Food Bioscience
·
2024
·
IF 4.8
Yuyang Zhang,Ting Feng,Xing Ni,Jiaojiao Xia,Hongbo Suo,Lishi Yan,Bin Zou
In this study, Candida rugosa lipase (CRL) was immobilized on the silica carrier SBA-15 by physical adsorption , then mixed with hydrophobically modified sodium alginate and dropped into calcium chloride solution. Finally, the adsorption-embedding immobilized lipase (L-SBA-15-Mgel) was successfully prepared. The conformation of the carrier before and after lipase immobilization were analyzed by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR) and other characterization techniques. The molecular docking and molecular dynamics simulation of CRL and modifier dodecyl glycidyl ether (DGE) ligand were carried out to analyze the potential influence of modifier on enzyme characteristics. The basic enzymatic properties including the activity, stability and reaction kinetic parameters of the immobilized lipase L-SBA-15-Mgel were studied. L-SBA-15-Mgel showed good storage stability and reusability. After 16 days of storage, the activity retention was 47.85%, and there was still 63.20% of the residual activity after seven cycles of reuse. The immobilized lipase was applied to the efficient synthesis of food flavor ester isoamyl acetate . Under the reaction conditions of 50 °C and 200 rpm, the highest yield of isoamyl acetate catalyzed by L-SBA-15-Mgel was 85.19%.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 9
·3753-3758
·
IF 0
Jing Ma,Jia Chu,Liangsheng Qiang,Juanqin Xue
Bi-doped TiO2/SBA-15 (Bi–TiO2/SBA-15) was synthesized by a wet impregnation method. It was found that SBA-15 retained its ordered hexagonal mesostructure after incorporation of TiO2 and Bi. TiO2 nanoparticles and Bi species dispersed well and anchored both in the channel and the wall of SBA-15. The photocatalytic activity was evaluated on photodegradation of Rhodamine B (RhB) under visible light irradiation (λ ≥ 420 nm). Experimental results indicated that Bi–TiO2/SBA-15 exhibited higher photocatalytic activities than pure TiO2 and TiO2/SBA-15 owing to the synergetic effects of Bi species and TiO2. The degradation of RhB by these catalysts follows the pseudo-first-order kinetic model and Bi–TiO2/SBA-15 (2.0%) was found to be the best. The effect of Bi doping on the photocatalytic activity was investigated by the density functional theory (DFT) method. The calculated results indicated that Bi doping could improve the photocatalytic activity by extending the spectral response from UV to the visible region, making the Bi–TiO2/SBA-15 active under visible light irradiation.
✓ 已验证
产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Hongran Zhao,Tong Zhang,Rongrong Qi,Jianxun Dai,Sen Liu,Teng Fei,Geyu Lu
Mesoporous silicas loading hydrophilic materials composites were widely used in humidity sensors during the last decade. However, the physical mixing process used for loading the hydrophilic materials in the channel of mesoporous silicas is hard to guarantee their uniform dispersion, and there is no strong force to bind the host and guest materials together. To solve above problems, novel vinyl functionalized mesoporous silicas (SBA-15-vinyl) were chemically modified with hydrophilic sodium p -styrenesulfonate (SSS) with free radical polymerization . The chemical and porous structures of the obtained hybrid materials (SBA-15-PSSx) were characterized by fourier transform infrared spectroscopy (FT-IR), elemental analyses (EA), X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and N 2 adsorption-desorption. The humidity sensing properties of the sensors based on SBA-15-vinyl and SBA-15-PSS indicate the introduction of PSS could effectively enhance the sensing properties of SBA-15-vinyl. The impedance of the optimized sensor changed by more than three orders of magnitude over the relative humidity (RH) range of 11%–95%, with rapid response to RH change.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Zhifeng Xu,Peihong Deng,Junhua Li,Siping Tang,Ying Cui
In order to improve the diffusion kinetics of molecularly imprinted materials (MIMs), applying imprinting technology to mesoporous materials is a promising strategy. In the present study, an imprinting approach based on the combination of mesoporous silica materials and molecular imprinting technology is reported. Molecularly imprinted material (MIM) for 2,4-dichlorophenoxyacetic acid (2,4-D) was prepared by using 2,4-D as the template molecule, alkyne-modified β-cyclodextrin and propargyl amine as the combinatorial functional monomers and SBA-15 as the supporter. The functional monomers were anchored to the azide-modified SBA-15 by azide–alkyne Click reaction. The synthesized MIM was characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), thermal gravimetric analysis (TGA), low-angle X-ray diffraction (XRD) and N 2 adsorption–desorption analysis. The interactions between template and functional monomers were studied by proton NMR analysis and UV–vis experiments. The results of the equilibrium binding experiments and selective tests showed that the prepared MIM has binding affinity and specificity for a group of analytes which have similar size and shape to those of template. Binding kinetic experiments demonstrated that the present imprinting approach can effectively enhance the mass transfer rate. The solid phase extraction of 2,4-D using MIM as the adsorbent was investigated. The extraction conditions for the processes of loading, washing and eluting were optimized. The recoveries of the molecularly imprinted solid phase extraction (MISPE) column for 2,4-D were 76.3–88.9% with relative standard deviations (RSD) of 3.48–7.64%.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 5
·2263-2270
·
IF 5.101
Qi Zheng,Yongheng Zhu,Jiaqiang Xu,Zhixuan Cheng,Huimin Li,Xinxin Li
Two new mesoporous SBA-15/organic hybrids featuring fluoroalcohol and fluorinated-phenol derivatives were successfully synthesized via a co-condensation route. Hexafluorobisphenol and hexafluoroisopropanol were chosen to graft onto mesostructured silica, respectively. The as-synthesized hybrids preserve their mesoscopic structures with relative large surface areas and pore volume, as confirmed by SAXS, TEM and N2 adsorption–desorption porosimetry. Moreover, FT-IR and solid-state MAS NMR spectroscopy proved covalent anchoring of the organic functional groups onto the SBA-15. In order to confirm the potential application of the hybrids in gas sensing, investigations on the sensing properties toward the nerve agent simulant dimethyl methylphosphonate (DMMP) were carried out by QCM transducer. The QCM sensors based on hybrid materials exhibit excellent sensitivity toward trace DMMP vapour down to 26 ppb. In comparison with pristine SBA-15, the hybrids also show remarkably enhanced selectivity to DMMP due to suitable H-bonding interactions. Therefore, the well-defined mesoscopic porosity of the organic–inorganic hybrids together with the grafted fluoroalcohol and fluorinated-phenol derivatives lead to excellent sensing properties to DMMP vapour, and show great potential in the area of nerve agent detection.
研究领域:
材料科学
·
化学传感器
·
无机化学
·
分析化学
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 3
·1343-1356
·
IF 1.5
Bi Dongxu,Cai Weiqian,Xiong Lingshan,Luo Qie,Wang Youqun,Zhang Zhibin,Xu Lin,Cao Xiaohong,Liu Yunhai
Three types of magnetic mesoporous silicas (MMSs), namely, MMCM-41, MMCM-48 and MSBA-15 were prepared by a hydrothermal method using CTAB and P123 as templates. The structure and physicochemical properties of MMSs were characterized by small angle XRD, VSM, ζ potential analyzer, contact angle measurer, and XPS, etc. The potential applications of MMSs in U(VI) recovery were thoroughly investigated. The adsorptive kinetics, thermodynamics, and selectivity of MMCM-41, MMCM-48 and MSBA-15 were compared. The results show that MSBA-15 revealed a high capacity for U(VI) (341.94 mg·g −1 ) and a superior selectivity than MMCM-41 and MMCM-48. The adsorption mechanism was explored by using the relevant adsorption models and XPS. The results indicated that MSBA-15 could be considered a strong candidate for the adsorption and recovery of U(VI) from radioactive wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
·
核技术
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Peng Dai,Lili Zhang,Guang Li,Zhaoqi Sun,Xiansong Liu,Mingzai Wu
Different loadings of SnO 2 nanoparticles embedded in mesoporous silica (SBA-15) were prepared via a two-solvent method with the ordered hexagonal mesoporous structure of SBA-15 kept. X-ray diffraction, transmission electron microscope, X-ray photoelectron spectroscopy and N 2 adsorption porosimetry were employed to characterize the nanocomposites. Compared with pure SnO 2 nanoparticles, the SnO 2 /SBA-15 nanocomposites show higher response to H 2 at lower operating temperature. The photocatalytic activity of as-prepared SnO 2 /SBA-15 for degradation of methylene blue was investigated under UV light irradiation and the results show that the SnO 2 /SBA-15 nanocomposites have higher photodegradation ability toward methylene blue than pure SnO 2 nanoparticles.
研究领域:
材料科学
·
纳米科技
·
环境催化
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2026
·
IF 3.3
Qiang Xian,Weijie Fan,Yulin Gu,Zishan Zhang,Jiaqi Liu,Hui Xian,Li Chen,Hui Dan,Yi Ding
New SnS@SBA-15 was developed for the efficient adsorption and storage of iodine. • The iodine adsorption capacity was up to 2062 mg/g. • The iodine adsorption mechanism was chemical adsorption (SnS + I 2 → SnI 4 + S). • The retention rate of adsorption product SnI 4 was up to 76.5% after storage for 90 d. • Stable iodine storage was due to the in-situ reconstructed hydrophobic environment. Tin-based materials are expected to be excellent iodine adsorbent, but the stability of the adsorption product (SnI 4 ) poses challenge. Herein, a novel strategy based on the in-situ reconstruction of hydrophobic environment was presented for efficient iodine adsorption and storage. Stannous sulfide@mesoporous silica (SnS@SBA-15) was developed and employed for the adsorption of I 2 gas. The optimal material, SnS@SBA-15–50wt%, exhibited an excellent iodine uptake of 2062 mg/g. The adsorption was attributed to a chemical reaction (SnS + 2I 2 = SnI 4 + S). Notably, the retention rate of SnI 4 was as high as 76.5% after storage in air for 90 days due to the in-situ reconstructed hydrophobic environment. The obtained SnS@SBA-15 exhibited efficient iodine adsorption and excellent storage ability. This work presents a novel strategy to design iodine adsorbents, aimed at addressing the storage challenges of iodine adsorption products susceptible to hydrolysis. Download: Download high-res image (214KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 17
·8391-8398
·
IF 3.3
Penghui Li,Huixiang Wang,Junhua Gao,Liancheng Wang,Jing Shi,Yu Meng,Junfen Li,Baoliang Lv
Supported tungsten oxide catalysts are promising candidates for olefin epoxidation with hydrogen peroxide (H2O2). Understanding the structure–activity relationship is of great importance for developing more efficient tungsten oxide-based catalysts. Herein, WO3–SBA-15 with an isolated tetrahedron WO4 is synthesized using a direct incorporation strategy, and its TOF is 191 h−1 in cis-cyclooctene epoxidation with H2O2, which is much higher than that of WO3/SBA-15 (51 h−1) prepared using an impregnation method and that of bulk-WO3 (0.4 h−1). Its lowest apparent activation energy of 34.6 kJ mol−1 also corresponded to the remarkable performance of WO3–SBA-15. Kinetic analysis indicated that WO3–SBA-15 bound H2O2 more strongly than other catalysts, resulting in the facilitated activation of H2O2. By correlating the specific activity and the structure characterization, we considered that the high reactivity of WO3–SBA-15 was attributed to (i) more isolated WO4 sites, which were of benefit to the coordination and activation of H2O2 and (ii) a stronger metal–support interaction derived from isolated WO4 species, which favored the dissociation of an O–O bond in the W–OOH intermediate and contributed to the insertion of an oxygen atom into an olefin double bond. Furthermore, DFT calculations indicated that the isolated tungsten oxide was beneficial for lowering the energy barrier of electrophilic oxygen atom transfer, thereby facilitating epoxidation.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 30
·75595-75609
·
IF 5.8
Jiang Mengyun,Xu Zhongjun,Zhang Tingting,Zhang Xirong,Liu Ying,Liu Peng,Chen Xiaochun
In this work, FeS supported SBA-15 mesoporous silica catalyst (FeS@SBA-15) was synthesized successfully, characterized and first applied to persulfate (PS) activation for the degradation of imidacloprid in wastewater. The as-prepared 3.5-FeS@SBA-15 presented an impressive imidacloprid removal efficiency of 93.1% and reaction stoichiometric efficiency (RSE) of 1.82% after 5 min, ascribed to the synergetic effects of improved FeS dispersion and abundant surface sites by SBA-15. Electron paramagnetic resonance spectra and quenching experiments proved that both SO 4 ·- and ·OH were produced in FeS@SBA-15/PS system, and SO 4 ·- played a dominant role in the degradation process. The S 2- can accelerate the cycling of Fe(III)/Fe(II) during activation and increase the steady-state concentration of Fe(II). More importantly, the constructed heterogeneous system exhibited an efficient and stable catalytic activity over a wide range of pH (3.0-9.0), temperature (283K-313K), inorganic ion (NO 3 - ) and humic acid (1-20 mg/L). Moreover, the density functional theory calculations were conducted to predict the potential reaction sites of imidacloprid. Based on eighteen identified intermediates, four main degradation pathways were proposed: hydroxylation, dechlorination, hydrolysis, and the ring cleavage of the imidazolidine. ECOSAR analysis indicated hydroxylation and dechlorination played a key role in the detoxification of the formed compounds. These findings would provide new insights into the application of FeS@SBA-15 catalyst in wastewater treatment and the removal mechanism of imidacloprid from wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Lidan Deng,Qiao Chen,Xingmao Jiang,Xiaowei Liu,Zheng Wang
Propane dehydrogenation is a promising way to produce propylene . Catalysts with high propane conversion, selectivity to propylene , and stability are vital to this technology. In this work, we determined that the catalytic performance of Pt/SBA-15 can be significantly enhanced by introducing an appropriate amount of indium . A too low ratio of In/Pt (1/8) or too high of a ratio (2/1) is detrimental to the activity of the catalyst. When the nominal ratio of Pt to In is 1/1, the initial propane conversion and selectivity towards propylene over 1Pt1In/SBA-15 are highest among all catalysts tested at 57.06 % and 99.04 %, respectively. The conversion rate decreased to 39.63 % after 28 h of reaction, but selectivity was retained at greater than 99 %. Very little coke was deposited on the used 1Pt1In/SBA-15 catalyst. With catalyst characterization, it was proposed that Pt 1 In 1 alloy nanoparticles with surface-enriched In 2 O 3 were responsible for the selective dehydrogenation of propane.
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Songlin Wang,Nan Jiang,Qiying Zhang,Huabo Li,Hongying Niu,Tong Chen,Gongying Wang
Methyl phenyl carbonate (MPC) is one of the versatile carbonates; in particular, it is an important component in lithium-ion batteries. In recent years, the catalytic synthesis of MPC has become an important topic, but the development of highly active catalysts is still challenging. In this study, SBA-15-loaded nano-sized Pb–Bi catalysts with different Pb/Bi molar ratios were prepared by deposition–precipitation to improve the efficiency and selectivity. To investigate the relationship between the structure and performance of the catalysts, XRD , BET, SEM-EDS, HRTEM , H 2 -TPR, and XPS characterization, as well as catalytic activity and stability tests, were conducted. Results revealed that Pb–Bi/SBA-15 can efficiently catalyze the synthesis of MPC under solvent-free conditions, with the highest catalytic activity obtained over 6 Pb–1Bi/SBA-15. SBA-15 with a large pore size and a high specific surface area was suitable as catalyst carrier, and the average diameter of Pb–Bi oxide particles was ∼3.57 nm. The addition of Bi led to the improved dispersion of active components, which were highly and evenly dispersed on the SBA-15 surface. Furthermore, an appropriate proportion of Pb and Bi on SBA-15 was conducive to the considerable enhancement of the catalytic activity. Besides, Pb–Bi/SBA-15 also exhibited good durability and recyclability, making it a promising catalytic material for the synthesis of various carbonates.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）