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用于改善光催化水还原CO为CH的层状钙钛矿SrTiO的表面改性

Surface modification of layered perovskite SrTiO for improved CO photoreduction with HO to CH.

作者信息

Kwak Byeong Sub, Do Jeong Yeon, Park No-Kuk, Kang Misook

机构信息

Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea.

School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea.

出版信息

Sci Rep. 2017 Nov 27;7(1):16370. doi: 10.1038/s41598-017-16605-w.

DOI:10.1038/s41598-017-16605-w
PMID:29180791
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5704012/
Abstract

Layered perovskite SrTiO photocatalyst was synthesized by using sol-gel method with citric acid. In order to increase the surface area of layered perovskite SrTiO, and thus to improve its photocatalytic activity for CO reduction, its surface was modified via hydrogen treatment or exfoliation. The physical and chemical properties of the prepared catalysts were characterized by X-ray diffraction, high-resolution transmission electron microscopy, elemental mapping analysis, energy-dispersive X-ray spectroscopy, N adsorption-desorption, UV-Vis spectroscopy, X-ray photoelectron spectroscopy, photoluminescence, and electrophoretic light scattering. CO photoreduction was performed in a closed reactor under 6 W/cm UV irradiation. The gaseous products were analyzed using a gas chromatograph equipped with flame ionization and thermal conductivity detectors. The exfoliated SrTiO catalyst (E-SrTiO) exhibited a narrow band gap, a large surface area, and high dispersion. Owing to these advantageous properties, E-SrTiO photocatalyst showed an excellent catalytic performance for CO photoreduction reaction. The rate of CH production from the photoreduction of CO with HO using E-SrTiO was about 3431.77 μmol/g after 8 h.

摘要

采用溶胶 - 凝胶法并以柠檬酸为原料合成了层状钙钛矿型SrTiO光催化剂。为了增加层状钙钛矿型SrTiO的表面积，从而提高其对CO还原的光催化活性，通过氢气处理或剥离对其表面进行了改性。采用X射线衍射、高分辨率透射电子显微镜、元素映射分析、能量色散X射线光谱、N吸附 - 脱附、紫外 - 可见光谱、X射线光电子能谱、光致发光和电泳光散射等手段对所制备催化剂的物理和化学性质进行了表征。在封闭反应器中，于6 W/cm紫外光照射下进行CO光还原反应。使用配备火焰离子化和热导检测器的气相色谱仪对气态产物进行分析。剥离后的SrTiO催化剂（E - SrTiO）具有窄带隙、大表面积和高分散性。由于这些有利性质，E - SrTiO光催化剂在CO光还原反应中表现出优异的催化性能。使用E - SrTiO通过CO与H₂O光还原生成CH₄的速率在8小时后约为3431.77 μmol/g。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/b921f9b5740e/41598_2017_16605_Fig18_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/b921f9b5740e/41598_2017_16605_Fig18_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/f26adac20dab/41598_2017_16605_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/63374822cd10/41598_2017_16605_Fig2_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/9550b61c4d87/41598_2017_16605_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/bc93e67fd981/41598_2017_16605_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/71504f465198/41598_2017_16605_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/fc490def3aad/41598_2017_16605_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/1b630ad0cb0c/41598_2017_16605_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/dac288ec154c/41598_2017_16605_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/b310efefdfc7/41598_2017_16605_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/cc190c97ca03/41598_2017_16605_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/a80969e82b9c/41598_2017_16605_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/06298d6a40ae/41598_2017_16605_Fig14_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/42556218b9a5/41598_2017_16605_Fig15_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/a6928341a22f/41598_2017_16605_Fig16_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5646/5704012/b921f9b5740e/41598_2017_16605_Fig18_HTML.jpg

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