CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guodong Zhang,Zhe Liu,Daming Liu,Yan Lin,Fei Wang
The volume penalty of nano-porous materials causes low methane volumetric adsorption capacity, and the contradiction between it and gravimetric adsorption capacity limits the application of nano-porous materials in different scenarios. Here, we prepared a composite nano-porous material of ZIF-8@AC to bridge the gap using a synergistic approach of adsorption and hydration, and methane isothermal adsorption in wet ZIF-8@AC was evaluated under low temperature. Due to the hybrid effect of adsorption and hydration, methane storage capacity in the nano-porous material was enhanced. When 100 mg activated carbon was doped, methane gravimetric adsorption capacity in ZIF-8@AC increases by 6.78 % and 30.34 % comparing with that in parent AC and ZIF-8 separately. In addition, the formation of hydrate increases methane storage density in mesopores, macropores and intergranular pores, giving rise to large methane volumetric adsorption, which increases by 12.65 % and 53.24 % comparing with that in parent AC and ZIF-8, respectively. Moreover, hydration efficiency in confined pore space was investigated by differential scanning calorimetry (DSC), while a high-resolution electron microscope was applied to record hydrate morphologies. It was found that hydrate mainly forms in large pore spaces, and the enhanced intergranular pores serve as nanoreactors to significantly improve the hydration efficiency, which is greatly influenced by local water distribution. These findings provide a new strategy to enhance methane adsorption via adsorption and hydration hybrid approach and would shed light on the application of composite nano-porous materials in the adsorption of natural gas.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Tiantian Feng,Qing Liu,Can Yang,Guiju Li,Jin Liu
Considering the stability and hazard of chromium complexes, their removal and recovery from industrial wastewater is a worthy goal. Membrane capacitive deionization (MCDI) can effectively reduce co-ion adsorption compared with CDI technology and has been demonstrated to be a promising deionization technology. In this study, functionalized activated carbon (AC@SiO 2 -NH 2 ) was applied as a MCDI eletrode. The AC@SiO 2 -NH 2 adsorbs chromium complexes (Cr(Ⅲ)-EDTA) through electrostatic gravitation of protonated amino groups (-NH 3 + ). With applied voltage of 1.2 V, solution flow rate of 20 mL min −1 and initial concentration of 300 mg L −1 , the electrosorption capacity of the AC@SiO 2 -NH 2 electrode for Cr(Ⅲ)-EDTA was 17.70 mg g −1 . The Ragone curves verified that the electrosorption rate (SER) of the AC@SiO 2 -NH 2 electrode was positively correlated with voltage and initial concentration. Moreover, the effects of competing ions (K + , Na + , and Mg 2+ ) in a series of single electrolyte solution by the AC@SiO 2 -NH 2 electrode were investigated. It was also verified that the optimum pH was 3 for electrostatic attraction. The energy consumption of the MCDI process is calculated as 0.251 kWh m 3 and 0.039 kWh g −1 Cr at 1.2 V. We envisage that the use of AC@SiO 2 -NH 2 electrodes will pave the way for efficient operation of MCDI as well as the preferential recovery of Cr(Ⅲ)-EDTA.
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
Catalysts
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2021
·Vol. 11
·期 8
·915
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IF 4.146
Yongjie Xin,Sichan Li,Haiyong Wang,Lungang Chen,Shuang Li,Qiying Liu
The selective hydrogenolysis of 5-hydroxymethylfurfural (HMF) platform molecule to 2,5-dimethylfuran (DMF) has attracted increasing attention due to its broad range of applications. However, HMF, with multiple functional groups, produces various byproducts, hindering its use on an industrial scale. Herein, a bimetallic Pt-FeOx/AC catalyst with low Pt and FeOx loadings for selective HMF hydrogenolysis to DMF was prepared by incipient wetness impregnation. The structures and properties of different catalysts were characterized by XRD, XPS, TEM, ICP-OES and Py-FTIR techniques. The addition of FeOx enhanced Pt dispersion and the Lewis acidic site density of the catalysts, and was found to be able to inhibit C=C hydrogenation, thereby im-proving DMF yield. Moreover, the presence of Pt promoted the reduction of iron oxide, creating a strong interaction between Pt and FeOx. This synergistic effect originated from the activation of the C–O bond over FeOx species followed by hydrogenolysis over the adjacent Pt, and played a critical role in hydrogenolysis of HMF to DMF, achieving a yield of 91% under optimal reaction conditions. However, the leaching of Fe species caused a metal–acid imbalance, which led to an increase in ring hydrogenation products.Keywords:5-hydroxymethylfurfural;2,5-dimethylfuran;hydrogenolysis;Pt-FeOx/AC;synergistic effect
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
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2016
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IF 4.219
Lei Tao,Fei Song,Naiyu Xu,Duxin Li,Robert J. Linhardt,Zhenqing Zhang
Hyaluronic acid (HA), a glycosaminoglycan, is a linear polysaccharide with negative charge, composed of a repeating disaccharide unit [→4)-β- d -glucopyranosyluronic acid (1 → 3)-β- d - N -acetyl- d -glucoaminopyranose (1 → ] n ([→4) GlcA (1 → 3) GlcNAc 1 → ] n ). It is widely used in different applications based on its physicochemical properties associated with its molecular weight. Enzymatic digestion by polysaccharides lyases is one of the most important ways to decrease the molecular weight of HA. Thus, it is important to understand the action patterns of lyases acting on HA. In this study, the action patterns of two common lyases, Flavobacterial chondroitinase AC I and Streptomyces hyaluronidase, were investigated by analyzing HA oligosaccharide digestion products. HA oligosaccharides having an odd-number of saccharide residues were observed in the products of both lyases, but their distributions were quite different. Chondroitinase AC acted more efficiently at the β 1–4 glycosidic bond linking GlcNAc and GlcA. Oligosaccharides, having an even number of saccharide residues, and with an unsaturated uronic acid (4-deoxy-α- l - threo -hex-4-enepyranosyluronic acid, △UA) residue at their non-reducing end represent the major product. A minor amount of oligosaccharides having an odd number of saccharide residues resulted from the irregular terminal residues of HA substrate chains. Hyaluronidase showed a more complicated product mixture. Its minimum recognition and digestion domain is HA heptasaccharide and it could cleave both β 1–4 and β 1–3 glycosidic linkages. The HA oligosaccharides, generated with a 2-acetamido-2,3-di-deoxy-β- d - erythro -hex-2-enopyranose (△HexNAc) at the non-reducing end, are believed to be unstable and undergo breakdown immediately after their generation, and the oligosaccharides with △UA residue at the non-reducing end are formed. Thus, oligosaccharides having both an even and odd-number saccharide residues with a △UA residue at their non-reducing ends, represent the major products of hyaluronidase acting on HA.
研究领域:
生物化学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Yongjun Shen,Yunli Wang,Kaixia Fan
ABSTRACT Acid turquoise blue A (ATBA) is treated by the combined dielectric barrier discharge (DBD) plasma and AC supported CuO (CuO/AC). CuO/AC is prepared by incipient wetness impregnation method. X-ray diffraction, N 2 adsorption/desorption isotherm, and scanning electron microscope are used to characterize the CuO/AC. Interactive effects of initial pH, conductivity value, input power, and CuO/AC dosage on the decolorization rate of ATBA are investigated. The predicted decolorization rate of ATBA reaches to 97.12% under the optimal condition, only have 1.95% error compared with the experimental value (95.87%). The possible coupling mechanisms of combined DBD plasma and CuO/AC are proposed.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xiaodi Zhang,Jiming Wang,Guojie Zhang,Jun Liu,Ying Wang,Yuqing Zhao,Guoqiang Li
To improve the DRM reaction performance of the catalysts, a series of Co–Ni/WC-AC catalysts are prepared by impregnation using WC-AC as the support. The structural features of the fresh and spent catalysts are characterized by BET, XRD , H 2 -TPR, XPS and TG . The results show that the introduction of Ni in the 20Co/WC-AC catalyst promotes the conversion of W species to WC. Further, WC enhances the interaction between the active metal and the support. Thus, the activity and sintering resistance of Co–Ni/WC-AC catalysts are improved. It is also found that the introduction of different ratios of Ni has a significant effect on the chemical environment (oxygen environment) on the catalyst surface.10Co–10Ni/WC-AC catalysts showed high surface O α and O β contents of 26% and 53%, respectively. The catalyst shows excellent catalytic performance. The conversion of CH 4 and CO 2 is stable at about 84% and 85% at 800 °C.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Benlong Wei,Zhuannian Liu
Hybrid capacitive deionization (HCDI) is an innovative CDI technology that outperforms conventional CDI concerning desalination capability and charge efficiency. However, underutilized cathodes or anodes and mismatched kinetic behavior remain unsatisfactory given the imbalanced device architecture consisting of the capacitor and Faraday electrodes. Herein, we proposed a pseudo-capacitive behaviors induced dual-ion selective deionization (Di-CDI) strategy where molybdenum disulfide/polypyrrole (MoS 2 /PPy) acted as Na + intercalation cathode, and Ag-coated polyaniline-modified activated carbon (Ag@PANI/AC) served as Cl − trapping anode. In this system, the hollow PPy nanotube as the core is anchored by ultrathin MoS 2 nanoflakes, connecting loose MoS 2 nanoflowers to form a 3D flower-chain network, which holds convenient electron transfer routes and fast charge transport channels, facilitating accelerated ion diffusion process. Besides, Ag@PANI/AC was synthesized by modifying Ag particles on a 3D electron conduction substrate constructed by coupling PANI and AC, where Ag is responsible for the conversion reaction with Cl − to create AgCl. The conduction matrix compensates for the low conductivity of AgCl, enabling fast adsorption kinetics. As expected, the assembled Di-CDI system MoS 2 /PPy//Ag@PANI/AC delivers an excellent adsorption capacity of 25.1 mg g -1 , outstanding desalination rate (5.88 mg g -1 min -1 ), superior cycle stability (91.5% retention rate), and promoted charge efficiency of 56.2%, validating that this strategy supplies a viable way to achieve more energy-efficient CDI.
研究领域:
材料科学
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环境科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2020
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IF 3.687
Na Ji,Zhenyu Liu,Xinyong Diao,Jinrong Bao,Zhihao Yu,Chunfeng Song,Qingling Liu,Degang Ma,Xuebin Lu
GVL (γ-valerolactone) is identified as an important biomass platform molecule due to its wide application. In this work, a series of novel supported Ni catalysts with different supports and Ni loading were synthesized via metal-organic chemical vapor deposition (MOCVD) method for the hydrogenation of EL (ethyl levulinate) to GVL. Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), nitrogen adsorption/desorption, inductively coupled plasma optical emission spectroscopy (ICP-OES) and transmission electron microscopy (TEM) were used to characterize the as-synthesized catalysts. The results showed that the 2 wt.% Ni/AC(MOCVD) presented superior catalytic activity when compared with the catalyst prepared by impregnation method. This behavior is explained in terms of the smaller Ni nanoparticles (4.28 nm) and higher dispersion on 2 wt.% Ni/AC(MOCVD). Among the catalysts, the 2 wt.% Ni/AC catalyst exhibited the best catalytic performance with 99.7 % EL conversion and 79.8 % GVL yield under 1 MPa initial H 2 pressure (measured at room temperature) at 250 °C for 2 h. In addition, the reaction conditions were optimized and the stability of the catalyst were also investigated. The insights gained from this study in the design of high dispersed Ni particles with smaller particle size via MOCVD method will facilitate the metal-catalyzed hydrogenation of EL to GVL.
研究领域:
化学工程
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生物质能源
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催化科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
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2014
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IF 3.259
Di Wu,Jin Yan,Jing Wang,Qing Wang,Hui Li
Binding interaction of human serum albumin (HSA) with allura red AC, a food colourant, was investigated at the molecular level through fluorescence, ultraviolet–visible, circular dichroism (CD) and Raman spectroscopies, as well as protein–ligand docking studies to better understand the chemical absorption, distribution and transportation of colourants. Results show that allura red AC has the ability to quench the intrinsic fluorescence of HSA through static quenching. The negative values of the thermodynamic parameters Δ G , Δ H , and Δ S indicated that hydrogen bond and van der Waals forces are dominant in the binding between the food colourant and HSA . The CD and Raman spectra showed that the binding of allura red AC to HSA induces the rearrangement of the carbonyl hydrogen-bonding network of polypeptides, which changes the HSA secondary structure. This colourant is bound to HSA in site I, and the binding mode was further analysed with the use of the CDOCKER algorithm in Discovery Studio.
研究领域:
生物化学
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食品科学
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药物化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 1
·66-75
·
IF 3.288
Pengfei Zhang,Na Li,Zhiting Wei,Ziqi Wang,Mengwei Gou,Lei Zhao,Wenbo Chen,Qinping Qiang
Alternating current light-emitting diodes (AC-LEDs) set up a new era of economic semiconductor-based lighting. However, the flicker of AC-LEDs in the AC cycles is unhealthy for human eyes. In this work, the red-emitting afterglow phosphor Ca4Nb2O9:Pr3+ was successfully synthesized via a traditional high temperature solid-state reaction method. The phase composition, photoluminescence spectra, afterglow curve, and thermoluminescence were investigated. It was revealed that the red emission (617 nm) is ascribed to the 3P0 → 3H6 transition of Pr3+ ions, and the afterglow time was in the second range after removal of the excitation source. In order to gain a deeper understanding of the origin of afterglow, a subsequent thermoluminescence analysis was performed and a relatively shallow trap within the host was found. These results indicated that Ca4Nb2O9:Pr3+ phosphors could compensate for the flickering behavior of AC-LEDs and may be a candidate for application in AC-LEDs.
研究领域:
材料科学
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光电
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光子学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yuying Zhang,Na Li,Lianmei Chen,Fangrui Yu,Xueru Sheng,Jian Zhang,Qingwei Ping,Hongbin Li
Laccase immobilization is an effective way to realize the industrial application of laccase, but the loss of immobilized laccase activity is serious, which is an urgent problem to be solved. In this study, a novel laccase immobilization material was prepared by mixing waste Mn–Cu-loaded activated carbon with cellulose solution and regenerated in hydrochloric acid solution, which significantly improved the immobilized laccase activity. The optimum immobilization conditions (T, pH and initial laccase concentration) of Mn–Cu-AC/cellulose beads (Mn–Cu-ACC) for laccase were studied by the response surface method. Under the optimum conditions (T = 43 °C, pH = 4.0 and c = 6.8 g L−1), immobilized laccase (Laccase@Mn–Cu-ACC) showed excellent performance in terms of pH stability, thermostability and storage stability. And the enzyme activity of the laccase immobilized on the Mn–Cu-ACC carrier remarkably increased by 29.6% compared to that of the ACC. At last, the Laccase@Mn–Cu-ACC was used for the degradation of bisphenol A (BPA). Under the optimum conditions (t = 5.5 h, T = 45 °C, pH = 4.0 and initial cBPA = 70 mg L−1), the removal rate of BPA reached 72.3% in the first cycle, and after 5 cycles of reusing the immobilized laccase, the relative removal rate of BPA was retained at 53.2% of the initial removal rate. This study developed a new type of immobilized laccase carrier and provided a new path for the application of waste heavy metal loaded activated carbon.
研究领域:
生物化学
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环境科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Bin Wang,Pei-ya Li,Qian Dong,Li-qin Chen,Hai-qiang Wang,Pei-long Han,Tao Fang
Liquid organic hydrogen carrier technology (LOHC) is considered to be the most promising solution for hydrogen storage and transport, but its development is limited by the high cost of noble metal catalysts. In this paper, four kinds of Ni/Co bimetallic catalysts with different proportions were prepared by the impregnation method. The effects of the Ni/Co molar ratio and the reduction temperature on the hydrogenation performance of N-ethylcarbazole (NEC) were studied. The relationship between the structure and the properties of the catalyst was discussed by combining various characterization methods. The results show that when cobalt is added to 50%, the hydrogenation activity is the most significant. Meanwhile, 100% of NEC conversion and 98.99% of 12H-NEC selectivity were achieved. The hydrogenation capacity is 5.77 wt %, when the catalyst reduction temperature is 450 °C. The characterizations show that the two metals are uniformly doped and highly dispersed with a good pore structure, and the metal particles have good alloy morphology. The synergistic interaction between Ni/Co metals is the key factor for the remarkable catalytic activity of the catalyst. The design and application of highly efficient nonprecious metal hydrogenation catalysts provide more feasibility to promote the commercial development of liquid organic hydrogen carrier technology.
研究领域:
催化化学
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能源材料科学
✓ 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）