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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5]
  1. 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
  2. Chinese Academy of Sciences (CAS), Qingdao (China). Qingdao Inst. of Bioenergy and Bioprocess Technology. Key Lab. of Biofuel
  3. Ocean Univ. of China, Qingdao (China). Inst. of Materials Science and Engineering
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences and Biosciences Divisions
  5. 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
Publication Date:
OSTI Identifier:
1265522
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 7; Journal Issue: 40; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Chinese Academy of Sciences (CAS), Qingdao (China)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE lignin; TiO2; rare earth; catalyst; photodegradation