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<strong>Preparation of a CeO2/γ-Al2O3 composite and its catalytic degradation performance</strong>

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Title Statement <strong>Preparation of a CeO2/γ-Al2O3 composite and its catalytic degradation performance</strong>
 
Added Entry - Uncontrolled Name Li, youfeng
Lin, Jinliang
Wang, Guangwei
Liu, Guoqing
This project was financially supported by the National Natural Science Foundation of China（No:41763008）, National Science Foundation of Hunan Province (No.2018JJ2112), Natural Science Foundation of Guizhou Province ([2017]1198), and projects of “Chemical
 
Uncontrolled Index Term Composite catalyst; CeO2/γ-Al2O3; Methylene blue; Catalytic degradation; Wastewater treatment
 
Summary, etc. CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> composite catalyst has been prepared using CeO<sub>2</sub> as an active component and γ-Al<sub>2</sub>O<sub>3</sub> as a support to remove dye from wastewater by catalytic degradation. The catalytic performance of the CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> sample for the degradation of methylene blue is studied under visible light irradiation. The results show the presence of <em>γ</em>-Al<sub>2</sub>O<sub>3</sub> and CeO<sub>2</sub> with a cubic fluorite structure in the CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> samples synthesized at 550°C. Small CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> particle and a good dispersion of CeO<sub>2</sub> are achieved with loading of CeO<sub>2</sub>. The loading of CeO<sub>2</sub> on γ-Al<sub>2</sub>O<sub>3</sub> also increases the total pore volume and pore diameter, which results in a high specific surface area of 132.03 m<sup>2</sup>/g, a total pore volume of 0.74 cm<sup>3</sup>/g, and a mean pore diameter of 22.54 nm. The photocatalytic degradation efficiency of methylene blue by the CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst is higher than those of CeO<sub>2</sub> and γ-Al<sub>2</sub>O<sub>3</sub>. Under the same conditions the CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst achieves 98.36% degradation at 80 min, higher 5.0% and 11.9% degradation than CeO<sub>2 </sub>and γ-Al<sub>2</sub>O<sub>3</sub>, respectively. The high efficiency is attributed to promotion of the structural and textural performance of the CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst by synergistic interaction between CeO<sub>2</sub> and γ-Al<sub>2</sub>O<sub>3</sub>. These performances promote a larger surface area, higher content of acid sites, more •OH radicals and higher redox properties of the catalyst. The catalytic reaction kinetics could be fitted by the heterogeneous Langmuir-Hinshelwood model and the pseudo-first order rated constant for <em>k<sub>app</sub></em> is 17.5×10<sup>−2</sup>, which is 1.33 and 2.5 times as big as those of CeO<sub>2</sub> and γ-Al<sub>2</sub>O<sub>3</sub>, respectively. CeO<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst suggests promising application for practical dye pollutant treatment.
 
Publication, Distribution, Etc. Indian Journal of Chemical Technology (IJCT)
2020-10-20 14:50:16
 
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http://op.niscair.res.in/index.php/IJCT/article/view/24422
 
Data Source Entry Indian Journal of Chemical Technology (IJCT); ##issue.vol## 27, ##issue.no## 3 (2020): Indian Journal of Chemical Technology
 
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Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCT/article/download/24422/465476379