Nannuri, Shivanand H and George, Sajan D (2021) Enhanced Visible/NIR driven catalytic activity in presence of neodymium (Nd3+), for Yb3+ and Tm3+ doped NaYF4 nanoparticles. Journal of Environmental Chemical Engineering, 9. pp. 1-12. ISSN 2213-3437
![]() |
PDF
13405.pdf - Published Version Restricted to Registered users only Download (9MB) | Request a copy |
Abstract
Removal of organic dye-based impurities from water has been achieved traditionally by the use of photocatalysts.ZnO is a commonly used photocatalyst that works when irradiated by UV irradiation. Since the UV fraction in a solar spectrum is very small, there is a scope of utilizing the near-infrared and visible spectrum for the process of dye degradation. We synthesized a novel tri-dopant upconversion nanoparticle (NaYF4:Yb,Tm,Nd) system using a simplified microwave-assisted technique and combined it with ZnO particles for methylene blue dye degradation studies. We examined the role of neodymium (Nd3+) dopant on the efficiency of dye degradation when illuminated under an inexpensive tungsten halogen lamp source. X-ray diffraction studies revealed that the presence of Nd3+ in the crystal lattice leads to a reduction in the particle size due to shrinkage in the crystallite size. The presence of Nd3+ in upconversion nanoparticles revealed several characteristic absorption bands from 520 nm to 870 nm along with the characteristic 980 nm corresponding to (ytterbium) Yb3+. The power-dependent study at 980 nm confirmed the multi-photon process of upconversion. The degradation efficiency revealed up to 92% degradation for 5 mg L− 1 of dye. The degradation efficiency of upconversion nanoparticles and ZnO system in the presence of Nd3+ was 72% and in the absence of Nd3+ was 58%, for a dye concentration of 10 mg L− 1. The dye degradation rate constant was higher for NaYF4:Yb,Tm,Nd and ZnO system (0.0041 min− 1) compared to NaYF4:Yb,Tm, and ZnO set (0.0029 min− 1). Thus, the presence of Nd3+ widens the absorption spectra of UCNP in both the visible and near-infrared (NIR) range
Item Type: | Article |
---|---|
Uncontrolled Keywords: | Upconversion nanoparticles; Doping, energy transfer; Photocatalysis; Zinc Oxide; Wastewater treatment; Visible light photocatalyst |
Subjects: | Departments at MU > Atomic Molecular Physics |
Depositing User: | KMC Library |
Date Deposited: | 25 Nov 2021 08:48 |
Last Modified: | 25 Nov 2021 08:48 |
URI: | http://eprints.manipal.edu/id/eprint/157754 |
Actions (login required)
![]() |
View Item |