In this work, a series of polyethyleneimine （PEI） functionalized commercial silica gel were prepared by wet impregnation method and used as CO2 sorbent. The as-prepared sorbents were characterized by N2 adsorption, ...In this work, a series of polyethyleneimine （PEI） functionalized commercial silica gel were prepared by wet impregnation method and used as CO2 sorbent. The as-prepared sorbents were characterized by N2 adsorption, FT-1R and SEM techniques. CO2 capture was tested in a fixed bed reactor using a simulated flue gas containing 15.1% CO2 in a temperature range of 25-100 ~C. The effects of sorption temperature and amine content on CO2 uptake of the adsorbents were investigated. The silica gel with a 30 wt% PEI loading manifested the largest CO2 uptake of 93.4 mgcoz/gadsorbent （equal to 311.3 mg^oz/gPEI） among the tested sorbents under the conditions of 15.1% （v/v） CO2 in N2 at 75 ~C and atmospheric pressure. Moreover, it was rather low-cost. In addition, the PEI-impregnated silica gel exhibited stable adsorption-desorption behavior during 5 consecutive test cycles. These results suggest that the PEI-impregnated silica gel is a promising and cost-effective sorbent for CO2 capture from flue gas and other stationary sources with low CO2 concentration.展开更多
将聚乙烯亚胺(PEI)接枝在硅胶上(PEI/SiO2)。先以环氧丙烷叔胺化再以氯化苄季铵化,制备了硅胶接枝的聚乙烯亚铵季铵盐水不溶抗菌材料(QPEI/SiO2)。通过红外光谱对产物的化学结构进行了表征,测定了材料的接枝率为15.7%(15.7 g PEI/100 g ...将聚乙烯亚胺(PEI)接枝在硅胶上(PEI/SiO2)。先以环氧丙烷叔胺化再以氯化苄季铵化,制备了硅胶接枝的聚乙烯亚铵季铵盐水不溶抗菌材料(QPEI/SiO2)。通过红外光谱对产物的化学结构进行了表征,测定了材料的接枝率为15.7%(15.7 g PEI/100 g SiO2),季铵化度最高为1.57 mmol/g。采用平板活菌计数法考察了QPEI/SiO2的季铵化度对大肠杆菌和金黄葡萄球菌的抗菌性能的影响规律;采用β-半乳糖苷酶活性测定法,探索了QPEI/SiO2的抗菌机理。结果表明,QPEI/SiO2抗菌材料具有较强的抗菌能力,当剂量为15 g/L时对浓度为1×109CFU/mL的金黄葡萄球菌液和大肠杆菌菌液的抗菌率分别为100%和接近100%,其抗菌性能随季铵化度的增大而增强。酶活性测定结果表明,QPEI/SiO的抗菌机理主要基于杀菌作用。展开更多
文摘In this work, a series of polyethyleneimine （PEI） functionalized commercial silica gel were prepared by wet impregnation method and used as CO2 sorbent. The as-prepared sorbents were characterized by N2 adsorption, FT-1R and SEM techniques. CO2 capture was tested in a fixed bed reactor using a simulated flue gas containing 15.1% CO2 in a temperature range of 25-100 ~C. The effects of sorption temperature and amine content on CO2 uptake of the adsorbents were investigated. The silica gel with a 30 wt% PEI loading manifested the largest CO2 uptake of 93.4 mgcoz/gadsorbent （equal to 311.3 mg^oz/gPEI） among the tested sorbents under the conditions of 15.1% （v/v） CO2 in N2 at 75 ~C and atmospheric pressure. Moreover, it was rather low-cost. In addition, the PEI-impregnated silica gel exhibited stable adsorption-desorption behavior during 5 consecutive test cycles. These results suggest that the PEI-impregnated silica gel is a promising and cost-effective sorbent for CO2 capture from flue gas and other stationary sources with low CO2 concentration.
文摘将聚乙烯亚胺(PEI)接枝在硅胶上(PEI/SiO2)。先以环氧丙烷叔胺化再以氯化苄季铵化,制备了硅胶接枝的聚乙烯亚铵季铵盐水不溶抗菌材料(QPEI/SiO2)。通过红外光谱对产物的化学结构进行了表征,测定了材料的接枝率为15.7%(15.7 g PEI/100 g SiO2),季铵化度最高为1.57 mmol/g。采用平板活菌计数法考察了QPEI/SiO2的季铵化度对大肠杆菌和金黄葡萄球菌的抗菌性能的影响规律;采用β-半乳糖苷酶活性测定法,探索了QPEI/SiO2的抗菌机理。结果表明,QPEI/SiO2抗菌材料具有较强的抗菌能力,当剂量为15 g/L时对浓度为1×109CFU/mL的金黄葡萄球菌液和大肠杆菌菌液的抗菌率分别为100%和接近100%,其抗菌性能随季铵化度的增大而增强。酶活性测定结果表明,QPEI/SiO的抗菌机理主要基于杀菌作用。
