Visible light responsive Zeolite/WO3–Pt hybrid photocatalysts for degradation of pollutants in air
Visible light responsive Zeolite/WO3–Pt hybrid photocatalysts for degradation of pollutants in air
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DOI：
10.1016/j.apcata.2015.12.015
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发表时间：
2016-07
影响因子：
5.5
通讯作者：
I. Jansson;K. Yoshiiri;Haruna Hori;F. J. García-García-F.-J.-García-García-1404684409;S. Rojas;B. Sánchez;B. Ohtani;S. Suárez
中科院分区：
文献类型：
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作者：
I. Jansson;K. Yoshiiri;Haruna Hori;F. J. García-García-F.-J.-García-García-1404684409;S. Rojas;B. Sánchez;B. Ohtani;S. Suárez
以WO 3和Pt为助催化剂，制备了负载于不同类型沸石上的吸附-光催化复合材料。分析了它们在紫外光和维斯光下降解污染物的性能。选择了Si/Al比在5 ~ 280之间的两种沸石（ZSM-5和Y型沸石）作为分级微孔材料作为吸附剂。铂在氧化钨上的掺入是通过光沉积方法完成的。将负载Pt的WO 3分散在沸石上并进行冻干处理。它们的光催化性能对代表性污染物的减排，乙酸、乙醛和三氯乙烯在间歇和连续流光反应器中在不同操作条件下进行分析。采用N2吸附-脱附、XRD、UV-vis、XPS和TEM等手段对原料和复合光催化剂进行了表征。在动态条件下研究了光催化剂对选定污染物的吸附能力。光催化剂的结构性质不是影响其吸附能力的主要因素。在沸石上引入WO 3-Pt导致维斯光响应材料。在所有沸石材料中均发现了单斜晶相WO 3。在沸石Y上检测到大的WO 3-Pt聚集体（约100 μ g/g）。300 nm），与ZSM-5（SiO2/Al 2 O3 = 280）的高分散相相比，具有低的Si/Al含量（约300 nm）。100 nm）。在维斯光照射下，所有的WO 3-Pt杂化分子筛均表现出光催化降解所研究的污染物的活性，改善了裸WO 3-Pt的性能。在这项工作中所示的结果揭示的影响的疏水性的硅质材料的反应中间体或副产物的吸附，并作为一个结果，在静态条件下的CO2形成率的测定。根据Si/Al比和BET比表面积的变化，提出了AF（Static）函数，用以描述复合材料在静态和动态条件下CO2释放量的变化趋势。
Adsorbent–photocatalyst hybrids based on WO3and Pt as cocatalyst immobilized on different type of zeolites were prepared. Their performance for the degradation of pollutants under UV and Vis light was analyzed. Two types of zeolites (ZSM-5 and Zeolite Y) with Si/Al ratios ranging between 5 and 280 were selected as hierarchical microporous materials acting as adsorbents. The incorporation of platinum on tungsten oxide was done by means of the photodeposition method. Pt-loaded WO3was dispersed on the zeolites and subjected to a lyophilization process. Their photocatalytic properties towards the abatement of representative pollutants e.g., acetic acid, acetaldehyde and trichloroethylene, were analyzed under different operating conditions in batch and continuous flow photoreactors. Raw materials and hybrid photocatalysts were characterized by N2adsorption–desorption, XRD, UV–vis spectroscopy, XPS and TEM microscopy. The adsorption ability of the photocatalysts towards the selected pollutants was studied under dynamic conditions. The textural properties of the photocatalysts were not the main factor controlling their adsorption ability. The incorporation of WO3–Pt on the zeolite results in Vis light responsive materials. Monoclinic WO3crystal phase was identify in all zeolitic materials. Large WO3–Pt aggregates were detected on Zeolite Y (ca. 300 nm) with low Si/Al content in contrast with highly disperse phase for ZSM-5 (SiO2/Al2O3= 280) (ca. 100 nm). All WO3–Pt hybridized zeolites showed photoactivity for the degradation of the studied pollutants under Vis light, improving the performance of bare WO3–Pt. The results shown in this work reveal the influence of the hydrophobicity of the siliceous material for the adsorption of reaction intermediates or byproducts and as a consequence for the determination of the rates of CO2formation under static conditions. AF(Static) function, dependent of the Si/Al ratio and the BET area, to correlate the difference trend of the amount of CO2released produced by the hybrid composites, under static and dynamic conditions is proposed.