MOLECULES
·
2024
·Vol. 29
·期 16
·3856
·
IF 4.2
Xiaoxue Liu,Lanfen Zhang,Jian Hu,Wei Zhang,Xiaorong Xiang,Huiqing Cheng,Li Qin,Hao Li
In recent years, TiO2-based catalysts have received extensive attention from researchers for their excellent oxidative desulfurization (ODS) performances. In this paper, a series of mesoporous TiO2/SiO2catalysts with different TiO2loadings are prepared, using an incipient wetness impregnation method with agricultural waste rice husk as both the silicon source and mesoporous template and tetrabutyl titanate as the titanium source. The effect of different TiO2loadings on the ODS performance of the samples is investigated, and the appropriate TiO2loading is 2.5%. Compared with pure TiO2, the 2.5%TiO2/SiO2sample exhibits high catalytic activity for oxidative desulfurization. This is, on the one hand, due to the high specific surface area and mesopore volume of the 2.5%TiO2/SiO2sample. On the other hand, it is due to the uniform dispersion of TiO2grains with an average diameter of 6.1 nm on the surface of the mesoporous SiO2carrier, which greatly increases the active sites of the 2.5%TiO2/SiO2sample, thus improving the catalytic activity of the sample. The recycling performances of the 2.5%TiO2/SiO2sample are further investigated. The results show that, after fifteen cycles, the 2.5%TiO2/SiO2sample still maintains high conversions of dibenzothiophene (99.8%) and 4,6-dimethyldibenzothiophene (99.7%) without deactivation. In addition, the 2.5%TiO2/SiO2sample treated with TBHP aqueous solution is characterized by the technique of UV-Vis, and the Ti-peroxo (Ti-OOtBu) species, the active intermediate for the ODS of bulky organic sulfides, is successfully captured. Finally, a possible reaction mechanism for the ODS process over the 2.5%TiO2/SiO2sample is proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wen Xu,Shiwen Dong,Haijun Cheng,Stefanos Giannakis,Xiaohui Lu,Zhiqiao He,Da Wang,Shuang Song,Jun Ma
Mixed refractory organic wastewater containing both organic molecular and nanoparticle contrast agents poses a significant challenge for wastewater treatment. In this study, heterogeneous catalytic ozonation (HCO) technology was employed, creatively using the nanoparticle contrast agent Mn 3 O 4 /SiO 2 /C as a catalyst for the degradation of the organic molecular contrast agent iopamidol (IPM). This study aims to provide new insights and approaches to address the challenge of mixed contrast agent treatment in medical wastewater through a “treat-waste-with-waste” strategy. Mn 3 O 4 /SiO 2 /C exhibited an excellent IPM degradation efficiency, reaching 99.3 % within 30 min, compared with only 9.6 % IPM removal in the absence of catalyst ([cat] = 0.1 g L −1 , [IPM] 0 = 5 μM, [O 3 ] 0 = 3 mg L −1 , at pH 6.8 and 278 K). The Mn 3 O 4 , SiO 2 , and C in Mn 3 O 4 /SiO 2 /C were extensively integrated, and the proportion of Mn(II) in Mn 3 O 4 /SiO 2 /C was 39.9 %, as compared to 33.1 % in Mn 3 O 4 , which facilitated the generation of hydroxyl radicals. The siloxide and carbonaceous materials in Mn 3 O 4 /SiO 2 /C provided abundant sites for ozone adsorption and pollutant enrichment, promoting interfacial ozone contact with pollutants and subsequent catalytic reactions. The presence of structures such as Mn-O-Si and Mn-O-C in the material helps accelerate electron transfer, thus promoting electron capture and ozone decomposition. This strategy provides new insights for refractory pollutant elimination and serves as a guide for advancing green catalysis in water purification.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiang-Tao Xuan,Hui Zhang,Hong-Li Wang,Jia-Le Yao,Jun Xu,Qiu-Ling Che,Yi Wang
Superhydrophobic textiles based on cellulose, a key biological macromolecule, are highly desirable for applications in extreme environments. In this study, we develop a multifunctional cellulose-based cotton fabric ( Gossypium hirsutum L.) by applying a facile one-step hydrothermal coating method, integrating covalent organic frameworks (COFs), silica nanoparticles (SiO 2 ), and perfluorooctyltrichlorosilane (POTS) onto the fiber surface to form a robust CF-COF/SiO 2 /POTS composite coating. The hierarchical micro/nanostructure modifies the cellulose surface, achieving a water contact angle of 155.4 ± 0.9° and a sliding angle of 7.9 ± 0.7°. Modern analytical techniques, including Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy, confirm the molecular interactions between cellulose and the coating, revealing enhanced surface stability. The coated cellulose fabric exhibits robust chemical stability across acidic (pH 2), alkaline (pH 12), and saline (1 mol/L NaCl) conditions, mechanical durability after 50 adhesion-peeling cycles, five laundering cycles, and 820 h of sunlight exposure, and effective anti-icing behavior with reduced ice adhesion and rapid superhydrophobicity recovery post-icing (−18 °C, 12 h) via mild heating (60 °C, 5 min). Notably, the fabric undergoes an irreversible color change under UV–visible irradiation (300–1100 nm, 133.4 mW/cm 2 ), with spectroscopic analyses indicating photochemical oxidation of hydroxyl groups, yet retaining superhydrophobicity. This work presents a novel strategy for functionalizing cellulose-based textiles, offering durable self-cleaning, anti-icing, and photochromic properties for applications in protective clothing, outdoor gear, and anti-counterfeiting systems.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xianhua Hou,Miao Zhang,Jiyun Wang,Shejun Hu,Xiang Liu,Zongping Shao
A high yield and low-cost high-energy wet ball milling method is used for producing nano-flake Si@SiO 2 as an anode material for Li-ion batteries. After a two-step ball milling (coarse milling and fine milling) process, the irregular plate-like micrometric Si (average particle size is 27.4 μm) is fractured into nano-flake Si@SiO 2 (average particle size is 154.8 nm) with small crystalline grains and abundant grain boundaries. Due to the significant changes of the prepared nano-flake Si@SiO 2 in the surface composition, particle size and crystal structure, the ball milled Si shows better electrochemical performance compared with the as-received micrometric Si. And the fine milled Si shows the best electrochemical properties with a high initial coulombic efficiency of 84.6% and a specific capacity of 1920.4 mA h g −1 at a current density of 100 mA g −1 after 100 cycles.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yun Wu,Yanqun Yang,Ming Wen,Jing Xie,Linchun Bao,Shuting Yang,Xiangming Luo,Xingyi Wang,Qianchun Zhang
Monoamine neurotransmitters play vital roles in cognitive and various physiological and pathophysiological processes, but their trace levels, small sample volumes, and complex biological matrices in biological samples pose significant analytical challenges. This study developed a novel method for the simultaneous quantification of six monoamine neurotransmitters—tyrosine, vanillylmandelic acid, tryptophan, 3,4-dihydroxyphenylacetic acid, 5-hydroxyindole-3-acetic acid, and homovanillic acid—in human serum and urine. The method utilizes magnetic solid-phase extraction coupled with ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). A multifunctional magnetic composite, polyethylenimine@polymer dopamine hydrochloride@NH 2 -MIL-53(Al)-SiO 2 @Fe 3 O 4 , was synthesized, exhibiting high extraction selectivity and capacity and achieving an extraction range of 9.61–25.4 nmol/mg for the target neurotransmitters. The analytical method, optimized for the aforementioned composite, exhibited robust linearity for all six monoamine neurotransmitters, with correlation coefficients ( R 2 ) exceeding 0.998. The limits of detection (S/N = 3) ranged from 1.1 to 22 ng/L, indicating high sensitivity. Recovery rates for the targeted analytes varied between 94.5 % and 112 %, and relative standard deviations remained within the range of 1.5–9.4 %. These findings confirm that the developed methodology is sensitive, accurate, selective, and reliable for the quantitative determination of trace monoamine neurotransmitters in complex biological samples.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.7
Shiyao Lu,Shuning Li,Yancheng Wu,Lin Cheng,Huanyu Li,Miao Wang,Meisheng Liang,Qiaoyan Li
Simultaneous elimination of CO and NO x remains a formidable challenge, largely due to the competitive oxidation reactions present in industrial emission streams. Although much prior research has concentrated on enhancing performance at low temperatures, limited catalytic activity in O 2 -containing environments has recently gained attention as a pressing issue. Herein, we developed an Ir/Si 2 Ce 1 O x catalyst via a SiO 2 -induced structural regulation strategy, which promotes the fine dispersion of CeO 2 and enables the strong anchoring of Ir species. This rational design facilitates the preferential exposure of the active Ir 0 (111) crystal plane, a key factor associated with optimized surface adsorption behavior. Furthermore, the abundant Ir-O-Ce interfaces in this unique architecture induce significant electron transfer from Ce to Ir, thereby stabilizing the metallic Ir 0 . Concurrently, the activated lattice oxygen at the Ir-O-Ce interfaces facilitates the formation of the key nitrate intermediates. Consequently, the catalyst demonstrates outstanding NO reduction and CO oxidation efficiency at 250 °C under oxygen-containing conditions. Our findings highlight a viable approach for stabilizing Ir 0 through tailored Ir Ce interactions, offering a pathway to robust CO-selective catalytic reduction (CO-SCR) performance in an oxidative environment.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2015
·
IF 2.729
Miaomiao Tian,Yongcun Zou,Shaoyan Zhou,Tianpeng Wang,Xueju Lv,Qiong Jia
Novel magnetic adsorbents based on Fe 3 O 4 /SiO 2 /poly(acrylamide- N , N' -methylene bisacrylamide) magnetic microspheres modified with non-ionic triblock copolymer surfactant were successfully prepared as a magnetic solid phase extraction adsorbent for the determination of trace natamycin in jam samples. The adsorbent was characterized by scanning electron microscopy, transmission electron microscopy, Fourier transformed infrared spectroscopy, vibrating sample magnetometer, and X-ray diffractometer analysis, confirming that Pluronic L64 was effectively functionalized on the magnetic materials. Various experimental parameters affecting the extraction capacity were investigated including adsorbent amount, extraction time, desorption time, sample pH, and ionic strength. For recovery evaluations, the jam samples were spiked at two concentration levels of 100 and 200 μg kg −1 of natamycin and the recovery values were in the range of 78.8–93.4%. The relative standard deviations (RSD) for the recoveries were less than 3.5%. The novel magnetic solid phase extraction method provided several advantages, such as simplicity, low environmental impact, convenient extraction procedure, and short analysis time when used for natamycin analysis.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 19
·5211-5220
·
IF 3.125
Zhou Qingxiang,Zheng Zhenwen,Xiao Junping,Fan Huili,Yan Xiuyi
In this work, polyethyleneimine grafted silica-coated nanoscale zero valent iron (Fe@SiO 2 @PEI) has been successfully synthesized and was investigated to be an effective adsorbent for efficient enrichment of five phthalate esters such as diphenyl phthalate, dibenzyl phthalate, butyl benzyl phthalate, diphenyl isophthalate, and dicyclohexyl phthalate (DPP, DBP, BBP, DPIP, and DCHP) from environmental water samples. The structure and morphology of the materials were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction(XRD). The parameters that influenced the enrichment performance such as amount of sorbent, sample pH, type of eluent, volume of eluent, salting-out effect, adsorption time, and desorption time were investigated. Under optimal conditions, excellent linear relationships were found in the concentration range from 0.5 to 100 μg L −1 , the limits of detection ( S / N = 3) were in the range of 0.26–0.45 μg L −1 , and the intra-day and inter-day precisions ( n = 6) were in the range of 3.7–4.8 and 3.2–4.3 %, respectively. The developed method was evaluated with real water samples, and satisfied spiked recoveries in the range of 99–104 % were achieved. The experimental results proved that Fe@SiO 2 @PEI had good adsorption for phthalate esters, and would be a good adsorbent for the magnetic solid-phase extraction of important pollutants from environmental water samples. ᅟ A flowchart of the synthesis of polyethyleneimine grafted silica coated nanoscale zero valent iron (Fe@SiO 2 @PEI) and the process of the developed magnetic solid phase extraction of phthalate esters before the analysis by high performance liquid chromatography
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International Journal of Smart and Nano Materials
·
2016
·
IF 0
Yin Jia,Haiyan Wang,Kesong Tian,Ruifei Li,Zhaopeng Xu,Jiao Jiao,Ling Cao,Yuehao Wu
SiO2-based microcapsules containing hydrophobic molecules exhibited potential applications such as extrinsic self-healing, drug delivery, due to outstanding thermal and chemical stability of SiO2. However, to construct SiO2-based microcapsules with both high encapsulation loading and long-term structural stability is still a troublesome issue, limiting their further utilization. We herein design a single-batch route, a combined interfacial and in-situ polymerization strategy, to fabricate epoxy-containing SiO2-based microcapsules with both high encapsulation loading and long-term structural stability. The final SiO2-based microcapsules preserve high encapsulation loading of 85.7 wt% by controlling exclusively hydrolysis and condensed polymerization at oil/water interface in the initial interfacial polymerization step. In the subsequent in-situ polymerization step, the initial SiO2-based microcapsules as seeds could efficiently harvest SiO2 precursors and primary SiO2 particles to finely tune the SiO2 wall thickness, thereby enhancing long-term structural stability of the final SiO2-based microcapsules including high thermal stability with almost no any weight loss until 250°C, and strong tolerance against nonpolar solvents such as CCl4 with almost unchanged core-shell structure and unchanged core weight after immersing into strong solvents for up to 5 days. These SiO2-based microcapsules are extremely suited for processing them into anticorrosive coating in the presence of nonpolar solvents for self-healing application.
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Molecular Catalysis
·
2017
·
IF 0
Xueliang Cui,Yunfeng Zheng,Meng Tian,Zhengping Dong
In this study, magnetic SiO 2 @Fe 3 O 4 @m-MnO 2 microspheres with uniform morphology and mesoporous MnO 2 shell were successfully prepared. The MnO 2 sheets structured mesoporous shell could provide a large specific surface area, thereby increasing the catalytically active sites. Thus, magnetic SiO 2 @Fe 3 O 4 @m-MnO 2 microspheres were used as a catalyst support. Palladium nanoparticles (Pd NPs) were successfully anchored with high dispersion on SiO 2 @Fe 3 O 4 @m-MnO 2 surface, successfully obtained Pd(6%)/SiO 2 @Fe 3 O 4 @m-MnO 2 nanocatalyst with a Pd weight percentage of 6%. The obtained nanocatalyst was employed in the hydrodechlorination of highly toxic 2,4-dichlorophenol and catalytic reduction of the widely used nitroaromatics and organic dyes under ambient conditions. In these catalytic reactions, the Pd(6%)/SiO 2 @Fe 3 O 4 @m-MnO 2 nanocatalyst with large and accessible pore surface area exhibited excellent catalytic activity as compared to other noble metal supported catalysts. The Pd(6%)/SiO 2 @Fe 3 O 4 @m-MnO 2 nanocatalyst could also be easily and conveniently recovered from the reaction mixture by using an external magnet, attributed to its magnetism, thus preventing the catalyst loss. Moreover, it could also be reused for at least six times without significant decrease in the catalytic activity, indicating its excellent reusability and stability. This study provides a useful platform and a new perspective for fabricating mesoporous MnO 2 microspheres based noble metals modified catalysts for environmental catalysis.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Shan Cheng,Nan Li,Bing Wang,Fangyuan Hu,Lishuai Zong,Haoyue Hao,Qingguang Bao,Cheng Liu,Yousi Chen,Xigao Jian
A GO-SiO 2 hybrid interface layer was prepared by electrostatic adsorption to synergistically improve the weak interface bonding between carbon fiber (CF) and poly(phthalazinone ether ketone) (PPEK). FTIR, Raman and XPS confirmed that GO-SiO 2 interface layer is constructed on CF surface. SEM and AFM indicated that the synergistic effect of GO-SiO 2 could obviously improve the CF surface roughness. CF-GO-SiO 2 /PPEK composite exhibits excellent interlaminar shear strength (84.2 MPa), flexural strength (1620 MPa), storage modulus (132.9 GPa) and T g (285 °C). The GO-SiO 2 interface layer improves the mechanical interlocking and wettability between CF and PPEK, and the failure mechanism of the composite changes from interfacial debonding for Untreated CF/PPEK composite to matrix cohesive destruction and fiber breakage for CF-GO-SiO 2 /PPEK composite. Moreover, the layer is beneficial to the hydrothermal ageing resistance of the composite. This study provides a promising strategy for improving the interfacial properties of advanced thermoplastic composites.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Bingbing Liu,Yubi Wang,Li Zhang,Bei Zhang,Jia Wang,Yuanbo Zhang,Guihong Han
Ferrites with a typical AB 2 O 4 structure are excellent soft magnetic material precursors . One progress for preparation of manganese ferrite is to use the minerals as raw materials. However, the inclusive impurities, such as Ca and Si, may dope in the AB 2 O 4 structure and have an adverse effect on the magnetism of ferrites. In this work, the effects of CaO and SiO 2 on the crystalline structure transformation, interfacial elements distribution, and magnetism change of the MnO 2 -Fe 2 O 3 -CaO-SiO 2 system for preparation of high-performance ferrite materials were systematically investigated. It's found that Ca ions can readily be doped in the sit A of spinel-type structure to form Ca a Mn b Fe 2 O 4 , and the magnetism of manganese ferrite was observably declined due to the Ca doping. A diffusion couple of synthetic Ca a Mn b Fe 2 O 4 and SiO 2 was designed to determine the Ca migration. Results demonstrated that regulation of Ca out of sit A from the spinel-type structure can be successfully realized via adjusting the CaO/(CaO + SiO 2 ) mass ratio below 0.55, and the magnetism of ferrite after Ca migration was obviously enhanced. The migrated CaO combined with SiO 2 to form calcium silicate which was distributed at the boundaries of ferrite particles. Eventually, the verification test of low-grade manganese ores with CaO and SiO 2 impurities was conducted to validate the Ca migration effect.
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