Effects of Ni Doping and Silica Gel Bead Support on Characteristics of TiO2 Catalyst
Effects of Ni Doping and Silica Gel Bead Support on Characteristics of TiO2 Catalyst
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DOI：
10.1007/s11664-022-09867-2
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发表时间：
2022-08-24
影响因子：
2.1
通讯作者：
Van Quoc Duong，Van Quoc
中科院分区：
文献类型：
--
作者：
Nghia Manh Nguyen，Nguyen;Hue Thi Nguyen，Huệ;Van Quoc Duong，Van Quoc
二氧化钛(TiO2光催化剂)是一种可用于降解有机污染物的优良溶液。本文研究了用溶胶-凝胶法将镍掺杂二氧化钛固定在硅胶小球上。通过扫描电子显微镜、高分辨电子显微镜、X射线衍射仪、氮气等温环、拉曼光谱和紫外-可见吸收光谱等手段对样品的形貌、晶相组成、颗粒大小、孔隙率特性和光学性能进行了研究。结果表明，Ni2+均匀分布在TiO2晶格中，取代Ti4+，Ni2+不改变TiO2锐钛矿晶相。与纯二氧化钛相比，镍掺杂的二氧化钛样品的吸收边从400 nm红移到655 nm。受硅胶小球催化剂载体的影响，镍掺杂的二氧化钛样品的晶粒度从27 nm减小到6 nm，导致了拉曼光谱和紫外可见光谱的蓝移。甲基橙的光催化降解显示了光催化的增强作用。在紫外光照射下，硅胶小球负载的镍掺杂二氧化钛的光催化性能低于纯样品。相反，负载在硅胶微珠上的镍掺杂二氧化钛在可见光下表现出光催化增强作用。
Titanium dioxide (TiO2) photocatalyst is an excellent solution that can be utilized to decompose organic pollutants. In this report, Ni-doped TiO2immobilized on silica gel bead by sol–gel process was investigated. The morphology, crystal phase composition, particle size, porosity characteristics, and optical properties of the samples were investigated through scanning electron microscopy, high-resolution transmission electron microscopy, x-ray diffraction, N2isothermal loops, Raman spectroscopy, and ultraviolet–visible (UV–Vis) absorption. The results revealed that Ni2+uniformly distributed in the TiO2crystal lattice to replace Ti4+and that Ni2+did not change the TiO2anatase crystal phase. Compared with pure TiO2, the absorption edge of the Ni-doped TiO2sample exhibited a redshift from 400 nm to 655 nm. Influenced by silica gel bead as catalyst support, the crystal size of Ni-doped TiO2sample was reduced from 27 nm to 6 nm that led to a blueshift in both Raman and UV–Vis spectra. The photocatalytic enhancement was demonstrated by methyl orange decomposition. Under ultraviolet irradiation, the photocatalytic performance of Ni-doped TiO2immobilized on silica gel bead was lower compared with pure sample. Opposite to this, Ni-doped TiO2immobilized on silica gel bead showed photocatalytic enhancement under visible light.Graphical Abstract