Sunlight assisted photocatalytic mineralization of nitrophenol isomers over W6+ impregnated ZnO

Hameed, Abdul; Aslam, M.; Ismail, Iqbal M.I.; Chandrasekaran, S.; Kadi, Mohammad W.; Gondal, M.A.

doi:10.1016/j.apcatb.2014.05.023

Cited by 59 publications

(51 citation statements)

References 60 publications

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“…With favorable potential of the conduction band edge of ZnO (−0.31 V) for the reduction of O 2 to superoxide anion, the failure of pure ZnO in the efficient decolorization of dye depicts the loss of majority of charge carriers in recombination process. The significant decrease in the luminescence intensity in the PL spectra (Hameed et al 2014) supports the trapping of excited electrons by surface W 6+ species. The efficient decolorization especially by 1 % W 6+ -loaded ZnO depicts the enhanced generation of oxidizing species in the system.…”

Section: Photocatalytic Degradation Of Dyesmentioning

confidence: 90%

“…The detailed procedure for the synthesis and characterization of the impregnated catalysts is detailed in our previous communication (Hameed et al 2014). …”

Section: Methodsmentioning

confidence: 99%

“…The characterization of the W 6+ -impregnated catalysts by UV-visible diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction analysis (XRD), and field emission scanning electron microscopy (FESEM) is discussed in detail in our earlier communication (Hameed et al 2014). …”

Section: Characterizationmentioning

confidence: 99%

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How the Dyes Are Degraded/Mineralized in a Photocatalytic System? The Possible Role of Auxochromes

Aslam

Ismail

Chandrasekaran

et al. 2015

Water Air Soil Pollut

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The capability of W 6+ -impregnated ZnO photocatalysts for sunlight mineralization of a variety of structurally different dyes has been investigated. Compared to bare ZnO, the W 6+ -loaded photocatalysts showed significantly higher activity for the decolorization as well as mineralization of dyes, and complete mineralization was noticed in a short span of 150 min. The results obtained by various analytical tools were correlated to estimate the mechanistic aspects of the decolorization/mineralization process and to identify the nature of the oxidizing species involved in the process. A strong dependence of the decolorization/ mineralization process was observed on the nature and number of auxochromes attached to color-generating conjugated system. The rapid decolorization/ mineralization of the dyes and release of corresponding anions with the decolorization of dyes suggested the involvement of charged rather than radical reactive oxygen species (ROS) in the oxidation process. LangmuirHinshelwood kinetic model was found to be best suited for evaluating the kinetics of mineralization process. The e ff ec tiv en es s o f t h e c a t a l y s t s fo r t h e decolorization/mineralization of a mixture of dyes was also examined. The suitability of the catalysts for successive use in sunlight exposure was also evaluated.

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Section: Photocatalytic Degradation Of Dyesmentioning

confidence: 90%

“…The detailed procedure for the synthesis and characterization of the impregnated catalysts is detailed in our previous communication (Hameed et al 2014). …”

Section: Methodsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

How the Dyes Are Degraded/Mineralized in a Photocatalytic System? The Possible Role of Auxochromes

Aslam

Ismail

Chandrasekaran

et al. 2015

Water Air Soil Pollut

Self Cite

View full text Add to dashboard Cite

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“…Recently, visible light driven photocatalysis has attracted increasing attention because of its applicability in taking advantage of sunlight to eliminate environmental pollutants [1][2][3][4]. TiO 2 is one of the most widely investigated photocatalysts due to its high activity, low cost, and availability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic performance over Bi4Ti3O12 nanosheets with controllable size and exposed {0 0 1} facets for Rhodamine B degradation

Chen

Jiang

Jin

et al. 2016

Applied Catalysis B: Environmental

228

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“…Güneşli havada öğlen saatlerinde elde edilen ortalama UV enerjisi değeri, bölgesel çalışmalarla 30 W/m 2 olarak belirlenmiş ve bu değer referans alınarak farklı çalışmalarda elde edilen bir çok sonucun normalizasyonu sağlanmaktadır [52]. Birim UV enerjisi ile farklı mikrokirleticilerin fotokatalitik giderim verimlilikleri, TOK giderim verimi üzerinden değerlendirilerek Tablo 3'te ifade edilmektedir [9,35,57].…”

Section: İnce-film Fotokataliz Heterojen Fotokataliz (Askıda Sistem)unclassified

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

Özkal¹,

Pagano²

2016

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZSu kaynaklarında sıklıkla rastlanan mikrokirleticilerin, alıcı ortamdaki çevresel etkileri ve mevcut arıtma sistemleri ile etkin giderilememeleri sebebiyle gelecek yıllarda yasal sınırlamaların hedefi olması beklenmektedir. Özellikle farmasötikler ve geniş kullanım alanına sahip antibiyotikler, hem üretimleri, hem de tüketimleri sonrasında çevreye salınmakta ve alıcı ortamı tehdit etmektedir. Biyolojik arıtma sistemleri başta olmak üzere konvansiyonel arıtma proseslerinin, antibiyotiklerin gideriminde yetersiz kaldığı görülmektedir. Antibiyotiklerin biyolojik olarak bozunmaya dirençli yapısı oksidasyon potansiyeli yüksek olan ileri oksidasyon proseslerinin kullanımını gerektirmektedir. Fotokataliz prosesleri, eko-toksik etkisinin minimum düzeyde olması ve antibiyotikleri mineralize edebilme potansiyeli ile önemli bir detoksifikasyon prosesidir. Ayrıca prosesin güneş enerjisi ile işletilebilir olması, deneysel çalışma ve pilot ölçekli uygulamalara olan ilgiyi arttırmaktadır. Bu çalışma ile literatürde askıda sistem ve yüzeyde sabitlenme prensibine göre yürütülmekte olan fotokataliz prosesi çalışmalarının temel prensip ve mekanizmaları, antibiyotik giderimi ve bakteri inaktivasyonu açısından değerlendirilmektedir. Proses parametrelerinin, büyük ölçekli uygulamaların yaygınlaşması ve prosesin modellenmesi hedeflerine uygun olarak ele alınması üzerinde durulmuştur. Anahtar Kelimeler: Antibiyotik giderimi, bakteri inaktivasyonu, fotokataliz EVALUATION OF ANTIBIOTICS AND ANTIBIOTIC RESISTANT BACTERIA REMOVAL BY PHOTO-CATALYSIS ABSTRACTMicro-pollutants are one of the most commonly encountered pollutants in water resources. Because of environmental impacts and insufficient rates of removal at the prevalent treatment plant, they involve the most specific pollutants that will be the target of future legislations. Following their production and consumption, releases of effluents pose a threat to the receiving environment. Conventional but most essentially of biological treatment plants, are mostly ineffective for removal of antibiotics. Advanced oxidation processes with their high oxidation potentials have the utmost potential for total mineralization of antibiotics that have non-biodegradable structure. Photo-catalysis is superior with its process mechanism causing relatively lower eco-toxicity and able to provide total mineralization and may be nominated as a detoxification process option. Since photo-catalysis has potential to be operated under solar irradiation, there is growing interest in both laboratory scale experiments and pilot scale applications.

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Sunlight assisted photocatalytic mineralization of nitrophenol isomers over W6+ impregnated ZnO

Cited by 59 publications

References 60 publications

How the Dyes Are Degraded/Mineralized in a Photocatalytic System? The Possible Role of Auxochromes

How the Dyes Are Degraded/Mineralized in a Photocatalytic System? The Possible Role of Auxochromes

Enhanced photocatalytic performance over Bi4Ti3O12 nanosheets with controllable size and exposed {0 0 1} facets for Rhodamine B degradation

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

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