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Chemistry and Industry of Forest Products ›› 2024, Vol. 44 ›› Issue (2): 20-26.doi: 10.3969/j.issn.0253-2417.2024.02.003

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Preparation of Nano-flower-shaped Carbon Loaded Ag-ZnO Using Lignin Template Method and Its Photocatalytic CO2 Conversion

Bihui AN, Haojie CHEN, Lili ZHANG(), Jinxia MA, Zhiguo WANG   

  1. College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2023-03-15 Online:2024-04-28 Published:2024-04-23
  • Contact: Lili ZHANG E-mail:zhangll@njfu.edu.cn

Abstract:

Using lignin(AL) as a template, nanoscale lignin-loaded zinc oxide(ZnO/AL) composite materials were prepared. Silver nanoparticles(AgNPs) were loaded onto this base material, and a nano-flower-shaped carbon loaded silver-zinc oxide(Ag-ZnO/C) composite material was prepared through high-temperature calcination. The composite materials were characterized using scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS), and their ability for photocatalytic conversion of CO2 was evaluated. The research results showed that when using lignin as a template, ZnO/AL could maintain the nano-flower morphology and structure during the subsequent calcination processes, and lignin could reduce silver ions in situ to AgNPs, uniformly loading them on the ZnO petal layers. Energy-dispersive X-ray spectroscopy(EDX) results showed that Ag-ZnO/C composite material was mainly composed of C(14.7%), O(14.4%), Zn(34.1%) and Ag(18.0%) elements. Combined with TEM, XRD, and XPS analysis, the successful preparation of the Ag-ZnO/C composite material was confirmed. The ability of photocatalytic CO2 conversion of the composite materials with different Ag+/Zn2+ ratios of 1∶2(Ag0.1-ZnO0.2/C) and 1∶10(Ag0.1-ZnO1.0/C) was compared. Photocurrent response and impedance spectroscopy test results indicated that Ag0.1-ZnO1.0/C had higher photocurrent intensity, lower resistance, and superior photocatalytic activity. The photocatalytic CO2 conversion by Ag0.1-ZnO1.0/C showed consistently low CH4 production, and the CO yield could reach 114.9 μmol/g after 10 hours of reaction.

Key words: lignin, Ag-ZnO nanoflower, CO2 conversion

CLC Number: