High efficiency degradation of 4-nitrophenol by microwave-enhanced catalytic method

Lai, Teh-Long; Yong, Kim-Fui; Yu, Jenwei; Chen, Jung‐Hui; Shu, Youn‐Yuen; Wang, Chen-Bin

doi:10.1016/j.jhazmat.2010.09.044

Cited by 94 publications

(28 citation statements)

References 50 publications

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“…The results of study showed that photodegradation of phenol using UV/TiO2/H2O2 process was much more effective than using either UV/H2O2 or UV/TiO2 process (Chiou et al, 2008). Similar results by different catalysts for 4-CP removal were observed with those reported by other studies (Stoyanova et al, 2003;Lai et al, 2008;Wang et al, 2009;Lai et al, 2011).…”

Section: Effect Of Operational Conditions On 4-cp Removalsupporting

confidence: 83%

“…The results of research work have proved that the recovered nickel oxides particles had a catalytic activity as well as the properties of the product before use (He et al, 2010). Recently, photocatalytic degradation of organic pollutants using NiO particles has gained considerable attention (Stoyanova et al, 2003;Lai et al, 2007;Lai et al, 2011). The drawback of NiO particles might be the influence on the amount of mineralization and the presence of nanoparticles in the effluent.…”

Section: Introductionmentioning

confidence: 99%

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Effect of operational conditions on removal of 4-chlorophenol in water using UV/NiO process

Assadi¹,

Nasseri²

2014

Global NEST Journal

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This study present the removal of 4-chlorophenol (4-CP) from water by nickel oxide (NiO) nanoparticles. Photodegradation was compared using different processes in a batch reactor with medium-pressure mercury lamp irradiation. The effects of operating conditions such as feed concentration of reactants, catalyst load, pH, and half-life time on photodegradation system were evaluated. The results showed that photodegradation using UV/NiO system in the presence of H2O2 were much more effective than using either UV/H2O2 or UV/NiO processes. The optimum conditions for the complete degradation of 4-CP were achieved at a neutral pH, with 0.2 mol l -1 H2O2, and 0.05 g l -1 of NiO. However, no significant pH effects were observed in the range of 4-10. Also, the best TOC removal and Cl -ions formation results were achieved by combined system with 48 and 80%, respectively. The illuminated NiO nanoparticles had lower influence on the degradation of 4-CP but dramatically promoted the mineralization of 4-CP. For all these reactions, the degradation rates are evaluated by determining their first-order rate constants and half-life times. The reaction rate constants ranged from 0.0003 min −1 by direct photolysis to 0.029 min −1 and 0.083 min −1 using UV/NiO in absent and presence of H2O2, respectively.

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Section: Effect Of Operational Conditions On 4-cp Removalsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Effect of operational conditions on removal of 4-chlorophenol in water using UV/NiO process

Assadi¹,

Nasseri²

2014

Global NEST Journal

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“…Although 4-nitrophenol (4-NP) is a class of pollutant, stable in the environment and resistant to biodegradation [30] [31], it can be transformed to safety compound 4-aminophenol (4-AP) by using AgNPs due to their catalytic properties. The aim of the present work is to synthesize various sizes of spherical AgNPs using trisodium citrate as a surfactant material.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Silver Nanoparticles and Their Use in Catalytic Reduction of 4-Nitrophenol

Al-Marhaby¹,

Seoudi²

2016

WJNSE

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Silver nanoparticles of various sizes were prepared at room temperature using silver nitrate as a precursor, various molar ratios of sodium citrate as a surfactant stabilizing material and sodium borohydride as a reducing agent. The morphology, distribution and sphericity of the particles were assessed in images from a transmission electron microscope (TEM). The sizes of the particles were calculated as being 9, 11 and 14 nm. The effects of the particles' sizes on the plasmon bands were confirmed by ultraviolet-visible spectra measurements. The prepared samples were applied in photo catalysis of 4-Nitrophenol (4-NP), and the rate constant was determined as 0.05 s −1 , 0.0015 s −1 and 0.00021 s −1 for particles of 9 nm, 11 nm and 14 nm, respectively. Due to their high surface energy, the smaller particle sizes were more active in the photo catalytic application.

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“…Nitrophenols are severe environmental pollutants due to its anthropogenic, toxic and inhibitory nature so their reduction is very important. But they are used extensively in chemical industries for the manufacture of pesticides, pharmaceutical and synthetic dyes [34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Surfactant-assisted morphological tuning of porous metallic silver sponges: facile synthesis, characterization and catalytic performance

Sheikh

Naikoo

Thomas

et al. 2015

J Sol-Gel Sci Technol

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Nanoporous sponges have many advantages over bulk catalyst structures in terms of providing regular framework of pores and conformational stability. In this paper, precise tuning of porosity and surface morphology in silver sponges for the catalytic reduction of p-nitro phenol to p-amino phenol was explored. The silver spongy catalysts are reusable and stable. The porous catalysts were characterized before calcination by FTIR and TGA and after calcination by XRD, SEM and BET techniques. Catalytic performance of the silver sponges was confirmed by spectrophotometric technique, and it was concluded that the porosity and adsorption capability of silver sponges were responsible for their outstanding catalytic performance. Graphical AbstractThe calcined silver monoliths displayed a potential catalytic activity against the reduction of 4-nitrophenol which is a serious environmental pollutant to 4-aminophenol which is an important intermediate in the synthesis of various analgesic and antipyretic drugs. Fig. (a)-(e) Time-dependent successive UV-vis spectra showing the reduction of 4-nitrophenol catalyzed by 0.06 mg of different silver monolith catalysts (a) Ag/Triton X-100, (b) Ag/Triton X-100/dextran, (c) Ag/Triton X-100/ TMB, (d) Ag/Triton X-100/Ludox (HF treated). (e)

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High efficiency degradation of 4-nitrophenol by microwave-enhanced catalytic method

Cited by 94 publications

References 50 publications

Effect of operational conditions on removal of 4-chlorophenol in water using UV/NiO process

Effect of operational conditions on removal of 4-chlorophenol in water using UV/NiO process

Preparation and Characterization of Silver Nanoparticles and Their Use in Catalytic Reduction of 4-Nitrophenol

Surfactant-assisted morphological tuning of porous metallic silver sponges: facile synthesis, characterization and catalytic performance

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