CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shuilai Qiu,Fanghe Su,Yifan Zhou,Yuntao Li,Xin Wang,Laibin Zhang
Currently, designing an efficient and broadly applicable (suitable for foams, wood, steel, plastic) fire-retardant coating remains a significant challenge. This work introduces a multi-scale micro-nanostructured hybrid fireproof coating. The composite features basic fillers that include ceramic glass microspheres, while its interior comprises an inorganic aerogel made from nano black phosphorus and silicon dioxide nanofibers for reinforcement, with a phosphorus-containing acrylic polymer serving as the base. Upon exposure to elevated temperatures, the coating’s surface transforms into a solid char layer resembling scale armor, effectively functioning as a robust fire barrier to protect the underlying substrate. The coating treated rigid polyurethane foam achieved an exceptionally high Limiting Oxygen Index of 45 %, outperforming comparable products. In terms of flame retardancy and smoke suppression, this innovative coating significantly reduces Peak Heat Release Rate (50.3 %) and Total Smoke Production (54.9 %). Notably, it exhibits rapid self-extinguishing capabilities within seconds during butane flame tests at temperatures exceeding 1100 °C, demonstrating remarkable resistance to high-temperature flames. This research offers a straightforward methodology for developing high-performance fireproof coatings, with promising applications across various industrial settings.
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高影响因子
FOOD CHEMISTRY
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2019
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IF 5.399
Meilin Xu,Lu Ran,Ning Chen,Xiaowei Fan,Dabing Ren,Lunzhao Yi
Choline chloride-based deep eutectic solvents (DESs) were used as green alternatives to conventional organic solvents for extracting valuable flavonoids from citrus peel waste. The effects of viscosity, pH, and polarity of DESs on the extraction efficiency were investigated. Results revealed linear dependence of extraction yield of citrus flavonoids on the polarity of the hydrogen bond donor (HBD). To simultaneously and effectively extract polymethoxylated flavonoids (PMFs) and glycosides of flavonoids (GoFs) with different polarities, five ternary DESs were designed and prepared by combining the effective HBD components. Among the tailor-made DESs studied, choline chloride–levulinic acid– N -methyl urea showed the highest extraction yield of total flavonoids. Under optimized extraction conditions, 18.75 mg/g PMFs and 47.07 mg/g GoFs were extracted from citrus peel with recoveries of 95.87% and 86.32%, respectively. This study presents a useful strategy based on tailor-made DESs to selectively extracted value-added flavonoids from waste peels in the citrus-processing industry.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Chundi Zhou,Minghao Sui,Yali Guo,Songhang Du
Efficiently removing hexavalent chromium (Cr(VI)) using iron-based adsorbents under neutral pH conditions continues to pose a challenge. In this study, we constructed nano zero-valent iron (nZVI) supported by carboxylated multi-walled carbon nanotubes (OCNT) composites with iron-based dual active sites through the nitrilotriacetic acid modification (FOC-NA). The acid dissolution experiment, high-resolution transmission electron microscopy (HRTEM), thermogravimetric analyzer (TGA), X-ray photoelectron spectroscopy (XPS), and Raman analysis proved these active sites consisted of iron-carboxylate complex (−COOFe(II)) and OCNT-confined nZVI (Fe 0 -in-OCNT). The existence of iron-based dual active sites enhanced electron transfer efficiency in Cr(VI) removal under neutral pH conditions. This leaded to a superior adsorption capacity for Cr(VI), as evidenced by a maximum adsorption capacity of 141.29 mg·g −1 at a pH of 6.5. Meanwhile, the formation of a Cr-containing product (−COOFe-O-Cr) on the surface of FOC-NA substantially hindered the re-release of chromium into the environment. Furthermore, this study proposed the significant involvement of active hydrogen atoms (H*) in the reduction of Cr(VI), as confirmed by quenching experiments and analyses using electron spin resonance (EPR), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The formation pathway and energy barrier of H* and the −COOFe-O-Cr complex were analyzed by density functional theory (DFT) calculations. This study provided insights for the rational design of iron-based adsorbents with dual active sites to facilitate the activation of H* for Cr(VI) reduction under neutral pH conditions.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yunpeng Wen,Xihong He,Tao Kang,Kun Gu,Si Di,Linbo Li,Yaru Cui
The efficient and sustainable metal recovery from spent Li-ion battery (LIBs) cathode materials is crucial for environmental protection and resource security. During the hydrometallurgical recovery process, the cathode materials must be separated from the current collector (Al foil) before leaching the metals. However, current separation and leaching processes are conducted separately, resulting in cumbersome process flows and significant reagent consumption. To address these issues, a ternary deep eutectic solvent (DES) composed of choline chloride, malonic acid and 2-pyrrolidone was used in this study for the simultaneous separation and leaching of LiCoO 2 cathode material. The DES achieved a separation efficiency of over 98 wt% for the cathode materials, with leaching efficiencies exceeding 96 % for Li and Co and less than 4 % for Al. The cathode material was separated from the Al foil through disruption of the molecular chains of the PVDF binder. During the leaching process, Co 3+ in LiCoO 2 was reduced to Co 2+ by malonic acid and existed in the form of [CoCl 4 ] 2- . The Li and Co in the leachate were recovered as carbonate and oxalate precipitates, respectively, allowing for the reuse of the DES after metal recovery. Solvent reusability tests indicated that the DES maintained an excellent performance after multiple cycles. This study provides a novel and environment-friendly strategy for the efficient recycling of metals from spent lithium-ion batteries.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Chenyuan Zhang,Qiang Liu,Hailong He,Xinyu Guo,Shuang Yang,Lei Zhang,Lei Wang
The use of deep eutectic solvents (DESs) has been demonstrated as an effective method for treating heavy metal-enriched biomass. However, the variations in the mechanisms of biomass deconstruction observed across different types of DESs, coupled with the challenges associated with ’biomass recalcitrance’, have made it difficult to design the efficient DESs. This study aimed to investigate the impact of different types of DESs on the removal efficiency of Cd from phytoremediation biomass and to understand the mechanism of Cd during the treatment using chemical quantitative analysis, micro-imaging and micro-spectroscopy technologies. The findings revealed that acidic DES exhibited superior removal efficiency compared to neutral and alkaline DES. Following treatment with ChCl:LA at 90 ℃ for 1 h, only 7.4% of the original Cd content remained in pulp. Moreover, an increase in the treatment temperature from 25 ℃ to 120 ℃ resulted in a reduction in residual Cd in the pulp from 60.5% to 6.6%. Multiscale analysis demonstrated that Cd in poplar primarily accumulates in the compound middle lamellae and secondary wall. During pretreatment, a portion of the Cd initially dispersed into the liquid phase alongside the dissolution of components such as hemicellulose. The subsequent deformation of the cell wall facilitated the penetration of DES, which enabled the formation of complexes between the heavy metals and the solvent through coordination and proton exchange. These complexes were then transferred to the liquid phase. The findings provide valuable scientific insights for the design of solvents for the safe disposal of phytoremediation biomass in a sustainable way.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Ronghao Liu,Jun Li,Xiaoxia Liu,Xiaolu Yin,Yanzhao Yang
The escalating disposal of lithium-ion batteries (LIBs) poses significant environmental challenges but also offers substantial opportunities for resource recovery. In this work, we introduce a recycling strategy using a green, cost-effective ternary deep eutectic solvent (DES) composed of guanidine hydrochloride, ethylene glycol, and maleic acid. The DES can achieve >99.5 % leach efficiency of lithium (Li) and cobalt (Co) at 100 °C, 9h, and L/S=50. The kinetic study found that the chemical reaction rate at the interface was the key to controlling the leaching process. The study of leaching mechanisms found that the acidity and coordination ability of DES were the main driving forces of leaching. Co loaded in the DES phase can almost precipitate out by using oxalic acid, achieving the separation of Li and Co. After reusing three times, the maximum load of Li in the DES phase reached 4.1 mg/g. These outstanding performances, along with the avoidance of the use of hazardous chemicals and the reduction of high costs, confirmed that the DES possesses a promising prospect for sustainable, large-scale application in efficiently leaching valuable metals from LiCoO 2 .
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ACS Catalysis
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2024
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IF 11.3
Hang Yu,Shanjun Mao,Bing Lu,Hao Wang,Xie Zhang,Menghui Qi,Ruiliang Gao,Yong Wang
Multicomponent reactions such as ammoxidation are highly desirable for chemical synthesis. The complicated reaction network and catalytic active sites involved, however, make it rather challenging for extensive structure–performance relationship investigations and subsequent rational design of an efficient catalyst. In this work, efficient VOx/TiO2 catalysts with concise components and exquisite structure design demonstrated 95% selectivity at 98% conversion under 2070 h–1 for 3-picoline ammoxidation. After clarifying that the oxidative dehydrogenation process is rate-limiting, we assumed that the abundance of reactive surface lattice oxygen at the interface of vanadium–titanium is the key to high productivity and suppression of oxidation side reactions since low reaction temperature is beneficial for enlarging the difference in rates of different energy barriers. In addition, rather than applying the traditional neutralization method with alkaline components, in situ formed V2O5 crystallite was subtly to cover the strong acid sites on VOx/TiO2 catalysts in that the strong adsorption of pyridine nitrogen in 3-cyanopyridine on strong acid sites can lead to severe hydrolysis side reactions.
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高影响因子
ACS Catalysis
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2025
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IF 13.1
Qiuyan Chu,Yanpu Niu,Haolan Tao,Honglai Liu,Quan Li,Cheng Lian,Jingkun Li
Iridium-based electrocatalysts are the most promising candidates for the acidic oxygen evolution reaction (OER). Considering their high cost and scarcity, it is imperative to maximize atom utilization and enhance the intrinsic activity of iridium. In this work, IrOx sub-2 nm clusters are stabilized on TiO2 supports via metal support interaction (MSI) induced by vacancy defects in TiO2. The strength of MSI is readily tuned by the type of vacancies: oxygen vacancies in TiO2 (VO-TiO2) induce the adsorbed MSI with relatively weak strength, while titanium vacancies in TiO2 (VTi-TiO2) lead to the strong embedded MSI. The tunable MSI further modulates the electronic structure of IrOx sub-2 nm clusters. IrOx/VO-TiO2 with adsorbed MSI exhibits an optimized electronic structure with a downshifted d-band center of IrOx, resulting in a reduced binding energy with oxygen and a low energy barrier of the rate-determining step for OER. Consequently, IrOx/VO-TiO2 delivers an activity twice that of commercial IrO2 and a good stability for 120 h in a practical proton exchange membrane water electrolyzer. Our study provides a guideline for the rational design of acidic OER catalysts based on modulating the electronic structure of IrOx sub-2 nm clusters via tunable MSI.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Ziqi Liu,Xingjia Yin,Naidong Xiao,Xiaoqiong Wan,Jinlong Hu,Yumei Hua,Guanglong Liu,Jianwei Zhao
Submerged macrophytes have important impacts on the denitrification and anaerobic ammonia-oxidizing (anammox) processes. Leaf damage in these plants probably changes the rhizosphere environment, affecting organic acid release and denitrifying bacteria . However, there is a lack of comprehensive understanding of the specific changes. This study investigated these changes in the rhizosphere of Potamogeton crispus with four degrees of leaf excision. When 0 %, 30 %, 50 % and 70 % of leaves were excised, the concentrations of total organic acid were 31.45, 32.67, 38.26, and 35.16 mg/L, respectively. The abundances of nirS -type denitrifying bacteria were 2.10 × 10 10 , 1.59 × 10 10 , 2.54 × 10 10 , and 4.67 × 10 10 copies/g dry sediment, respectively. The abundances of anammox bacteria were 7.58 × 10 9 , 4.59 × 10 9 , 3.81 × 10 9 , and 3.90 × 10 9 copies/g dry sediment, respectively. The concentration of total organic acids and the abundance of two denitrification microorganisms in the rhizosphere zone were higher than those in the root zone and non-rhizosphere zone. With increasing leaf damage, the number of OTUs in the Pseudomonas genus of nirS- type denitrifying bacteria first increased and then decreased, while that of the Thauera genus was relatively stable . The overall increase in the OTU number of anammox bacteria indicated that leaf damage promotes root exudates release, thereby leading to an increase in their diversity. The co-occurrence network revealed that the two denitrification microorganisms had about 60.52 % positive connections in rhizosphere while 64.73 % negative connections in non-rhizosphere. The abundance and community composition of both denitrification microorganisms were positively correlated with the concentrations of various substances such as oxalic acid , succinic acid , total organic acids and NO 2 - -N. These findings demonstrate that submerged plant damage has significantly impacts on the structure of denitrification microbial community in the rhizosphere, which may alter the nitrogen cycling process in the deposit sediment. Synopsis This study reveals leaf damage of macrophyte changed the rhizosphere denitrification microbial community , which is helpful to further understand the process of nitrogen cycle in water.
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PubMed
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Shijin Xiong,Xiaoyan Xu,Tonghao Du,Qiaozhen Liu,Tao Huang,Hongbing Ren,Tao Xiong,Mingyong Xie
Laotan Suancai, a popular traditional Chinese fermented vegetable , is manufactured in the industry via four fermentation rounds. However, the differences in flavor quality of Laotan Suancai from the four fermentation rounds and the causes of this variation remain unclear. Metabolome analysis indicated that the different content of five taste compounds and 31 aroma compounds caused the differences in flavor quality among the variated fermentation rounds of Laotan Suancai. Amplicon sequencing indicated that the microbial succession exhibited a certain pattern during four fermentation rounds and further analysis unveiled that organic acids drove the microbiota shift to more acid-resistant populations. Spearman correlation analysis highlighted that seven core microbes may be involved in the formation of differential flavor and the corresponding metabolic pathways were reconstructed by function prediction. Our findings offer a novel perspective on comprehending the deterioration of flavor quality across the fermentation rounds of Laotan Suancai.
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PubMed
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Huifang Wu,Qiqi Wang,Miaochen Dong,Xinyue Liu,Yanfeng Tang
Accurate and rapid monitoring of organophosphorus pesticides (OPs) residues is crucial for regulating food safety. Herein, dual-emission carbon dots (de-CDs) were fabricated for the ratiometric detection of OPs and Hg 2+ . The de-CDs exhibited two emission peaks at 678 and 485 nm when excited with visible light. Interestingly, the fluorescence at 678 nm was significantly quenched by Hg 2+ mainly because of the static quenching effect, whereas that at 485 nm exhibited a slight change. More significantly, the quenched fluorescence of the de-CDs recovered remarkably after introducing omethoate , diazinon and malathion . Accordingly, the ratiometric detection of the three OPs and Hg 2+ was achieved with high selectivity and robust performance. In addition, the OPs residues assay in Brassica chinensis was successfully performed with satisfactory results. This study not only provides an attractive tool for the simple and rapid assay of OPs but also offers new insights into the fabrication of multi-functional carbon dots .
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shaoning Wang,Xinyu Cheng,Enqing Zhu,Tianqi Li,Lili Zhang,Yimin Fan,Zhiguo Wang
3D-printable information-storage expansion materials can integrate multilevel optical information within one carrier, which requires higher requirements for their mechanical properties. Cellulose nanofiber (CNF) is an attractive candidate for enhancing the mechanical properties of composite materials. However, CNF composites generally increase stress at the expense of strain by physical compounding of CNF. Herein, a physical and chemical double-cross-linked (DC) network of cellulose nanofiber/poly(deep eutectic solvent)(CNF/PDES) conductive elastomers are prepared by introducing glycidyl methacrylate (GMA) through nanofibrillation, derivatization modification, and in-situ polymerization in the oxalic acid/choline chloride (OA/ChCl) DES system. The carboxylation modification of OA-CNF could provide active cross-linking sites, and derivatization modification of GMA was shortened from 4 to 0.5 h under the catalysis of ZnCl 2 . DC OA-CNF/PDES conductive elastomers were rapid polymerization within 30 s and significantly improved the stress and strain simultaneously (stress: 252.51 kPa to 417.53 kPa, strain: 262.29% to 419.44%), and excellent 3D printable accuracy and formability for information encryption, and information-storage expansion. Subsequently, we systematically compared the feasibility and difference of OA/ChCl, lactic acid/choline chloride (LA/ChCl), maleic acid/choline chloride (MA/ChCl), and propanedioic acid/choline chloride (PA/ChCl), and provide a promising route for 3D-printable high-performance flexible sensors and information-storage expansion under DES systems.
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高影响因子
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