Zeolite Na-A supported TiO2: Effects of TiO2 loading on structural, optical and adsorption properties

被引：13

作者：

Munguti, Lawrence Kioko ^{[1
,2
]}

Dejene, Francis Birhanu ^{[3
]}

Muthee, Dorah Kawira ^{[4
]}

机构：

[1] Univ Free State QwaQwa Campus, Dept Phys, Private Bag X13, ZA-9866 Phuthaditjhaba, South Africa

[2] South Eastern Kenya Univ, Dept Phys Sci, POB 90200, Kitui, Kenya

[3] Walter Sisulu Univ, Dept Chem & Phys Sci, Private Bag X1, ZA-5117 Mthatha, South Africa

[4] Machakos Univ, Dept Phys Sci, POB 136-90100, Machakos, Kenya

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2023年 / 289卷

关键词：

Zeolites; Photodegradation; Agglomerations; Nanocomposites; TiO2; ENHANCED PHOTOCATALYTIC ACTIVITY; NATURAL ZEOLITE; METHYLENE-BLUE; DOPED TIO2; DEGRADATION; CLINOPTILOLITE; DYE; NANOPARTICLES; AGGLOMERATION; AGGREGATION;

D O I：

10.1016/j.mseb.2023.116281

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Zeolite Na-A supported TiO2 nanopowders were synthesized via a modified sol-gel technique and the effects of TiO2 loading were characterized for thermal, structural, morphological, optical and textural behaviour. Thermal properties predicted a minimum annealing temperature of 600 degrees C whereas the X-ray diffraction (XRD) patterns indicated that the composite was highly crystalline, and consisted of both TiO2 and zeolite Na-A peaks. Scanning electron microscopy (SEM) images confirmed that the TiO2 nanoparticles occurred mainly on the surface of the zeolite Na-A support. Nitrogen adsorption-desorption studies portrayed increased porosity and larger surface area for TiO2/zeolite Na-A compared to pure TiO2. The optical band gap decreased with increased TiO2 loading from 3.17 to 2.85 eV. The synthesized nanopowders were applied in photocatalytic dye removal, where by the highest degradation rate for the supported TiO2 was realized at 1.5 %TiO2/zeolite Na-A loading. It was found that loading beyond 1.5 %TiO2 led to a structural collapse and decline in the photodegradation rate.

引用

页数：12

共 41 条

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