Photocatalytic degradation of pollutants in petroleum refinery wastewater by TiO2- and ZnO-based photocatalysts: Recent development

Ani, I.J.; Akpan, U.G.; Olutoye, M.A.; Hameed, B.H.

doi:10.1016/j.jclepro.2018.08.189

Cited by 331 publications

(101 citation statements)

References 144 publications

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“…Transition metal oxide nanoparticles like ZnO, TiO 2 , CeO 2 , SnO 2 , CuO-SnO 2 , Cu-TiO 2 are used as catalyst for photo degradation due to their ability of generating charge carriers when irradiated with UV/solar radiations [10][11][12][13]. Very few researchers have reported the degradation of titan yellow by photo catalysis using green synthesized ZnO.…”

Section: Introductionmentioning

confidence: 99%

“…Photogenerated holes in ZnO have strong oxidizing power to decompose most organic compounds. ZnO has often been considered as a valid alternative to TiO 2 because of its good optoelectronic, catalytic and photochemical properties combined with economic viability [10]. ZnO has a band gap of 3.0 eV that is lower than that of anatase TiO 2 , has been tested to decompose aqueous solutions of several dyes and many other environmental pollutants [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Photo-assisted mineralisation of titan yellow dye using ZnO nanorods synthesised via environmental benign route

Vidya¹,

Manjunatha

Sudeep³

et al. 2020

SN Appl. Sci.

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Green synthesis of metal oxide nanoparticles using plant extract is a most promising substitute for regular methods that involve chemical synthesis approach. The present study reports the synthesis of ZnO nano rods (ZNRs) using Calotropis gigantea, a plant rich in flavonoids and alkaloids and their application as a photocatalyst in the degradation of titan yellow dye. The synthesized ZNRs were characterized using XRD, FESEM-EDS and HRTEM-SAED. The XRD results confirm the formation of wurtzite ZnO. The FESEM images confirmed that ZNRs have length ranging from 20 to 200 nm, diameter ranging between 20 and 80 nm and width between 20 and 50 nm. The bio-synthesized ZNRs were used for photo-degradation of titan yellow dye, one of the main effluents from textile industries, discharged directly into water bodies. The ZNRs exhibited 95% dye degradation for 10 ppm TY dye concentration in the presence of 60 mg of the ZNRs catalyst at pH 8 for 60 min UV irradiation. The present study reports eco-friendly method for the synthesis of ZNRs and its efficiency as a photo catalyst in the advanced photo assisted oxidation process for degradation of titan yellow dye.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photo-assisted mineralisation of titan yellow dye using ZnO nanorods synthesised via environmental benign route

Vidya¹,

Manjunatha

Sudeep³

et al. 2020

SN Appl. Sci.

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“…Photocatalysis has been proven to have the ability to distinguish decomposing organic compound in wastewaters, which arouse the great interest of scientists for studying the removal of dyes from wastewaters [16][17][18][19][20]. Photocatalysis is a photoinduced reaction, which is accelerated by the presence of a catalyst [21].…”

Section: Introductionmentioning

confidence: 99%

A Mild in-Situ Method to Construct Fe-Doped Cauliflower-Like Rutile TiO2 Photocatalysts for Degradation of Organic Dye in Wastewater

et al. 2019

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A mild in situ method was developed to construct an iron doped rutile TiO2 photocatalyst like cauliflower for degradation synthetic textile dye-methyl orange. The synthesized photocatalysts presented distinguished photocatalytic activity. At the optimal Fe concentration (0.5%), the decomposition rate of methyl orange (MO) was about 90% under 40 min of ultraviolet (UV) light irradiation. Whereas, to our knowledge, only 70% of the decomposition rate of MO was achieved by commercial photocatalyst P25 under the similar reaction condition. Additionally, the rutile preparation temperature did not exceed 100 °C, which was much lower than the traditional preparation calcination temperature (e.g., 600 °C). The specific surface area of Fe doped catalysts was bigger than that of the control sample and the catalyst characterization indicated that the doped iron was incorporated into the rutile TiO2 lattice and resulted in the lattice disorder. The lattice disorder would have generated surface defects in the crystal structure, which was in favor of the photocatalytic reaction. The UV-Vis diffuse refection characterization and Density Functional Theory (DFT) calculation suggested that doping a small amount of Fe into the lattice of rutile would lead to a narrower band gap and the formation of a doping energy level between conduction and valence bands of TiO2. This further increased the degradation efficiency of synthetic textile dyes in wastewaters. Our study has provided a relatively easy operation for synthesis Fe doped rutile TiO2, which is a benefit to decrease the cost in wastewater treatment process.

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“…Photocatalytic activity of TiO 2 is based on its semiconductor properties [2]. The band gap of titania is about 3.2 eV, and it occurs in three main different polymorphic phases: rutile (tetragonal, 3.02 eV), anatase (tetragonal, 3.2 eV) and brookite (ortorhombic) [3]. Thermo-chemically, the most stable polymorphic phase of these three mentioned phases is rutile.…”

Section: Introductionmentioning

confidence: 99%

Chemical modifications of nanostructured titania-based materials in photocatalytic decomposition/conversion of various organic pollutants: A short review

Krstić¹,

Stanković²,

Rubežić³

et al. 2018

Adv Techol

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Titanium dioxide, as environmental (decontamination) photocatalyst, is increasingly gaining importance in the removal of organic pollutants from water and air, as well. Different methods can be used for obtaining TiO 2 catalyst, but sol-gel and hydrothermal methods are most commonly used for the synthesis and modification of TiO 2. The properties of nanostructured materials such as crystal phase, surface features and electronic structures can be changed with doping. In this paper, the influence of Fe and Zn as dopants on the physico-chemical properties of TiO 2 catalyst will be presented based on the reported literature data. Usually applied instrumental techniques for the materials characterizations are X-ray diffraction (XRD), SEM, TEM, FTIR and UV-vis spectroscopy. The removal efficiency of various organic pollutants (organic dyes, antibiotics, pesticides, xenobiotics) is determined by the characteristics and dosage of the catalyst, nature and initial concentration of pollutants, pH, oxidants addition, light intensity and wavelength.

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Photocatalytic degradation of pollutants in petroleum refinery wastewater by TiO2- and ZnO-based photocatalysts: Recent development

Cited by 331 publications

References 144 publications

Photo-assisted mineralisation of titan yellow dye using ZnO nanorods synthesised via environmental benign route

Photo-assisted mineralisation of titan yellow dye using ZnO nanorods synthesised via environmental benign route

A Mild in-Situ Method to Construct Fe-Doped Cauliflower-Like Rutile TiO2 Photocatalysts for Degradation of Organic Dye in Wastewater

Chemical modifications of nanostructured titania-based materials in photocatalytic decomposition/conversion of various organic pollutants: A short review

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