Abstract
This paper aims to review and summarize the recent works on the photocatalytic degradation of various organic pollutants in the presence of nano-doped-TiO2 photocatalysts. In this regard, three main aspects are examined: (a) the presence of various dopants (metal dopants, nonmetal dopants, halogen dopants, metalloid dopants, and codopants) in the formation of nano-doped-TiO2 photocatalysts, (b) the effect of the presence of dopants on the photocatalytic degradation of organic pollutants, and (c) the effects of various operating parameters on the photocatalytic degradation of organic pollutants in the presence of nano-doped-TiO2 photocatalysts. Reports resulted suggest that the formation of a high percentage of the anatase phase, small crystallite size, and high specific surface area of the nano-doped-TiO2 photocatalysts depends on the presence of various dopants in the photocatalysts. The majority of the dopants have the potential to improve the photocatalytic efficiency of nano-doped-TiO2 in the degradation of organic pollutants. The photocatalytic degradation of organic compounds depends on the calcination temperature of the prepared doped TiO2, initial reactant concentration, dosage of doped TiO2, and dopant doping concentration.
Highlights
Water reuse has emerged as a critical issue in preserving global water resources in recent times
Even though a complete understanding has yet to be achieved, it is generally accepted that titanium dioxide precursors affect the morphology of nano-TiO2 in aspects such as specific surface area, crystallinity phase, and crystallite size that play an important role in the photocatalytic degradation of organic pollutants [9]
It is clear from the literature that small crystallite size, high percentage of the anatase phase, and high specific surface area of nano-doped-TiO2 increase the photocatalytic degradation efficiency
Summary
Water reuse has emerged as a critical issue in preserving global water resources in recent times. The world faces enormous challenges ahead as drinkable water runs short due to natural disasters, population increase, and water pollution To address these problems, advanced oxidation processes (AOPs) play an important role in the wastewater treatment. Even though a complete understanding has yet to be achieved, it is generally accepted that titanium dioxide precursors affect the morphology of nano-TiO2 in aspects such as specific surface area, crystallinity phase, and crystallite size that play an important role in the photocatalytic degradation of organic pollutants [9]. It is clear from the literature that small crystallite size, high percentage of the anatase phase, and high specific surface area of nano-doped-TiO2 increase the photocatalytic degradation efficiency. The effects of various operating parameters on the photocatalytic degradation of organic pollutants in the presence of nano-doped-TiO2 photocatalysts are appraised
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