Photocatalytic degradation of bisphenol A in the presence of C-doped ZnO: Effect of operational parameters and photodegradation mechanism

Bechambi, Olfa; Sayadi, Sami; Najjar, Wahiba

doi:10.1016/j.jiec.2015.08.017

Cited by 153 publications

(42 citation statements)

References 54 publications

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“…The IBP removal decreased from 98.6% to 76.8% when the initial concentration increased from 10 mg/L to 30 mg/L. The decrease can be ascribed to the saturation of the photocatalytic active sites by higher concentration of substrate and reduction the photons interaction [12,24]. Due to the saturation, the drug molecules cannot easily contact with the photo-induced holes of catalyst [25].…”

Section: Effect Of Catalyst Dosagementioning

confidence: 99%

“…Due to the saturation, the drug molecules cannot easily contact with the photo-induced holes of catalyst [25]. On the other hand, with increasing initial concentration, more IBP molecules were adsorbed on the catalyst surface, and the generation of OH radicals at the catalyst surface was reduced since the active sites were occupied by IBP molecules [24,26]. …”

Section: Effect Of Catalyst Dosagementioning

confidence: 99%

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Investigation of Photocatalytic Activity of Chitosan/Poly(vinyl alcohol)/TiO2/Boron Nanocomposites

Şimşek

2017

SDÜ Fen Bil Enst Der

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In the current work, A series of chitosan/poly(vinyl alcohol)/TiO2/boron nanocomposites (CS/P/Ti-B) were prepared and their activity in the photocatalytic removal of non-steroidal anti-inflammatory drug (ibuprofen (IBP)) were evaluated for the first time. The nanocomposites were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrum (FT-IR), and thermogravimetric analysis (TG-DTG). TGA thermograms showed the enhanced thermal stability of nanocomposites with increasing Ti-B content. In the photocatalytic experiments, the effects of Ti-B content, catalyst dosage and initial concentration were discussed and a suitable photodegradation process for enhanced removal was proposed. The photocatalytic removal of IBP increased with increasing Ti-B ratio and the kinetic rate constant of Ti-B increased from 4.516 × 10 −2 min -1 (for raw Ti-B) to 5.346 × 10 −2 min -1 (for CS/P/Ti-B/1). This increment could be attributed to the decreased recombination rate of the photogenerated electron-hole pairs. Özet: Bu çalışmada, kitosan/poli vinil alkol/TiO2/bor nanokompozitleri (CS/P/Ti-B) sentezlenmiş ve non-steroidal anti-inflamatuar ilaç (ibuprofen (IBP)) fotokatalitik giderim performansları ilk kez incelenmiştir. Nanakompozitler; taramalı elektron mikroskobu (SEM), X-ray fotoelektron spektroskopisi (XPS), Fourier Dönüşümlü Kızılötesi (FTIR) Spektroskopisi ve termogravimetrik analiz (TG-DTG) ile karakterize edilmiştir. TGA termogram sonuçlarına göre, Ti-B içeriği arttıkça nanokompozitlerin termal kararlılığının arttığı gözlenmiştir. Fotokatalitik çalışmalarda yapıdaki Ti-B içeriği, katalizör dozu ve başlangıç konsantrasyon etkisi incelenmiş ve uygun bir fotobozunma prosesi tartışılmıştır. Ti-B oranı arttıkça IBP fotokatalitik bozunma oranı artmış ve kinetik hız sabiti 4.516 × 10 −2 dak -1 '(saf Ti-B için) değerinden 5.346 × 10 −2 dak -1 (CS/P/Ti-B/1 için) değerine yükselmiştir. Bu artış, ışın altında uyarılmış elektron boşluk çiftlerinin düşük rekombinasyon hızından kaynaklanmaktadır. Kitosan

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Section: Effect Of Catalyst Dosagementioning

confidence: 99%

Section: Effect Of Catalyst Dosagementioning

confidence: 99%

Investigation of Photocatalytic Activity of Chitosan/Poly(vinyl alcohol)/TiO2/Boron Nanocomposites

Şimşek

2017

SDÜ Fen Bil Enst Der

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“…(3)), which could react with the trapped electron to generate H 2 O 2 molecules (Eq. (4)) [10,11]. The hydrogen peroxide groups then interact with the generated conduction-band electrons to produce more hydroxyl radicals (Eq.…”

Section: Kineticmentioning

confidence: 99%

“…In the past few years, nanophotocatalytic decolorization of environmental pollutants has become a popular technique. For example, Bechambi et al reported that C-doped ZnO catalysts possessed good photocatalytic activities under UV irradiation in the presence of hydrogen peroxide (H 2 O 2 ) [10]. Li et al found that Ag-AgBr/CaWO 4 composite microsphere exhibited a good photocatalytic activity under visible light irradiation [11].…”

Section: Introductionmentioning

confidence: 99%

Application of graphene quantum dots as green homogenous nanophotocatalyst in the visible-light-driven photolytic process

Roushani

Mavaei

Daneshfar

et al. 2016

J Mater Sci: Mater Electron

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“…The generated electrons react with water molecules leading to the production of highly reactive hydroxyl radicals (OHÁ), which initiate micropollutant degradation in addition to direct hole attack (Arany et al 2014). To reduce the recombination rate and improve quantum yield, TiO 2 and ZnO have been modified through doping with metals or non-metals or coupling with other semiconductors (Bechambi et al 2015b;Otieno et al 2017). The coupling of ZnO with TiO 2 has gained interest recently as it results in the formation of a hybrid semiconductor (TiO 2 -ZnO) with superior photocatalytic activity and stability (Behzadnia et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Investigating the synergy of integrated anaerobic digestion and photodegradation using hybrid photocatalyst for molasses wastewater treatment

Mabuza

Otieno

Apollo

et al. 2017

Euro-Mediterr J Environ Integr

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Anaerobic digestion (AD) can remove the high organic load of molasses wastewater (MWW), but is ineffective in removing the characteristic dark brown colour caused by biorecalcitrant melanoidin. Ultraviolet (UV) photodegradation, can mineralise the biorecalcitrants leading to complete colour removal, but with a high-energy input and low organic load removal. This study investigated the plausibility of integrating the two processes for organic load and colour reductions. Desk scale AD and photodegradation processes were carried out in batch reactors. A hybrid photocatalyst consisting of titanium dioxide (TiO 2 ) and zinc oxide (ZnO) was used for photocatalytic degradation. Biodegradation at thermophilic conditions in the bioreactor achieved high total organic carbon (TOC) and chemical oxygen demand (COD) reductions of 80 and 90%, respectively, but with an increased colour intensity. Contrastingly, UV photodegradation achieved a high colour reduction of 92% with an insignificant 6% TOC reduction, after 30 min of irradiation. During photodegradation, the mineralisation of the biorecalcitrant organic compounds led to the colour disappearance. The energy required for the TOC reduction was 40-fold higher than that required for the colour reduction in the same irradiation period, suggesting that the UV process was only suitable for colour reduction. Therefore, there is a possible synergy when the two processes are integrated, with AD preceding UV, where AD removes the high COD/TOC while UV removes the recalcitrant colour at a reduced cost.

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Photocatalytic degradation of bisphenol A in the presence of C-doped ZnO: Effect of operational parameters and photodegradation mechanism

Cited by 153 publications

References 54 publications

Investigation of Photocatalytic Activity of Chitosan/Poly(vinyl alcohol)/TiO2/Boron Nanocomposites

Investigation of Photocatalytic Activity of Chitosan/Poly(vinyl alcohol)/TiO2/Boron Nanocomposites

Application of graphene quantum dots as green homogenous nanophotocatalyst in the visible-light-driven photolytic process

Investigating the synergy of integrated anaerobic digestion and photodegradation using hybrid photocatalyst for molasses wastewater treatment

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