Preparation and photothermal properties of r-TiO2@BCC composite materials
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% .
evaporation photothermal conversionbio mass carbonreduced TiO2solar interface water evaporation
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