenous thiols and hemoglobin, were proven to be the critical factor in BFBTS metabolism. S-Fluorobenzylmercaptocysteine Hb (hemoglobin) adducts were characterized in vitro at BFBTS concentration of 250 μM and higher, whereas such Hb adducts were not detected in RBCs from Sprague-Dawley rats receiving a single intravenous injection of BFBTS at a high dose of 50 mg/kg. Liquid chromatography-tandem mass spectrometry results revealed that adduction induced by BFBTS was prone to take place at Cys125 of globin β chains. Otherwise, glutathionylation of Hb was also observed that may be attributed to the oxidative effect of BFBTS. In summary, BFBTS was unstable when it met with thiols, and RBCs were the main site of BFBTS metabolism. Hb adducts induced by BFBTS could be detected in vitro at high concentration but not in vivo even at high dose.
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
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2019
·
IF 4.833
Haiyan Zhou,Xiaolei Li,Yuanyuan Li,Xinying Zhu,Lei Zhang,Jing Li
As part of a continuing study, we designed and synthesized four series of 1-phenylimidazole-4-carboxylic acid derivatives as xanthine oxidoreductase (XOR) inhibitors, evaluated their in vitro inhibitory potencies against XOR and hypouricemic effects in mice, and determined their structure-activity relationships (SARs). Most of the compounds exhibited in vitro XOR inhibition at the nanomolar level. In comparison to febuxostat (half-maximal inhibitory concentration [IC 50 ] value of 7.0 nM), compounds Ie and IVa exhibited the most promising XOR inhibitory effects with IC 50 values of 8.0 and 7.2 nM, respectively. In the potassium oxonate/hypoxanthine-induced acute and long-term hyperuricemia mouse models, compounds Ie and IVa displayed significant hypouricemic potencies ( P < 0.05), that were slightly weaker than and similar to febuxostat, respectively. More interestingly, both compounds showed a capacity to improve kidney damage by decreasing creatinine and urea nitrogen levels compared to the long-term hyperuricemia mouse group ( P < 0.05), while febuxostat showed no significant effect.
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PEST MANAGEMENT SCIENCE
·
2023
·
IF 4.1
Wenwen Song,Mingming Dai,Shasha Gao,Yindong Mi,Shijia Zhang,Jianyong Wei,Honghai Zhao,Fangmeng Duan,Chen Liang,Qianqian Shi
Background Root knot nematodes cause great damage to crops worldwide. Due to the negative effects of the application of fumigant and old chemical nematicides, biological nematicides have drawn increasing attention in recent years. Here we tested the fumigant activity of the volatile organic compounds (VOCs) blends emitted from Paenibacillus polymyxa and pure commercial VOCs against M. incognita . Results In this study, we investigated whether P. polymyxa strain J2-4 could produce VOCs that exhibit nematicidal activity. In vitro assays indicated that J2-4 VOCs were highly toxic to second stage juveniles (J2s) and could inhibit egg hatching. Three-layered pot experiments showed that the number of nematodes that penetrating in cucumber roots was reduced by 69.27% after the application of J2-4 VOCs under greenhouse conditions. We identified fourteen volatiles using solid-phase micro-extraction gas chromatography–mass spectrometry. The efficacy of six commercially available VOCs, namely 2-isobutyl-3-methylpyrazine, 2,4-dimethoxybenzaldoxime, 2-dodecanone, 2-tridecanol, 2-tridecanone, and 2-tetradecanol, against M. incognita were examined. Except for 2,4-dimethoxybenzaldoxime, the remaining five VOCs showed strong direct-contact nematicidal activity against J2s of M. incognita , and only 2-isobutyl-3-methylpyrazine showed strong fumigant activity against J2s of M. incognita . In pot experiments, 2-isobutyl-3-methylpyrazine and 2-dodecanone reduced the number of root galls by about 70%, and 2-tridecanone reduced the number of root galls and egg masses by about 63% compared with controls. Conclusion Paenibacillus polymyxa strain J2-4 exhibited high fumigant activity against M. incognita. Our results provide evidence for the use of J2-4 and its VOCs as biocontrol agents in the management of root-knot nematodes. This article is protected by copyright. All rights reserved.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2023
·Vol. 332
·期 10
·3903-3910
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IF 1.6
Zheng RuoChen,Mao GuoShu,Fu Zhihai,Zhang Xian,Yu ShengJie,Yue Yuanzhen,Li Jiayun
A new poly(4-vinylpyridine) resin was prepared and characterized. The adsorption of Th 4+ on resin was studied as a function of contact time, nitric acid concentration, metal ion impurity and initial Th 4+ concentration. The adsorption kinetics and isotherms were analyzed. The results revealed that the adsorption equilibrium for the adsorption of Th 4+ on resin was reached within 30 min. The efficiency of Th 4+ adsorption on resin improves when the nitric acid acidity increases. The adsorption capacity of the resin increases with an increase in the initial concentration of Th 4+ . The thorium distribution coefficient increases with metal nitrate in the system.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Caizhi Lv,Pengchong Jiao,Hui Xin,Lan Wu,Gangfeng Ouyang,Xiandeng Hou
Insulator hydroxyapatite (HAp) was chosen as a candidate to construct full-spectrum photocatalyst. Glucose as a functional precursor was incorporated into HAp by coprecipitated method, and the glucose-modified HAp was then calcined under nitrogen atmosphere. With the loss of OH - group in HAp and the decomposition of glucose during the calcination, oxygen vacancies (OVs) for regulating the band gap, graphitic carbon (GC) as a good electron acceptor, and a channel for rapid carrier separation via the C-O-Ca forming between OV-HAp and GC can be simultaneously achieved. The as-prepared OV-HAp/GC displayed full-spectrum response and rapid separation of carriers. Moreover, it showed high degradation performance for 2, 4-dichlorophenol (2, 4-DCP), phenol, and tetracycline under visible, NIR, and full-spectrum. This strategy is not only facile, but also exhibits a certain universality. This work opens a new window for full-spectrum photocatalysts construction based on insulators, and large-scale production for practical use can be expected.
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JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Zhenxing Fang,Kuang Wu,Le Wang,Da Xu,Weiwei Wang,Yuhang Lin,Xiaohui Liu,Chun Sun
Mn doped two-dimensional (2D) layered perovskites , are becoming excellent candidates as red phosphor because of their high quantum yields (QY) and enhanced stability. However, these Mn doped 2D layered perovskites can only be excited by the near UV light , which largely limits the development of perovskites. Herein, blue-excitable Mn-doped PEA 2 (Pb/Mn)(Br/I) 4 PQDs are synthesized from anion exchange surface engineering strategy. After anion exchange, orange Mn 2+ emission from exciton-to-Mn energy transfer is acquired under the excitation of 450 nm. The PEA 2 (Pb/Mn)(Br/I) 4 compounds exhibit strong luminescence with photoluminescence (PL) QY of 52%, which is comparable to most of the reported red emitting phosphors. A prototype white light-emitting diode (WLED) with good optical performance was fabricated using commercial (Sr,Ba) 2 SiO 4 :Eu phosphor and as-prepared PEA 2 (Pb/Mn)(Br/I) 4 as green and orange color converters, showing great potential in the applications of solid state lighting.
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JOURNAL OF BIOSCIENCE AND BIOENGINEERING
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2020
·
IF 2.366
Shuang Song,Qing Liu,Wei-Ming Chai,Si-Shi Xia,Zi-Yi Yu,Qi-Ming Wei
Inhibition of α-glucosidase as well as non-enzymatic glycation is thought as an effective method for treating type-2 diabetes mellitus. In this study, we investigated the inhibitory potential and mechanism of 4-hexylresorcinol against α-glucosidase and non-enzymatic glycation by using multispectroscopic analyses and molecular docking . The results of enzyme kinetics showed that 4-hexylresorcinol reversibly inhibited α-glucosidase activity in a noncompetitive way. Fluorescence quenching then revealed that it increased the hydrophobicity of α-glucosidase and changed the conformation of the enzyme by forming the α-glucosidase–hexylresorcinol complex. Thermodynamic analysis and molecular docking further demonstrated that the inhibition of 4-hexylresorcinol on the α-glucosidase was mainly dependent on hydrogen bond and hydrophobic interaction. Moreover, the 4-hexylresorcinol moderately inhibited the formation of fructosamine , and strongly suppressed the generation of α-dicarbonyl compounds and advanced glycation end products (AGEs). The interaction between 4-hexylresorcinol and bovine serum albumin was mainly driven by hydrophobic interaction. This study showed a novel inhibitor of α-glucosidase as well as non-enzymatic glycation, and provided a drug candidate for the prevention and treatment of type-2 diabetes.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Yong Liu,Yang Zhao,Jianlong Wang
In this study, a novel Cu 0 -Cu 2 O@CNTs composite was synthesized, characterized and applied to activate peroxydisulfate (PDS) for the degradation of 2, 4-dichlorophenol (2,4-DCP) in contaminated lake water. The results indicated that Cu 0 -Cu 2 O@CNTs can effectively activate PDS to produce O 2 • − radical, which has high selectivity to degrade organic pollutants in actual contaminated water. The efficiency of 2,4-DCP degradation and mineralization was 99.27% and 66.90%, respectively under the optimal condition. In the presence of Cl − , HCO 3 − and natural organic matters (NOMs) or in real wastewater containing 2,4-DCP, Cu 0 -Cu 2 O@CNTs/PDS system had a good selectivity for 2,4-DCP degradation. O 2 • − was the dominant reactive species in Cu 0 -Cu 2 O@CNTs/PDS system for 2,4-DCP degradation. The possible degradation pathway of 2,4-DCP was proposed. It was concluded that Cu 0 -Cu 2 O@CNTs composite could overcome the shortcomings of PDS activation by Cu 0 and Cu 2 O alone, such as low activating capability of Cu 0 and instability of Cu 2 O, which was high efficient for activating PDS. Cu 0 -Cu 2 O@CNTs composite can be used as an efficient catalyst to activate PDS for the degradation of toxic organic pollutants in water and wastewater.
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