首页|有序介孔硅材料的微量碳层修饰及VOCs吸附性能

有序介孔硅材料的微量碳层修饰及VOCs吸附性能

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以孔道规整的介孔分子筛SBA-15和MCM-41作为硅基材料前驱体，以蔗糖作为生物质碳源，通过化学刻蚀方法将生物质碳引入两种介孔分子筛孔道中，从而制备获得碳-介孔分子筛复合材料。通过对蔗糖浓度条件的优化，可以获得比表面积、碳含量和甲苯吸附性能最佳的碳-介孔分子筛复合材料。经由TEM-EDS图谱可以证明，碳元素均匀存在于上述两种介孔硅材料的孔道。进一步通过孔径分析，发现碳层修饰后的介孔分子筛(C@MCM和C@SBA)中微孔比例显著提升，因而其甲苯吸附容量明显高于其对应的介孔分子筛(MCM-41和SBA-15)。其中，C@SBA在5次吸脱附循环中容量基本保持不变，循环吸附性能相比C@MCM更为优越。此外，碳层修饰后的介孔分子筛具有良好的耐水性，其吸附容量不会随相对湿度的提高而大幅降低。最后，上述复合材料对其他含氧VOCs物种也具有较好的吸附性能，但对甲苯等弱极性分子的吸附效果更显著。
Carbon layer modification on the surface of ordered mesoporous silica-based materials and its VOCs adsorption
Carbon-mesoporous molecular sieve composite materials were synthesized by introducing sucrose into the channels of mesoporous molecular sieves(SBA-15 and MCM-41)followed by chemical etching at high temperatures.By optimizing the sucrose concentration,a balance between surface area,carbon content,and toluene adsorption capacity was achieved.TEM-EDS characterization confirmed that the carbon generated through chemical activation was uniformly distributed within the channels of the mesoporous molecular sieves.Additionally,pore size distribution analysis revealed a significant increase in micropore fractions in both mesoporous materials after functionalization,leading to enhanced toluene adsorption capacity.Notably,compared to C@MCM,C@SBA maintained relatively higher toluene adsorption capacity even after five adsorption-desorption cycles,which translates to a better regenerability.Alongside their excellent adsorption performance,the carbon-mesoporous molecular sieve composites also exhibited remarkable moisture resistance,with no significant decrease in performance under increased humidity.Lastly,both composite materials demonstrated good adsorption performance for other oxygen-containing VOC species,although adsorption was more favorable for nonpolar adsorbates,such as toluene.

mesoporous molecular sievespore modificationcarbon-silica compositesVOCs adsorption

柯权力、熊烨栋、卢梅、吴天浩、黄康康、闵炯、金传敏、崔国凯、赵博、卢晗锋

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浙江工业大学化学工程学院,浙江 杭州 310000

浙江德创环保科技股份有限公司,浙江绍兴 312000

浙江省环境科技有限公司,浙江 杭州 310000

浙江悦胜环境科技有限公司,浙江 湖州 313300

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介孔分子筛 孔道修饰 碳硅复合材料 VOCs吸附

浙江省"尖兵""领雁"研发攻关计划浙江省"尖兵""领雁"研发攻关计划国家自然科学基金资助项目浙江省自然科学基金资助项目浙江省属高校基本科研业务费专项浙江省博士后科研择优资助项目

2023C031272024C0311422208300LQ23B060007RF-A2023004ZJ2023145

2024

中国环境科学
中国环境科学学会

中国环境科学

CSTPCDCHSSCD北大核心
影响因子：2.174
ISSN：1000-6923
年,卷(期)：2024.44(10)