Facile preparation of carbon quantum dots/TiO2 composites at room temperature with improved visible-light photocatalytic activity

We present a facile and energy-efficient impregnation method for the preparation of effective Carbon quantum dots /TiO2 composite photocatalysts at room temperature employing coal tar pitch as “natural CQDs”

Jingjie Zhang; Quanrun Liu; Junhao Wang; He He; Feng Shi; Baolin Xing; Jianbo Jia; Guangxu Huang; Chuanxiang Zhang

2021

Scholarcy highlights

  • Carbon quantum dots have demonstrated tremendous potential in enhancing the photocatalytic performance of TiO2; the fabrication of CQDs/TiO2 composite photocatalysts typically involves harsh reagents/conditions, cumbersome purification procedures and external energy supplies
  • We present a facile and energy-efficient impregnation method for the preparation of effective CQDs/TiO2 composite photocatalysts at room temperature employing coal tar pitch as “natural CQDs”
  • The characterization results indicate that TiO2 and CQDs can be successfully coupled together by forming Ti‒O‒C bonds
  • The fabricated CQDs/TiO2 composites show remarkably improved photodegradation performances of rhodamine B under visible-light irradiation, which are far higher than pure TiO2
  • The marked ameliorated photocatalytic performance is attributed to the fact that the successful coupling between TiO2 and CQDs can ameliorate the absorption ability of visible light, accelerate the separation/transfer of charge carriers and restrain the recombination of photogenerated electron–hole pairs
  • This research provides a facile method for large-scale preparation of CQDs modified semiconductor photocatalysts that can potentially be used in environmental and energy applications

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