Synthesis of rare earth doped TiO2 nanorods as photocatalysts for lignin degradation

Song, Liang; Zhao, Xueyuan; Cao, Lixin; Moon, Ji-Won; Gu, Baohua; Wang, Wei

doi:10.1039/C5NR03537F

Title: Synthesis of rare earth doped TiO₂ nanorods as photocatalysts for lignin degradation

Journal Article · Thu Sep 10 00:00:00 EDT 2015 · Nanoscale

DOI:https://doi.org/10.1039/C5NR03537F· OSTI ID:1265522

Song, Liang ^[1]; Zhao, Xueyuan ^[2]; Cao, Lixin ^[3]; Moon, Ji-Won ^[4]; Gu, Baohua ^[4]; Wang, Wei ^[5]

Chinese Academy of Sciences (CAS), Qingdao (China). Qingdao Inst. of Bioenergy and Bioprocess Technology. Key Lab. of Biofuel; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences and Biosciences Divisions
Chinese Academy of Sciences (CAS), Qingdao (China). Qingdao Inst. of Bioenergy and Bioprocess Technology. Key Lab. of Biofuel
Ocean Univ. of China, Qingdao (China). Inst. of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences and Biosciences Divisions
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences and Biosciences Divisions; Ocean Univ. of China, Qingdao (China). Inst. of Materials Science and Engineering

In this paper, a two-step process is developed to synthesize rare earth doped titania nanorods (RE–TiO₂ NRs) as photocatalysts for efficient degradation of lignin under simulated sunlight irradiation. In this approach, protonated titanate nanotubes with layered structures were first prepared by a hydrothermal approach, and rare earth metal ions were subsequently bound to the negatively charged surface of the synthesized titanate via electrostatic incorporation. The as-synthesized RE–TiO₂ NRs after calcination generally showed much higher photocatalytic efficiencies than those of undoped TiO₂ NRs or the commercial P25 TiO₂ photocatalyst. Using methyl orange (MO) as a probing molecule, we demonstrate that Eu–TiO₂ NRs are among the best for degrading MO, with an observed rate constant of 4.2 × 10^-3 s^-1. The La³⁺, Sm³⁺, Eu³⁺ and Er³⁺ doped TiO₂ NRs also showed higher photocatalytic efficiencies in degrading MO than the commercial P25 TiO₂. Finally, we further demonstrate that lignin can be photodegraded effectively and rapidly at room temperature under simulated sunlight through two reaction routes, which could be important in controlling ways of lignin depolymerization or the formation of reaction products.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Chinese Academy of Sciences (CAS), Qingdao (China)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265522

Journal Information:: Nanoscale, Vol. 7, Issue 40; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 60 works

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Title: Synthesis of rare earth doped TiO₂ nanorods as photocatalysts for lignin degradation