JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Houde She,Man Jiang,Pengfei Yue,Jingwei Huang,Lei Wang,Jianzhang Li,Gangqiang Zhu,Qizhao Wang
The performance of BiVO 4 for photoelectrocatalytic (PEC) water decomposition is commonly limited by reaction kinetics. In this work, NiS and CoS nanospheres were respectively loaded on BiVO 4 thin films (NiS/BiVO 4 and CoS/BiVO 4 composites) to improve its reaction kinetics for PEC water decomposition. Both physical and chemical properties of these composites were characterized by XRD , SEM, TEM, PL and UV-DRS. The photoelectric properties of the samples were verified by testing LSV , i-t, EIS and IPCE. The formation of the composites can effectively prevent the recombination of carriers and consequently accelerate the separation of electrons and holes. NiS/BiVO 4 and CoS/BiVO 4 can reach photocurrent of 2.1 mA cm −2 and 2.7 mA cm −2 under light respectively, at 1.23 V vs. RHE, which are 1.75 times and 2.25 times that of BiVO 4 (1.2 mA cm −2 ). The hydrogen production of the NiS/BiVO 4 and CoS/BiVO 4 photoanodes was 4.7 and 7.3 times higher than that of BiVO 4 photoanode, respectively.
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JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Rui Xu,Zhi Wang,Ming Wang,Zhihua Qiao,Jixiao Wang
Under high nanoparticles loadings, the gas separation performance mixed matrix membranes (MMMs) could be limited by the inferior compatibility between polymer and nanoparticles. Herein, we utilized a “bridging-crosslinking” method to connect the polymer and nanoparticles via macromolecule. Specially, the poly(vinylamine) (PVAm) and UIO-66-NH 2 nanoparticles were bridging-crosslinked by using poly(ethylene glycol) diglycidyl ether (PEGDE) to achieve high nanoparticles loadings. By this way, even though the nanoparticles loadings attained 28.5 wt%, the incorporated nanoparticles still showed good dispersion in coating solution without sedimentation for one week. According to the gas permeation test, the fabricated MMMs with amounts of functional groups via “bridging-crosslinking” method displayed excellent gas separation performance and good long-term stability under the simulated flue gas . For CO 2 /N 2 (15/85) mixed gas, the MMMs can achieve a high CO 2 permeance of 1295 GPU and CO 2 / N 2 selectivity of 91 at 0.3 MPa. For CO 2 /CH 4 (10/90) mixed gas and CO 2 /H 2 (40/60) mixed gas, the gas separation performance of MMMs was investigated.
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ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Yue Yu,Xu Li,Rajamani Krishna,Yuchuan Liu,Yuanzheng Cui,Jianfeng Du,Zhiqiang Liang,Xiaowei Song,Jihong Yu
Mg, Co-substituted aluminophosphate zeolites with ERI framework topology (denoted as MgAPO-ERI and CoAPO-ERI) have been synthesized under hydrothermal conditions by using N,N,N′,N′-tetramethyl-1,6-hexanediamine as organic template. Their CO2 adsorption properties are investigated in comparison to those of the pure aluminophosphate counterpart AlPO-ERI. CoAPO-ERI shows the highest CO2 uptake of 57.3 cm3 g–1 (273 K and 1 bar) and the highest isosteric heat of 39.0 kJ mol–1 among the three samples. Importantly, the incorporation of Mg2+ and Co2+ ions in the framework of AlPO-ERI can greatly improve the adsorption selectivities of CO2 over CH4 and N2. Whereafter, transient breakthrough simulations were investigated and further proved the advantages of heteroatoms for separations. These results demonstrate that isomorphous heteroatom substitutions in aluminophosphate zeolites play a key role in enhancing CO2 adsorption and separation abilities.
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ENERGY & FUELS
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2018
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IF 3.024
Fengqin Yin,Haozhen Ou,Shuoyu Wang,Linzhou Zhuang,Zhejia Wu,Shuixia Chen
A series of mesoporous amino resins (MA) with pore diameters of 2.82 to 9.87 nm have been successfully synthesized at low temperature using poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (P123) as surfactant template via HCl catalyzed sol–gel reactions of melamine and paraformaldehyde, followed by ethanol extraction. The mesoporous amino resin MA-P123–3.5 g, prepared at optimal condition by adding 3.5 g P123 as surfactant template, had higher specific surface area of 706.7 m2/g and larger pore size of 9.87 nm. After impregnating with polyethylenimine (PEI), the obtained MA-P123–3.5 g-PEI showed the highest CO2 uptakes of 4.68 mmol/g and amine utilization efficiency of 51.48% at 40 °C, which is higher than the theoretical amine utilization efficiency (35%). The kinetics studies implied that the Avrami model could better describe the CO2 adsorption process on the MA-PEI adsorbent, indicating the synergistic effect of chemical and physical adsorption mechanisms. The further analysis of CO2 diffusion model implied that the porous structure of MA is beneficial to the diffusion of CO2 in the particles. Due to the positive influence to the amine groups of the larger pore diameter in the accessibility and diffusion process, the MA samples impregnated with PEI also showed good regeneration stability after 10 cycles of CO2 adsorption–desorption. These results are helpful for developing high-performance CO2 adsorbents.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Chongjun Zhao,Pengwei Li,Danmin Shao,Ruizhi Zhang,Shengqi Wang,Zhaoqiang Zhu,Chunhua Zhao
A phytic acid-derived Co 2-x Ni x P 2 O 7 -C/RGO composite was designed and facilely synthesized, in which phytic acid acted as both a phosphoric source and carbon source. Both carbon derived from phytic acid and reduced graphene oxide (RGO) in composite, enhanced the conductivity and thus improve its electrocatalytical capability. As-synthesized Co 1.22 Ni 0.78 P 2 O 7 -C/RGO composite exhibited excellent oxygen evolution reaction (OER) catalytic performances: At the current density of 10 mA cm −2 , only a low overpotential of 283 mV and a small Tafel slope of 51 mV dec −1 were observed. Good OER catalytic performance was retained even after 10 h continuously running at a constant voltage, which is even comparable to those of first-rate noble metal catalyst RuO 2 . In addition, the performances of Co 2-x Ni x P 2 O 7 -C/RGO catalysts were also strongly dependent on Ni content.
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Wang Shaolei,Xu Min,Peng Tianyou,Zhang Chengxin,Li Tao,Hussain Irshad,Wang Jingyu,Tan Bien
Significant efforts have been devoted to develop efficient visible-light-driven photocatalysts for the conversion of CO 2 to chemical fuels. The photocatalytic efficiency for this transformation largely depends on CO 2 adsorption and diffusion. However, the CO 2 adsorption on the surface of photocatalysts is generally low due to their low specific surface area and the lack of matched pores. Here we report a well-defined porous hypercrosslinked polymer-TiO 2 -graphene composite structure with relatively high surface area i.e., 988 m 2 g −1 and CO 2 uptake capacity i.e., 12.87 wt%. This composite shows high photocatalytic performance especially for CH 4 production, i.e., 27.62 μmol g −1 h −1 , under mild reaction conditions without the use of sacrificial reagents or precious metal co-catalysts. The enhanced CO 2 reactivity can be ascribed to their improved CO 2 adsorption and diffusion, visible-light absorption, and photo-generated charge separation efficiency. This strategy provides new insights into the combination of microporous organic polymers with photocatalysts for solar-to-fuel conversion.
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RSC Advances
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2019
·Vol. 9
·期 24
·13696-13704
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IF 3.049
Hong Lei,Ruheng Zheng,Yeping Liu,Jiacheng Gao,Xiang Chen,Xiaoliang Feng
Hydrogenation of CO2 to chemicals is of great importance in the reduction of greenhouse gas emission. And the interaction and/or the boundary between Cu and ZnO played a crucial role in the performance of the Cu–ZnO catalyst for CO2 hydrogenation to methanol. In this work, cylindrical shaped ZnO was first synthesized via controlled hydrothermal precipitation of Zn(CO2CH3)2·2H2O, and Cu was further deposited on ZnO via in situ reduction in aqueous solution. Characterizations indicated that the crystallization degree of ZnO decreased with the increasing content of Cu, while the exposed surface area of Cu exhibited a volcano shaped curve. It was found that the cylindrical shaped ZnO combined Cu catalysts were active for the hydrogenation of CO2, and the space time yield of methanol reached 0.50 g-MeOH (g-cat h)−1 at H2/CO2 = 3, 240 °C, 3.0 MPa, and 0.54 mol (g-cat h)−1, but the methanol selectivity decreases with the reduction of the (002) polar plane of ZnO. The conversion of CO2 and methanol selectivity were discussed with the detected exposed Cu surface area and the number of oxygen vacancies.
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MATERIALS RESEARCH BULLETIN
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2019
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IF 3.355
Zhen Cao,Ji Li,Li Wang,Ke Xing,Xi Yuan,Jialong Zhao,Xin Gao,Haibo Li
In this work, the effects of Co 2+ ions on the structural and luminescent properties of intrinsic and Mn doped CsPbCl 3 NCs were studied by using photoluminescence (PL) spectroscopy, X-ray diffraction (XRD) spectroscopy, and transmission electron microscopy (TEM). The undoped and Mn doped CsPbCl 3 NCs with various Co/Pb molar ratios were synthesized at 190 °C. It was found that the quantum yields of purple emissions in these CsPbCl 3 NCs were greatly enhanced up to 30% after Co 2+ ions were doped. The diffraction peaks in XRD patterns shifted to a large angle with the increase of Co/Pb molar ratio, indicating Co doping in Pb-site. Further both intrinsic and Mn doped CsPbCl 3 NCs exhibited uniform cubes with average sizes of 8–10 nm and good crystallinity after Co doping. The enhancement of purple emissions from excitons in the CsPbCl 3 NCs was related to the reduction of nonradiative defects in these NCs through Co 2+ doping.
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Chemical Engineering and Processing-Process Intensification
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2018
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IF 2.826
Dong-dong Hu,Jia-xun Lyu,Tao Liu,Mei-dong Lang,Ling Zhao
The solvation effect of compressed CO 2 on the curing reaction process of epoxy resin was investigated by using the in-situ FTIR. The isothermal curing kinetic constant and activation energy of diglycidyl ether of bisphenol A (DGEBA) with m-xylylenediamine (MXDA) was calculated via Kamal autocatalytic model. The autocatalyzed rate constants and activation energy under 0.1 MPa CO 2 are 0.7139 min −1 and 50.83 kJ/mol at 393 K, while those under 18 MPa CO 2 are 1.0928 min −1 and 36.36 kJ/mol, respectively. The increased kinetic constant and reduced activation energy suggests that the plasticization effect of CO 2 eases the chain movement, promotes the curing of epoxy resin, and increases the final conversion at relatively low temperature. Then, an amended Kamal model involving the diffusion factor was applied to better describe the curing process, which suggests that the high pressure CO 2 plays an important role to reduce the mass transfer resistance and intensify the curing process. Meanwhile, the activation energy determined by the isoconversional method, also decreases with CO 2 pressure at the same conversion. Especially, the activation energy at 90% conversion under 0.1 and 18 MPa CO 2 are 46.52 and 36.19 kJ/mol, respectively, which further confirms the solvation effect of CO 2 accelerates the curing of epoxy resin.
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JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2018
·Vol. 42
·期 7
·e13665
·
IF 1.51
Jia Liu,Liping Qiao,Xiaolin Ren,Xihong Li
Persimmons are popular worldwide owning to their unique flavor and nutritional value, while for the astringent cultivars, deastringency treatment is needed before processing. The current deastringency methods are limited to CO 2 and ethanol. The aim of this work was to select optimal deastringency methods and assess the bioavailability of polyphenols in persimmon peels treated with 12 different combination of CO 2 and ethanol. The level of soluble and insoluble tannins, total polyphenols bioaccessibility, antioxidant properties, color, and soluble solids were also determined. Results indicated that soluble tannin contents decreased with increasing ethanol concentration, and with an increase in carbon dioxide concentration, the insoluble tannins content increased. Application of 30% ethanol solution and 80% carbon dioxide for 24 hr has a best deastringency effect, while this treatment does not show good phenolics bioaccessibility and antioxidant activity. Therefore, the combination of 30% ethanol solution with 70% CO 2 fumigation for 24 hr at 10 °C is the best deastringency method. Practical applications This project invented a novel deastringency method by CO 2 and ethanol combination, with a feature of applying to lower temperature. The aim of this work was to select optimal deastringency methods and assess the bioavailability of polyphenols in persimmon peels treated with 12 different combination of CO 2 and ethanol.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Xiaofeng Li,Xiaobang Liu,Dongshun Deng
The solubility data of CO2 in four azole-based deep eutectic solvents (DESs), prepared from azoles (imidazole, Im; 1,2,4-triazole,Tri) and acetylcholine chloride (ACC), were reported at temperatures of 303.15, 313.15, 323.15, and 333.15 K under a pressure range of (20.0- 600.0) kPa using the isochoric saturation method. Henry’s constants and thermodynamic properties of standard Gibbs free energy, enthalpy, and entropy changes of CO2 dissolution were derived by correlating the data. Results demonstrated that ACC-Im DESs (Hm = 1.91–4.46 MPa·kg·mol–1) possess higher capacities of CO2 than CC-Tri ones (Hm = 2.66- 4.58 MPa·kg·mol–1). The CO2 solubility increased with rising pressure, mole ratio of Im to ACC, and decreasing temperature. All the obtained enthalpies of solution were negative. Furthermore, the comparison of dissolution capacities between present DESs and other DESs as well as some ionic liquids in the literature was conducted.
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ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Hongjie Cui,Qiming Zhang,Yuanwu Hu,Chong Peng,Xiangchen Fang,Zhenmin Cheng,Vladimir V. Galvita,Zhiming Zhou
As a potential candidate for precombustion CO2 capture at intermediate temperatures (200–400 °C), MgO-based sorbents usually suffer from low kinetics and poor cyclic stability. Herein, a general and facile approach is proposed for the fabrication of high-performance MgO-based sorbents via incorporation of CaCO3 into MgO followed by deposition of a mixed alkali metal salt (AMS). The AMS-promoted MgO–CaCO3 sorbents are capable of adsorbing CO2 at an ultrafast rate, high capacity, and good stability. The CO2 uptake of sorbent can reach as high as above 0.5 gCO2 gsorbent–1 after only 5 min of sorption at 350 °C, accounting for vast majority of the total uptake. In addition, the sorbents are very stable even under severe but more realistic conditions (desorption in CO2 at 500 °C), where the CO2 uptake of the best sorbent is stabilized at 0.58 gCO2 gsorbent–1 in 20 consecutive cycles. The excellent CO2 capture performance of the sorbent is mainly due to the promoting effect of molten AMS, the rapid formation of CaMg(CO3)2, and the plate-like structure of sorbent. The exceptional ultrafast rate and the good stability of the AMS-promoted MgO–CaCO3 sorbents promise high potential for practical applications, such as precombustion CO2 capture from integrated gasification combined cycle plants and sorption-enhanced water gas shift process.
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