| PSS辅助水热合成分级结构纳米γ-Al2O3及其CO2吸附性能增强 |
| PSS-Assisted Hydrothermal Synthesis of Hierarchical γ-Al2O3 Nanostructures with Enhanced Adsorption Performance Towards CO2 |
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| 摘要: 以AlCl3·6H2O为铝源、CH3COOK为沉淀剂、聚苯乙烯磺酸钠(PSS)为结构调节剂,采用温和水热焙烧法成功地制备了系列对CO2吸附性能增强的分级结构纳米γ-Al2O3。采用XRD、SEM和N2吸附-脱附等手段,对比研究了PSS浓度对产物物相结构、形貌、织构性质及其在室温下对CO2吸附性能的影响。研究表明,PSS对产物形貌、织构性质及其CO2吸附性能具有明显的调控作用。不添加PSS时产物表现为不规则的块状粒子,PSS浓度依次增加到2、4和6 g·L-1后,产物分别表现为不规则的棒状团簇体微米级粒子、类球形棒状团簇体微米级粒子、相互交织的纤维状微米级粒子,并且其比表面积和孔容逐渐增加;添加PSS后产物的CO2吸附量增加、吸附动力学加快,尤其是PSS浓度为6 g·L-1时,相应产物的最高吸附量为0.68 mmol·g-1,6次循环再生后其吸附量仍基本保持稳定。 |
| 关键词: PSS 水热合成 分级结构纳米γ-Al2O3 吸附 CO2 |
| 基金项目: 国家自然科学基金(No.51272201,51142002)、教育部新世纪优秀人才支持计划(No.NCET-13-0942)、武汉市应用基础研究(No.2015060101010065)和中央高校基本科研业务费专项资金(No.2014-Ⅶ-038)资助项目 |
| Abstract: Series of hierarchical γ-Al2O3 nanostructures with enhanced adsorption performance towards CO2 were successfully synthesized via a facilely hydrothermal method-calcination route using AlCl3·6H2O as aluminum source, CH3COOK as precipitant and poly(sodium 4-styrenesulfonate) (PSS) as structure directing agent, respectively. Effects of PSS concentration on the phase structure, morphologies, textural properties of the as-prepared γ-Al2O3 and their adsorption performance towards CO2 at 25℃ were comparatively characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption techniques. It was shown that PSS plays an important role in controlling the morphologies, textural properties and adsorption performance of the γ-Al2O3. The γ-Al2O3 obtained without PSS shows irregular massive particles. With increasing its concentration to 2, 4 and 6 g·L-1, respectively, the corresponding γ-Al2O3 show irregular nanorods cluster-like micron particles, spherical-like cluster composed of nanorods and interwoven fibrous micron particles, respectively, and their specific surface area and pore volume gradually increase in turn. In comparison with the γ-Al2O3 obtained without PSS, the γ-Al2O3 obtained with PSS show higher adsorption capacity and faster adsorption kinetics. Especially, when the PSS concentration is 6 g·L-1, the γ-Al2O3 has the highest adsorption capactiy of 0.68 mmol·g-1, and shows stable adsorption capactiy after consecutive recycle times of 6. |
| Keywords: PSS hydrothermal synthesis hierarchical γ-Al2O3 nanostructure adsorption CO2 |
| 投稿时间：2016-01-31 修订日期：2016-03-19 |
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| 王文旋,蔡卫权,罗磊.PSS辅助水热合成分级结构纳米γ-Al2O3及其CO2吸附性能增强[J].无机化学学报,2016,32(5):827-832. |
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