Catalysis Science & Technology
·
2022
·Vol. 12
·期 22
·6827-6837
·
IF 6.177
Penghui Li,Junhua Gao,Jing Shi,Huixiang Wang,Xiangying Xing,Jingzhao Ren,Yu Meng,Liancheng Wang,Baoliang Lv
Linear terminal olefin epoxidation is a significant oxidation reaction for the synthesis of valuable industrial intermediates. As typical olefin epoxidation catalysts, supported tungsten oxides are rich in oxygen vacancies, which have been investigated for improving catalytic performance in other reactions, but the influence on olefin epoxidation is rarely studied. Herein, a series of WO3−x/SBA-15 catalysts with different oxygen vacancy concentrations were obtained by impregnation and sequent hydrogen reduction at 300–600 °C. Their catalytic performances for 1-hexene epoxidation with hydrogen peroxide at 70 °C were studied. It was found that an appropriate concentration of oxygen vacancies could improve epoxidation (the epoxide productivity increased from 135 to 196 μmolepoxide gW−1 min−1) and reduce the apparent activation energy (from 51.6 to 46.9 kJ mol−1). The oxygen vacancies are also beneficial for cycloolefin and other linear olefin epoxidation. In particular, the productivity of cyclooctene oxide was promoted from 4161 to 5744 μmolepoxide gW−1 min−1. This promotion effect was attributed to the increase in the number of Lewis acid sites caused by introducing moderate oxygen vacancies, which could improve the activation of hydrogen peroxide and facilitate epoxidation. In situ FT-IR spectroscopy and density functional theory calculations further indicated that increasing the oxygen vacancies contributes to reducing the energy barrier of the transfer of electrophilic oxygen atoms in active intermediate W–OOH to 1-hexene, thereby promoting epoxidation.
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JOURNAL OF NUCLEAR MATERIALS
·
2019
·
IF 2.547
Hui Dan,Qiang Xian,Li Chen,Tianheng Xiong,Zhengdi Jiang,Facheng Yi,Yi Ding
Mesoporous ammonium molybdophosphate/SBA-15 (AMP/SBA-15) was considered as an excellent adsorbent to remove Cs + from radioactive wastewater. However, AMP/SBA-15 obtained from two-step method suffers from poor stability and low reuse ability. Herein, we reported a facile one-step method to fabricate AMP/SBA-15 using Phosphomolybdic acid (PMA) as acid media. The effect of PMA content on the properties of the resultant AMP/SBA-15 was investigated in detail. And the Cs + adsorption performance of the developed AMP/SBA-15 adsorbents was also evaluated. It was found that the PMA content had a strong influence on the structure and morphology of AMP/SBA-15. The mesoporous structure order of the AMP/SBA-15 decreased with increasing PMA content. The AMP particles were mainly incorporated into the framework of SBA-15. Furthermore, the AMP incorporation rate obtained from one-step method is much higher than that of two-step method. The developed AMP/SBA-15 with AMP in the framework of SBA-15 exhibited good stability and high reuse ability for the removal of Cs + .
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FUEL
·
2019
·
IF 5.128
Li Gao,Zhiyuan Shi,Ubong Jerome Etim,Pingping Wu,Wei Xing,Yi Zhang,Peng Bai,Zifeng Yan
A composite material Beta-SBA-15 (BS) comprising zeolite Beta units and SBA-15-like mesoporous structure was hydrothermally synthesized and served as catalyst support for the hydroisomerization of n-heptane. Materials were characterized by a variety of techniques. Characterization results revealed that Beta-SBA-15 composite has a two-dimensional hexagonal mesoporous channel with a pore size of 6.4 nm and a high concentration of moderate-strength acid sites. Evaluation results showed that Pt/HBS exhibited a relatively high n-heptane conversion (75.57%) with a good selectivity to isoheptanes (90.04%), resulting in the highest isoheptanes yield (68.04%) among all samples. The micro-mesoporous composite structure with moderate surface acidity enhanced diffusion of large isomerized intermediates as well as inhibiting the occurrence of cracking side reactions, achieving a high isoheptanes yield. Experimental data demonstrates that the indexed isomerization factor (IIF) as a performance descriptor can accurately predict the isomerization performance of catalysts.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jiasheng Zhou,Xiaoxin Zhou,Kunlun Yang,Zhen Cao,Zheni Wang,Chuchen Zhou,Shams Ali Baig,Xinhua Xu
Iron-manganese binary oxides (FeMnO x ) can remove contaminants from aqueous solutions with high efficiency, and mesoporous silica (SBA-15) is widely used as a supporting material due to its large specific surface area and good stability. In this study, SBA-15 was used to support FeMnO x in the synthesis of a novel arsenic (As) adsorbent (FeMnO x /SBA-15), and its characteristics under different reaction conditions, such as pH, temperature, presence of competing ions, and humic acid, were tested. The results showed that the contaminant adsorption efficiency of the novel adsorbent was better than that of bare FeMnO x , as the addition of SBA-15 decreased the agglomeration effect of FeMnO x . Additionally, FeMnO x /SBA-15 underwent calcination to further enhance its performance. The state of iron and manganese in FeMnO x /SBA-15 and the corresponding arsenic removal efficiency were improved by calcination at 350 °C with an FeMnO x /SBA-15 mass fraction of approximately 45%. Almost 90% of As (50 mL, 5.0 mg L −1 ) could be removed by 0.2 g L −1 of FeMnO x /SBA-15 (mass ratio of 45% and calcination temperature of 350 °C). The FeMnO x /SBA-15 could regenerate and still be used after four consecutive cycles. The high As sorption capacity, ability to regenerate, and reusability of FeMnO x /SBA-15 confirmed that this adsorbent is promising for treating As-contaminated drinking water.
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Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Biao Lu,Zhaowei Wu,Lijuan Ma,Xia Yuan
Phosphotungstic acid (HPW) was immobilized on a sulphonic-acid-functionalized SBA-15 mesoporous molecular sieve through a one-step hydrothermal synthesis method, using non-ionic surfactant pluronic P123 as a structure-directing agent in acidic media, tetraethoxysilane (TEOS) as a silicon source and 3-trimethoxysilyl-1-propanethiol (MPTMS) with hydrogen peroxide (H 2 O 2 ) oxidized to a sulfonic acid group. The obtained composite material HPW-SBA-15-SO 3 H has a high specific surface area, large pore volume and increased strong acidity. The effect of raw-material ratio on the catalyst was investigated. Catalysts that were prepared under optimal conditions of a molar ratio of (MPTMS)/ (MPTMS + TEOS) of 1:10, a molar ratio of (H 2 O 2 )/(MPTMS) of 18:1 and a mass ratio of (HPW)/(TEOS) of 1:10 exhibited an excellent catalytic activity in the esterification reaction of cyclohexene with formic acid. The cyclohexene conversion exceeded 86.7% and the cyclohexyl formate selectivity was 98.1% after 6 h at 353 K with a mole ratio of cyclohexene to formic acid of 1:3 and a catalyst dosage of 5.7% (w/w). The composite catalyst had a higher catalytic stability than the sulfonic-acid-functionalized SBA-15 and SBA-15-immobilized HPW individually. The cyclohexene conversion reached 72.0% even after reused four times. Fourier transform infrared and temperature-programmed desorption of ammonia revealed that a strong interaction existed between the sulfonic-acid group and the HPW, which prevented acid-active component of HPW and sulfonic-acid group loss from the carrier.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Yan Liu,Jian Qiu,Yinhua Jiang,Zhanchao Liu,Minjia Meng,Liang Ni,Changchun Qin,Jianbo Peng
Ce(III) ion-imprinted polymer (Ce(III)-IIP) grafted on Fe 3 O 4 nanoparticles supported by SBA-15 mesopores microreactor was successfully synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization for selective removal of Ce(III) from aqueous solution. The characterization results suggest that the surface ion-imprinted polymer (IIP) synthesized by RAFT is a thin layer. Adsorption isotherm experiments indicated that Redlich-Peterson isotherm model best fitted the experimental data and the adsorption capacity of IIP was obviously higher than that of non-imprinted polymers (NIP) at the same conditions. The kinetics of adsorption followed the Thomas model. Moreover, competitive adsorption studies illustrated that Ce(III)-IIP offers the advantages of selectivity towards Ce(III) compared with NIP even in the presence of other metal ions. All above results indicated the potential application of Ce(III)-IIP for selective removal of Ce(III) from aqueous solution.
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RSC Advances
·
2017
·Vol. 7
·期 6
·3443-3449
·
IF 3.108
Ying Duan,Min Zheng,Dongmi Li,Dongsheng Deng,Cuicui Wu,Yanliang Yang
The Pd/SBA-15 catalyst was synthesised through the reduction of PdCl2 by the surface-bonded vinyl group on vinyl-functionalized SBA-15, which was prepared via co-polymerization. XRD and XPS characterization confirmed the successful reduction of Pd(II) to Pd(0). Pd/SBA-15 showed a narrow palladium particle-size distribution of about 5–6 nm in the TEM image. The Pd/SBA-15 catalyst was effective for the hydrogenation of aromatic nitro compounds with zero-order kinetics, and the TOF for the hydrogenation of nitrobenzene was 1124 h−1 at 313 K and 1 atm H2. A steric effect was observed for the substituted nitroarenes.
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COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 293
·期 1
·109-123
·
IF 2.41
Liu Yan,Chen Rui,Yuan Dandan,Liu Zhanchao,Meng Minjia,Wang Yun,Han Juan,Meng Xiangguo,Liu Fangfang,Hu Zhaoyong,Guo Wenlu,Ni Liang,Yan Yongsheng
Highly thermal-responsive magnetic Sr(II)-imprinted polymer (Sr(II)-TMIIP) was successfully synthesized as a potential effective adsorbent for selective removal of Sr(II) in aquatic environments. First, magnetic polyethyleneimine-loaded mesoporous SBA-15 (Fe 3 O 4 @PEI-SBA-15) was prepared via a simple polymer-mediated self-assembly method. Then, the surface of Fe 3 O 4 @PEI-SBA-15 was endowed with reactive vinyl groups through modification with 3-(methacryloyloxy)propyl trimethoxysilane (MPS). With the aid of vinyl groups, free radical polymerization of N -isopropylacrylamide (NIPAM), methacrylic acid (MAA), and N , N ′-methylenebisacrylamide (BIS) in the presence of Sr(II) was performed with 2,2′-azobisisobutyronitrile (AIBN) as initiator, which provided a desired imprinted layer coating onto Fe 3 O 4 @PEI-SBA-15. The as-prepared Sr(II)-TMIIP was characterized by Fourier transmission infrared spectra (FT-IR), X-ray diffractometer (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), UV, and N 2 adsorption–desorption techniques. The results showed that the Sr(II)-TMIIP exhibited thermal stability, temperature and magnetic sensitivity ( M
s = 10.34 emu/g), and ordered mesoporous structure. Batch mode adsorption studies were conducted to investigate the specific binding kinetics, adsorption equilibrium, and selective recognition ability of Sr(II)-TMIIP. Adsorption equilibrium experiments showed that the adsorption amount strongly depended on temperature and reached a maximum around the lower critical solution temperature (LCST). Regeneration experiments indicated that repeated adsorption and desorption by temperature swings were possible. Compared with the nonimprinted polymer (NIP), the Sr(II)-TMIIP had good temperature response and excellent selectivity and reusability, making it possible in applying for Sr(II) separation and controlled release.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiao Dan Sun,Zhangxin Duan,Jingjing Song,Hanxing Yang,Kai Yan,Zhenhua Tian,Dangge Gao,Jianzhong Ma
Carcinogen Cr(VI) is reduced efficiently into Cr(III) by a photocatalyst, but the produced Cr(III) is difficult to transfer from the photocatalytic active site. The “two birds with one stone” strategy is proposed to realize the in situ growth of ZnIn2S4 nanoplates on SBA-15 and the creation of separated active sites, in which ZnO loading on the porous SBA-15 nanorod was used as a zinc source. Obtained samples ZnIn2S4/SBA-15 (ZIS/SBA) showed the redshift of the absorption band and better separation of photoinduced carriers than pristine ZnIn2S4, due to its smaller size and S defect. All of the Cr(VI) was reduced to Cr(III) by the ZIS/SBA sample during the photocatalytic process, which was 2 times higher than pristine ZnIn2S4. Moreover, 92.8% of Cr(III) was adsorbed simultaneously during photocatalysis due to the electrostatic interaction from SBA-15. In addition, the ZIS/SBA sample showed good recycling stability after 5 times cycles, providing a new strategy for the in situ growth of ZnIn2S4 on the surface of porous materials and a novel way for the simultaneous removal of Cr(VI) and Cr(III) during photocatalysis.
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Foods
·
2026
·Vol. 15
·期 7
·1185
·
IF 6
Ming-Yue Zhong,Ya-Zhu Xiao,Qing-Qi Guo,Xin-Huai Zhao
In the present study, Shuidong mustard (Brassica juncea) produced in Maoming City, Guangdong Province, was fermented at 25 °C for 15 days, using wild microorganisms and 20 g/kg table salt in water. The results showed that this fermentation endowed Shuidong mustard with acid production via utilizing reduced sugar as the fermentation substrate, causing the fermented Shuidong mustard to have a decreased pH value and increased total titratable acidity. Partly as the result of NaCl usage or fermentation, the fermented Shuidong mustard had enhanced NaCl or ash contents, decreased contents in nitrite/nitrate, vitamin C, total phenols, and total carotenoids, and altered textural features reflected as reduced hardness, chewiness, springiness, and fracturability. Moreover, 90 volatile compounds, including 2-butyl, 3-butenyl, isobutyl, and ethyl isothiocyanates, were detected in the fermented Shuidong mustard after the 15-day fermentation, while 21 members comprised 95% (w/w) of total volatiles. Additionally, the analysis results revealed that the microorganism community of fermented Shuidong mustard was structured at respective phylum, genera, or species levels byFirmicutesandProteobacteria, orLactiplantibacillus,Enterobacteriaceae,Lactococcus, andPediococcus, orLactiplantibacillus,Enterobacteriaceae,Pediococcus, andLactococcus. It is thus concluded that this explored fermentation induced both acid production and, more importantly, compositional and textural changes in Shuidong mustard, which had production potential at an industrial scale as part of a healthy diet because these bioactive compounds include isothiocyanates, polyphenols, and carotenoids. Overall, this study focused on the Shuidong mustard fermentation using 20 g/kg table salt to fill a research gap in low-salt fermentation, showing its significance by providing a scientific basis for product development.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Siyu Zhou,Wanni Liu,Dongqi Liu,Xian Shi,Kai Huang,Feng Jiang,Hui Gao,Haian Xia,Ying Guan,Siquan Xu
Efficient catalytic conversion of cellulose into 5-hydroxymethylfurfural (HMF) remains challenging and arouses concern. In this study, iron phosphate (FePO 4 ) was embedded into the SBA-15 mesoporous silica matrix as an available active phase via ultrasound-assisted implantation, and then the abundant silanol nests were utilized to graft sulfonic acid groups to construct an innovative FeP@SBA-15-S catalyst. Through a systematic analysis of the characteristics of crystal, texture, element valence, acidity, hydrophilicity, etc., it was reflected that FeP@SBA-15-S catalyst gave the active FePO 4 component porosity and exhibited bifunctional acidity. Without pretreatment and other acid additives, FeP@SBA-15-S catalyzed cellulose under optimal conditions provided a desired HMF yield of 52 %. More meaningfully, the cellulose and hemicellulose components in native wheat straw could be catalyzed simultaneously by FeP@SBA-15-S catalyst, yielding 61 % HMF and 60 % furfural in one-pot. The cyclability evaluation showed that the FeP@SBA-15-S catalyst still had considerable activity after six continuous runs, with a slight loss in activity attributed to the leaching of active components and pore coverage. A clear catalytic pathway was summarized by GC-MS and 13 C NMR spectrum as cellulose undergoing glucose monomer ring opening, isomerization to fructose, fructose ring closure and final dehydration, and the by-products were also detected as mainly C 3 -C 23 fragments and oligomers.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 325
·期 2
·673-682
·
IF 1.137
Liu Bing,Jia Yongzhong,Jing Yan,Zhang Quanyou,Shao Fei,Yao Ying
Abstract The lithium isotope separation (LIS) plays a vital role in development of nuclear industry. The liquid–liquid extraction technologies open up new possibilities for LIS. This work presents preliminary results of the study on the extractions and separation of 6 Li/ 7 Li by mixed system, comprising amino-derivatives of benzo-15-crown-5 (4AB), ionic liquid and anisole. 4AB was used as an extractant. The eparation factor ( α ) is 1.031 ± 0.001, and abundance of 6 Li in loaded organic phase is 7.76%. Meanwhile, the reason why 4AB has better separation efficiency than B15C5 was explored brief by Fourier transform infrared (FT-IR) spectrum and quantum chemical calculations. Graphic abstract
研究领域:
核工业
·
化学工程
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危险品化学品经营许可证（带存储）