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纳米材料与特氟龙磁力搅拌棒之间的摩擦被发现可导致磁力搅拌条件下的染料降解. 本文对磁力搅拌条件下TiO2纳米粉还原CO2进行了研究. 在充有CO2的100 mL石英反应器中, 在50 mL的水中分散1.00 g TiO2纳米粉, 经过50 h磁力搅拌可产生6.65 × 10–6 (体积分数, 下同) CO, 2.39 × 10–6 CH4和0.69 × 10–6 H2; 而如果没有TiO2纳米粉, 则只能产生2.22 × 10–6 CO和0.98 × 10–6 CH4. 对含有分散TiO2纳米粉的水同时采用4个磁力搅拌棒, 50 h磁力搅拌产生的气体进一步提高到19.94 × 10–6 CO, 2.33 × 10–6 CH4和2.06 × 10–6 H2. 基于TiO2纳米粉通过摩擦吸收机械能并被激发产生电子-空穴对, 建立了TiO2纳米粉对CO2和水还原的催化机理. 本发现表明, 纳米材料能够通过摩擦利用机械能进行CO2的还原, 从而为开发利用环境中的机械能提供了一个新的方向.The friction between some nanomaterials and teflon magnetic stirring rods has recently been found responsible for dye degradation by magnetic stirring in dark. In this work, a study is conducted on the reduction of CO2 by TiO2 nanoparticles under magnetic stirring in water. In a 100-mL reactor filled with 50-mL water, 1.00-g TiO2 nanoparticles and 1-atm CO2, 50-h magnetic stirring results in the formation of 6.65 × 10–6 (volume fraction) CO, 2.39 × 10–6 CH4 and 0.69 × 10–6 H2; while in a reactor without TiO2 nanoparticles, the same magnetic stirring leads only 2.22 × 10–6 CO and 0.98 × 10–6 CH4 to form. Four magnetic stirring rods are used simultaneously to further enhance the stirring, and 50-h magnetic stirring can form 19.94 × 10–6 CO, 2.33 × 10–6 CH4, and 2.06 × 10–6 H2. A mechanism for the catalytic role of TiO2 nanoparticles in the reduction of CO2 and H2O is established, which is based on the excitation of electron-hole pairs in TiO2 by mechanical energy absorbed through friction. This finding clearly demonstrates that nanostructured semiconductors are able to utilize mechanical energy obtained through friction to reduce CO2, thus providing a new direction for developing and utilizing the mechanical energy harvested from ambient environment.
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Keywords:
- friction /
- magnetic stirring /
- CO2 reduction /
- TiO2
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图 1 二氧化钛纳米颗粒的SEM照片
Fig. 1. An SEM micrograph taken for as-received TiO2 nanoparticles.
图 2 单个磁力搅拌棒分别搅拌50 h溶解有CO2的水及溶解有CO2并分散有TiO2纳米粉的水所产生的气体产物
Fig. 2. Gases produced from water dissolved with CO2 through 50 h magnetic stirring using a PTFE (poly tetra fluoroethylene) magnetic stirring rod. There were no TiO2 nanoparticles in water in the reference test.
图 3 分别经过50, 100, 150 h磁力搅拌的气体产物, 在磁力搅拌中同时采用4个特氟龙磁力搅拌棒
Fig. 3. Gases produced from water dissolved with CO2 through 50, 100 and 150 h, separately, magnetic stirring using four PTFE magnetic stirring rods.
图 4 生成的气体体积分数与磁力搅拌时间的关系: 对溶解有CO2并分散有TiO2纳米粉的50 mL的水采用4个特氟龙磁力搅拌棒进行搅拌
Fig. 4. Stirring time dependence of CO, CH4 and H2 produced from water dissolved with CO2 and dispersed with TiO2 nanoparticles through magnetic stirring using four PTFE magnetic stirring rods.
图 5 对含有TiO2纳米粉的苯二甲酸钠溶液在室温及黑暗条件下用4个搅拌棒磁力搅拌后的荧光光谱(激发波长为315 nm)
Fig. 5. Fluorescence spectra (excitation wavelength: 315 nm) of sodium terephthalate solution containing TiO2 nanoparticles after being magnetically stirred using four stirring rods at room temperature in dark.
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[1] 李冬冬, 王丽莉 2012 物理学报 61 034212
Google Scholar
Li D D, Wang L L 2012 Acta Phys. Sin. 61 034212
Google Scholar
[2] 李平, 李海金, 涂文广, 周勇, 邹志刚 2015 物理学报 64 094209
Google Scholar
Li P, Li H J, Tu W G, Zhou Y, Zou Z G 2015 Acta Phys. Sin. 64 094209
Google Scholar
[3] 吴化平, 令欢, 张征, 李研彪, 梁利华, 柴国钟 2017 物理学报 66 167702
Google Scholar
Wu H P, Ling H, Zhang Z, Li Y B, Liang L H, Chai G Z 2017 Acta Phys. Sin. 66 167702
Google Scholar
[4] 赵娟, 胡慧芳, 曾亚萍, 程彩萍 2013 物理学报 62 158104
Google Scholar
Zhao J, Hu H F, Zeng Y P, Cheng C P 2013 Acta Phys. Sin. 62 158104
Google Scholar
[5] 崔宗杨, 谢忠帅, 汪尧进, 袁国亮, 刘俊明 2020 物理学报 69 127706
Google Scholar
Cui Z Y, Xie Z S, Wang Y J, Yuan G L, Liu J M 2020 Acta Phys. Sin. 69 127706
Google Scholar
[6] Ran J, Jaroniec M, Qiao S Z 2018 Adv. Mater. 30 1704649
Google Scholar
[7] Kreft S, Wei D, Junge H, Beller M 2020 Energy Chem. 2 100044
Google Scholar
[8] Wang X, Li Z, Yang X 2015 J. Mol. Sci. 31 190201
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[10] 韩杰敏, 王梅, 仝召民, 马一飞 2019 无机材料学报 34 839
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Han J M, Wang M, Tong Z M, Ma Y F 2019 J. Inorg. Mater. 34 839
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Qin J M, Tian L F, Zhao D X, Jiang D Y, Cao J M, Ding M, Guo Z 2011 Acta Phys. Sin. 60 107307
Google Scholar
[13] Deng J N, Kuang X, Liu R Y, Ding W B, Wang A C, Lai Y C, Dong K, Wen Z, Wang Y X, Wang L L, Qi H J, Zhang T, Wang Z L 2018 Adv. Mater. 30 1705918
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Google Scholar
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Google Scholar
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Google Scholar
Hong Y T, Ma J P, Wu Z, Ying J S, You H L, Jia Y M 2018 Acta Phys. Sin. 67 107702
Google Scholar
[17] 徐姝雅, 刘治宏, 张淮, 于金冉 2019 化学学报 77 427
Xu S Y, Liu Z H, Zhang H, Yu J R 2019 Acta Phys. Sin. 77 427
[18] Starr M B, Shi J, Wang X D 2012 Angew. Chem. Int. Ed. 51 5962
Google Scholar
[19] You H, Wu Z, Zhang L, Ying Y, Liu Y, Fei L, Chen X, Jia Y, Wang Y, Wang F, Ju S, Qiao J, Lam C H, Huang H 2019 Angew. Chem. 58 11779
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[20] Feng W, Yuan J, Zhang L, Hu W, Wu Z, Wang X, Huang X, Liu P, Zhang S 2020 Appl. Catal. B-Environ 277 119250
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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[43] Qi Y, Park J Y, Hendriksen B L M, Ogletree D F, Salmeron M 2008 Phys. Rev. B 77 184105
Google Scholar
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Google Scholar
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Google Scholar
[46] Al-Mamoori A, Krishnamurthy A, Rownaghi A A, Rezaei F 2017 Energy Technol. 5 834
Google Scholar
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