文献类型：期刊文献

英文题名：Polydopamine-assisted immobilization of metallic nanoparticles confined regionally in bamboo microchannels as continuous-flow microreactors for enhanced catalysis

作者：Yao, Sisi[1,2] Guo, Dengkang[2] Han, Shenjie[3] Fu, Zongying[1] Lyu, Shaoyi[1] Li, Jingpeng[2] Lu, Yun[1]

第一作者：Yao, Sisi

通信作者：Lu, Y[1];Li, JP[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]China Natl Bamboo Res Ctr, Key Lab High Efficient Proc Bamboo Zhejiang Prov, Hangzhou 310012, Peoples R China;[3]Yancheng Inst Technol, Key Lab Adv Technol Environm Protect Jiangsu Prov, Yancheng 224051, Peoples R China

年份：2024

卷号：492

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20242116116911);Scopus(收录号：2-s2.0-85193434428);WOS:【SCI-EXPANDED(收录号:WOS:001265251000001)】；

基金：This work was financially supported by the Fundamental Research Funds for the Central Non -Profit Research Institution of CAF (Grant Nos. CAFYBB2022XD004-02, CAFYBB2022QA006) , the National Natural Science Foundation of China (Grant Nos. 32101604, 32122058) , and the Project of Forestry Science and Technology of the Zhejiang Province (2021SY13) . The authors would like to express their gratitude to Prof. Zheng from Zhejiang University for providing support in conducting SEM and EDS analysis, as well as to Engineer Duan from Shiyanjia Lab ( www.shiyanjia.com ) for assisting with the XPS analysis.

语种：英文

外文关键词：Bamboo microreactor; Polydopamine; Metallic nanocatalysis; Regioselectivity; Continuous flow

摘要：In contrast to conventional plant-based microreactors where the nanocatalyst is anchored on the inner walls of microchannel structures, this study presents a bamboo-based flow microreactor in which the metallic nanocatalyst is immobilized within polydopamine (PDA) region-modified bamboo microchannels. This novel design facilitates a large surface area for nanocatalyst loading, enhances mass transfer, and reduces nanocatalyst leaching. Firstly, the hierarchical PDA architecture was fabricated on the wall surface of required bamboo microchannels through an ammoniation-induced self-assembly process to serve as a nanocatalyst support layer. The thickness of PDA architectures was modulated by adjusting the flow duration. Secondly, the metallic nanoparticles (NPs), including Pd, Au, and Ag, were effectively immobilized within the hierarchical PDA architectures as highly efficient catalysts using a flow-assisted method with minimal chemical usage and low catalyst loading (Pd content: 0.011 wt%). The catalytic performances of the proposed Pd-PDA/bamboo microreactor were evaluated for the continuous hydrogenation of nitroaromatics under flow conditions, encompassing variations in Pd content, nitroaromatic concentration, and liquid flow rate. The optimized Pd-PDA/bamboo microreactor exhibited high average conversion (>97 %) of nitroaromatics during 20 days of continuous operation without any noticeable deactivation or loss in activity due to its excellent stability resulting from firm immobilization of active metallic NPs within hierarchical PDA architectures. Additionally, this bamboo microreactor demonstrated potential applicability in environmental pollution treatment through azo dye hydrogenation.