Preparation and Application of Immobilized Surfactant-Modified PANi-CNT/TiO2 under Visible-Light Irradiation

Abstract

Hydrothermally and sol-gel-synthesized immobilized surfactant-modified polyaniline-carbon nanotubes/TiO2 (PANi-CNT/TiO2) photocatalysts were prepared and their application in the degradation of diethyl phthalate (DEP) under visible light at 410 nm was investigated in this sturdy. To improve the dispersion of nanoparticles and the transfer of electrons, the TiO2 surface was modified with both sodium dodecyl sulfate (SDS) and functionalized carbon nanotubes (CNT-COOH and CNT-COCl). With the addition of PANi, which was increased from 1–5%, the adsorption edge of the prepared photocatalysts shifted to 442 nm. The SDS linked the PANi polymers to achieve a thickness of coating of the film of up to 314–400 nm and 1301–1600 nm for sol-gel hydrolysis and hydrothermally-synthesized photocatalysts, respectively. An appropriate film thickness would extend the transfer path of the electrons and inhibit the recombination of the electrons and the electron-holes. The photo-degradation performance of DEP by the hydrothermally-synthesized photocatalysts was better than those by sol-gel hydrolysis. The results revealed that the hydroxyl radicals were the key oxidant in the degradation of DEP using hydrothermally-synthesized PANi-CNT/TiO2 photocatalysts. The morphology and functional groups of the raw materials of photocatalysts were characterized and a comparison of photocatalytic activity with other TiO2-based photocatalysts was also provided.

Enhancement of CO2 Desorption from a Novel Absorbent (Dimethyl Carbonate) by Using a PDMS/TiO2 Pervaporation Membrane

“…The strong absorption band at 1259 cm –1 is attributed to the vibration mode of – Si–C stretching. The functional groups of Ti–OH were found at 1598 cm –1 . Absorption bands at 2966 cm –1 are attributed to the vibration mode of C–H stretching.…”

Reusable floating polymer nanocomposite photocatalyst for the efficient treatment of dye wastewaters under scaled‐up conditions in batch and recirculation modes

“…47 This mixture was homogenised in a sonication water bath for 1 h followed by heating and stirring Table 1. Summary of literature regarding polymer supported immobilised photocatalysts 1,4,5,13,20,[35][36][37][38] Number for 2 h at 120 ∘ C after which the resulting solution thickens. This solution was cast in a glass tray of 28 cm × 33 cm and kept in the fume hood for solvent evaporation for 24 h. The resulting film was washed multiple times with distilled water to remove any surface impurities and then dried in a standard laboratory oven for 24 h at 50 ∘ C. The same procedure was used to prepare polymer films with different catalyst loadings from 2 to 16 wt%.…”

Toxicity of ZnO/TiO2‐conjugated carbon‐based nanohybrids on the coastal marine alga Thalassiosira pseudonana

“…However, as revealed in Figure B, no distinct peaks were found in the CNT spectrum at 500 to 4000 cm −1 . There were several peaks (OH, CH, CO, CC, and CO) from the spectrum of ZnO‐CNT to TiO 2 ‐CNT, with the peaks at 1300 cm −1 (TiOH) and 550 cm −1 (TiOTi) …”