Cu<sub class="a-plus-plus">2sub>O nanoparticle-functionalized cellulose-based aerogel as high-performance visible-light photocatalyst

详细信息    查看全文

• 作者：Xiuping Su ; Qian Liao ; Lin Liu ; Ranju Meng ; Zhouqi Qian ; Huiying Gao…
• 关键词：Cellulose matrix ; Cuprous oxide nanoparticles ; In situ ; Visible ; light catalysis ; Wastewater treatment
• 刊名：Cellulose
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：24
• 期：2
• 页码：1017-1029
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Bioorganic Chemistry; Physical Chemistry; Organic Chemistry; Polymer Sciences;
• 出版者：Springer Netherlands
• ISSN：1572-882X
• 卷排序：24

文摘

Cu<sub>2sub>O nanoparticle (NP)-functionalized cellulose-based aerogel (Cu<sub>2sub>O/CBA) with three-dimensional (3D) macroporous structure and abundant active sites was successfully prepared for visible-light photocatalysis via in situ deposition of Cu<sub>2sub>O NPs on cellulose-based aerogel (CBA). Octahedral Cu<sub>2sub>O NPs were formed and anchored onto the surface and inner wall of the cellulose matrix, which acted as a microreactor to prevent aggregation and protect the catalytic character of the Cu<sub>2sub>O NPs. The photocatalytic performance of the Cu<sub>2sub>O/CBA composite catalysts was evaluated using degradation of methylene blue (MB) as model pollutant. The effects of catalyst dosage, initial MB concentration, and solution pH on MB photodegradation were investigated. Use of 3D macroporous CBA improved the MB adsorption capacity and extended the absorption of visible-light irradiation. In particular, in situ deposition of Cu<sub>2sub>O in the cellulose matrix enhanced separation of photogenerated electrons and holes via surface-adsorbed molecular oxygen, and consequently the catalytic activity. The photodegradation rate of MB by Cu<sub>2sub>O/CBA composite catalyst reached 95.79%, much higher than the value of 73.59% for pure Cu<sub>2sub>O. The photodegradation process on the Cu<sub>2sub>O/CBA composite catalysts followed an apparent pseudo-first-order kinetic model. The Cu<sub>2sub>O/CBA composite catalyst was easily recycled and reused, with 80% MB degradation rate retained even after six cycles of irradiation for 30 min each. Such Cu<sub>2sub>O/CBA composite catalysts can be applied for wastewater treatment utilizing solar radiation.