r-TiO2@BCC复合材料的制备及光热性能研究
Preparation and photothermal properties of r-TiO2@BCC composite materials
贾怡颖 1张畅 2赵锦博 2傅馗桁 2张艳辉2
作者信息
- 1. 浙大宁波理工学院生物与化学工程学院,浙江 宁波 315199;浙江大学化学工程与生物工程学院,浙江 杭州 310058
- 2. 浙大宁波理工学院生物与化学工程学院,浙江 宁波 315199
- 折叠
摘要
太阳能驱动的界面水蒸发是一种高效、可持续性的海水淡化、废水处理方法,在缓解淡水资源匮乏和能源危机方面具有巨大潜力,成为研究热点.本文以NaBH4为还原剂,将纳米TiO2高温还原为还原态(黑色)TiO2,并负载于碳化玉米芯.研究了玉米芯不同碳化温度与还原态TiO2 负载量对复合材料光热蒸发能力的影响.通过扫描电子显微镜(SEM)、紫外-可见-近红外分光光度计(UV-Vis-NIR)等对r-TiO2@BCC复合材料的形貌结构、光吸收率等进行了表征.结果表明:将含有氧空位的还原态TiO2负载于丰富孔道结构的碳化玉米芯,可获得显著的光热转换及水蒸发性能.在1 kW/m2模拟太阳光照射1h的条件下,玉米芯碳化温度为700℃、还原态TiO2的负载量为0.18 g时,r-TiO2@BCC复合材料水蒸发速率为2.18 kg/(m2·h),光热转换效率为89.28%.
Abstract
Solar-driven interface water evaporation is an efficient and sustainable method for seawater desalination and wastewater treatment,with great potential in alleviating freshwater resource scarcity and energy crisis.It has become a research hotspot.In this paper,nano TiO2 was reduced to the reduced state(black)TiO2 at high temperature using NaBH4 as reducing agent,and was loaded on carbonized corn cob.The effect of different carbonization temperatures and reduced TiO2 loading on the photothermal evaporation ability of composite materials was studied using corncob.The morphology,structure,and light absorption rate of the composite material,r-TiO2@BCC,were characterized by scanning electron microscopy(SEM),ultraviolet-visible near-infrared spectrophotometry(UV-Vis-NIR).The results show that loading reduced TiO2 containing oxygen vacancies onto carbonized corncob with rich pore structures can achieve significant photothermal conversion and water evaporation performance.When the carbonization temperature of corncob is 700℃and the loading amount of reduced TiO2 is 0.18 g under simulated sunlight irradiation of 1 kW/m2 for 1 h,the water evaporation rate of r-TiO2@BCC is 2.18 kg/(m2·h),and the photothermal conversion efficiency is 89.28% .
关键词
光热转换/生物质碳/还原态TiO2/太阳能界面水蒸发Key words
evaporation photothermal conversion/bio mass carbon/reduced TiO2/solar interface water evaporation引用本文复制引用
出版年
2025
NETL
NSTL
万方数据