FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Hao Zhang,Tuo Zhang,Jiachen Zang,Chenyan Lv,Guanghua Zhao
CO 2 is a greenhouse gas and a major contributor to global warming . Efficient conversion of CO 2 into high value-added food materials represents a promising strategy to decrease CO 2 concentration. In this study, we reported that Ca 2+ -crosslinked alginate beads loaded with carbonic anhydrase (CA) can efficiently catalyze conversion of CO 2 into porous vaterite CaCO 3 particles via a carboxymethyl cellulose (CMC) inducing process. CA encapsulated within the Ca 2+ -crosslinked alginate beads maintained around 100% activity of its original activity after 10 assay cycles. Functionally, the CA-loaded alginate beads facilitated conversion of CO 2 into porous vaterite CaCO 3 particles with high CO 2 removal efficiency in the presence of carboxymethyl cellulose. Notably, such vaterite CaCO 3 particles can be explored for adsorption of astaxanthin with higher loading capacity (2.0 wt %), consequently improving the photo- and thermal-stability of this pigment.
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DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zhen-Hong He,Yong-Chang Sun,Yuan-Yuan Wei,Kuan Wang,Weitao Wang,Zhuo Chen,Zhong-Yu Wang,Yue Tian,Zhao-Tie Liu
The reaction of methanol and CO 2 is an ideal route for the utilization of CO 2 resources and the synthesis of dimethyl carbonate (DMC), which is an important fuel and fuel-additive. In this work, we developed a catalyst of CeO 2 nanoparticles (CeO 2 NPs) loaded on Co 3 O 4 nanosheets (Co 3 O 4 NSs) with the Ce/Co molar ratio of 3/7 (Ce 3 -NPs/Co 7 -NSs) which could efficiently catalyze the reaction. The formation activity and the yield of DMC reached 16.8 mmol·g cat -1 ·h −1 and 47.2 % (based on methanol), surpassing most reported catalysts, especially at a relatively low temperature of 120 ℃. Characterization results indicated that the Co 3 O 4 NSs could enhance the amounts of oxygen vacancies and CO 2 adsorption but reduce methanol adsorption. The adsorption equilibrium between methanol and CO 2 is crucial for the titled reaction, and the in-situ IR spectra confirmed that the catalyst could simultaneously activate CO 2 and methanol and the reaction involves a Langmuir-Hinshelwood (LH) mechanism. The present strategy for constructing a catalyst of CeO 2 nanoparticles loaded on Co 3 O 4 nanosheets provides an efficient catalyst for the DMC synthesis from CO 2 and methanol and offers an important reference in building other catalysts with adjustable adsorption capacities of CO 2 and methanol.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 12
·1-12
·
IF 4.5
Song Jinbo,Jing Jieying,Zhang Jinpeng,Xu Yufeng,Li Wen-Ying
Alkaline metal salt-promoted MgO sorbents are effective for CO 2 capture, but they face challenges with decreased CO 2 capture performance and powder elutriation in practical applications, arising due to the loss of pore structures and poor mechanical strength of alkaline metal salt-promoted MgO sorbent powder. Herein, granulation technology was employed to resolve the above problem. The optimized alkaline metal salt-promoted MgO sorbent pellets exhibited a CO 2 capture capacity of 11.46 mmol·g −1 and a mechanical strength of 11.14 MPa. This mechanical strength was nearly three times greater than that of alkaline metal salt-promoted MgO sorbent pellets without granulation promoters. After 20 cycles, CO 2 capture capacity stabilized at 8.71 mmol·g −1 , while mechanical strength was maintained at 8.92 MPa. Through characterization, it was revealed that the pore structure generated by the pyrolysis of the granulation promoters notably increased the specific surface area, leading to high CO 2 capture capacity. Meanwhile, the strengthened mechanical strength of the alkaline metal salt-promoted MgO sorbent pellets was primarily due to the in situ formation of a γ -AlOOH sol-gel cluster skeleton. Thus, this study provides an effective technological pathway to enhance the performance of the alkaline metal salt-promoted MgO sorbent pellets for industrial applications.
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高影响因子
Artificial Cells Nanomedicine and Biotechnology
·
2020
·
IF 3.343
Baiji Xue,Jinxiang Huang,Haoxiang Zhang,Bingliang Li,Man Xu,Yuelan Zhang,Maobin Xie,Xuefeng Li
Curcumin (CM) is a natural polyphenolic compound with multiple biomedical functions. However, clinical applications face more challenges due to its low dissolution rate and poor bioavailability. Micronization is an effective strategy to overcome these drawbacks. Herein, CM nanoparticles (CM NPs, ∼300 nm) were fabricated using solution enhanced dispersion by supercritical CO2 (SEDS). The solubility of CM NPs was remarkably enhanced. Aim to study the effects of micronization on the biological functions of CM, we investigated the antibacterial activity of original CM and CM NPs upon Pseudomonas aeruginosa. In vitro, the minimal inhibitory concentrations (MIC) assay, solid-medium spot assay, growth kinetics assay and morphologic observation using atomic force microscopy (AFM) confirmed that the anti-P. aeruginosa activity of CM NPs was enhanced compared to original CM. Moreover, CM NPs also showed stronger inhibition for adhesion and biofilm formation of P. aeruginosa compared to original CM. Experiments on mice infected with P. aeruginosa showed that CM NPs have a better therapeutic effect than the original CM in vivo. In summary, CM NPs may be a novel and promising therapeutic candidate for bacterial infection.
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高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2020
·Vol. 49
·期 3
·257-271
·
IF 1.273
Zhu Xiao,Song Mengling,Ling Baoping,Wang Sihan,Luo Xiaoyan
Abstract A novel anion-functionalized protic ionic liquid (IL), [DBUH][Triz], has been synthesized from 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU) and 1,2,4-triazole (Triz). Density ( ρ ) and viscosity ( η ) of [DBUH][Triz] at different temperatures have been measured and the influence of temperature has been analyzed quantitatively. Then, the applications of [DBUH][Triz] in CO 2 absorption have been investigated. It has been detected that this ionic liquid, which was easily prepared, shows excellent reversibility and a high absorption capacity, about 1.5 mol CO 2 per 1 mol of IL (about 0.3 g CO 2 per 1 g of IL). In addition, the influence of temperature, pressure and moisture on the absorption performance of [DBUH][Triz] has been studied separately, indicating that absorption is promoted by lower temperature and higher CO 2 pressure. In addition, the mechanism of chemical absorption at two active sites has been deduced based on quantum-chemical calculations and 13 C NMR spectra coupled with IR spectra. Furthermore, the equilibrium constant of chemical absorption ( K ) was calculated from the CO 2 capacity at different temperatures ( T ) and a good linear relationship between the natural logarithm of the equilibrium constant ln K and 1/ T was obtained with R 2 of 0.996. From the slope and intercept of the fitted straight line, the molar reaction enthalpy change (Δ r H m ) and molar reaction entropy change (Δ r S m ) were analyzed, indicating that the capture of CO 2 is an exothermic process and the IL–CO 2 complex is less ordered than the pure ionic liquid. Graphic Abstract
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高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-8
·
IF 3.998
Wang Tao,Wang Xinru,Hou Chenglong,Liu Jun
Obstacles to widespread deployments of direct air capture of CO 2 (DAC) lie in high material and energy costs. By grafting quaternary ammonium (QA) functional group to mesoporous polymers with high surface area, a unique DAC adsorbent with moisture swing adsorption (MSA) ability and ultra-high kinetics was developed in this work. Functionalization is designed for efficient delivery of QA group through mesopores to active substitution sites. This achieved ultra-high kinetics adsorbent with half time of 2.9 min under atmospheric environment, is the highest kinetics value reported among DAC adsorbents. A cyclic adsorption capacity of 0.26 mmol g −1 is obtained during MSA process. Through adsorption thermodynamics, it is revealed that adsorbent with uniform cylindrical pore structure has higher functional group efficiency and CO 2 capacity. Pore structure can also tune the MSA ability of adsorbent through capillary condensation of water inside its mesopores. The successful functionalization of mesoporous polymers with superb CO 2 adsorption kinetics opens the door to facilitate DAC adsorbents for large-scale carbon capture deployments.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yutao Liu,Hong Wu,Siqi Wu,Shuqing Song,Zheyuan Guo,Yanxiong Ren,Rui Zhao,Leixin Yang,Yingzhen Wu,Zhongyi Jiang
Covalent organic frameworks (COFs) have stimulated an immense interest for membrane separation owing to their defined nanoscale channels, tailorable chemical functionality, and total organic backbone. However, the development of COF-based membranes for gas separation remains a great challenge due to the limited functional groups and relatively large pore size of the existing COFs. The rational design and appropriate modification of COFs are urgently demanded for more efficient CO 2 separation. In this study, we propose a multi-function integration strategy for the design of COF fillers considering entire morphological structure, aperture adjustment and channel decoration, as well as interface optimization. The COF hollow microsphere with polyethylene glycol monomethyl ether (PEG) modification on both outer surface and inner channel wall was synthesized and filled into commercial Pebax polymer to fabricate mixed matrix membranes (MMMs). The hollow structure of COF fillers reduces the mass transport resistance. PEG functionalization provides channel wall with ethylene oxide groups and decreases the COF pore size for simultaneous enhancement of solubility selectivity and diffusion selectivity. Moreover, PEG chains on the outer surface improve the interface compatibility between COF fillers and Pebax matrix. The resulting MMMs exhibit superior CO 2 /CH 4 separation performances, surpassing the 2008 Robeson's upper bound.
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高影响因子
ACS Omega
·
2020
·
IF 2.87
Yangyang Guo,Lei Luo,Yang Zheng,Tingyu Zhu
For improving the CO2 adsorption capacity of solid-supported amines, five commercial porous supports have been selected and impregnated with tetraethylenepentamine (TEPA), and their CO2 adsorption performances have been evaluated using a fixed-bed reactor coupled with mass spectrometry. For solid-supported amines, CO2 adsorption capacities coincide with the texture characterization of the adsorbent supports (mesoporous alumina, montmorillonite, silica gel, porous resin, MCM-41 molecular sieve), and the optimum TEPA loading amount is mainly affected by the pore volume. The mesoporous supports were found to be more conducive to uniform loading of organic amine, with more than 370 mg/g CO2 adsorbed per unit TEPA. Other components in flue gas, especially H2O, favor CO2 adsorption on solid-supported amines. SO2 inhibited the CO2 adsorption, which was mainly attributable to the strong and irreversible binding of SO2 on some amine sites. NO had little effect on CO2 adsorption. Thermal stabilities of solid-supported amines have been tested based on thermogravimetry curves, and the main weight loss peak for TEPA appears at 513 K for solid-supported amines. Linear and step regeneration modes have been compared, revealing that the temperature for step regeneration is 37 K lower than that for the linear regeneration mode. Moreover, the desorption peak area for the step regeneration mode is 20% higher than that for the linear regeneration mode, indicating that the step regeneration mode can be used in practical applications, to reduce energy consumption during regeneration.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xiu-Hui Zhao,Qing-Song Chen,De-Huang Zhuo,Jian Lu,Zhong-Ning Xu,Chong-Min Wang,Jing-Xiao Tang,Shi-Gang Sun,Guo-Cong Guo
Electrochemical reduction of CO 2 is still far away from the practical application because of the stability of CO 2 and the diversity of reduction products. It is thus of great importance to further explore catalysts with high efficiency for CO 2 reduction to targeting products. Herein, for the first time, a hybrid of BiO x decorated with carbon thin layer is developed as high active electrocatalyst for CO 2 conversion, which is synthesized by pyrolysis using Bi MOF as precursor and sacrificial template. It is found that the as-prepared BiO x catalyst is enriched with oxygen vacancies stabilized by the decorated carbon thin layer. The oxygen vacancies enriched BiO x catalyst exhibits superior performance for CO 2 reduction to formate, achieving a maximum Faradaic efficiency of 89.3% and a maximum current density of 37.8 mA cm −2 . The thin carbon layer and oxygen vacancies improve the charge transfer of the catalyst and hence in favor of the high formate current density. The defects of oxygen vacancies play a vital role in CO 2 adsorption and activation and thereby further enhancing the electrocatalytic ability for formate production.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Jian-Lei Qi,Dan Zhou,Qin-Qin Xu,Jian-Zhong Yin,Kun-Peng Yu,Hai-Xin Sun
In recent years, single-atom catalysts (SAC) have emerged as a new frontier in the field of heterogeneous catalysis owing to their unique properties and minimized metal dosage. Herein, the Pd-ZIF-8 single-atom catalyst was successfully fabricated using ZIF-8 as support, and Pd(hfac) 2 as the precursor using the supercritical CO 2 deposition method. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) images confirmed the formation of uniformly dispersed Pd atoms. Supercritical CO 2 has the advantage of zero-surface tension and high diffusibility, it can carry the molecules of Pd precursor into the micropores of ZIF-8. The dissolution and diffusion of precursor were observed by a visual view cell and the mechanism of the preparation was analyzed. Finally, semi-hydrogenation of phenylacetylene to styrene was performed to evaluate the catalytic activity of the prepared Pd-ZIF-8 catalyst. The conversion rate of 80.7% and selectivity of 92.2% were obtained at 70 °C and 4 h in the semi-hydrogenation of phenylacetylene.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Longkai Pan,Li Yao,Hui Mei,Hongxia Liu,Zhipeng Jin,Shixiang Zhou,Minggang Zhang,Gangqiang Zhu,Laifei Cheng,Litong Zhang
In this study, a novel 3D Bi 2 S 3 /P-ZnO S-scheme gyroid metamaterial was prepared by 3D printing and the hydrothermal method. The unique gyroid macrostructure and nanoarray microstructure offer a large volume of active sites for the photothermal catalytic reaction, thus improving the overall utilization rate of light. ZnO obtained by sintering the precursor produces oxygen vacancies, primarily due to P doping. This enables it to have a photothermal effect. After loading Bi 2 S 3 , the photothermal effect of P-ZnO and Bi 2 S 3 is coupled, further increasing the surface temperature of composite structure and speeding up the reaction rate. P-ZnO and Bi 2 S 3 formed a S-scheme heterojunction, promoting the separation and transfer of photogenerated carriers. Under simulated sunlight, the CO and CH 4 yield of Bi 2 S 3 /P-ZnO S-scheme gyroid metamaterials are 8.87 and 1.49 μmol h −1 . These are 3.45 times and 4.65 times of P-ZnO gyroid structure, respectively. Through SEM, TEM, XPS, ESR and in-situ FTIR characterizations, the transfer paths of photogenerated carriers between heterojunctions were revealed, and the reaction paths of photothermal catalytic CO 2 reduction were explored. The co-design of 3D structure and material allows for a novel concept for further improving photothermal catalytic performance.
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高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Changqing Tian,Qiang Huang,Daofu Wu,Junan Lai,Fei Qi,Nan Zhang,Wenxia Zhang,Xiaosheng Tang
The lead halide perovskites have broad application prospects in the fields of optoelectronics and photocatalysis . However, their toxicity and limited stability are the main obstacles restricting their large-scale photocatalytic applications. In order to solve these problems, a set of lead-free stable Cs 2 XCl 6 (X = Hf, Zr, Te) perovskite microcrystals were synthesized via a solvothermal solution. For the first time, the Cs 2 XCl 6 (X = Hf, Zr, Te) perovskite microcrystals were employed as efficient photocatalysts for the conversion of CO 2 into CO and CH 4 . Among them, the Cs 2 TeCl 6 microcrystals showed the best photocatalytic performance under light irradiation for 3 h, while the yields of CO and CH 4 were 284.4 μmol/g and 48.96 μmol/g respectively. Our strategy may provide a new idea for the CO 2 photoreduction based on lead-free halide perovskites.
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高影响因子
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