Photocatalytic NO removal over calcium-bridged siloxenes under ultraviolet and visible light irradiation

Haruo Imagawa, Xiaoyong Wu, Hiroshi Itahara, Shu Yin, Kazunobu Kojima, Shigefusa F. Chichibu, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Ca-Bridged siloxenes (Ca-siloxenes) composed of two-dimensional siloxene planes with Ca bridging were prepared and their photocatalytic properties for nitrogen oxide (NO) removal were investigated. Ca-Siloxenes were synthesized via a solid-state metathesis reaction using TaCl5 to extract Ca from CaSi2 with different Cl2/Ca molar ratios of 0.25, 1.25 and 2.5 (CS0.25, CS1.25 and CS2.5, respectively) in an attempt to control the extent of Ca extraction. Ca-Siloxenes have a wide optical absorption band from the visible to ultraviolet region with absorption edges of 1.5, 2.9, and 3.1 eV for CS0.25, CS1.25, and CS2.5, respectively. Ca-Siloxenes exhibited photocatalytic activity for NO removal under irradiation with visible (λ > 400 nm (<3.10 eV)) and ultraviolet light (λ > 290 nm (<4.28 eV)). The photocatalytic activity was particularly improved by mixing the Ca-siloxene with acetylene black as a conductive material, which might have inhibited the recombination of photogenerated electrons and holes. The mixture of Ca-siloxene and acetylene black exhibited improved photocatalytic activity in the presence of 1O2 as one of the active oxygen species formed under ultraviolet light irradiation.

Original languageEnglish
Pages (from-to)7070-7076
Number of pages7
JournalDalton Transactions
Issue number20
Publication statusPublished - 2018

ASJC Scopus subject areas

  • Inorganic Chemistry


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