The adsorption of CO2can be enhanced through loading amines on adsorbents,therefore,the separation of CO2from other gases is promoted.Water plays an important role in this process.Water increases both the adsorption a...The adsorption of CO2can be enhanced through loading amines on adsorbents,therefore,the separation of CO2from other gases is promoted.Water plays an important role in this process.Water increases both the adsorption amount of CO2and the separation coefficient with N2for all amines loaded.However,the effect of loading trialkylamines is not remarkable in the absence of water.The effect of loading dialkylamine does not depend on water,but the adsorbent cannot be regenerated at ambient temperature.In comparison,an adsorbent loading trialkylamine can be regenerated at ambient temperature even in the presence of water with fairly good stability.展开更多
目的研究在纳米纤维表面共培养人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVECs)对人和大鼠骨髓间充质干细胞(human and rat bone marrow mesenchymal stem cells,hMSCs and rMSCs)向成骨,成血管分化的影响,为骨组织...目的研究在纳米纤维表面共培养人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVECs)对人和大鼠骨髓间充质干细胞(human and rat bone marrow mesenchymal stem cells,hMSCs and rMSCs)向成骨,成血管分化的影响,为骨组织工程血管化及骨快速修复提供方法。方法将聚乳酸-羟基乙酸共聚物[poly(lactic-co-glycolic acid),PLGA]静电纺丝纳米纤维进行氨气等离子体处理来接枝氨基基团,用扫描电子显微镜(scanning electronic microscopy,SEM)观察处理前后纤维形貌变化及直径分布;将HUVECs与hMSCs和rMSCs共培养(hMIX,rMIX)于修饰前后的PLGA纳米纤维表面,在培养1,3(4),7 d后用细胞计数试剂盒(cell counting kit-8,CCK-8)检测细胞增殖,培养14 d后CD31免疫荧光染色检测成血管分化情况,培养21 d后茜素红S(alizarin red S,ARS)染色钙结节检测成骨分化情况。结果SEM形貌观察结果显示经氨气等离子体处理后PLGA纳米纤维的直径及粗糙度略有增加;CCK-8结果显示氨基修饰后的纳米纤维表面更有利于rMIX的黏附和增殖,而对于hMIX的黏附和增殖影响很小;ARS染色结果显示氨基修饰的表面可以促进rMSCs成骨分化,而对hMSCs影响不大;CD31染色结果显示,HUVECs共培养及氨基修饰纳米纤维可以促进hMSCs成血管分化,而对rMSCs成血管分化没有促进作用。结论氨基修饰的纳米纤维表面培养hMSCs-HUVECs可以有效促进组织工程骨血管化,在骨组织工程中有一定的应用前景。展开更多
Carbon dioxide （CO2） adsorption on a standard metal-organic framework Mg2（dobdc） （Mg/DOBDC or Mg-MOF-74） and a tetraethylenepentamine （TEPA） modified Mgz（dobdc） （TEPA-Mg/DOBDC） were investigated and compar...Carbon dioxide （CO2） adsorption on a standard metal-organic framework Mg2（dobdc） （Mg/DOBDC or Mg-MOF-74） and a tetraethylenepentamine （TEPA） modified Mgz（dobdc） （TEPA-Mg/DOBDC） were investigated and compared. The structural information, surface chemistry and thermal behavior of the adsorbent samples were characterized by X-ray powder diffraction （XRD）, infrared spectroscopy （IR）, thermogravimetric analysis （TGA） and nitrogen adsorption-desorption isotherm analysis. CO2 adsorption capacity was measured by dynamic adsorption experiments with N2-CO2 mixed gases at 60℃. Results showed that the CO2 adsorption capacity of Mg/DOBDC was significantly improved after amine modification, with an increase from 2.67 to 6.06 mmol CO2/g adsorbent. Moreover, CO2 adsorption on the TEPA-Mg/DOBDC adsorbent was promoted by water vapor, and the adsorption capacity was enhanced to 8.31 mmol CO2/g absorbent. The adsorption capacity of the TEPA-Mg/DOBDC adsorbent dropped only 3% after 5 consecutive adsorption]desorption cycles. Therefore, this kind of adsorbent can be considered as a promising material for the capture of CO2 from flue gas.展开更多
Carbon dioxide （CO2） adsorption on a standard metal-organic framework MIL-101 and a pentaethylenehexamine modified MIL-101 （PEHA- MIL-101） are investigated and compared in this study. The adsorbent samples were ch...Carbon dioxide （CO2） adsorption on a standard metal-organic framework MIL-101 and a pentaethylenehexamine modified MIL-101 （PEHA- MIL-101） are investigated and compared in this study. The adsorbent samples were characterized by XRD, FT-IR and nitrogen adsorption- desorption isotherms analysis. CO2 adsorption capacity was measured by a volumetric method. MIL-101 and PEHA-MIL-101 exhibited CO2 adsorption capacities of 0.85 and 1.3 mmO1CO2/gadsorbent at 10 bar and 298 K, respectively. It is observed that CO2 adsorption capacity was fairly improved about 50% after amine modification.展开更多
基金Supported by National Natural Science Foundation of China(No.20876114)
文摘The adsorption of CO2can be enhanced through loading amines on adsorbents,therefore,the separation of CO2from other gases is promoted.Water plays an important role in this process.Water increases both the adsorption amount of CO2and the separation coefficient with N2for all amines loaded.However,the effect of loading trialkylamines is not remarkable in the absence of water.The effect of loading dialkylamine does not depend on water,but the adsorbent cannot be regenerated at ambient temperature.In comparison,an adsorbent loading trialkylamine can be regenerated at ambient temperature even in the presence of water with fairly good stability.
文摘目的研究在纳米纤维表面共培养人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVECs)对人和大鼠骨髓间充质干细胞(human and rat bone marrow mesenchymal stem cells,hMSCs and rMSCs)向成骨,成血管分化的影响,为骨组织工程血管化及骨快速修复提供方法。方法将聚乳酸-羟基乙酸共聚物[poly(lactic-co-glycolic acid),PLGA]静电纺丝纳米纤维进行氨气等离子体处理来接枝氨基基团,用扫描电子显微镜(scanning electronic microscopy,SEM)观察处理前后纤维形貌变化及直径分布;将HUVECs与hMSCs和rMSCs共培养(hMIX,rMIX)于修饰前后的PLGA纳米纤维表面,在培养1,3(4),7 d后用细胞计数试剂盒(cell counting kit-8,CCK-8)检测细胞增殖,培养14 d后CD31免疫荧光染色检测成血管分化情况,培养21 d后茜素红S(alizarin red S,ARS)染色钙结节检测成骨分化情况。结果SEM形貌观察结果显示经氨气等离子体处理后PLGA纳米纤维的直径及粗糙度略有增加;CCK-8结果显示氨基修饰后的纳米纤维表面更有利于rMIX的黏附和增殖,而对于hMIX的黏附和增殖影响很小;ARS染色结果显示氨基修饰的表面可以促进rMSCs成骨分化,而对hMSCs影响不大;CD31染色结果显示,HUVECs共培养及氨基修饰纳米纤维可以促进hMSCs成血管分化,而对rMSCs成血管分化没有促进作用。结论氨基修饰的纳米纤维表面培养hMSCs-HUVECs可以有效促进组织工程骨血管化,在骨组织工程中有一定的应用前景。
文摘Carbon dioxide （CO2） adsorption on a standard metal-organic framework Mg2（dobdc） （Mg/DOBDC or Mg-MOF-74） and a tetraethylenepentamine （TEPA） modified Mgz（dobdc） （TEPA-Mg/DOBDC） were investigated and compared. The structural information, surface chemistry and thermal behavior of the adsorbent samples were characterized by X-ray powder diffraction （XRD）, infrared spectroscopy （IR）, thermogravimetric analysis （TGA） and nitrogen adsorption-desorption isotherm analysis. CO2 adsorption capacity was measured by dynamic adsorption experiments with N2-CO2 mixed gases at 60℃. Results showed that the CO2 adsorption capacity of Mg/DOBDC was significantly improved after amine modification, with an increase from 2.67 to 6.06 mmol CO2/g adsorbent. Moreover, CO2 adsorption on the TEPA-Mg/DOBDC adsorbent was promoted by water vapor, and the adsorption capacity was enhanced to 8.31 mmol CO2/g absorbent. The adsorption capacity of the TEPA-Mg/DOBDC adsorbent dropped only 3% after 5 consecutive adsorption]desorption cycles. Therefore, this kind of adsorbent can be considered as a promising material for the capture of CO2 from flue gas.
文摘Carbon dioxide （CO2） adsorption on a standard metal-organic framework MIL-101 and a pentaethylenehexamine modified MIL-101 （PEHA- MIL-101） are investigated and compared in this study. The adsorbent samples were characterized by XRD, FT-IR and nitrogen adsorption- desorption isotherms analysis. CO2 adsorption capacity was measured by a volumetric method. MIL-101 and PEHA-MIL-101 exhibited CO2 adsorption capacities of 0.85 and 1.3 mmO1CO2/gadsorbent at 10 bar and 298 K, respectively. It is observed that CO2 adsorption capacity was fairly improved about 50% after amine modification.
