半焦基类石墨烯材料的制备及其光催化CO_2/H_2O制甲醇性能研究
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摘要
本文以神府半焦焦粉为原料,综合采用化学氧化、冷冻干燥与高温碳化等方法,制备出半焦基类石墨烯材料。通过扫描电镜(SEM)、氮气吸附测试、傅立叶红外光谱仪(FTIR)对该半焦基类石墨烯材料的形貌结构进行了表征分析,并以单位时间内光催化还原CO_2/H_2O合成甲醇的产量评价了所制得样品的光催化性能。结果表明:半焦基类石墨烯材料不仅具有发达的孔隙结构与分布均匀的层片结构,同时表现出优异的光催化活性。以半焦基类石墨烯为光催化剂在紫外光照条件下,甲醇产量可达57.32μmol/g·cat,接近于相同条件下以TiO_2作为光催化剂时的甲醇产量。
In this paper, semi-coke based porous graphene which use the semi-coke as the raw material were prepared by chemical oxidation, freeze drying and high temperature. The morphologies and structures of the samples were analyzed by SEM, nitrogen adsorption, and FTIR. We use the output of methanol in unit time by photocatalytic CO_2 reduction to evaluate the photocatalytic properties of semi-coke based porous graphene. The results indicated that the semi-coke based porous graphene materials have distributed evenly lamellar structure, high specific surface area and conjugate structure. The cumulative output of methanol is 57.32μmol/g·cat when we use semi-coke based porous graphene materials as the photocatalyst, the output is close to the methanol production when TiO_2 is used as photocatalyst.
In this paper, semi-coke based porous graphene which use the semi-coke as the raw material were prepared by chemical oxidation, freeze drying and high temperature. The morphologies and structures of the samples were analyzed by SEM, nitrogen adsorption, and FTIR. We use the output of methanol in unit time by photocatalytic CO_2 reduction to evaluate the photocatalytic properties of semi-coke based porous graphene. The results indicated that the semi-coke based porous graphene materials have distributed evenly lamellar structure, high specific surface area and conjugate structure. The cumulative output of methanol is 57.32μmol/g·cat when we use semi-coke based porous graphene materials as the photocatalyst, the output is close to the methanol production when TiO_2 is used as photocatalyst.
引文
[1]王谋.世界排放大国CO2排放和GDP的格兰杰因果分析及其对国际气候治理的影响和意义[J].气候变化研究进展,2018,14(3).
[2]Wang Y,Cai Q,Yao M,et al.Easy Synthesis of Ordered Mesoporous Carbon-Carbon Nanotube Nanocomposite as a Promising Support for CO2Photoreduction[J].Acs Sustainable Chemistry&Engineering,2018,6(2):2529-2534.
[3]Low J,Yu J,Ho W.Graphene-Based Photocatalysts for CO2 Reduction to Solar Fuel[J].Journal of Physical Chemistry Letters,2015,6(21):4244-4251.
[4]Low J,Cheng B,Yu J.Surface modification and enhanced photocatalytic CO2 reduction performance of TiO2:a review[J].Applied Surface Science,2017,392:658-686.
[5]Hao X,Zhou J,Cui Z,et al.Zn-vacancy mediated electron-hole separation in ZnS/g-C3N4,heterojunction for efficient visible-light photocatalytic hydrogen production[J].Applied Catalysis B Environmental,2018,229.
[6]云卉.神木半焦改性及其在CO2光催化转化过程中的应用研究[D].西安科技大学,2016.
[7]郭继玺,宋贤丽,郭明晰,等.MnO2/煤基碳纳米纤维的制备及其在柔性超级电容器中的应用[J].化学通报,2016,79(10):942-946.
[8]Yang M Q,Xu Y J.Photocatalytic conversion of CO2 over graphene-based composites:Current status and future perspective[J].Nanoscale Horizons,2016,1(3):185-200.
[9]张亚婷,李可可,刘国阳,等.煤基石墨烯宏观体的制备及其在CO2光催化还原过程中的应用[J].新型炭材料,2015,30(6):539-544.
[2]Wang Y,Cai Q,Yao M,et al.Easy Synthesis of Ordered Mesoporous Carbon-Carbon Nanotube Nanocomposite as a Promising Support for CO2Photoreduction[J].Acs Sustainable Chemistry&Engineering,2018,6(2):2529-2534.
[3]Low J,Yu J,Ho W.Graphene-Based Photocatalysts for CO2 Reduction to Solar Fuel[J].Journal of Physical Chemistry Letters,2015,6(21):4244-4251.
[4]Low J,Cheng B,Yu J.Surface modification and enhanced photocatalytic CO2 reduction performance of TiO2:a review[J].Applied Surface Science,2017,392:658-686.
[5]Hao X,Zhou J,Cui Z,et al.Zn-vacancy mediated electron-hole separation in ZnS/g-C3N4,heterojunction for efficient visible-light photocatalytic hydrogen production[J].Applied Catalysis B Environmental,2018,229.
[6]云卉.神木半焦改性及其在CO2光催化转化过程中的应用研究[D].西安科技大学,2016.
[7]郭继玺,宋贤丽,郭明晰,等.MnO2/煤基碳纳米纤维的制备及其在柔性超级电容器中的应用[J].化学通报,2016,79(10):942-946.
[8]Yang M Q,Xu Y J.Photocatalytic conversion of CO2 over graphene-based composites:Current status and future perspective[J].Nanoscale Horizons,2016,1(3):185-200.
[9]张亚婷,李可可,刘国阳,等.煤基石墨烯宏观体的制备及其在CO2光催化还原过程中的应用[J].新型炭材料,2015,30(6):539-544.