Preparation of BiOBr/Bi composite photothermal powder and its interfacial photothermal driven water evaporation performance
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摘要: 针对太阳能转化应用，溴氧化铋(BiOBr)光催化性能优异，但其光热性能及应用有待研究开发。首先采用水热法制备了BiOBr纳米片粉末，然后利用硼氢化钠(NaBH4)对BiOBr粉末进行化学还原。样品表征结果显示，随着硼氢化钠浓度增加，致密的BiOBr纳米片首先转变为BiOBr/Bi复合多孔纳米片，然后转变为金属Bi多孔纳米片。金属Bi及多孔结构的形成有助于提升材料的光吸收性能及比表面积。经过20 g·L−1 NaBH4溶液还原得到的BiOBr/Bi多孔纳米片具有最优的光吸收性能和比表面积，且润湿性能优异。光热驱动水蒸发测试结果表明，20 g·L−1 NaBH4还原得到的BiOBr/Bi复合多孔纳米片具有最优的光热驱动水蒸发性能，水蒸发速率可达2.18 kg·m−2·h−1，为纯BiOBr纳米片的2倍。Abstract: With regarding to the solar energy conversion applications, BiOBr demonstrated superior photocatalytic property, while its photothermal property and application need further investigation and exploitation. Firstly, BiOBr nanosheets were prepared by hydrothermal method, and then the BiOBr nanopowders were chemically reduced by sodium borohydride. The characterization results show that, with the concentration of sodium borohydride increased, the dense BiOBr nanosheets initially transform into BiOBr/Bi composite porous nanosheets, and then metallic Bi porous nanosheets. The formation of metallic Bi and porous structure is benefit for improving the light absorption ability and specific surface area. The BiOBr/Bi composite porous nanosheets, which are obtained by reduction using 20 g·L−1 NaBH4 solution, possess the best light absorption ability and specific surface area, and the wetting property is also excellent. It therefore demonstrate the best interfacial photothermal driven water evaporation performance. The water evaporation rate reach to 2.18 kg·m−2·h−1, which is twice that of BiOBr nanosheets.
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图 1 (a)样品及光热薄膜的制备示意图；(b)光热驱动水蒸发实验示意图
Figure 1. Schematic diagram of the preparation of samples and photothermal film (a) and photothermal driven water evaporation setup (b)
BiOBr/Bi-5—BiOBr is chemically reduced by NaBH4 with concentration of 5 g·L−1
图 3 BiOBr/Bi-20样品的XPS宽图谱(a)及高分辨窄图谱((b)~(d))
Figure 3. Wide-scanning (a) and nearrow-scanning ((b)-(d)) XPS spectras of BiOBr/Bi-20 sample
图 4 BiOBr和BiOBr/Bi样品的TEM图像：(a) BiOBr；(b) BiOBr/Bi-5；(c) BiOBr/Bi-20；(d) BiOBr/Bi-50；(e) BiOBr/Bi-100
Figure 4. TEM images of BiOBr and BiOBr/Bi samples: (a) BiOBr; (b) BiOBr/Bi-5; (c) BiOBr/Bi-20; (d) BiOBr/Bi-50; (e) BiOBr/Bi-100
图 5 BiOBr和BiOBr/Bi样品的SEM图像：(a) BiOBr；(b) BiOBr/Bi-5；(c) BiOBr/Bi-20；(d) BiOBr/Bi-50；(e) BiOBr/Bi-100
Figure 5. SEM images of BiOBr and BiOBr/Bi samples: (a) BiOBr; (b) BiOBr/Bi-5; (c) BiOBr/Bi-20; (d) BiOBr/Bi-50; (e) BiOBr/Bi-100
图 6 BiOBr、BiOBr/Bi-20和BiOBr/Bi-100的氮气吸附-脱附等温线
Figure 6. N2 adsorption and desorption isotherms of BiOBr, BiOBr/Bi-20 and BiOBr/Bi-100
图 7 BiOBr和BiOBr/Bi样品的紫外-可见-近红外吸收光谱图
Figure 7. UV-Vis-NIR absorption spectra of BiOBr and BiOBr/Bi samples
图 8 负载有BiOBr/Bi-5 ((a)~(c))、BiOBr/Bi-20 ((d)~(f))和 BiOBr/Bi-100 ((g)~(i))的滤膜在不同时刻的接触角照片
Figure 8. The contact angle images for filter membranes with BiOBr/Bi-5 ((a)-(c)), BiOBr/Bi-20 ((d)-(f)) and BiOBr/Bi-100 ((g)-(i))
图 9 负载有BiOBr和BiOBr/Bi样品滤膜的光热驱动水蒸发性能对比：(a)水蒸发量-时间关系图；(b)水蒸发速率对比图；(c)滤膜表面温度-时间关系图；(d) 30 min时各滤膜表面的红外热成像照片
Figure 9. Photothemal water evaporation properties for filter membranes with BiOBr and BiOBr/Bi samples: (a) Evaporated water-time diagram; (b) Comparison of water evaporation rates; (c) Surface temperature of filter membranes-time diagram; (d) Infrared thermal images of each membrane surface at 30 min
图 10 50次循环使用过程中负载BiOBr/Bi-20滤膜的光热驱动水蒸发速率
Figure 10. Photothermal driven water evaporation rates for BiOBr/Bi-20 loaded filter membrane during 50 cycles test
表 1 BiOBr和BiOBr/Bi样品中BiOBr和Bi的晶粒大小
Table 1. Grain size of BiOBr and Bi in BiOBr and BiOBr/Bi samples
BiOBr BiOBr/Bi-5 BiOBr/Bi-20 BiOBr/Bi-50 BiOBr/Bi-100 BiOBr grain size/nm 27.28 23.12 9.47 - - Bi grain size/nm - - 19.52 18.66 17.87 
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