Visible/solar light active photocatalysts for organic effluent treatment: Fundamentals, mechanisms and parametric review

Bora, Leena V.; Mewada, Rajubhai K.

doi:10.1016/j.rser.2017.01.130

Cited by 340 publications

(98 citation statements)

References 151 publications

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“…When the catalyst concentration went from 0.1 to 0.8 g/L, the degradation rate of BPA increased accordingly. The main reason is that as the concentration of the rGO-P25 photocatalyst increased, the active sites of adsorbed contaminants and the e − /h + pair increase accordingly [55]. When the catalyst concentration rose to 1.0 g/L, too much black composite photocatalyst had a shielding effect on light, blocking the progress of the photocatalytic reaction [43].…”

Section: Effect Of Catalyst Concentrationmentioning

confidence: 99%

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Bai

Yang

et al. 2019

Catalysts

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Reduced graphene oxide-titanium dioxide photocatalyst (rGO-TiO 2 ) was successfully synthesized by the hydrothermal method. The rGO-TiO 2 was used as photocatalyst for the degradation of bisphenol A (BPA), which is a typical endocrine disruptor of the environment. Characterization of photocatalysts and photocatalytic experiments under different conditions were performed for studying the structure and properties of photocatalysts. The characterization results showed that part of the anatase type TiO 2 was converted into rutile type TiO 2 after hydrothermal treatment and 1% rGO-P25 had the largest specific surface area (52.174 m 2 /g). Photocatalytic experiments indicated that 1% rGO-P25 had the best catalytic effect, and the most suitable concentration was 0.5 g/L. When the solution pH was 5.98, the catalyst was the most active. Under visible light, the three photocatalytic mechanisms were ranked as follows:1% rGO-P25 also had strong photocatalytic activity in the photocatalytic degradation of BPA under sunlight irradiation. 1% rGO-P25 with 0.5 g/L may be a very promising photocatalyst with a variety of light sources, especially under sunlight for practical applications.Catalysts 2019, 9, 607 2 of 15 out under normal temperature and pressure [10]; modern production cleaning process, where the energy source of this process is solar energy that cannot cause secondary pollution, and organic matter can be mineralized into clean energy such as H 2 O and CO 2 [11]; fast reaction rate, where organic pollutants can be destroyed completely within minutes to hours [12]. However, some drawbacks limit the practical application of TiO 2 . For instance, fast h + /e − recombination [13]; the large bandgap energy of 3.2 eV can only be excited by ultraviolet light (UV) with a wavelength less than 387 nm [3,6,[14][15][16][17]. In recent years, scientists have advanced many strategies in order to further improve the photocatalytic performance of TiO 2 , such as doping with non-metallic elements, combining with metal ions, depositing noble metals, and creating heterojunctions with other semiconductors [12,[18][19][20][21][22]. More recently, in contrast to other materials, graphene, graphene oxide (GO), and the graphene monolith formed by the stripping of GO, reduced graphene oxide (rGO) used in this experiment received wider attention because of its good mechanical strength, high electron mobility, chemical stability, optical properties, and high surface area [23][24][25][26][27]. Among them, rGO is a derivative of graphene and has a unique sp 2 hybrid carbon network [28]. The surface of the relatively inert graphene becomes extremely active due to the introduction of a large number of oxygen-containing functional groups such as hydroxyl group, epoxy group, carbonyl group, and a carboxyl group [29,30]. Therefore, the surface of graphene can also be connected to specific functions such as biomolecules, polymers, and inorganic particles [31]. The photocatalytic enhancement of rGO-TiO 2 composites can be attributed to three aspects: fi...

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Section: Effect Of Catalyst Concentrationmentioning

confidence: 99%

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Bai

Yang

et al. 2019

Catalysts

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“…Since the first report about the potential of photocatalytic technology in removal of organic pollutants from an aqueous system (Carey, Lawrence, & Tosine, ), photocatalytic technology has been investigated for more than forty years. Up to now, a large number of academic literatures were published with respect to photocatalysts (Ge, Zhang, Heo, & Park, ), reactors (Leblebici, Stefanidis, & Gerven, ), and mechanisms (Bora & Mewada, ), and these reported results confirmed most refractory organics may be decomposed by reactive oxygen species from photocatalytic process. However, the practical application of photocatalysis in water or wastewater treatment was very difficult to implement (Loeb et al, ).…”

Section: Introductionmentioning

confidence: 91%

Fabrication of a double‐helical photocatalytic module for disinfection and antibiotics degradation

Wang

Zhang

et al. 2019

Water Environment Research

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A double‐helical photocatalytic module was fabricated via an annealing process following an anodic oxidation procedure, and installed into a commercial UV sterilizer to structure continuous‐flow photocatalytic device. Benefiting from the superior mass transfer of double‐helical structure to common flat plate or corrugated plate, as well as the improved adhesion between Ti support and TiO2 layer, the photocatalytic device displayed potential in practical disinfection and degradation of organics. During photocatalytic disinfection process with 21 mJ/cm2 of UV dose, the concentration of Escherichia coli decreased from 1.71 × 107 CFU/L (typical for municipal wastewater) in influent to 2,720 CFU/L in effluent water, which met the wastewater discharged standard of China. Escherichia coli reactivation ratio for the photocatalytic device was only one‐tenth of that for UV sterilizer. Furthermore, taking phenol, bisphenol A, and four antibiotics as targets, the device was demonstrated to promote the degradation of photodegradable pollutants via photocatalysis. These results highlight a feasibility of photocatalytic technology as a supporting role in practical wastewater treatment. Practitioner points TiO2 nanotube array was embedded in the surface of double‐helical Ti support to avoid detachment. This double‐helical photocatalytic module was installed into a commercial UV sterilizer to structure a continuous‐flow device. The continuous‐flow device was effective in sterilizing bacteria and decomposing photodegradable organic pollutants in wastewater. Improving the performance of UV technology was proposed as a feasible approach for the practical application of photocatalysis.

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“…TiO2 and ZnO are the most widely used photocatalysts due to their nontoxicity, low cost, and good photocatalytic activity. Their major drawback is their high band gaps which makes them to be photocatalytically active only in the presence of ultraviolet light (Bora and Mewada, 2017). The latter constitutes about 5% of the solar spectrum (Casbeer et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of ZnFe2O4/α-Al2O3 for Photocatalytic Degradation of Methylene Blue Dye and Real Textile Effluent

Hamza

Umara

Hasan

2019

Aceh Int. J. Sci. Technol

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Present work was aimed at the development of α-Al2O3 supported ZnFe2O4 visible-light responsive photocatalysts. ZnFe2O4 and α-Al2O3 supported ZnFe2O4 were synthesized using coprecipitation method followed by calcination at 500 °C. The synthesized photocatalysts were characterized using x-ray diffraction (XRD) and scanning electron microscopy (SEM). The synthesized ZnFe2O4 has low crystallinity. The particle size of ZnFe2O4 is much smaller than that of the α-Al2O3 support, and ZnFe2O4 particles are dispersed on the surface of the crystalline α-Al2O3 support. 30 wt % ZnFe2O4/α-Al2O3 exhibited the highest photocatalytic activity for degradation of methylene blue dye than ZnFe2O4 and other α-Al2O3 supported photocatalysts containing 10 wt %, 20 wt % and 40 wt % ZnFe2O4. Kinetics of photocatalytic degradation of methylene blue dye using 30 wt % ZnFe2O4/Al2O3 obeys Langmuir-Hinshelwood kinetic model. Photocatalytic treatment of real textile wastewater resulted in more effective (when compared to photolytic treatment) in the reduction of wastewater's chemical oxygen demand (COD), pH, conductivity and total dissolved solids (TDS). 30 wt% ZnFe2O4/Al2O3 was found to be more effective than unsupported ZnFe2O4 for the reduction of wastewater's COD, pH, conductivity and TDS.

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Visible/solar light active photocatalysts for organic effluent treatment: Fundamentals, mechanisms and parametric review

Cited by 340 publications

References 151 publications

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Fabrication of a double‐helical photocatalytic module for disinfection and antibiotics degradation

Preparation and Application of ZnFe2O4/α-Al2O3 for Photocatalytic Degradation of Methylene Blue Dye and Real Textile Effluent

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