Journal of CO2 Utilization
·
2017
·
IF 4.292
Changsheng Cao,Zhenhai Wen
Cu-based composites with different compositions and construction can seriously influence its electrocatalytic performance toward CO 2 reduction reaction (CO 2 RR). Herein, we report a microwave-assistant route to prepare Cu nanoparticles decorating reduced graphene oxide (CuNPs/rGO) nanohybrids, which are characterized by a variety of techniques, demonstrating that Cu nanoparticles coupling with Cu x O nanoparticles were uniformly anchored on the surface of rGO, as well as the existence of grain boundaries. The CuNPs/rGO composites are studied as electrocatalyst for CO 2 RR and show a favorable electrocatalytic activity toward CO 2 RR with an onset potential of −0.9 V, corresponding to about only 190 mv overpotential for CO generation. Besides with a small amount of HCOOH (<5%), H 2 and CO are the main CO 2 reduction products with a tunable ratio of from 1.16:1 to 6.38:1 by changing the applied potentials. The gaseous products with various ratio of H 2 to CO can be potentially used as syngas to produce more valuable products in industry. This work demonstrates a simple, facile and effective way to improve the electrocatalytic CO 2 RR performance of Cu-based composites.
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2014
·Vol. 5
·期 24
·7109-7120
·
IF 5.368
Ning Che,Saina Yang,Hongliang Kang,Ruigang Liu,Zhuang Li,Zhijing Liu,Pingping Li,Xiaozhong Qu,Yong Huang
Dextran graft poly((N-amidino)hexyl methacrylamide) (Dex-g-PAHMA) copolymers were synthesized by free radical polymerization in aqueous solution and characterized. Dex-g-PAHMA copolymers can self-assemble into micelles with the PAHMA rich core and dextran rich shell in aqueous media. The CO2 sensitivity of the micelles was investigated by dynamic light scattering (DLS), conductivity and zeta potential. The results confirmed that the Dex-g-PAHMA copolymer micelles have reversible CO2 sensitivity. The micelles can be used as doxorubicin (DOX) carriers and DOX molecules are mainly located in the core of the micelles. The MTT assay indicated that the Dex-g-PAHMA graft copolymers are non-toxic to cells in the copolymer concentration range of 5–1000 μg mL−1, whereas the relative cell viability is greatly reduced with the increase of copolymer concentration for DOX-loaded micelles. The DOX-loaded micelles can be endocytosed by MCF-7 cells and the DOX can release from micelles and diffuse into the cell nucleus. The Dex-g-PAHMA copolymers have promising applications as drug carriers for cancer therapy.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Yu Zhang,Wei Su,Yan Sun,Jia Liu,Xiuwu Liu,Xiaojing Wang
MIL-101 is a promising adsorbent because of its large pore volume, high separation selectivity, easy regeneration, and good stability. MIL-101 was synthesized and characterized by X-ray diffraction, scanning electron microscopy, and nitrogen adsorption at 77 K. Adsorption isotherms of pure N2, CH4, and CO2 were measured on MIL-101 from 263 K to 313 K and at pressures up to 0.8 MPa. The Langmuir model was a good fit for the experimental isotherms and the isosteric heats of adsorption decreased in the order: CO2 > CH4 > N2. The CO2/CH4 separation selectivity was sensitive to the adsorption pressure and temperature and it varied from 3.2 to 6.3. In contrast, the CH4/N2 separation selectivity changed from 2.6 to 3.3 with temperature and pressure.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Lin-Bing Sun,Ying-Hu Kang,Yao-Qi Shi,Yao Jiang,Xiao-Qin Liu
Owing to their high physicochemical stability and low skeleton density, polymers are highly promising for capturing the greenhouse gas CO2. However, complicated monomers, expensive catalysts, and/or severe conditions are usually required for their synthesis, which makes the process costly, tedious, and hard to scale up. In this paper, a facile nucleophilic substitution reaction is developed to synthesize polymers from low-cost monomers, namely chloromethylbenzene and various diamines. Due to the appropriate reactivity of monomers, the polymerization takes place at a low temperature of about 60 °C in the absence of any catalysts. A series of polymers containing plentiful secondary amines are successfully fabricated; these secondary amines provide a proper adsorbate–adsorbent interaction from the viewpoints of selective capture of CO2 and energy-efficient regeneration of adsorbents. Moreover, the materials possess well-defined micropores with the dimension close to the size of adsorbate molecules and subsequently, exhibit the molecule sieving effect. As a result, these materials are active in selective adsorption of CO2 and show high CO2/N2 and CO2/CH4 selectivities. More importantly, the adsorbents can be completely regenerated under mild conditions, and no loss in activity is detected after eight cycles.
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2017
·Vol. 32
·期 8
·1448-1455
·
IF 1.509
Jing Li,Shuhua Han
A novel chemosensor TrisRh based on tris(2-aminoethyl)amine and rhodamine 6G is designed and synthesized as a fluorescence turn-on probe for Co 2+ ions that is paramagnetic with a property of quenching fluorescence. Rhodamine spirolactam forms are nonfluorescent, whereas, ring-opening of corresponding spirocyclic induced by Co 2+ results in strong fluorescence emission. Upon the addition of Co 2+ ions, TrisRh can display significant enhancements in absorbance and fluorescence intensity as well as evident colorific transformation, which can be perceived by the naked eye. The association stoichiometry of TrisRh to Co 2+ ions was inferred to be 1:1 through Job's plot and electrospray ionization mass spectrometry analysis. The binding model was speculated from Fourier transform infrared spectra and 1 H–nuclear magnetic resonance technologies. Significantly, the limit of detection was determined to be as low as 1.22 nmol. Furthermore, TrisRh can exhibit robust anti-jamming ability against other interference metal ions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2015
·Vol. 8
·期 2
·1140-1146
·
IF 7.394
Chunmei Gao,Shaoyu Lü,Mingzhu Liu,Can Wu,Yun Xiong
The synthesis and properties of CO2 responsive and fluorescent dendritic polymers, poly(amido amine)/Pluronic F127 (PAMAM/F127), are reported in this paper. The morphologies and sizes of PAMAM/F127 dendritic polymers were investigated by dynamic light scattering (DLS) and transmission electron microscopy (TEM). PAMAM/F127 dendritic polymers showed unimolecular micelle morphologies at low concentrations, and changed to multimolecular micelles at higher concentrations. Additionally, fluorescence spectra and confocal laser scanning microscopy images showed that PAMAM/F127 dendritic polymers exhibited a fluorescent enhancement response to the presence of CO2. Apart from that, the release behavior of PAMAM/F127 gels under simulated body fluids was investigated by choosing curcumin as the hydrophobic drug. The results indicated that PAMAM/F127 dendritic polymers can be used to improve the solubility of curcumin, and the drug released faster in the presence of CO2. Such CO2 responsive fluorescent dendritic polymers are potentially applicable in cellular imaging or drug controlled release.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2017
·
IF 2.726
Yue Zhao,Shufeng Shen,Yangyang Bian,Ya-nan Yang,Ujjal Ghosh
In this work, CO 2 solubility in aqueous potassium lysinate solutions has been measured for the concentrations of (1.25–3.28) mol·kg −1 and at temperatures of (313–343) K. The vapour-liquid equilibrium data were correlated using a Soft model and a semi-empirical (SE) model. The proposed models can match well with the experimental data with AAD within 20%. The heat of absorption for LysK was estimated as about (55–70) kJ·mol −1 CO 2 absorbed from the solubility data. The lower heat of absorption, compared with that of 30 mass% MEA, will be beneficial for the reduction of regeneration energy.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2024
·
IF 2.2
Jing Xia,Zhigao Sun
Thermodynamic inhibitors may be used to inhibit hydrate formation in industry. Alcohol substances, due to their hydrophilic hydroxyl groups in their molecular structure, are prone to form hydrogen bond with water molecules to inhibit hydrate formation. In this work, sec -butyl alcohol is chosen to study the effects on CO 2 hydrate dissociation equilibrium conditions, where the step-heating method is utilized to obtain hydrate equilibrium conditions. The equilibrium curve of carbon dioxide hydrate dissociation moves to the region of lower temperatures or higher pressures. The higher mass fraction of sec -butyl alcohol, the better effect of inhibiting hydrate formation. Sec-butyl alcohol can be used as a thermodynamic hydrate inhibitor.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jianing Mao,Guanghui Feng,Xiao Dong,Ziran Xu,Bingbao Mei,Yiheng Wei,Xiaohu Liu,Guihua Li,Shoujie Li,Yanfang Song,Fei Song,Wei Wei,Wei Chen,Zheng Jiang
CH 4 , as an important clean fuel and hydrogen carrier, its production from CO 2 driven by renewable energy could simultaneously achieve energy supply, CO 2 emission reduction, and renewable energy consumption, which is of great significance. Electrocatalytic CH 4 production relies on high-valence Cu species for realizing multielectron reduction, while facing inadequate performance stability due to the reconstruction tendency of Cu. Herein, an amorphous CuO x -SiO 2 catalyst (amorCuO x -SiO 2 ) is synthesized via an electrostatic interaction strategy to construct stable Cu 2+ active sites for efficient electrocatalytic CH 4 production. AmorCuO x -SiO 2 shows a good reconstruction resistance during electroreduction, confirmed via X-ray absorption spectroscopy studies, endowing a 63.7% CH 4 faradaic efficiency at 500 mA cm −2 , which is 7.8 folds of crystalized CuO x -SiO 2 (crysCuO x -SiO 2 ). Theoretical calculations revealed that stable Cu 2+ active sites enhanced *CO adsorption and were more susceptible for further hydrogenation, thus promoting the CO 2 -to-CH 4 conversion. Our findings provide a feasible strategy for developing reconstruction-resistant electrocatalysts for advanced CH 4 production performance.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Nana Zhou,Yurong Yin,Baojuan Luo,Yongxin Fu,Xiaoxun Ma,Chengyi Dai
The electrochemical CO 2 reduction reaction (eCO 2 RR), which is well suited for reducing atmospheric CO 2 levels and generating clean energy. Water is the main proton source in the electrochemical reduction process. However, water features a high dissociation energy barrier, and most protons are involved in HER, so that only a small amount of H + is used in the CO 2 reduction reaction. Herein, we reveal that appropriately chosen ligands on the catalyst surface can abstract protons from water, store them, and transfer them to CO 2 to promote the formation of COOH and improve the proton utilization efficiency of the eCO 2 RR. Moreover, the activity of the ligand complexed protons is shown to be lower than that of free ones and thus result in HER inhibition our ligands with different pK a values (i.e., proton release capacities) are used to functionalize ZnO, and the plot of pK a vs. the FE CO exhibits a volcano shape. Overly small pK a leads to the combination of abundant protons with each other and the dominance of the HER, whereas overly large pK a does not promote the utilization of H + by CO 2 . Ligands with suitable pK a can properly bind and release protons, which is conducive to the formation of *COOH, thus accelerating eCO 2 RR. In particular, mercaptobenzoic acid (MBA) considerably enhances catalytic activity because of its moderate pK a (FE CO = 90 %, which is 2 times higher than the FE CO of unmodified ZnO, and j CO is nearly 5 times higher). In situ infrared spectroscopic analysis proves that the above ligand can abstract protons from H 2 O and then release them, promoting the dissociation of H 2 O. Theoretical calculations show that pK a affects the ability of ligands to abstract and release protons.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yaru Shen,Jiasheng Cai,Xin Huang,Yi Zheng,Yu Shao
Photocatalysis is a green technology which could sustainably convert CO 2 into value-added chemicals by using solar energy. Under xenon light irradiation, Mn 2 O 3 /MgTi 2 O 5 nanocomposites synthesized by two-step hydrothermal method greatly increase photocatalytic activity of CO 2 reduction. The optimal yield 420.53 μmol g −1 h −1 for CH 4 is achieved at a ratio 1:10 (W/W) of Mn 2 O 3 to MgTi 2 O 5 , with selectivity of 98.1 %, i.e., 4 and 33 times larger than those of individual MgTi 2 O 5 and Mn 2 O 3 , respectively. The superior photocatalytic performance is attributed to the formation of S-type heterojunction, valence change of Mn 3+ /Mn 4+ , and the bridging effect of Mg migration, which facilitates the separation and transfer of photogenerated electrons and holes. Mn 2 O 3 /MgTi 2 O 5 constructs an efficient redox photocatalytic system composed of a light trapping component (Mn 2 O 3 ), electron transport channel (Mg penetrating Mn 2 O 3 ), mutually separated reduction center (MgTi 2 O 5 ) and oxidation center (Mn 2 O 3 ). The potential Mn 2 O 3 /MgTi 2 O 5 photocatalyst for CO 2 reduction provides new insights to design novel efficient photocatalyst composites akin to biological photosynthesis.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Zheng Yue,Wang Huan,Liu Yan,Liu Peiyu,Zhu Baoli,Zheng Yanning,Li Jinhua,Chistoserdova Ludmila,Ren Zhiyong Jason,Zhao Feng
The chemical transformations of methane (CH 4 ) and carbon dioxide (CO 2 ) greenhouse gases typically have high energy barriers. Here we present an approach of strategic coupling of CH 4 oxidation and CO 2 reduction in a switched microbial process governed by redox cycling of iron minerals under temperate conditions. The presence of iron minerals leads to an obvious enhancement of carbon fixation, with the minerals acting as the electron acceptor for CH 4 oxidation and the electron donor for CO 2 reduction, facilitated by changes in the mineral structure. The electron flow between the two functionally active microbial consortia is tracked through electrochemistry, and the energy metabolism in these consortia is predicted at the genetic level. This study offers a promising strategy for the removal of CH 4 and CO 2 in the natural environment and proposes an engineering technique for the utilization of major greenhouse gases.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）