Enhanced visible light photocatalytic activity of TiO2 assisted by organic semiconductors: a structure optimization strategy of conjugated polymers
Enhanced visible light photocatalytic activity of TiO2 assisted by organic semiconductors: a structure optimization strategy of conjugated polymers
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有机半导体辅助增强TiO2可见光光催化活性：共轭聚合物的结构优化策略
DOI：
10.1039/c7ta09374h
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发表时间：
2018-01-07
影响因子：
11.9
通讯作者：
Chen, Hao
中科院分区：
文献类型：
--
作者：
Xiang, Yonggang;Wang, Xuepeng;Chen, Hao
寻找高效的TiO2基异质结光催化剂用于光催化析氢和去除污染物仍然是一个巨大的挑战。在本研究中，我们将由电子供体和电子受体交替组成的线性共轭聚合物B-BT-1，4-E引入到二氧化钛表面，形成二元复合材料。在可见光(λ≥420 nm)照射下，B-BT-1，4-E/TiO2光催化剂表现出优异的光催化活性。在不添加贵金属(铂)的情况下，16.7%B-BT-1，4-E/Ti02的析氢速率(HER)达到220.4μ−1，而优化后的13.3%B-BT-1，4-E/TiO2也表现出优异的催化降解效率，动力学常数为0.232。基于UV-Vis漫反射光谱(DRS)、电子自旋共振(ESR)、光电流、电化学阻抗谱(EIS)和光致发光(PL)的表征结果，B-BT-1，4-E/TiO2光催化活性的提高归因于更宽的可见光吸收范围和更快的电荷分离和转移。此外，还提出了合理的光催化机理。与文献报道的CMP(BBT)/TiO2光催化剂相比，B-BT-1，4-E/TiO2光催化剂的HER和CIP降解动力学常数分别提高了7.3倍和3.1倍。这项研究表明，共轭聚合物的固有优点使其成为探索更有效的有机半导体-无机半导体异质结光催化剂的潜在候选者。
The search for high-efficient TiO2-based heterojunction photocatalyst for photocatalytic H2 evolution and pollutant removal remains a great challenge. In this study, linear conjugated polymer B-BT-1,4-E consisting of alternating electron donor and electron acceptor was incorporated on the surface of TiO2 to form a binary composite in the facile in situ strategy. B-BT-1,4-E/TiO2 exhibited superior photocatalytic activity under visible light irradiation (λ ≥ 420 nm). The hydrogen evolution rate (HER) of 16.7% B-BT-1,4-E/TiO2 reached 220.4 μmol h−1 without additional noble metal (Pt), and the optimized 13.3% B-BT-1,4-E/TiO2 also displayed outstanding CIP degradation efficiency with a kinetic constant of 0.232. Based on extensive characterization results from UV-Vis diffused reflectance spectra (DRS), electron spin resonance (ESR), photocurrent, electrochemical impedance spectroscopy (EIS) and photoluminescence (PL), the enhanced photocatalytic activity of B-BT-1,4-E/TiO2 heterojunction can be attributed to broader visible light absorption range, faster charge separation and transfer. Moreover, a reasonable photocatalytic mechanism is also proposed. In comparison to reported CMP(BBT)/TiO2, HER and kinetic constants of CIP degradation with B-BT-1,4-E/TiO2 as the photocatalyst were increased by 7.3 times and 3.1 times, respectively. This study demonstrated that intrinsic merits of conjugated polymers made them promising candidates for exploring more efficient organic semiconductor–inorganic semiconductor heterojunction photocatalysts.