Environmental Science-Nano
·
2023
·Vol. 10
·期 7
·1897-1906
·
IF 7.3
Yang Yang,Junmin Peng,Huilin Tao,Zhou Yang,Yidong Hou,Wei Lin,Jinshui Zhang
The development of efficient catalysts is of great significance in the photocatalytic ozonation process for organic wastewater treatment. However, the effect of exposed facets and surface defects of the catalyst on the photocatalytic ozonation performance is less covered. Herein, ZnO nanocomposites with different preferentially exposed crystal facets (ZnO-rod and ZnO-disk) were synthesized and used for photocatalytic ozonation of phenol. The characterization and density functional theory calculation results demonstrated that the exposed {0001} facets and oxygen vacancies promoted the separation and transfer of photogenerated charges as well as improved the adsorption and activation of ozone molecules on the catalyst surface. Consequently, the TOC removal rate in the UV-O3/ZnO-disk process (62.4%) was much higher than those in the UV-O3/ZnO-rod process (41.3%) and the UV-O3 process (15%). Moreover, the experimental results of the identification and quenching of active species illustrated that ˙OH was more likely to be produced in the UV-O3/ZnO-disk process, while 1O2 was more likely to be formed over ZnO-rod. A large amount of ˙OH with a stronger oxidation capability than 1O2 contributed to the superiority of ZnO-disk over ZnO-rod in organic pollutant removal. This work demonstrates that the engineering of crystal facets and surface defects provides an effective strategy for constructing efficient catalysts for the photocatalytic ozonation process.
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Foods
·
2023
·Vol. 12
·期 11
·2151
·
IF 5.2
Baorong Chen,Xiaodan Wang,Yumeng Zhang,Wenyuan Zhang,Xiaoyang Pang,Shuwen Zhang,Jing Lu,Jiaping Lv
This study aimed to determine chemical composition and assess exposure in flavored milk among Chinese residents, based on risk assessment methodologies of acceptable daily intake (ADI) and toxicological concern threshold (TTC). Esters (32.17%), alcohols (11.19%), olefins (9.09%), aldehydes (8.39%), and ketones (7.34%) comprised the majority of the flavoring samples. Methyl palmitate (90.91%), ethyl butyrate (81.82%), and dipentene (81.82%) had the highest detection rates in flavor samples. This study screened fifteen flavor components of concern and discovered that 2,3,5-trimethylpyrazine, furfural, benzaldehyde, and benzenemethanol were detected in 100% of flavored milk samples. Benzenemethanol was found in the highest concentration (14,995.44 μg kg−1). The risk assessment results revealed that there was no risk for Chinese residents in consuming flavored milk, and the maximum per capita daily consumption of 2,3,5-trimethylpyrazine, furfural, and benzenemethanol were 226.208 g, 140.610 g, and 120.036 g, respectively. This study could provide guidelines for amounts of flavor additive ingredients in milk.Keywords:flavored milk;SPME-GC/MS;flavor components;acceptable daily intake;toxicological concern threshold
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Foods
·
2023
·Vol. 12
·期 11
·2160
·
IF 5.2
Si Li,Fangwei Liu,Mulan Wu,Yuhao Li,Xiaoxiao Song,Junyi Yin
In this study, different drying methods, including hot air drying, sun drying, and freeze drying were employed to dry fresh broad beans. The nutritional composition, volatile organic components and bioactive substances of the dried broad beans were systematically compared. The results indicated significant differences (p< 0.05) in nutritional composition, such as protein and soluble sugar content. Among the 66 identified volatile organic compounds, freeze drying and hot air drying significantly promote the production of alcohols and aldehydes, while sun drying effectively preserves esters. In terms of bioactive substances, broad beans dried by freeze drying exhibit the highest total phenol content as well as the strongest antioxidant capacity and gallic acid, followed by sun drying. The chemometric analysis revealed that the bioactive compounds in broad beans dried by three different methods were primarily composed of flavonoids, organic acids, and amino acids with significant differentiation. Notably, freeze-dried and sun-dried broad beans exhibited a higher concentration of differential substances.Keywords:broad beans;drying method;nutrition composition;bioactive substances
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Water
·
2023
·Vol. 15
·期 12
·2243
·
IF 3.4
Jing Wang,Quanfeng Wang,Pei Gao,Da Sun,Libo Jin,Li Ma,Lan Yang,Jujiao Zhao
Peroxymonosulfate (PMS) activation is an intriguing technology for refractory organic pollutant removal in wastewater treatment. Herein, a highly dispersed Mn-Ce bimetallic oxide on carbon nanotubes (MCC) was synthesized and applied to catalyze PMS for the degradation of phenol. The material was well characterized using a transmission electron microscope (TEM), N2adsorption–desorption isotherms, X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The synthesized MCC showed superior activity for PMS activation. Thekvalue of phenol removal with MCC is 0.135 min−1, which is greatly superior to that of CNT (6.17 × 10−5min−1) and Mn-Ce bimetallic oxide (3.18 × 10−4min−1). Electron paramagnetic resonance (EPR), along with radical quenching experiments, revealed that the activation of PMS by MCC for phenol degradation involves both radical and non-radical reaction pathways. Moreover, a synergic effect between Mn-Ce bimetallic oxide and CNT was identified to be responsible for the outstanding catalytic activity.Keywords:PMS activation;Mn-Ce bimetallic oxide;CNT;synergic effect
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Zi-Wen Zhou,Zhe-Ning Wu,Chun-Xian Cai,Ru-De Lin,Xiao-Qi Yu,Kun Li,Na Wang
Covalent Organic Frameworks (COFs) with uniform aperture size, high surface area and tunable structure have been proposed as a potential material in water treatment. In this work, we utilized methoxy based covalent organic frameworks (COF–OMe) at room temperature as a dual-role smart material. For one thing, it can respond to the pH of solutions by visual, colorimetric change. Due to the protonation effect of methoxy groups in its pore skeleton, the fluorescent intensity of COF–OMe went down and the color changed from yellow to black as the pH decreased reversibly. For another, the abundant pores and ordered conjugated structure endowed it with a large surface area and light absorption ability. Therefore, the light-triggered oxidase-mimic porous COF–OMe can be applied in the synergistic removal of organic pollutants with synergistic physical absorption and light degradation. The outstanding and sensitive response to pH, great removal efficiency and dual function made it applied in water treatment with great potential, achieving killing two birds with one stone.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wei Chen,Xinning Dai,Zhujun Liu,Bin Du,Xinyu Zheng,Dandan Ma,Xianbin Huang
Periodate-based advanced oxidation processes (PI-AOPs) exhibited a promising future for the reduction of emerging refractory organic pollutants . However, the underlying mechanism and the sulfuretted effect of sulfide-modified metal silicate materials for PI activation were still unclear. In this study, sulfide-modified metal silicates (S-CoSi) were first synthesized and applied in the PI-AOPs system. Different from traditional metal silicate materials, sulfurization improved the catalytic performance. The enhanced degradation performance was from the increase in specific surface area and charge transfer efficiency, which derived from the sulfurization in metal silicate. DFT calculations revealed that the enhanced charge densities of Co-S bonds promoted the existence of Co (Ⅱ), which was more conducive to PI activation. Experimental and calculation results further demonstrated that Co was the active site in S-CoSi, and sulfur species strengthened the radical pathway by assisting Co (Ⅱ) regeneration (electron transfer from S to Co) rather than participating in the PI activation. Moreover, sulfurization promoted the generation of 1 O 2 (non-radical pathway) by increasing oxygen vacancy in the metal silicate. This study provided new insights into the effect of sulfurization on the radical and non-radical pathways in the metal silicates PI system.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yang Liu,Xueping Dang,Huaixia Chen
A molecularly imprinted polymer (MIP) monolithic column was prepared in situ in a pipette tip using phenol and bisphenol A as dual templates, 4-vinyl pyridine and β -cyclodextrin as bifunctional monomers . It was used for the selective and simultaneous solid phase extraction of eight phenolics, including phenol, m-cresol, p-tert-butylphenol, bisphenol A, bisphenol B, bisphenol E, bisphenol Z, and bisphenol AP. The MIP monolithic column was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy , thermogravimetric analysis and nitrogen adsorption experiment. The results of selective adsorption experiments showed that the MIP monolithic column can selective recognize the phenolics and have excellent adsorption property. The imprinting factor for bisphenol A can be as high as 4.31, and the maximum adsorption capacity for bisphenol Z can reach 201.66 mg g −1 . Under the optimal extraction conditions, a selective and simultaneous extraction and determination method for eight phenolics was established based on the MIP monolithic column and high-performance liquid chromatography with ultraviolet detection. The linear ranges (LRs) of the eight phenolics were 0.5–200 μg L −1 , the limits of quantification (LOQs) and detection (LODs) were 0.5–2.0 μg L −1 and 0.15–0.67 μg L −1 . The method was applied to detect the migration quantity of the eight phenolics from polycarbonate cups and had satisfactory recovery. The method has the advantages of simple synthesis, short extraction time, as well as good repeatability and reproducibility, which provides a sensitive and reliable strategy for extracting and detecting phenolics from food contact material.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dongli Li,Liqin Zhou,Zongwu Wei,Xingzhen Qin,Hongbing Ji,Kungang Chai
Chlorophenols (CPs), a kind of important intermediate for fine chemicals, exists widely in the aqueous environment and poses a significant danger to humans. Therefore, developing advanced materials to enable the effective capture of CPs is highly desired. Herein, β-cyclodextrin-based porous carbon (CPAC) with exceptional capacities for CPs has been designed and tested. These porous carbon adsorbents were successfully synthesized via stepwise carbonization, affording abundant N and O functional groups, high surface area (as high as 3982 m 2 ·g −1 ) and controlled pore size to optimize for rapid CPs uptake. According to the CPs uptake measurements, CPAC exhibited exceptional CPs adsorption performance. CPAC showed high adsorption capacities (1085.08 mg · g −1 for 2,4,6-trichlorophenol) and fast adsorption kinetics for CPs. CPAC can effectively recover multi-component CPs from complex aqueous media, and the special pore structure reduces the competitive adsorption between CPs. And the recyclability studies showed that CPAC maintained its structural integrity and the initial CPs uptake capacity, highlighting its potential for practical application. Besides, DFT calculations indicate that hydrogen bonding and π-π interactions are key factors. Among them, the molecular conformation of CPs and the number of chlorine atoms on phenol play a crucial role in the adsorption behavior and adsorption energy.
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TALANTA
·
2023
·
IF 6.1
Jiaming Ling,Ting Wang,Zhoujian Xie,Xinqiao Cheng,Kungang Chai,Pengfei Li
Chromatographic stationary phases with molecular-shape selectivity are advantageous for the separation and analysis of geometric isomers. Herein, dehydroabietic acid is bonded on the surface of silica microspheres via 3-glycidoxypropyltrimethoxysilane to form a monolayer dehydroabietic-acid stationary phase (Si-DOMM) with a racket-shaped structure. Various characterization techniques indicate that Si-DOMM is successfully prepared, and the separation performance of a Si-DOMM column is evaluated. The stationary phase has a low silanol activity and metal contamination and a high hydrophobicity and shape selectivity. The resolutions of lycopene , lutein , and capsaicin on the Si-DOMM column confirm that the stationary phase exhibits high shape selectivity. The elution order of n -alkyl benzene on the Si-DOMM column indicates its high hydrophobic selectivity and suggests that the separation is an enthalpy-driven process. Repeatability experiments reveal highly stable preparation processes of the stationary phase and column and indicate that the relative standard deviations of retention time, peak height, and peak area are less than 0.26%, 3.54%, and 3.48%, respectively. Density functional theory calculations using n -alkylbenzenes, polycyclic aromatic hydrocarbons , amines, and phenols as model solutes provide an intuitive and quantitative description of the multiple retention mechanisms. The Si-DOMM stationary phase exhibits superior retention and high selectivity for these compounds via multiple interactions. The bonding phase of the monolayer dehydroabietic acid stationary phase with a racket-shaped structure has a unique affinity for benzene, strong shape selectivity, and good separation performance for geometrical isomers with different molecular shapes.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Panpan Zhou,Jing Zhang,Zhi Song,Lixi Wang,Qitu Zhang
An enormous challenge exists in the development of low-density and efficient microwave absorbers with thin matching thickness. Carbon materials with hierarchical porosity are regarded as potential candidates for practical applications of microwave absorption (MA) materials on account of their rich pore structure which facilitates the entry and attenuation of electromagnetic waves. Herein, ordered mesoporous carbon with hierarchical interconnected network structure (NOMC) was prepared through a self-assembly method and calcination treatment. It was found that by adjusting the annealing temperature, the hierarchical porous structure, the carbon defect, the dielectric loss property and the MA property could be tuned. Thanks to the balance between sufficient hierarchical porous structure, outstanding impedance matching condition and multiple loss modes, NOMC displays outstanding ability to dissipate electromagnetic waves at a very thin absorbing coating thickness. Notably, as-prepared NOMC-700 displays an outstanding MA property, whose minimum reflection loss (RL min ) value reaches −27.5 dB at 16.72 GHz and the effective absorption bandwidth (EAB) achieves 3.2 GHz (14.8–18 GHz) under 1.5 mm absorbing coatings. Hence, the satisfying design in porous microstructure can pave the way for efficient MA materials with thin matching thickness.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yunning Chen,Zhengkai Wu,Renquan Guan,Xueying Cheng,Qingkun Shang,Yingnan Sun
Improving the efficiency of photogenerated charge separation and transport is the primary goal of designing and constructing efficient composite photocatalysts. The matching of energy bands and the formation of chemical bond between the two components are very conducive to the separation and transmission of photogenerated charges. Herein, three perylene diimide derivatives (PDIs) are synthesized by introducing sulfonic acid group (PDI-SA) and benzenesulfonic acid (PDI-BSA) respectively into the amide bond and further chlorine bay-substituting (Cl-PDI-BSA). The good water solubility of Cl-PDI-BSA ensures its forms a stable chemical bond with TiO 2 through the sulfonic acid group in the single molecular state, coupled with the matching of energy band structure, TiO 2 @Cl-PDI-BSA exhibited excellent performance upon visible light photocatalytic degradation to phenol and trenbolone acetate (TBA). It can remove 100% of phenol in 15 min and 100% trenbolone acetate (TBA) in 30 min, which is 14.3 times that of TiO 2 . Combining to DFT calculation, Kelvin probe force microscope and EPR analysis prove that bay chlorine substitution has a greater impact on the energy band structure and electron cloud distribution of PDIs than N-sulfonation, thereby seriously affecting the transport of photogenerated carriers with TiO 2 .
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Molecular Catalysis
·
2023
·
IF 4.6
Chan Meng,Heming Zhang,Qian Su,Hanwen Yan,Changyuan Du,Yunong Li,Li Dong,Weiguo Cheng
In view of the harsh conditions of cyclic esterification reaction of ethylene glycol (EG) and carbon dioxide (CO 2 ) to synthesize ethylene carbonate (EC), the yield is low and the catalysts are mostly metals, a series of green acid-base bicentric ionic liquids (ABbILs) were developed. Among them, the ABbILs of 1,5,7-Triazabicyclo[4.4.0]dec‑5-ene glutarimide ([TBDH][Glu]) had the best catalytic performance. Under the optimal reaction conditions, the yield of EC reached 29.5%, which was higher than most of the conventional metal-based catalysts. Through activity screening results and DFT calculation, it was found that different cations affect the interaction between N on anion and H proton of EG, and the H on the cation can activate the O on EG, which would affect the ability of ABbILs to activate EG. The acid-base bicentered synergistic catalytic mechanism of Bronsted acid and Lewis base was proposed by characterization and DFT calculation. This study opens up new avenues for the efficient conversion of diols and CO 2 for the preparation of cyclic carbonates.
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