基于碳量子点材料制备了一种新型太阳能驱动界面水蒸发系统,将碳量子点的荧光效应与光热效应集成到一个系统中。利用单宁酸(TA)和氨基硅烷化试剂(APTES)对脱木素木材表面进行修饰,使其表面呈现层级排列的球纳米颗粒,增加表面粗糙度,提高界面亲水性。然后,用聚乙烯醇(PVA)为分散剂分散碳量子点,并旋涂于脱木质素木材的上表面,PVA可以有效地阻止碳量子点发生非辐射能量转移导致的荧光猝灭。此外,通过单因素优化实验优化APTES的生长时间和浓度,获得该体系最佳的水蒸发速率和荧光强度。在1个太阳光辐照下,水蒸发速率最高达到了2.5kg/(m2·h),并且具有优异的荧光传感性能。
A novel solar-driven interfacial water evaporation system was prepared based on carbon quantum dots,which integrated the fluorescence and photothermal effects of carbon quantum dots into one system.The surface of delignified wood was modified by tannic acid (TA) and aminosilylation reagent (APTES) to make spherical nanoparticles on surface be arranged in layers,which increased the surface roughness and improved the hydrophilicity of the interface.Then,the carbon quantum dots were dispersed with polyvinyl alcohol (PVA) as a dispersant and spin-coated on the surface of delignifies wood.PVA could effectively prevent the fluorescence quenching of carbon quantum dots caused by non-radiative energy transfer.In addition,the optimal water evaporation rate and fluorescence intensity of the system were obtained by optimizing the growth time,concentration of APTES and content of carbon quantum dots through single-factor optimization experiments.Under 1 sunlight irradiation,the water evaporation rate reached a maximum of 2.5kg/(m2·h),and it had excellent fluorescence sensing performance.
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基金资助
国家自然科学基金青年基金项目(21501069)
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