JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
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IF 2.6
Zhenxing Cai,Pingxin Li,Hui Zhao,Lingyan Wang,Xiaobo Chen,Chaohe Yang
The solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in p-, o-, and m-xylenes and ethylbenzene was measured by a gas chromatography method under an atmospheric environment. The measured data indicated that the solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in the xylenes and ethylbenzene increases with increasing temperature. The experimentally determined solubility results were fitted with the modified Apelblat equation, Van’t Hoff equation, and Wilson model. Among them, the Wilson model was most consistent with the measured solubility results. The dissolution-related thermodynamic properties of cyclohexanone, tert-butanol, and 1,4-dioxane in xylenes and ethylbenzene, including the changes of molar Gibbs free energy, molar enthalpy, and molar entropy, were predicted and analyzed via the correlated Wilson model, which indicates that the dissolution behaviors are spontaneous and endothermic process. The obtained solubility results provide the thermodynamic foundation for the development and upgrading of industrial separation processes related to xylene, ethylbenzene, cyclohexanone, tert-butanol, and 1,4-dioxane.
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Surfaces and Interfaces
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2022
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IF 6.137
Jin-Yu Wang,Zhong-Zhu Hu,Xin-Ting Sun,Ya-Qin Gao,Jun-Lin Wang,Jie Xu,Gan Jin
Photocatalytic cleavage of lignin C β -O-4 bonds is a very effective method to promote the high-value utilization of lignin because lignin can provide a large number of aromatics. However, the higher carrier recombination rate severely inhibits the efficiency of photocatalytic cleavage of C β -O-4 bonds in lignin model compound. Here, heterojunction photocatalysts CdS-C 3 N 4 were successfully synthesized through the photodeposition of different masses of CdS on the surface of C 3 N 4 . The obtained photocatalyst CdS-C 3 N 4 can effectively break the lignin C β -O-4 bonds in 2-Phenoxy-1-phenylethanol (lignin model compound) and the products formed are mainly phenol (Phol) and acetophenone (Ap). More importantly, the yields of Phol and Ap were up to 86.5% and 74.3%, after only irradiation for 1.5 h, respectively, under optimum conditions. A mechanistic study showed that photocatalytic reaction follows a photogenerated electron-hole coupled mechanism. The high photocatalytic performance of CdS-C 3 N 4 is mainly ascribed to the fast photogenerated electron-hole separation capability and good dispersion of CdS on C 3 N 4 . This work offers an idea for selective cleavage of lignin C β -O-4 bonds by constructing a heterojunction photocatalyst.
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FOOD CHEMISTRY
·
2022
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IF 9.231
Yingyu Zeng,Xusheng Li,Kailan Yuan,Bo Chen,Wenbao Zhang,Chao Wang,Jianxia Sun,Hosahalli S. Ramaswamy,Weibin Bai
Hydroxyphenyl-pyranoanthocyanins (PACNs), derived from anthocyanins (ACNs) reacted with hydroxycinnamic acids, have higher practical application value because of better physicochemical stability than their precursors. However, the slow formation rate restricted their broader applications. In the present study, cyanidin-3- O -glucoside (C3G) was chosen to react with four kinds of hydroxycinnamic acids in a model solution. Changes of color and the production of hydroxyphenyl-PACNs were monitored. The formation of derivatives was time-dependent, and the orange-yellow changing trend was correlated with the formation of PACNs and the consumption of C3G. In addition, high-pressure processing (HPP) as a widely-used non-thermal processing method in the food industry was conducted to investigate its impact on hydroxyphenyl-PACNs formation. The results showed that HPP significantly improves the yield of two types of hydroxyphenyl-PACNs (C3G-4-vinylcatechol and C3G-4-vinylphenol) and the retention of total residual pigments during 56 days of storage. Therefore, HPP contributed to color-protecting and the transformation of hydroxyphenyl-PACNs.
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Catalysts
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2023
·Vol. 13
·期 2
·239
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IF 3.9
Mohammed Jalalah,Zubair Nabi,Muhammad Naveed Anjum,Mirza Nadeem Ahmad,Atta Ul Haq,Muhammad Bilal Qadir,Mohd Faisal,Mabkhoot Alsaiari,Muhammad Irfan,Farid A. Harraz
Growing industry and its effluents create a serious environmental concern. Various industrial wastes such as toxic dyes and volatile organic compounds are posing a threat to a clean environment because of their non-biodegradable nature and high chemical stability. In recent years, the degradation of toxic dyes and drugs by photo-catalysts has gained much importance and proved a successful approach to capture light by hybrid photo-catalysts for decomposing toxic organic molecules. This work presents the synthesis of a poly(o-anisidine)-based composite with graphitic carbon nitride and zinc oxide (POA/g-C3N4/ZnO) and its utilization as a photo-catalyst. Various analytical techniques investigated the synthesized photo-catalysts’ chemical structure, crystallinity, and morphology. The degradation of Congo red dye evaluated the efficiency of the photo-catalyst in an aqueous medium under ultraviolet light. It was revealed that the photo-catalytic activity of the synthesized POA/g-C3N4/ZnO composites show 81.43%, 92.28%, and 87.05% degradation. This sustainable composite will be highly beneficial to treat industrial wastewater to make our environment clean.Keywords:poly(o-anisidine);graphitic carbon nitride;zinc oxide;ternary composite;photo-catalytic degradation;Congo red;industrial wastewater treatment
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
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IF 13.6
Fangmin Wu,Jun Nan,Tianzuo Wang,Zhencheng Ge,Bohan Liu,Meng Chen,Xuesong Ye
The activity and selectivity of the cathode towards electrosynthesis of H 2 O 2 are critical for electro-Fenton process. Herein, nickel-foam modified with N, O co-doped graphite nanosheets (NO-GNSs/Ni-F) was developed as a cathode for highly efficient and selective electrosynthesis of H 2 O 2 . Expectedly, the accumulation of H 2 O 2 at pH= 3 reached 494.2 mg L −1 h −1 , with the selectivity toward H 2 O 2 generation reaching 93.0%. The synergistic effect of different oxygen-containing functional groups and N species on the performance and selectivity of H 2 O 2 electrosynthesis was investigated by density functional theory calculations, and the combination of epoxy and graphitic N (EP + N) was identified as the most favorable configuration with the lowest theoretical overpotential for H 2 O 2 generation. Moreover, NO-GNSs/Ni-F was applied in the electro-Fenton process for p-nitrophenol degradation, resulting in 100% removal within 15 min with the kinetic rate constant of 0.446 min −1 and 97.6% mineralization within 6 h. The efficient removal was mainly attributed to the generation of bulk ·OH. Furthermore, NO-GNSs/Ni-F exhibited excellent stability. This work provides a workable option for the enhancement of H 2 O 2 accumulation and the efficient degradation of pollutants in electro-Fenton system.
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FOOD RESEARCH INTERNATIONAL
·
2023
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IF 8.1
Junwen Wan,Qian Liu,Changzhong Ma,Bertrand Muhoza,Yaling Huang,Min Sun,Shiqing Song,Chi-Tang Ho
To understand the overall flavor of the dzo beef, fatty acids, volatile compounds and aroma profiles of dzo beef samples (raw beef (RB), broth (BT) and cooked beef (CB)) were investigated by head-space-gas chromatography-ion mobility spectrometry (HS-GC-IMS) and gas chromatography-mass spectrometry (GC–MS). The fatty acid analysis showed a decrease in the ratio of polyunsaturated fatty acids, such as linoleic acid, which decreased from 2.60 % in RB to 0.51 % in CB. The principal component analysis (PCA) showed that HS-GC-IMS was able to distinguish different samples. A total of 19 characteristic compounds with odor activity value (OAV) > 1 were identified by gas chromatography–olfactometry (GC-O). Fruity, caramellic, fatty and fermented attributes were enhanced after stewing. Butyric acid and 4-methylphenol were responsible for the stronger off-odor in RB. 3-Hydroxy-2-butanone and 2,5-dimethyl-4-hydroxy-3(2 H )-furanone with buttery and caramellic attributes were dominated in BT, while ( E )-2-nonenal, ( E , E )-2,4-decadienal and ( E , E )-2,4-nonadienal prominently conferred fatty attribute on CB. Furthermore, anethole with anisic aroma was first identified in beef, which may be one of the typical chemical markers that distinguish dzo beef from other varieties.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 38
·13047-13055
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IF 6.4
Xuemei Zhou,Lingmin Kong,Junkai Hao,Jing Feng,Shuo Sun,Chuanzhen Zhou,Yanmin Liu,Zhengquan Yan,Xiao Zhu,Lei Hu
To strengthen the enzyme-mimetic catalytic activity of the classical transition metal oxide of copper and iron, bimetal Cu–Fe oxide mesoporous nanoparticles (Cu–Fe MNPs) were prepared in one pot under microwave-assisted conditions. The proposed Cu–Fe MNPs possessed a well-distributed mesoporous structure with an average aperture of 3.91 nm and a high BET specific surface area of 197.93 m2 g−1. Their peroxidase-like kinetic parameters (Km/Vmax) toward catalyzing the redox reactions of TMB and H2O2 were 0.013 mM/3.01 × 10−8 M s−1 and 56.58 mM/4.12 × 10−8, respectively. In particular, both toxic o-aminophenol (o-AP) and bioactive glutathione (GSH) could deteriorate their peroxidase-like property with an obvious color change from blue to colorless in the proposed Cu–Fe MNPs-TMB-H2O2 system. Under optimized conditions, Cu–Fe MNPs-TMB-H2O2 showed selective response to o-AP and GSH with quite low detection limits of 1.57 × 10−8 mol L−1 (S/N = 3) and 3.35 × 10−8 mol L−1 (S/N = 3), respectively. When they were applied for the visual monitoring of o-AP and GSH in real aqueous, fruit juice and medicinal samples, the detection recovery (%) was between 96.8–101.4% for o-AP and 97.1–105.8% for GSH. The mechanisms of the synergetic enhancement of the peroxidase-like activity of Cu–Fe MNPs and the selective recognition of o-AP and GSH were investigated in detail.
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FOOD CHEMISTRY
·
2023
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IF 8.8
Wenhui Wang,Zhen-quan Yang,Lixia Xiao,Jie Han,Tianzhu Guan,Xiaojuan Gong,Qin Hu
A paper-based assay for visualization of auramine O (AO) was for the first time established by using CFMs as a ratiometric fluorescent probe (RFP). The CFMs were melamine formaldehyde microspheres (MFMs) incorporated with carbon dots (CDs), where the CDs species as sensing units and MFMs as a signal amplification carrier. The proposed RFP can quantitatively measure AO content from 0.0 to 10.0 μM and exhibited an ultralow limit of detection (LOD, 15.7 nM). In particular, obvious luminescence color change of CFMs from blue to green was perceived with naked-eyes and therefore, a solution-based and a paper-based visualization platform were respectively proposed for on-site visual detection of AO with LODs of 1.15 μM and 0.83 μM, separately. Finally, those fluorescence methods were adopted in sensitively quantitative measurement of AO within various food and drug samples, providing new prospects for analysts and technical support in food quality monitoring.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yating Kan,Chenhua Han,Ying Ye,Xiao Zhang,Yuanfeng Huang,Liang Xing,Yifan Zhou,Huawei Qin
An all-solid-state ammonium ion-selective electrode, with silver/nano-silver wire as the substrate, polyaniline as transducer and poly (o-phenylenediamine) as sensitive membrane, is presented. The nano-silver was prepared by electrodeposition in 0.1 M AgNO 3 standard solution with the half-sine wave at amplitude of 500 mV, frequency of 50 HZ and action time of 1 min. The polyaniline and poly (o-phenylenediamine) were electropolymerized on the surface of the silver/nano-silver substrate by cyclic voltammetry with the scanning potential from 0 to 0.45 V in solutions of 1.0 M aniline hydrochloride and 0.08 M o-phenylenediamine hydrochloride, respectively. Under the SEM, poly (o-phenylenediamine) with 0.5-5 μm in size was evenly and firmly embedded on the surface of the PANI. This ammonium electrode exhibited low impedance of approximately 70 Ohm. It can detect as low as 1.2×10 -5 M of ammonium ion, with the slopes of 54.99-55.70 mV per decade (R 2 >0.99) within a linear range between 2×10 -5 M to 0.1 M. It responds as quickly as 0.5-2 s, as well as its lifespan extends to at least 147 days. The electrode showed a superior selectivity toward NH 4 + , and was successfully applied to detect the NH 4 + concentration in real samples. In addition, this electrode is miniature and convenient for package and assembly, which will enable in-situ measurement and long-term monitoring of NH 4 + concentration in rivers, lakes and industrial sewage.
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Lingxiang Zhao,Xinyue Cheng,Zhaoxian Wang,Enzhe Zhang,Zilian Liu,Huajing Zhou,Liang He,Qingqing Guan
Although alkaline sulfite activation of ferrate (Fe(VI)) has advantages of fast response and high activity for degradation of organic contaminants , the specific production pathways of active species and the pH conditions still hinder its widespread application. Based on this, our study constructed a novel advanced oxidation process of calcium sulfite (CaSO 3 ) could activated Fe(VI) continuously by Ca 2+ buffering and investigated the mechanism under different pH values and CaSO 3 dosages with ciprofloxacin as a target organic pollutant. The results showed that Ca 2+ stabilized the process at a neutral/weakly alkaline microenvironment of pH 7–8, which could alleviate the hydrolysis of ≡Fe IV =O by protons and iron hydroxyl groups. Besides, the removal of pollutants occurred efficiently when sulfate (SO 3 2− ) was excessive and had a 3:1 ratio of SO 3 2− to Fe(VI), achieving more than 99% removal of electron-rich phenolic organic pollutants within 2 min. By adding different radical scavengers and combining electrochemical analysis methods and electron paramagnetic resonance spectroscopy techniques to revealed that the main active species in Fe(VI)/CaSO 3 process were ≡Fe IV =O/≡Fe V =O. Furthermore, the reactivity of various sulfate species (such as SO 3 2− , SO 3 •− , SO 4 •− , SO 5 •− ) with Fe(VI) was calculated using density functional theory (DFT), and it was found that Fe(VI)–SO 3 2− reaction has a much lower energy barrier (−36.08 kcal/mol), indicating that SO 3 2− can readily activate Fe(VI) and generate ≡Fe IV =O to attack the atoms with high Fukui index (f - ) in organic pollutants. The above results confirm the feasibility of Fe(VI)/CaSO 3 process. Thus, this study can theoretically and practically prove that the main active species is ≡Fe IV =O, rather than SO 4 •− or • OH in Fe(VI)/CaSO 3 process.
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CARBON
·
2022
·
IF 11.307
Min Yuan,Zeping Wang,Yifan Rao,Ying Wang,Bo Gao,Jiabing Yu,Hui Li,Xianping Chen
Carbon materials with multiple heteroatoms co-doping and hierarchically porous structures have attracted great attention as promising electrode-active materials for supercapacitors. In this paper, an efficient, green, and low-cost strategy is reported to produce O/N/S co-doped hierarchically porous graphene, using laser direct writing on carboxymethyl chitosan (CMCS)/sodium lignosulphonate (SLS) reinforced wood. The resultant materials possess a typical three-dimensional (3D) framework composed of interconnected micro-, meso- and macropores, a large specific surface area, together with rich heteroatoms doping (13.72 wt% for O, 2.06 wt% for N, and 1.68 wt% for S). These superior features have afforded the as-fabricated microsupercapacitor (MSC) with an excellent areal capacitance of 82.1 mF cm −2 at 0.1 mA cm −2 and correspondingly high energy density of 7.3 μWh cm −2 . Moreover, the MSC has good cycling stability (retaining 84.3% of capacitance after 10000 cycles) and favorable modular integration capabilities. Accordingly, this facile preparation of multiple heteroatoms-doped porous graphenes from various renewable and eco-friendly biomass precursors offers promising prospects for low-cost mass production of graphene-based sustainable high-performance electrochemical energy storage.
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Current Research in Food Science
·
2022
·
IF 6.269
Yang Lin,Cong Li,Ping Shao,Ligang Jiang,Bilian Chen,Mohamed A. Farag
Anthocyanins (ACNs) as one category of water-soluble flavonoid pigments are increasingly employed in pH sensing indicator applications for monitoring food freshness. Nevertheless, considering that anthocyanins are sensitive to environmental factors, their practical applications in food industries are still rather limited. In order to improve the stability of anthocyanins and capitalize upon their application in pH-color responsive intelligent packaging, this study aims to graft octanoic aid onto raspberry anthocyanins catalyzed by immobilized Candida antarctica lipase B (Novozymes 435). Structural analyses based on Fourier transform infrared spectroscopy (FTIR), UV–Vis, liquid chromatography-mass spectrometry (LC-MS), and nuclear magnetic resonance (NMR) revealed that octanoic acid was regioselective grafted onto the 6-OH position of its glucoside. The acylation efficiency of C3G by octanoic acid up to 47.1%. The octanoic acid moiety was found to improve lipophilicity, antioxidant activity and stability of C3G. In addition, acylated derivative also maintained the pH-color response characteristics of nature ACNs and exhibited excellent NH 3 response properties. These results indicated that acylated anthocyanins exhibit potential application as intelligent packaging indicator for monitoring food freshness.
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危险品化学品经营许可证（带存储）