Photocatalytic reduction of aromatic nitro compounds using CdS nanostructure under blue LED irradiation

Eskandari, Parvin; Kazemi, Foad; Zand, Zahra

doi:10.1016/j.jphotochem.2013.09.011

Cited by 84 publications

(51 citation statements)

References 40 publications

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“…Photocatalytic processes are widely applied in environmental treatments such as sewage treatment and air purification , . Moreover, photocatalysis has been proven to be a promising and green technique for selective organic synthesis . Photocatalytic reduction of aromatic nitro compounds has received increasing interest and provides an alternative to conventional processes for synthesizing aniline .…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Photocatalysis in Microreactors for Efficient Reduction of Nitrobenzene to Aniline: Mechanisms and Energy Efficiency

2019

Chem Eng & Technol

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Aniline was synthesized from nitrobenzene through photo‐induced reduction in microreactors under UV irradiation. Nitrobenzene solution and the nanofluid prepared by a TiO2 nanocatalyst, PEG‐400, and deionized water were mixed in a capillary microreactor. The effects of catalyst composition, residence time, and substrate concentration on the reaction performance were systematically investigated. The conversion of nitrobenzene and the yield of aniline reached high values under optimized conditions. The excellent reusability of the photocatalyst was realized for four runs. A mechanism was proposed for this photocatalytic reduction process based on reaction kinetics. Both photo‐induced electrons and •CO2− could reduce nitrobenzene to aniline. The photonic efficiency in the microreactor was still much higher than that obtained in batch reactors, which was mainly attributed to the much larger effective radiation area of the microreactor.

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Section: Introductionmentioning

confidence: 99%

Heterogeneous Photocatalysis in Microreactors for Efficient Reduction of Nitrobenzene to Aniline: Mechanisms and Energy Efficiency

2019

Chem Eng & Technol

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“…The photoreactor uses a visible LED to enhance photoreduction of amines using methanol and isopropanol as electron donors (hole scavenger). The conversion was about 90% with a selectivity of about 71% [120]. A CFD simulation experimental and validation of a UV LED photoreactor for Escherichia coli disinfection.…”

Section: Application Of Traditional Photoreactors and Leds In Mining mentioning

confidence: 97%

Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals

et al. 2019

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For gold extraction, the most used extraction technique is the Merrill-Crow process, which uses lixiviants as sodium or potassium cyanide for gold leaching at alkaline conditions. The cyanide ion has an affinity not only for gold and silver, but for other metals in the ores, such as Al, Fe, Cu, Ni, Zn, and other toxic metals like Hg, As, Cr, Co, Pb, Sn, and Mn. After the extraction stage, the resulting wastewater is concentrated at alkaline conditions with concentrations up to 1000 ppm of metals. Photocatalysis is an advanced oxidation process (AOP) able to generate a photoreaction in the solid surface of a semiconductor activated by light. Although it is well known that photocatalytic processes can remove metals in solution, there are no compilations about the researches on photocatalytic removal of metals in wastewater with cyanide. Hence, this review comprises the existing applications of photocatalytic processes to remove metal and in some cases recover cyanide from recalcitrant wastewater from gold extraction. The use of this process, in general, requires the addition of several scavengers in order to force the mechanism to a pathway where the electrons can be transferred to the metal-cyanide matrices, or elsewhere the entire metallic cyanocomplex can be degraded by an oxidative pathway.

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“…Lately our group have reported on activated amorphous TiO 2 coated into periodic mesoporous organosilicas (PMOs) [40], TiO 2 -N Doped [41], β-Cyclodextrin / TiO 2 [42], and CdS [43][44] as efficient photocatalysts for synthesis of selective organic transformation under visible light. Moreover, we have reported that TiO 2 -P25 showed selectivity of over 80% for reduction of a series of nitrobenzens under sunlight and LED irradiation [45].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic synthesis of anilides from nitrobenzenes under visible light irradiation: 2 in 1 reaction

Zand

Kazemi

Partovi

2015

Journal of Photochemistry and Photobiology B: Biology

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Photocatalytic reduction of aromatic nitro compounds using CdS nanostructure under blue LED irradiation

Cited by 84 publications

References 40 publications

Heterogeneous Photocatalysis in Microreactors for Efficient Reduction of Nitrobenzene to Aniline: Mechanisms and Energy Efficiency

Heterogeneous Photocatalysis in Microreactors for Efficient Reduction of Nitrobenzene to Aniline: Mechanisms and Energy Efficiency

Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals

Photocatalytic synthesis of anilides from nitrobenzenes under visible light irradiation: 2 in 1 reaction

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