竹基纳米纤维素/CNT-COOH复合气凝胶的制备及光热性能研究

Preparation and Photothermal Properties of Bamboo-Based Nanocellulose/CNT-COOH Composite Aerogel

竹子是世界上生长速度最快的植物之一,随着竹产量的增加,加工时产生的竹粉等废弃物也会相应增多。合理利用这些竹废弃物,不仅节约资源,促进绿色、可持续发展,还能提高竹资源利用率。本文采用竹粉为基本原料,通过TEMPO氧化法制备竹纳米纤维素(CNF),利用定向冻结技术与光热材料羧化碳纳米管(CNT-COOH)制备复合气凝胶,并探索其光热性能。其中CCA4(CNT-COOH与CNF质量比=1∶4,葡萄糖醛酸钠质量分数44.4%)表现优秀,其吸光率最高达97.4%,最高蒸发速率达到1.28 kg/(m^(2)·h),其光热转换效率为78.41%。

Bamboo is one of the fastest growing plants in the world,and as bamboo production increases,so does the amount of waste such as bamboo powder produced during processing.Rational utilization of these bamboo wastes can not only save resources,promote green and sustainable development,but also improve the utilization rate of bamboo resources.In this paper,bamboo nanoculose(CNF)is prepared by TEMPO oxidation method using bamboo powder as the basic raw material.A composite aerogel is prepared by directional freezing technique and carboxylated carbon nanotubes(CNT-COOH),and its photothermal properties are explored.Among them,CCA4(mass ratio of CNTCOOH to CNF is 1 to 4,mass fraction of sodium glucuronate 44.4%)has excellent performance,with the highest light absorption rate of 97.4%,the highest evaporation rate of 1.28 kg/(m^(2)·h)under actual conditions,and the photothermal conversion efficiency of 78.41%.