Photocatalytic reduction of nitrite on CdS

Koodali, Ranjit T.; Krishnamoorthy, R.; Varadarajan, T. K.; Viswanathan, B.

doi:10.1016/1010-6030(94)03930-s

Cited by 30 publications

(12 citation statements)

References 16 publications

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“…Ammonia was the predominant product in acidic solution, and nitrite in alkaline solution; nitrite was identified as an intermediate of ammonia formation. Ranjit et al [17,[36][37][38] studied the reduction of nitrate employing a series of photocatalysts, among them ruthenium promoted titania. The product was ammonia, and nitrite could not be detected as an intermediate, although nitrite itself could also be reduced to ammonia.…”

Section: Nitrate and Titaniamentioning

confidence: 99%

Photoinduced decomposition of nitrate in drinking water in the presence of titania and humic acids

Bems

Jentoft

Schlögl

1999

Applied Catalysis B: Environmental

108

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The photoreduction of nitrate in aqueous medium was investigated at 292 K in a batch system open to the ambient. Titania was tested as a photocatalyst and humic acids were added as promoters. Conversions of 28% were reached after 80 hours when a 44 mg/l nitrate solution was irradiated with a high pressure Xe-lamp; the major product was nitrite. The addition of humic acids (20 mg/l) promoted reduction of nitrate to nitrite but the mechanism of promotion could not be unambiguously identified. Titania (0.1 g/l) itself did not catalyze the photoreduction of nitrate but rather seemed to act as a catalyst for the reoxidation of nitrite to nitrate. The most successful system was a combination of 44 mg/l nitrate, 20 mg/l humic acids and 0.1 g/l Kronos-1002 titania: the nitrate conversion reached 32% after 76 hours, with little nitrite formed. Photocatalytic nitrate degradation is accompanied by homogeneous reduction to the more toxic nitrite; requiring any effective catalyst system to also reduce nitrite concentration.

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Section: Nitrate and Titaniamentioning

confidence: 99%

Photoinduced decomposition of nitrate in drinking water in the presence of titania and humic acids

Bems

Jentoft

Schlögl

1999

Applied Catalysis B: Environmental

108

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“…In this context, photocatalytic reactions are reported in the literature to reduce bromate ions to Br À [15], nitrite and nitrate to ammonia and nitrogen [76,101], or to oxidize sulfite, thiosulfate and sulfide ions into innocuous SO 2 -…”

Section: Conversion Of Inorganic Contaminantsmentioning

confidence: 99%

Photocatalytic Processes in Membrane Reactors

Molinari

Caruso

2010

Comprehensive Membrane Science and Engineering

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“…CdS was also used for the photocatalytic reduction of nitrite under irradiation of a 150-W Xe arc lamp in highly acidic medium with sodium sulphate and sodium sulphite as sacrificial agents. And, loading with noble metals (Ru, Pd or Ir) could enhance the activity of CdS (Ranjit et al 1995). Therefore, it seems that it is worth to study how to improve the photodegradation activity of NO 2 − with CdS in a neutral environment.…”

Section: Introductionmentioning

confidence: 97%

Solar Light Photocatalytic Degradation of Nitrite in Aqueous Solution Over CdS Embedded on Metal–Organic Frameworks

Yang

Chen

et al. 2015

Water Air Soil Pollut

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A CdS embedded metal-organic framework (MIL-100) composite was synthesized and used for photocatalytic degradation of nitrite ions. The obtained samples were characterized by a series of techniques such as X-ray diffraction (XRD), N 2 adsorption/desorption, transmission electron microscopy (TEM) and UVVis diffuse reflectance spectra (DRS). The results show that CdS nanoparticles were dispread and embedded on the MIL-100 crystals. The CdS/MIL-100 composites exhibited significant activities for photocatalytic degradation of nitrite ions through a disproportionation process in a neutral aqueous solution without any sacrificial reagents. When 20 wt% of CdS was embedded, the highest degradation yield of 92 % was achieved in 10-ppm NaNO 2 aqueous solution under simulated solar light irradiation, which was fivefold of bare CdS. The enhancement in photocatalytic activities could be contributed to photosensitization and supporting of metalorganic framework scaffold.

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Photocatalytic reduction of nitrite on CdS

Cited by 30 publications

References 16 publications

Photoinduced decomposition of nitrate in drinking water in the presence of titania and humic acids

Photoinduced decomposition of nitrate in drinking water in the presence of titania and humic acids

Photocatalytic Processes in Membrane Reactors

Solar Light Photocatalytic Degradation of Nitrite in Aqueous Solution Over CdS Embedded on Metal–Organic Frameworks

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