Synthesis of Cs3PMo12O40/Bi2O3 composite with highly enhanced photocatalytic activity under visible-light irradiation
Synthesis of Cs3PMo12O40/Bi2O3 composite with highly enhanced photocatalytic activity under visible-light irradiation
复制标题
可见光照射下光催化活性显着增强的 Cs3PMo12O40/Bi2O3 复合材料的合成
DOI：
10.1016/j.jcis.2018.01.065
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发表时间：
2018
影响因子：
9.9
通讯作者：
Yi Zhang
中科院分区：
文献类型：
--
作者：
Qi Wang;Enqin Liu;Chenlu Zhang;Siwei Huang;Yanqing Cong;Yi Zhang
采用简单的溶解-沉淀法制备了一种新型可见光活性Cs3PMo12O40/Bi2O3(CsPMo/Bi2O3)复合材料。用X射线衍射仪、X射线光电子能谱、傅立叶变换红外光谱、扫描电子显微镜、紫外-可见吸收光谱、氮气吸附-脱附等温线和电化学分析对样品进行了表征。结果表明，微量CsPMo成功地修饰了Bi2O3光催化剂。添加H3PMo12O40酸(HPMo)后，Bi2O3的表面可以变得粗糙。随后，Cs2CO3的存在可以中和HPMo的质子，形成CsPMo在Bi2O_3上析出。与裸Bi2O3和CsPMo相比，二元复合材料在电荷产生和电荷分离方面表现出许多有利的特性，如形成p-n异质结，减小带隙，增强光电流响应，大大降低电荷转移电阻。通过在可见光下降解苯酚来评价所制备样品的光催化活性。苯酚降解的准一级速率常数分别是Bi2O3和CsPMo的2.7倍和14.8倍。当采用最佳的CsPMo/Bi2O3复合材料(2.5%CsPMo)时，可以显著提高光催化性能。参与降解过程的主要活性物种顺序为：超氧阴离子自由基(O2·点−)和GT；羟基自由基(点OH) ≈ 空穴(h+)。此外，CsPMo/Bi2O3复合材料在循环实验中也表现出良好的稳定性。
A novel visible-light-active Cs3PMo12O40/Bi2O3(CsPMo/Bi2O3) composite was prepared by a simple dissolution-precipitation method. The as-prepared samples were characterized by XRD, XPS, FT-IR, SEM, UV–Vis DRS, N2adsorption-desorption isotherms and electrochemical analysis. The results revealed that Bi2O3was successfully modified by trace CsPMo. After the addition of H3PMo12O40acid (HPMo), the surface of Bi2O3can be roughed. Subsequently, the presence of Cs2CO3can neutralize the protons of HPMo forming CsPMo precipitate on Bi2O3. Comparing to naked Bi2O3and CsPMo, the binary composite exhibited many beneficial characteristics in charge generation and separation, such as formation of p-n heterojunction, decreased band gap, enhanced photocurrent response and greatly reduced charge transfer resistance. The photocatalytic activities of the as-prepared samples were evaluated by the degradation of phenol under visible light. The calculated pseudo-first-order rate constants for phenol degradation were 2.7 and 14.8 times relative to that on Bi2O3and CsPMo, respectively. Dramatically enhanced photocatalytic performance can be observed when the optimal CsPMo/Bi2O3composite (2.5% CsPMo) was applied. The major active species involved in the degradation process are in the following order: superoxide radical (O2radical dot−) > hydroxyl radical (radical dotOH) ≈ hole (h+). Besides, the CsPMo/Bi2O3composite also displayed good stability in cyclic experiments.