Abstract
Organic contaminants (textile dyes, pesticides) in industrial wastewater have adverse effects on the environment and human health. Such environmental pollutants are resistant in the environment and are difficult to completely remove through treatment techniques. Therefore, titanium dioxide (TiO2) nanostructure-based photocatalytic processes have received much attention due to their environmentally green nature with high efficiency for complete photodegradation of organic pollutants to produce safe and clean water.
In this chapter, zero-dimensional to three-dimensional TiO2 nanostructures functionalized with various polymeric and nanocarbon hybrid materials are discussed as low-cost, nontoxic, and highly efficient photocatalytic materials for photodegradation of chemical pollutants, in comparison with pristine TiO2, through expansion of the visible light photoresponse and regulation of the bandgap properties of TiO2. Various chemical synthesis methods, surface modifications with various polymers and nanostructured carbons, compositions, morphological structures, growth mechanisms, physicochemical properties, electronic and optical characteristics, and photocatalytic mechanisms (e.g., reactive oxygen species generation) of various heterostructured TiO2-based photocatalysts are discussed in terms of their prospects and future challenges in the fields of photocatalytic environmental remediation and hydrogen generation.
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Abbreviations
- λ:
-
Wavelength (nm)
- λmax :
-
Specific wavelength maximum (nm)
- 1D:
-
One-dimensional
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- 2-CP:
-
2-Chlorophenol
- A:
-
Absorbance
- AC:
-
Activated carbon
- ALD:
-
Atomic layer deposition
- APS:
-
Ammonium persulfate
- B:
-
Path length of sample (m)
- BPA:
-
Bisphenol A
- C:
-
Concentration (mol/m3)
- C0 :
-
Initial concentration (mol/m3)
- CB:
-
Conduction band
- CEPDA:
-
Electrophoretic deposition–anodization
- CFL:
-
Compact fluorescent lamp
- CNT:
-
Carbon nanotube
- COD:
-
Chemical oxygen demand
- CVD:
-
Chemical vapor deposition
- DSC:
-
Digital scanning calorimeter
- Ε:
-
Molar absorptivity (m2/mol)
- e− :
-
Electron
- Eg :
-
Bandgap energy
- FE-SEM:
-
Field emission scanning electron microscopy
- FTIR:
-
Fourier transform infrared
- G:
-
Graphene
- GO:
-
Graphene oxide
- Η:
-
Degree of photocatalytic degradation
- h+ :
-
Hole
- HOMO:
-
Highest occupied molecular orbital
- hv:
-
Photon energy
- K:
-
Rate constant (min−1)
- LED:
-
Light-emitting diode
- LUMO:
-
Lowest unoccupied molecular orbital
- MB:
-
Methylene blue
- MO:
-
Methyl orange
- MWCNT:
-
Multiwalled carbon nanotube
- P(3HB-co-3HHx):
-
Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)
- PAA:
-
Poly(acrylic acid)
- PANI:
-
Polyaniline
- PC:
-
Polycarbonate
- PE:
-
Polythene
- PET:
-
Poly(ethylene terephthalate)
- PMMA:
-
Poly(methyl methacrylate)
- PP:
-
Polypropylene
- PPF:
-
Polypropylene fabric
- PPy:
-
Polypyrrole
- PS:
-
Polystyrene
- PSP4VP:
-
Poly(styrene)-co-poly(4-vinylpyridine)
- PTh:
-
Polythiophene
- PVA:
-
Poly(vinyl alcohol)
- PVAc:
-
Polyvinyl acetate
- PVC:
-
Polyvinyl chloride
- PVDF:
-
Poly(vinylidene difluoride)
- R:
-
Relative concentration
- rGO:
-
Reduced graphene oxide
- RhB:
-
Rhodamine B
- SC:
-
Semiconductor
- SDS:
-
Sodium dodecyl sulfate
- SWCNT:
-
Single-walled carbon nanotube
- T:
-
Time (min)
- T:
-
Transmittance
- Tc:
-
Crystallization temperature (K)
- TCP:
-
Transformer-coupled plasma
- TEM:
-
Transmission electron microscopy
- Tg:
-
Glass transition temperature (°C)
- TGA:
-
Thermogravimetric analyzer
- UV:
-
Ultraviolet
- UV-Vis:
-
Ultraviolet–visible
- VB:
-
Valence band
- XRD:
-
X-ray diffraction
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Reddy, K.R., Jyothi, M.S., Raghu, A.V., Sadhu, V., Naveen, S., Aminabhavi, T.M. (2020). Nanocarbons-Supported and Polymers-Supported Titanium Dioxide Nanostructures as Efficient Photocatalysts for Remediation of Contaminated Wastewater and Hydrogen Production. In: Inamuddin, Asiri, A., Lichtfouse, E. (eds) Nanophotocatalysis and Environmental Applications . Environmental Chemistry for a Sustainable World, vol 30. Springer, Cham. https://doi.org/10.1007/978-3-030-12619-3_6
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