Tianxiang Zhao

CO2 Fixation into Novel CO2 Storage Materials Composed of 1,2-Ethanediamine and Ethylene Glycol Derivatives

A new CO2 fixation process into solid CO2 -storage materials (CO2 SMs) under mild conditions has been developed. The novel application of amine-glycol systems to the capture, storage, and utilization of CO2 with readily available 1,2-ethanediamine (EDA) and ethylene glycol derivatives (EGs) was demonstrated. Typically, the CO2 SMs were isolated in 28.9-47.5 % yields, followed by extensive characterization using (13) C NMR, XRD, and FTIR. We found that especially the resulting poly-ethylene-glycol-300-based CO2 SM (PCO2 SM) product could be processed into stable tablets for CO2 storage; the aqueous PCO2 SM solution exhibited remarkable CO2 capturing and releasing capabilities after multiple cycles. Most importantly, the EDA and PEG 300 released from PCO2 SM were found to act as facilitative surfactants for the multiple preparation of CaCO3 microparticles with nano-layer structure.

Morphology Control in the Synthesis of CaCO3 Microspheres with a Novel CO2-Storage Material

A green and template-free method was applied to control the morphology of CaCO3 microspheres with a layered nanostructure surface and pure crystalline phase of vaterite via the hydrothermal reaction between Ca(OH)2 saturated limpid solution and a novel CO2-storage material (CO2SM). Morphologies of the as-prepared CaCO3 crystals could be tuned with CO2SM concentration, reaction temperature, or crystallization time. After the precipitation of CaCO3 crystals, the filtered solution could not only be used to absorb CO2 but also to produce CaCO3 microspheres repeatedly with the addition of Ca(OH)2 solution. Furthermore, an aggregation and self-assembly mechanism for the formation CaCO3 microspheres had been proposed. As a result, this novel synthesis strategy of CaCO3 microspheres with CO2SM again emphasized that was possible to synthesize inorganic/organic hybrid materials with exquisite morphology and offered an alternative way for comprehensive utilization of CO2.

Excess properties and viscous flow thermodynamics of the binary system 1,2-ethanediamine+triethylene glycol at T=(298.15, 303.15, 308.15, and 313.15) K for CO 2 capture

Liquid densities and viscosities are reported for the binary system of 1,2-ethanediamine (EDA)+triethylene glycol (TEG) at T=(298.15, 303.15, 308.15, and 313.15) K. Densities were measured using a capillary pycnometer and viscosities were determined using an Ubbelohde capillary viscometer. The experimental results are compared with data published in the literatures. Based on the density data and kinematic viscosity data, excess molar volumes (VmE) and deviation in kinematic viscosity (Δν) were calculated and the calculated results were fitted to a Redlich-Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE are negative in the whole composition range, whereas the values of Δν are positive over the major composition range. From kinematic viscosity data, Gibbs energies of activation of viscous flow (ΔG*), enthalpy of activation for viscous flow (ΔH*), and entropy of activation for the viscous flow (ΔS*) were also calculated.

Control over crystallization of CaCO3 micro-particles by a novel CO2SM

Different morphologies of CaCO3 micro-particles through a hydrothermal reaction between Ca(OH)2 saturated limpid solution and a new CO2-storage material (CO2SM), which was obtained from an equimolar system 1,2-ethylenediamine (EDA) + 1,2-ethylene glycol (EG) uptaking CO2, were presented without any additives. Its worth noting that the morphologies of the CaCO3 precipitates could be controlled as uniform sheaf-like (pure calcite) at the lower CO2SM concentration (0.6 g L−1) and homogeneous spherical-like (pure vaterite) at the higher CO2SM concentration (40 g L−1) for 1 h at 100 °C, in which the released EDA and/or EG from CO2SM had unexpected functions as surfactants. After the precipitation of CaCO3 crystals in 40 g L−1 CO2SM solution, the filtered solution could not only be reused to absorb CO2, but also to prepare the same crystal phase CaCO3 micro-particles repeatedly with the addition of Ca(OH)2. As a result, this novel synthesis process of CaCO3 micro-particles with CO2SM offers an alternative way for the comprehensive utilization of CO2.

A novel CCU approach of CO2 by the system 1,2-ethylenediamine+1,2-ethylene glycol

As a new, effective CO2 fixation system, 1,2-ethylenediamine and 1,2-ethylene glycol (EDA+EG) can efficiently activate CO2 and directly convert it into a novel CO2-storage material (CO2SM) with 46.3% yield. The aqueous CO2SM solution can react with Ca(OH)2-saturated limpid solution to generate morphology-controllable CaCO3 microparticles with additional CO2 bubbling and Ca(OH)2. Additionally, the aqueous EDA+EG solution could be recycled multiple times without significant loss of CO2 capturing and releasing capabilities.

Excess properties and spectroscopic studies of binary system of 1-methoxy-2-propanol + dimethyl sulfoxide at T = (298.15–318.15) K

ABSTRACT Thermophysical property data for the binary system of 1-methoxy-2-propanol (PGME) + dimethyl sulfoxide (DMSO), a potential candidate for use as the scrubbing liquid for the absorption of SO2, are lacking in the literature. This paper presents experimental data at 0.1 MPa on the density and viscosity for this binary system measured over the whole composition range at T = (298.15, 303.15, 308.15, 313.15 and 318.15) K. The extended combined uncertainty Uc with a 0.95 level of confidence for the pycnometer method and Ubbelohde viscometer used in this study is 0.002 g·cm−3 and 0.028 cm2·s−1, respectively. The PGME + DMSO system shows negative values of the excess molar volume at all temperatures and compositions. Based on UV-Vis and FTIR, the intermolecular interaction of PGME with DMSO was confirmed as hydrogen bonding between the hydroxyl hydrogen atom in PGME and the oxygen atom in DMSO.

Excess properties and spectroscopic studies of binary system 1,4-butanediol + water at T = (293.15, 298.15, 303.15, 308.15, 313.15 and 318.15) K

ABSTRACT Density and dynamic viscosity data were measured over the whole concentration range for the binary system 1,4-butanediol (1) + water (2) at T = (293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K as a function of composition under atmospheric pressure. Based on density and dynamic viscosity data, excess molar density (ρE), dynamic viscosity deviation (Δν) and excess molar volume (VmE) were calculated. From the dynamic viscosity data, excess Gibbs energies (ΔG*E), Gibbs free energy of activation of viscous flow (ΔG*), enthalpy of activation for viscous flow (ΔH*) and entropy of activation for viscous flow (ΔS*) were also calculated. The ρE, VmE, Δν and ΔG*E values were correlated by a Redlich−Kister-type function to obtain the coefficients and to estimate the standard deviations between the experimental and calculated quantities. Based on FTIR and UV spectral results, the intermolecular interaction of 1,4-butanediol with H2O was discussed.

Density, viscosity and excess properties for the binary system 2-butoxy ethanol + water at T = (298.15–318.15) K and mixture’s spectroscopic studies

ABSTRACT This report presents the density and viscosity data of binary system 2-butoxy ethanol (BOE) + water (H2O) over the entire composition range at T = (298.15, 303.15, 308.15, 313.15 and 318.15) K. On the basis of density and viscosity values, the excess molar volumes (), viscosity deviations (∆ν) and excess Gibbs free energies of activation (ΔG*E) were calculated. The computed results were fitted with the Redlich–Kister equation to derive the coefficients and estimate the standard deviations between the experimental and calculated values. The values of were negative, whereas the values of ∆ν were positive over the entire composition range. On the basis of the kinematic viscosity data, enthalpies, entropies and Gibbs energies of activation for the viscous flow were also calculated. Moreover, the intermolecular interaction of BOE with H2O was discussed on the basis of UV-Vis and FTIR spectral data.

Synthesis and Characterization of Cerium Tetraphenylporphyrin Nitrate and Molecular Recognition for NO

Cerium (III) tetraphenylporphyrin nitrate Ce(TPP)NO3 was synthesized by using mesotetraphenylporphyrin (TPP) and Ce(NO3)·6H2O in mixture solution of CHCl3 and C2H5OH (V :V =1:1). The complex was characterized by UV-Vis, FT-IR, conventional fluorescence, MALDI-TOF-MS, and 1H NMR spectral techniques. The structure of complex was proposed viaSpectral analyses, in which tetraphenylporphyrin was coordinated to a cerium ion in a tetradentate fashion, while one nitrate was coordinated to the same cerium ion. After bubbling NO to the solution of Ce(TPP)NO3 in CH2Cl2, spectral analyses suggested that Ce(TPP)NO3 could interact with NO to form a novel complex of Ce(TPP)(NO)NO3, and NO was coordinated to the center cerium ion. When nitrogen was poured into the Ce(TPP)(NO)(NO3) solution, the complex could be reduced to Ce(TPP)NO3.

A novel SO2 capture, storage and utilisation to prepare BaSO3 micro-particles

Abstract A highly efficient SO2 capture system was developed. The system consisted of equimolar ethanediamine (EDA) and ethylene glycol (EG), and could chemically transform SO2 into a novel solid material, denoted as SO2SM, under mild condition. This system showed a considerable SO2 storage capacity up to 0.7696 g/g (EDA + EG). Furthermore, the aqueous solution of SO2SM was used to prepare BaSO3 micro-particles. During the reaction, EDA and EG were released from the SO2SM and served as a directing agent and dispersant in making BaSO3 crystals that had a porous structure. Thus, the combined process enabled the comprehensive utilisation of SO2 and could convert SO2 into a value-added chemical.