Synthesis of TiO₂/CNT Composites and its Photocatalytic Activity Toward Sudan (I) Degradation

Abstract

Semiconductor photocatalysis has the potential for achieving sustainable energy generation and degrading organic contaminants. In TiO2 , the addition of carbonaceous nanomaterials has attracted extensive attention as a means to increase its photocatalytic activity. In this study, composites of TiO2 and carbon nanotubes (CNT) in various proportions were synthesized by the hydrothermal method. The crystalline structures, morphologies, and light absorption properties of the TiO2 /CNT photocatalysts were characterized by PXRD, TEM and UV-Vis absorption spectra. The photocatalytic efficiency of the composites was evaluated by the degradation of Sudan (I) in UV-Vis light. Introducing 0.1-0.5 wt% CNT was shown to substantially improve the photoactivity of TiO2 . The composite with 0.3 wt% CNT showed the best catalytic activity, and its reaction activation energy was calculated as 39.57 kJ mol(-1) from experimental rates. The degradation products of Sudan (I) with different irradiation durations were characterized by Fourier transform infrared spectroscopy, and a degradation reaction process was proposed.

Zr‐Metal Organic Framework and Derivatives for Adsorptive and Photocatalytic Removal of Acid Dyes

“…The removal efficiency was further enhanced to 3.5 mg/g as CNTs were introduced to UiO-66, showing that CNTs could greatly enhance the photodegradation. It has been reported that the combination of CNTs and photocatalysts (e.g., TiO 2 ) can facilitate the charge transfer and reduce the recombination of photogenerated electron/hole pairs (Jiang et al, 2013b;Miribangul et al, 2016;Woan et al, 2009;Xie et al, 2010). Such a mechanism might contribute to the enhancement of UiO-66-CNT for the photodegradation.…”

Advanced Design and Synthesis of Composite Photocatalysts for the Remediation of Wastewater: A Review

“…As a result, a variety of semiconductor-CNT composite photocatalysts have been developed. For example, Miribangul et al [83] prepared a TiO 2 /CNT composite via a simple hydrothermal method. The influence of the CNT concentration in the TiO 2 -CNT composites on their photocatalytic activity was investigated and the 0.3 wt % CNT content in TiO 2 /CNT composite could offer the highest photocatalytic degradation of Sudan (I) in UV-vis light.…”

Doping Transition Metals into TiO2‐CNT Nanocatalyst to Enhance the Selective Oxidation of H2S

“…and noble elements (Pt, Pd or Rh) heteroatoms into metallic or carbonaceous catalysts has been demonstrated as an effective and practical route in various application such as lithium batteries, gas sensors, photocatalysis and electrochromic devices and adsorption. [20][21][22][23][24][25][26][27][28][29][30] However, for any practical application, at first, the cost and stability of the material must be considered. The anion and noble metal dopants do not have much practicability because of their inadequate stability, intricate preparation process, and costly initial material.…”