Three-dimensional CNTs/TiO2 self-supporting hybrid fabrics constructed via atomic layer deposition for visible-light-enhanced catalytic activity

The contamination caused by synthetic dyes represents a global challenge that requires immediate and effective solutions. Photocatalysis provides an effective solution to this challenge, and carbon nanotubes (CNTs) represent a promising material for the development of advanced composite photocatalysts. However, the pronounced hydrophobic characteristics significantly hinder its applicability in water-based environments. In this research, the freestanding CNT substrates were modified via the deposition of titanium dioxide (TiO 2 ) using atomic layer deposition (ALD). The loadings of oxide in CNT fabrics were examined by controlling ALD deposition and subsequent calcination conditions. The morphological characteristics, crystalline structure, wettability, and photocatalytic performance of the deposited CNT fabrics were also systematically investigated in detail. The hydrophilicity of CNT fabrics is promoted via ALD of TiO 2 on one hand, and the functionalized fabrics exhibit excellent photocatalytic degradation performance on the other. Compared with pristine CNT fabric, the TiO 2 -CNT composite fabric exhibits excellent photocatalytic degradation performance and stable reusability. After calcination, the integration of CNTs with anatase TiO 2 significantly enhances electron transfer efficiency and markedly reduces the recombination probability occurring between photogenerated electrons and holes.