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ZnO nanoparticles implanted in TiO_2 macrochannels as an effective direct Z- scheme heterojunction photocatalyst for degradation of RhB

机译:ZnO纳米粒子作为一种有效的直接Z方案异质结光催化剂植入TiO_2大通道中,用于降解RhB

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A ZnO/TiO2 heterojunction photocatalyst based on ZnO nanoparticles embedded in the hierarchically structured TiO2 framework containing parallel macroporous channels and thin mesoporous walls has been synthesized by a common calcination treatment using zinc chloride and tetrabutyl titanate as the raw materials. The materials properties of the ZnO/TiO2 heterojunction photocatalysts have been carefully characterized with SEM/TEM, XRD, FTIR, XPS, BET analyses, UV-Vis absorption and photoluminescence spectroscopy. The photocatalytic performance for decomposition of Rhodamine B (RhB) under UV light irradiation has been systematically investigated in correlation with the materials structures. The apparent RhB degradation rate constant (k) has been determined to be 20.7 x 10(-3) min(-1) for the optimal hybrid photocatalyst with 5 wt% of ZnO loading, significantly higher that of pure TiO2 (12.2 x 10(-3) min(-1)) and pure ZnO nanoparticles (5.7 x 10(-3) min(-1)), respectively. Active species trapping experiments reveal that center dot OH and center dot O2(-) play the major roles in the photocatalytic reactions. The enhanced performance can be ascribed to the formation of a direct Z-scheme heterojunction structure between ZnO and TiO2 in contrast to the usual type-II heterojunction.
机译:以氯化锌和钛酸四丁酯为原料,通过常规煅烧处理,合成了以ZnO纳米颗粒为基的ZnO / TiO2异质结光催化剂。 ZnO / TiO2异质结光催化剂的材料性能已通过SEM / TEM,XRD,FTIR,XPS,BET分析,UV-Vis吸收和光致发光光谱进行了仔细表征。与材料结构相关,已系统地研究了在紫外光照射下若丹明B(RhB)分解的光催化性能。对于具有5%ZnO负载的最佳杂化光催化剂,已确定表观RhB降解速率常数(k)为20.7 x 10(-3)min(-1),明显高于纯TiO2(12.2 x 10( -3)min(-1))和纯ZnO纳米粒子(5.7 x 10(-3)min(-1))。活性物种捕获实验表明,中心点OH和中心点O2(-)在光催化反应中起主要作用。与通常的II型异质结相反,增强的性能可以归因于ZnO和TiO2之间直接Z方案异质结结构的形成。

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