CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Haiyan Kang,Yulong Luo,Chaopeng Liu,Zhongxian Song,Chaohai Wang,Xu Yan,Mengxia Ma,Xiaole Yan,Deming Gu,Yanli Mao
The recovery of Au(III) by adsorption has attracted extensive attention since it promotes solving the problems of environmental pollution and resource waste. Herein, we prepared the functionalized MCM-41 (MCM-NH 2 -OH) and explored the synergistic adsorption effects for Au(III). The adsorption capacity of MCM-NH 2 -OH reached 1664.9 mg·g −1 , which was 15.98 times and 2.99 times higher than MCM-NH 2 (104.2 mg·g −1 ) and MCM-OH (556.0 mg·g −1 ), respectively. The fitting kinetics experiments demonstrated that Au(III) adsorption by MCM-NH 2 -OH was conformed to the pseudo-second-order kinetic model. The adsorption rate of MCM-NH 2 -OH (2.62 × 10 -2 g·mg −1 ·min −1 ) was 346.1 times higher than MCM-NH 2 (7.57 × 10 -5 g·mg −1 ·min −1 ). The adsorption mechanism and the role of –NH 2 and –OH groups were investigated by XPS, XRD, and FTIR. More Au(III) can be adsorbed on –NH 2 groups by electrostatic attraction and chelation that provided electron acceptor for –OH groups, which further enhanced the reduction of Au(III) to Au(0). Further, MCM-NH 2 -OH exhibited superior selectivity and reusability for Au(III). Therefore, the synergy between –NH 2 and –OH groups is suitable for efficient adsorption-recover of gold applied in actual wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 72
·期 1
·106-113
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IF 1.547
Cui Liru,Lin Huiming,Guo Wei,Xiang Di,Zhou Dan,Zhang Ting,Qu Fengyu
With well bioactive and nontoxic, hydroxyapatite (HAp) was employed to seal the nanopores of mesoporous silica (MCM-41) to realize the pH-responsive controlled release. First, MCM-41 was modified with cationic polymer, poly-(diallyldimethylammoniumchloride) (PA). And after the addition of Ca 2+ /PO 4
3− , HAp precipitation can take place based on the cationic sites derived from PA. It is a simple and effective way to obtain HAp coating MCM-41 system (MHAs). The structure of the system was characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, N 2 adsorption–desorption and so on. Metformin hydrochloride was used as the model drug, and the drug release performance and the release kinetics of the system were investigated in detail. Because of the degradation of HAp under acid condition, the drug loading MHAs showed a well pH-sensitive controlled release behavior. From above investigation, MHAs is a promising platform to construct a pH-responsive controlled drug delivery system, especially for some low pH tissues, such as inflammatory and tumor.
研究领域:
材料科学
·
药学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Xia Wang,Wulan Zeng,Mingjun Song,Fengli Wang,Xiude Hu,Qingjie Guo,Yongzhuo Liu
To accomplish efficient CO 2 capture from coal-fired power plants, the polyetheramine of poly(propylene glycol)bis(2-aminopropyl ether) (A), with high electron cloud density, was codispersed with tetraethylenepentamine (TEPA) to prepare solid amine sorbents. The effects of the mass ratio of TEPA to A and adsorption temperature, as well as CO 2 adsorption isotherms, were investigated. The regeneration, adsorption and desorption kinetics for TEPA-functionalized MCM-41 before and after A codispersion were also studied. A improved the adsorption performance of TEPA-functionalized MCM-41 not only at 60 °C, but also at lower temperatures. When the mass ratio of TEPA to A was 50% to 10%, the breakthrough time and equilibrium adsorption capacity were 14 min and 3.58 mmol/g, respectively, at 30 °C, and 12 min and 3.09 mmol/g, respectively, at 60 °C, values that are significantly better than the values for TEPA-functionalized MCM-41. The adsorption heat of co-functionalized MCM-41 was approximately 11–13 kJ/mol in the temperature range of 30–50 °C, showing a typical physisorption characteristic. In addition, CO 2 -TPD results indicated that co-functionalized sorbent showed faster desorption rate and lower regeneration energy consumption. After ten regenerations, the equilibrium adsorption capacity was 2.93 mmol/g, representing 94.8% of the fresh sorbent capacity.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
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2020
·
IF 3.421
Peijing Shao,Han Chen,Qin Ying,Shihan Zhang
In order to fulfill the application of carbonic anhydrase (CA) in the carbon dioxide capture process, immobilization technology will be used to enhance the stability of the enzyme. The structure of the support for the enzyme immobilization is important to determine the enzyme activity and stability. In this work, mesoporous molecular sieves with different dimensions and pore sizes were used as supports for the immobilization of CA. Characterization analysis indicated that the carrier material retained its integrity after enzyme immobilization. The half-life (t1/2) of CA/KIT-6, CA/SBA-15, and CA/MCM-41 increased to 3.0, 2.8, and 2.0 times compared to the free CA enzyme. Additionally, the experimental results showed that when using SBA-15 with a two-dimensional structure and a large pore size as the carrier, the CA enzyme loading was high and retained 78% relative activity and 98% initial activity after 6 days at 40 °C. Comprehensively, CA/SBA-15 was more suitable for capturing CO2 in flue gas than CA/MCM-41 and CA/KIT-6.
研究领域:
生物化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
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2020
·
IF 7.216
Tao Jiang,Peng Lu,Meng-Jiao Xu,Jian-Dong Lin,Yong-Mei Liu,Yong Cao,He-Yong He
We describe herein that the quasi-one-dimensional confinement effect of functionalized nanoporous supports is particularly advantageous for boosting formic acid (FA) dehydrogenation efficiency over palladium nanoparticles (NPs). Benefiting from their unique structural merits that lead to significant lowering of the entropic barrier for FA activation, the Pd NPs interiorly located on the amino-modified MCM-41 offer the promise of more than an order of magnitude speedup of the initial activity in H 2 production from FA over their exterior analogs. Under mild and additive-free conditions, ultrafine Pd NPs confined in amino-modified MCM-41 channels exhibit an initial turnover frequency as high as 46,677 h −1 and a turnover number up to 1,060,000 at 60°C. In conjunction with the enhancement and robust performance for efficient regeneration of FA via CO 2 hydrogenation, the presented approach greatly contributes to the development of FA-based hydrogen storage and related technologies as viable means of enabling sustainable future energy prospects.
研究领域:
化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 3
·1383-1395
·
IF 4.912
Mengmeng Wang,Lincai Peng,Xueying Gao,Liang He,Junhua Zhang
An integrated catalytic protocol involving dehydration, transfer-hydrogenation and alcoholysis towards one-pot conversion of xylose to alkyl levulinate was invented using a combination of Zr(20)-MCM-41 and H3O40PW12 catalysts. Secondary alcohols like 2-propanol and 2-butanol as the reaction medium exhibit equally superior hydrogen donating capability, but the dehydration step of xylose in 2-butanol is preferred probably due to its stronger hydrophobicity. A good alkyl levulinate yield of 53% can be achieved under optimized conditions. The spent dual catalysts can be effectively recovered and they exhibit good reusability after thermal regeneration of Zr(20)-MCM-41. Research on the catalytic mechanism shows that well-dispersed ZrO2 supported on MCM-41 is responsible for the catalytic transfer hydrogenation step of furfural to furfuryl alcohol. Proper tuning of the Lewis and Brønsted acidities can efficiently promote the acid-driven reaction steps of xylose conversion and simultaneously inhibit the alkyl levulinate-to-γ-valerolactone side reaction. The sustainability of this conversion is greatly improved by process intensification based on the new catalytic strategy and mild reaction conditions.
研究领域:
生物化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Yangxian Ou,Tao Zhang,Li Lv,Wenxiang Tang,Shengwei Tang
CO 2 hydrogenation is one of the reactions to realize effective utilization of CO 2 , while Cu-Zn based catalyst is widely adopted for CO 2 hydrogenation to value-added chemicals like methanol. However, this process is less efficient since the poor performance of catalyst due to its poor dispersion or sintering issue. In this study, three kinds of SiO 2 supports (SBA-15, MCM-41 and Nano-SiO 2 ) with different porous structure were conducted to load same amount of 5.0 wt% Cu-ZnO active component (the molar ratio of Cu/Zn is 2.0), which were further applied for CO 2 hydrogenation. All catalysts were characterized chemically, morphologically and structurally by different techniques such as XRD , BET, TEM , H 2 -TPR and CO 2 -TPD. The results showed that the structure of three catalysts was basically preserved and the surface aera kept stable after loading active component, while the active component had the best dispersion when SBA-15 was used as the support and space-time yield of methanol is about 705.6 g MeOH •kg Cu −1 •h −1 ,which is higher than that of Nano-SiO 2 -5% (532.9 g MeOH •kg Cu −1 •h −1 ) and MCM-41–5% (213.2 g MeOH •kg Cu −1 •h −1 ). Due to the confined effect of mesoporous channel structure provided by SBA-15 support, the Cu-Zn interaction could be significantly enhanced with increasement of medium and strong alkaline sites, further improving CO 2 activation ability. This work provides a useful strategy to improve the catalytic efficiency of classical Cu-Zn catalyst for the CO 2 hydrogenation process.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lurong Ge,Yaohui Feng,Yanjun Dai,Ruzhu Wang,Tianshu Ge
Composite sorbents with hygroscopic salts (like LiCl and CaCl 2 ) impregnated porous matrixes obtained special attention in the past years, especially for solid desiccant dehumidification. However, the drawback of strong corrosivity limited their practical implementation. Alternatively, ionic liquid (1-ethyl-3-methylimidazole acetate) with less corrosivity is confined into ordered mesoporous MCM-41 to fabricate composite sorbent in this study, overcoming the poor mass transfer or limited adsorption capacity of single sorbent. Comprehensive characterizations including SEM, TEM, XRD, FTIR and N 2 adsorption prove that the ionic liquid is encapsulated in ordered channels of MCM-41. Sorption isotherms and kinetics indicate that the composite sorbent has superior water sorption performance (0.5 g/g at 20 °C/70 % RH), fast sorption rate under wide humidity range and potential of low temperature-driven regeneration. Moreover, the leakage test and corrosion experiment reveal that the composite sorbent has long-term stability and is corrosion-free to metal components. Further, the dehumidification performance using desiccant coated heat exchanger with reported composite sorbent is evaluated, showing 5 times higher dehumidification capacity than that of MCM-41 and 2 times higher than traditional silica gel (typical ARI summer, 35 °C, 40 % RH). This study identifies a feasible way of using ionic liquids to develop energy-efficient, safety-ensured and low-cost composite sorbents for water sorption-related applications.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INSTRUMENTATION SCIENCE & TECHNOLOGY
·
2016
·
IF 0.525
Fei Wu,Ting Li,Xiu Ru Yang,Cheng Ming Li,Mei Qiang Fan,Kangying Shu
Cobalt boride nanoparticles were deposited on the surface of Mobil Crystalline Material 41 (MCM-41) and the catalytic activity for sodium borohydride hydrolysis was characterized. The transition from cobalt boride particle to cobalt boride layer was evaluated, and the catalytic activity of cobalt boride was improved because of the MCM-41. The catalytic activity increased with the cobalt boride/MCM-41 mass ratio from 1:4 to 1:1. A cobalt boride/MCM-41 mass ratio of 1:1 provided high catalytic activity similar to cobalt boride. Sintered measurements showed that the catalytic activity was from amorphous cobalt boride and not from crystalline cobalt boride. Sintering resulted in the conversion of amorphous cobalt boride to crystalline cobalt boride and damaged the nanostructure of the amorphous cobalt boride framework.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Qianrui Zeng,Yang Yang,Jie Shi,Qingxin Guan,Jia Li,Wei Li
Limited cells and growth factors, insufficient mechanical properties, and the hypoxic status in defect areas are the severe challenges faced by bone tissue engineering (BTE) scaffolds, currently. In this work, a 3D printable composite scaffold (Gel-MCM-41-CaO 2 ) without cells or growth factors is designed to promote vascularized bone regeneration through sustained release of oxygen and bioactive ions, utilizing a 1D tube encapsulation release technology to achieve slow release of oxygen from both ends of MCM-41-CaO 2 . Calcium silicate is used as a cross-linking agent and a bioactive agent to cross-link with sodium alginate, combined with polyacrylamide to form a hybrid double network, which endows the hydrogel with excellent compressive strength and 3D printable properties. Based on amounts of data in vitro and in vivo, the oxygen and silicon ions released from this hydrogel scaffold can promote cell proliferation and differentiation, upregulate the expression of osteogenic and angiogenic-related genes, and promote angiogenesis and osteogenesis. This work presents a strategy for fabricating BTE scaffolds without the need for cells or growth factors, with the potential to be applied in clinical bone regeneration and repair.
研究领域:
组织工程
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材料科学
·
再生医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yu-Hua Wu,Yu-Long Ma,Yong-Gang Sun,Wen-Xin Ji,Feng Lin,Yi-Peng Yang,Li-Juan Ma,Chun-Hong Zhu,Yi-Jie Xu,Qing Miao
The development of synthetic methods to obtain high value-added mesoporous Al-MCM-41 from a low-cost silicon-aluminum source with low toxicity is an active research topic in solid waste resource utilization. In particular, the controlled synthesis of MCM-41 with a two-level pore distribution is a challenging task. In this work, the synthesis of unimodal and bimodal mesoporous Al-MCM-41s was achieved using acids with different degrees of ionization from coal gasification fine residue (CGFR) as bulk solid waste generated by the coal gasification process. We determined that the degree of acid ionization affected the self-assembly of inorganic/organic species as well as condensation processes , resulting in some changes of the hexagonal mesoscopic structure. The unimodal mesoporous Al-MCM-41 with acetic acid HAc and bimodal mesoporous Al-MCM-41s with an inorganic acid environment (HCl, HNO 3 or H 2 SO 4 ) could be effectively prepared in a controllable manner by the silicon and aluminum source obtained at alkali dissolution time 6 h and crystallization conditions at pH 10.5 and 383 K in 72 h. Moreover, the synthesis of Al-MCM-41-HAc with different SiO 2 /Al 2 O 3 molar ratios (18–89) could also be realized by different alkali dissolution times. And alkali dissolution time (2–24 h) and the crystallization conditions (pH 4.5–11.5, temperatures 373–393 K, and time 48–96 h) also affected the formation of unimodal and bimodal mesoporous Al-MCM-41-HAc. In addition, the maximum adsorption amount onto bimodal mesoporous Al-MCM-41-H 2 SO 4 (476.19 mg g −1 at 308 K) was larger than that onto unimodal mesoporous Al-MCM-41-HAc (243.90 mg g −1 at 303 K). The mesoporous Al-MCM-41s showed good stability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Rongrong Li,Wubing Yao,Yanxian Jin,Wenping Jia,Xiaoying Chen,Jingjing Chen,Jianli Zheng,Yuan Hu,Deman Han,Jia Zhao
Hydrocinnamaldehyde (HCAL) is a crucial intermediate in the manufacture of perfumes and pharmaceuticals, but highly selective hydrogenation of cinnamaldehyde (CALD) to hydrocinnamaldehyde with a good conversion rate is a challenging. We report that the incorporation of Ag into Pd-based catalysts promotes their catalytic activity and HCAL selectivity (HCAL selectivity of 98.6% with >99.9% CALD conversion for Pd-0.3Ag/MCM-41) for CALD hydrogenation compared to those of catalysts with no Ag, e.g., HCAL selectivity of 84.5% for Pd/MCM-41and 77.3% for Pd/AC (activated carbon). The Pd-0.3Ag/MCM-41 catalyst shows an outstanding stability during five cycles of use. The excellent performance of the Pd-0.3Ag/MCM-41 catalyst in CALD hydrogenation is due to the ultra-small size of the Pd nanoparticles (Pd-Ag alloy, a geometric and electronic modification of Pd).
研究领域:
化学工程
·
催化科学
✓ 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）