SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Zhengming He,Cong Li,Jingzhen Su,Kai Zhang,Jiaxue zhu,Ren Cai,Yunshu Zhang,Jieming Yuan,Xiaohong Guan
Iron-based catalysts are generally used to activate oxidizing species, such as hydrogen peroxide by increasing homogeneous active substances like free radicals, to promote the degradation of organic matter. However, less attention has been paid to the reactions on the surface or the generation of heterogeneous metal-oxo species. Herein, oxygen vacancies (Vo) were introduced into Fe oxides by a calcination-induced hetero-atom doping modification. The characteristic peak of the heterogeneous hypervalent iron-oxo [≡Fe IV =O] species in the UV–Vis spectrum at 371 nm was observed. In the context of electrochemical experiment, Vo-rich Mn-Fe 2 O 3 significantly enhanced the electron conduction of sulfamethoxazole and H 2 O 2 , while simultaneously inhibiting the self-decomposition of potassium ferrate (Fe(VI)). Regarding the H 2 O 2 generated during the self-decomposition process of Fe(VI), Vo-rich Mn-Fe 2 O 3 can accelerate the degradation of sulfamethoxazole, increasing the reaction rate to 0.1081 min −1 (with a 30.05 % improvement in removal efficiency). Density functional theory calculations indicate that Vo leads to an enhanced capture of O atoms by the low-coordinated Fe atoms, promoting the anchoring of H 2 O 2 and the formation of the active ≡Fe IV =O with a higher spin state. This work proposes heterogeneous reactive species on the surface of metal oxidase, constructing Vo as the O atom capture sites in iron-based oxides to facilitate the formation of ≡Fe IV =O and the degradation of organic compounds.
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高影响因子
BMC Chemistry
·
2019
·Vol. 13
·期 1
·1-15
·
IF 0
Guo J.,Ma Yu L.,Yu Jia Y.,Gao Yu J.,Ma Ning X.,Wu Xiao Y.
Herein, 2-(2-methoxyphenoxy)-1-phenylethanol (β- O -4), 2-methoxyphenyl anisole (α- O -4) and 4-phenoxyphenol (4- O -5) were selected as typical lignin model compounds. Given the effectiveness of traditional acid–base catalysts for lignin depolymerisation, a novel Ni/CaO–H-ZSM-5(60) catalyst was prepared to investigate the difficulty level of C–O bond of three model compounds cleavage in ethanol. It was observed that Ni/CaO–H-ZSM-5(60) had prominent performance on the C–O bond cleavage at very mild conditions (140 °C, 1 MPa H 2 ). Among them, the C–O bond of α- O -4 and β- O -4 could be completely cleaved within 60 min. Although the C–O bond of 4- O -5 had high bond energy, 41.2% of conversion was occurred in 60 min. The introduction of CaO could regulate the acidity of H-ZSM-5 to enhance the ability to break C–O bonds. Moreover, the possible pathways of C–O ether bonds in three lignin model compounds cleavage were proposed in order to selectively obtain target products from the raw lignin degradation.
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FOOD CHEMISTRY
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2025
·
IF 9.8
Chanchan Sun,Xv Qin,Miaomiao Huang,Xiaoru Wang,Bin Liang,Xiulian Li
The impact of interfacial structure on lipid digestion of emulsions remains controversial, presenting a key limitation in developing technologies for precise regulation of nutritional characteristics through rational food structure design. This study employed pea protein isolate (PPI) microgel particle (PPM) and PPI-κ-carrageenan (κ-CG) composite microgel particle (PPCM) as a model system. The mixing ratio of these macromolecules was adjusted, which changed the interaction of protein and polysaccharide molecules, as well as the interfacial structure of PPCM. Subsequent analysis of structural changes and emulsion digestion in an in vitro simulated digestion model elucidated the regulatory mechanism of interfacial structure on lipid digestion of Pickering emulsions (PPM-E and PPCM-E). The results demonstrated that free sulfhydryl and hydrophobic groups embedded in PPI became exposed during the heat-shearing process of microgel preparation, facilitating disulfide bond formation. The κ-CG gel associated with PPI gel through non-covalent bonds, effectively shielding the exposed hydrophobic groups of PPI. Based on the thickness of the interface, the amount of adsorbed protein, and the protein concentration at the interface, and the surface dilatational modulus, it was found that the deformability of microgel particles at the interface varies. This variation leads to differences in the interfacial structure: PPM formed thick but sparsely distributed interfacial layers due to its limited interfacial deformability; PPCM1 and PPCM2 formed thinner and denser interfacial layers with exposed κ-CG gels on the surface owing to because of their greater deformability compared to PPM; PPCM3, PPCM4, and PPCM5 exhibited the thinnest and densest interfacial layers among the microgel particles, with the exposed κ-CG interconnected to form a polysaccharide network surrounding the oil droplets. Compared with PPM-E, the κ-CG outside the interfacial layer of PPCM1-E and PPCM2-E promoted the expansion of the interfacial microgel in the simulated intestinal fluid and enhanced the hydrolysis by trypsin and lipase, resulting in higher free fatty acid (FFA) release than PPM. In contrast, the κ-CG network outside the interfacial layer of PPCM3-E, PPCM4-E, and PPCM5-E impeded the trypsin and lipase activity, thereby inhibiting the lipid digestion and resulting in lower FFA release than PPM.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 17
·期 5
·3010-3017
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IF 8.02
Yao-Bing Huang,Long Yan,Meng-Yuan Chen,Qing-Xiang Guo,Yao Fu
Direct hydrogenolysis of the aromatic Csp2–O bonds in both phenols and phenyl ethers to form arenes selectively is a core enabling technology that can expand greatly the scope of chemical manufacture from biomass. However, conventional hydrogenolysis of phenols typically led to aromatic ring saturation instead of the cleavage of the Csp2–O bonds. Herein, we report a recyclable Ru–WOx bifunctional catalyst that showed high catalytic activities for the hydrogenolysis of a wide range of phenols and phenyl ethers, including dimeric lignin model compounds and the primitive phenols separated from pyrolysis lignin, to form arenes selectively in water. Preliminary mechanistic studies supported that the reactions occurred via a direct cleavage of the Csp2–O bonds and the concerted effects of the hydrogenating Ru sites and the Lewis acidic W sites are the key to such an unusual reactivity.
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RSC Advances
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2016
·Vol. 6
·期 47
·41420-41427
·
IF 3.289
Guohui Li,Avinav G. Nandgaonkar,Keyu Lu,Wendy E. Krause,Lucian A. Lucia,Qufu Wei
The engineering of supports for enzyme immobilization while retaining competent functionality is nontrivial. We attempted to enhance the removal efficiency of organics by adopting a relatively novel approach involving a synergy from the adsorption capabilities of a support incorporated with organically modified montmorillonite (O-MMT) and catalytic properties of immobilized laccase. Electrospun polyacrylonitrile (PAN)/O-MMT membranes after alkaline hydrolysis and carboxyl activation were chosen as the support system for laccase immobilization. A confocal laser scanning microscope confirmed a uniform enzyme distribution along with the fibers' longitudinal surface. After enzyme immobilization, the optimum pH shifted from 3 to 3.5, while the optimum temperature remain unchanged at 50 °C. Its stability was preserved despite a large fluctuation in pH (50% of its initial activity retained over the pH range 2–6) and temperature (more than 80% of its initial activity retained over 30–70 °C). Compared to free laccase, the thermal stability of the immobilized laccase was improved after being under 30 °C and 50 °C for 8 h. The operational stability was 68% of the initial one after 10 times repeated usage, while also demonstrating 80% storage stability of the initial activity even after two months. The immobilized laccase showed a high removal efficiency of crystal violet at an optimum pH of 5 and temperature ∼40 °C as well as an initial substrate concentration of 100 mg L−1. Compared with that of the individual support and the free laccase, the removal efficiency by an immobilized enzyme is far higher to confirm a synergy in the immobilized enzyme and support system.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2024
·
IF 6.3
Yingbing Zou,Kui Niu,Fubin Luo,Hongzhou Li
The development of metal oxide flame retardants that are easy to synthesize, efficient, and recyclable would be more beneficial to circular economy. In this work, a porous core-shell Mn 3 CoO x was developed to efficiently reduce heat, smoke as well as hazardous gas during the combustion of epoxy resin (EP). Compared with pure EP, the peak heat release rate (pHRR), total heat release (THR), peak smoke production rate (pSPR), total smoke production (TSP), peak CO production rate (pCOPR), and peak CO 2 production rate (pCO 2 PR) of EP/Mn 3 CoO x are reduced by 47.5 %, 21.5 %, 34.6 %, 17.6 %, 58.6 %, and 55.4 %, respectively. It has been shown that Mn 3 CoO x not only catalyzes the formation of high-quality char layer but also effectively catalyzes the conversion of hazardous gas products into CO 2 . Recovery experiments of Mn 3 CoO x filler in EP composites show that the recovery of Mn 3 CoO x can reach 90.0 %. This work provides insights into the design of efficient metal oxide flame retardants and ideas for the development of recycled flame retardants.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Xinyu Wang,Rui Li,Guoqing Zhao,Xiaorong Yan,Mingsheng Yang,Bei Wang,Haiping Yu,Mengxiao Li,Yuxin Hao,Zhihui Wang,Jingru Liu,Mingjun Hu,Jun Yang
Organic electrode materials are considered as a promising alternative to conventional transition metal-based electrodes because of their low cost, adjustable structure, high specific capacity, and good sustainability. However, many organic molecule electrodes and their corresponding discharge products can be easily dissolved in liquid electrolytes, leading to severe shuttle effect and performance decay. Here, we designed a separator with double carbon layer modification. The first layer is a B 4 O 7 2− cross-linked GO layer, which serves as a barrier to prevent organic small molecules from passing through the separator attributed to physical blocking and electrostatic repulsion. The second layer is a carbon nanotube layer, which mainly acts as an absorbing layer and upper current collector attributed to porous structure and good conductivity. The synergistic effect of double carbon layer enables the GO-B 4 O 7 2− @CNT-modified separator to effectively inhibit the shuttling of small molecules while maintaining their intrinsic electrochemical performance. Three soluble organic electrode materials with different molecular sizes, including 2,3,5,6-tetraamino-benzoquinone (TABQ), 9,10-anthraquinone (AQ), and 3,4,9,10-perylenetetracarboxylic diimide (PTCDI), were used as model molecules to validate the availability of modified separator, and the results shows that their cycling stability, specific capacity and rate capability were enhanced significantly after using the separator. Such simple cost-effective separator modification method will substantially promote the battery performance and facilitate the application of organic small molecule electrodes for energy storage.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Xue Wang,Guo Li,Hao Huang,Hongxiang Jin,Yangyingzhi Liu,Fan Yang,Rong He,Wenkun Zhu
Electrochemical uranium extraction in real nuclear wastewater containing ultrahigh concentration of F - is challenging, which requires the development of extraction material with highly exposed active sites for dominant uranyl complex species. Herein, we implant open active pairs of Cu + -SO x on an open flower-structured Cu-S-O nanosheets by pulse electro-oxidation, enabling the efficient electrochemical uranium extraction in real nuclear wastewater with F - . In this case, the open structure ensures the sufficient contact with electrolyte, together with the open active pairs selective binding with the dominant UO 2 F x species. In simulated nuclear wastewater, the open Cu-S-O nanosheets with open active pairs possessed an optimum extraction efficiency of 98.6 % in 300 min, which was 1.2-time larger than that of CuS nanosheets. Moreover, the Cu-S-O nanosheets maintained the remarkable efficiency regardless of the variation of pH, the interfering ions, and the ratio of U/F. The mechanistic study revealed an evolution of UO 2 F x adsorption, uranium reduction, and UO 2.34 crystallization. In real acidic nuclear wastewater from the fabrication of fuel element, the Cu-S-O nanosheets electrochemical extracted 95.6 % of the uranium, with a facile collection of the uranium oxide product.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Jianyun Yang,Yaoxing Xiang,Jisheng Xu,Chengxiang Shi,Lun Pan,Xiangwen Zhang,Ji-Jun Zou
Oxidative desulfurization (ODS) is a promising technology for removing sulfur compounds from fuel oil under mild conditions. This study prepared Ti/MCM-41 catalyst using a simple adsorption-hydrolysis-argon calcination method and applied it to ODS. Carbon introduced by tetrabutyl titanate (TBOT) and generated by calcination in inert atmosphere restrains the growth of TiO 2 , thereby promoting the formation of a high-activity Si-O-Ti structure. By using the optimal Ti/MCM-41 catalyst, desulfurization rate of model oil (dibenzothiophene dissolved in decalin, 500 ppm of sulfur) as high as 99.8 % was achieved at 40 °C with methanol as extractant and H 2 O 2 as oxidant (O/S = 4). After six recycles, the S removal rate was still 97.9 %. Reaction conditions like reaction temperature and extractant were carefully analyzed to explore the active structure and reaction mechanism, deducing that Si-O-Ti species promote the reaction probably by forming highly active bis-hydroperoxo Ti species with five-membered ring structure. Moreover, the promotion of methanol effect was found and reasonably explained. This work provides important guidance to the design of new catalysts, selection of extractant and optimization of oxidant for more efficient phase-transfer extractive and catalytic oxidation desulfurization (ECODS) process.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Li Song,Benzheng Zhou,Zhiyao Fu,Zhi Ye,Shaowei Ruan,Junjia He
Bi₂O₃ is a critical additive in ZnO varistor formulations and requires uniform distribution to optimize electrical performance. Surface coating technology enables the synthesis of ZnO@Bi₂O₃ core-shell particles, effectively mitigating the uneven distribution of Bi₂O₃ within the particles. Among the currently reported synthesis methods of ZnO@Bi₂O₃, there are significant variations in the selection of core material (ZnO source), and the coating effects obtained from different coating processes are highly inconsistent. Additionally, the characterization of coating structures remains scarce in the literature. This study proposes a novel synthesis route for ZnO@Bi₂O₃ particles, utilizing commercial nano-ZnO powder as the core material to ensure industrial quality standards for ZnO in production. Bismuth ions (Bi³⁺) are deposited via chemical precipitation to form the shell layer. Hydrothermal treatment strengthens the core-shell binding, facilitates phase transformation, and final calcination purifies the product to achieve the Bi₂O₃ phase. The effects of pH value and Bi³ ⁺/Zn²⁺ molar ratio were systematically investigated. Prepared ZnO@Bi₂O₃ core-shell structures were thoroughly characterized and analyzed using X-ray diffractometry (XRD), energy dispersive spectroscopy (EDS), and high-resolution transmission electron microscopy (HRTEM). The results indicate that the optimal coating performance is achieved when pH= 10.5 and the Bi³ ⁺/Zn²⁺ molar ratio is near 0.05, whereby the Bi₂O₃ phase forms uniform belt-like and spherical shells on the ZnO surface. This research integrates the common industry powder preparation techniques, including chemical precipitation, hydrothermal reaction, and calcination, to establish a foundational basis for the industrialization synthesis of ZnO@Bi₂O₃.
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高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 10
·1386-1389
·
IF 0.841
Chenhao Zhao,Jiangshui Luo,Zhibiao Hu
Seeking for the porous carbon with suitable structure and morphology has been a key to improve the lithium storage performance of carbon/selenium composite. In this work, the hierarchical porous N,O Co-doped carbon has been prepared by an initial hydrothermal carbonisation and subsequent activation route using the chitosan as raw material. The carbon obtained at 600°C possessing primary micropores and surface macropores presents high specific surface area (809. 3 m 2 g −1 ) and low porous size, and the selenium with amorphous structure is uniformly encapsulated into the micropores of this carbon to form carbon/selenium composite. As the cathode materials of lithium ion battery, this composite delivers a discharge capacity of 446.9 mAh g −1 at rate of 0.24 C after 100 cycles. At a high rate of 4.8 C, this composite still shows a stable discharge capacity of 342.8 mAh g −1 . These results suggest that this composite may be promising for practical applications for lithium-selenium battery.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Pengyu Li,Lin Li,Wenwen Wang,Yunping Han,Tianlong Zheng
Biotrickling filter achieved 95% o-xylene removal with EC of 35.36 g/(m 3 ·h). • Tax4Fun revealed 22.3% enrichment of xenobiotic pathways in biofilm community. • o-Xylene catabolic pathway reconstructed from activation to mineralization. • Biofilm deployed hierarchical meta-, ortho-, and gentisate dioxygenase strategies. In this study, gaseous o-xylene was removed using a laboratory-scale biotrickling filter packed with polyurethane foam cubes. The maximum elimination capacity of 35.36 g/(m 3 ·h) can be achieved at an inlet concentration of 0.89 g/m 3 , a flow rate of 0.25 m 3 /h, and an empty bed residence time of 76 s. The adsorption of o-xylene by the packing medium followed the Freundlich isotherm model, and approximately 64% of the o-xylene carbon was mineralized to CO 2 during steady-state operation, with the remainder utilized by microorganisms. Tax4Fun-based metabolic reconstruction revealed a 22.3% enrichment of xenobiotic biodegradation pathways in the biofilm community relative to the planktonic phase, with the xylene degradation pathway (ko00622) enriched 1.33-fold. The o-xylene catabolic pathway was reconstructed: upper-pathway methyl activation by toluene/o-xylene monooxygenase, nearly exclusive to the biofilm; ring cleavage through hierarchical dioxygenases spanning meta-, ortho-, and gentisate routes; and lower-pathway integration into the tricarboxylic Acid cycle (TCA). Pseudomonas , Mycobacterium , and Comamonas were identified as potential functional genera. The near-absence of anaerobic benzylsuccinate pathway enzymes exclusively aerobic degradation. Metabolism-related functions dominated the biofilm functional profile (75.02%). o-Xylene metabolism occurred predominantly on the packing-media biofilm rather than in the circulating solution, which indicated that enriching a metabolically specialized biofilm on high-surface-area porous packing is the key to efficient and stable performance. This study provides a scientific foundation for developing volatile organic compounds prevention and control strategies. Download: Download high-res image (211KB) Download: Download full-size image
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危险品化学品经营许可证（带存储）