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太原理工大学《Langmuir》:多重结工程耦合局部伯努利效应,强化传质高效光催化制过氧化氢

  • 2026-05-19 18:30:08
太原理工大学《Langmuir》:多重结工程耦合局部伯努利效应,强化传质高效光催化制过氧化氢

1成果简介 

过氧化氢(H2O2)是环境友好型氧化剂与可再生能源载体,太阳光驱动光催化合成H2O2为替代传统高能耗、高污染蒽醌法提供了绿色路径。然而,光催化体系常受限于反应物传输慢、光生载流子复合快、产物脱附受阻等低效传质问题,协同调控上述过程仍是领域难点。

本文,太原理工大学郭绍晖、张献明团队在国际期刊《Langmuir发表题“Enhanced Mass Flow for the Improvement of Photocatalytic Hydrogen Peroxide Production Based on Multiple Junction Engineering and Local Bernoulli Effect”的论文,第一作者为硕士生赵伟研究通过分步沉积策略,设计并制备出花球状Au/Ni-MOF/CdS三元光催化剂,将局域伯努利效应与多重结工程相结合,协同优化光催化产H2O2全过程的物质传递与电荷迁移。

值得注意的是,该Au/Ni-MOF/CdS三元光催化剂在可见光下展现出5564 μmol g-1 h-1的超高过氧化氢产率,同时在室外自然太阳光下仍保持2132.88 μmol g-1 h-1的稳定产率。同时具备优异的光响应与电荷分离能力,瞬态光电流密度显著优于单一组分,实现300-800 nm全光谱吸收。此外,该催化剂还表现出出色的结构稳定性,经过12 h循环测试与14 h室外自然光反应后,晶体结构与催化活性无明显衰减。令人印象深刻的是,该体系通过多重结工程耦合局域伯努利效应,同步强化载流子分离与界面传质,实现了催化动力学与传质动力学的双重提升。

1.催化剂设计与制备思路

研究以二维Ni-MOF为基底,采用两步原位负载构建三元复合体系:(1)采用NaBH4还原法,在Ni-MOF纳米片表面负载尺寸可控的Au NPs;(2)通过油浴原位沉积,将CdS纳米颗粒精准锚定在Au/Ni-MOF表面,实现三组分组装与紧密界面接触。

该花球分级结构形成微纳通道,可触发局域伯努利效应,显著强化催化剂-液界面的反应物与产物传质;同时在界面构筑Au/Ni-MOF肖特基结与CdS/Ni-MOF II-型异质结,建立多通道电荷转移路径,高效分离并定向迁移光生载流子,抑制复合。

2图文导读  

1. Au/Ni-MOF/CdS三元材料的制备与微观结构表征。(a)两步沉积法制备复合材料的示意图;(b)、(c)、(d)复合材料的扫描和投射图像;(e-j)复合材料的eds图像。

SEMTEM证实材料保持Ni-MOF花状形貌,HRTEM清晰显示CdS001)、(110)晶面与Au111)晶面的晶格条纹;EDS面扫表明CONiSCdAu元素均匀分布,三元体系成功合成。

2. 复合材料的宏观结构表征。

XRD确认Ni-MOF、六方CdSAu的特征结构;FT-IR表明负载AuCdS后,Ni-MOF骨架与官能团保持完整;XPS结合能系统性偏移,直接证明组分间发生强界面电荷转移。

3. 伯努利效应过程演示、光电性质分析及电子转移机制。

COMSOL有限元模拟证实,花球通道内流体流速提升、静压降低,局域伯努利效应有效加速H2OO2的对流传输;UV-Vis漫反射表明,Au/NiMOF/CdS实现300-800 nm全光谱吸收;Tauc图则直接证明Ni-MOFCdS形成了Ⅱ-型异质结;另外瞬态光电流测试表明复合材料具有显著的可见光响应。原位XPS直接表明了复合材料在反应过程中的电子转移情况。

4. 光催化性能及对比。

复合材料展现了最高的产H2O2的性能以及稳定性,对比近五年文献报道的MOF基光催化剂,本文展现出来的性能优势突出。

5. 户外光催化实验与性能展示。

在室外自然太阳光持续光照下,产率稳定达2132.88 μmol g-1 h-1,且稳定性测试表明催化活性无明显降低,复合催化剂结构保持稳定。

3小结 

总而言之,本研究以二维花球状Ni-MOF为基底,通过分步沉积策略原位负载Au纳米颗粒与CdS组分,成功构建了Au/Ni-MOF/CdS三元复合光催化剂。该策略将多重结工程与局域伯努利效应有机结合,同步强化光生载流子分离与界面反应物传质效率,有效解决了传统MOF基光催化体系传质受限、载流子复合严重、可见光利用不足等关键问题,为高效、稳定光催化过氧化氢绿色合成提供了新的设计思路与可行方案。

文献:

DOI:10.1021/acs.langmuir.5c06117

往期精彩回顾
东北林业大学《EEM》:一种自支撑、层级多孔NiFe@碳电容阳极,增强微生物燃料电池中的发电和储存能力
北京化工大学《Fuel》:金属铋嵌入的中空介孔碳用于高选择性2e-ORR制备过氧化氢
宁波大学等《Nano Lett》:柔性3D-石墨烯/锗异质结,实现380–1850nm超宽带光电探测

来源:文章来自Langmuir网站,由材料分析与应用整理编辑。

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  1. CONNECT:[ UseTime:0.001011s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001569s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000737s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000696s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001345s ]
  6. SELECT * FROM `set` [ RunTime:0.000631s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001848s ]
  8. SELECT * FROM `article` WHERE `id` = 506013 LIMIT 1 [ RunTime:0.001355s ]
  9. UPDATE `article` SET `lasttime` = 1779426431 WHERE `id` = 506013 [ RunTime:0.001842s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000735s ]
  11. SELECT * FROM `article` WHERE `id` < 506013 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001162s ]
  12. SELECT * FROM `article` WHERE `id` > 506013 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001688s ]
  13. SELECT * FROM `article` WHERE `id` < 506013 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002448s ]
  14. SELECT * FROM `article` WHERE `id` < 506013 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003769s ]
  15. SELECT * FROM `article` WHERE `id` < 506013 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003068s ]
0.189721s