Microwave-enhanced catalytic degradation of 4-chlorophenol over nickel oxides under low temperature

Lai, Teh-Long; Liu, Jyong-Yue; Yong, Kim-Fui; Shu, Youn‐Yuen; Wang, Chen-Bin

doi:10.1016/j.jhazmat.2008.01.009

Cited by 22 publications

(5 citation statements)

References 35 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%

“…Other semiconductor catalsts has demonstrated its efficiency in degrading a wide range of chlorophenols. (Stoyanova et al, 2003;Lai et al, 2008;Stoyanova and Christoskova, 2011). NiO is a vital semiconductor widely used as a catalyst with extraordinary electrical, thermal, catalytic, and redox properties (Stoyanova et al, 2006;Devulapelli and Sahle-Demessie, 2008).…”

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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“…Transition metal oxides have proved to be active in the photocatalytic reactions of the elimination of chlorophenols and its derivatives [14-16]. In this study, NiO was selected as the alternative semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of 4-chlorophenol by UV/H2O2/NiO process in aqueous solution

Alimoradzadeh

Assadi

Nasseri

et al. 2012

J Environ Health Sci Engineer

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The removal of 4-chlorophenol from aqueous phase continues to be an important environmental issue. In this work, the photochemical oxidation of 4-chlorophenol in aqueous solutions in a batch reactor using ultraviolet irradiation, hydrogen peroxide and nickel oxide was studied. The efficiency of the system was evaluated with respect to reaction time, pH, feed concentration of reactants, catalyst load, light intensity, and the reaction rate constant. The concentrations of 4-chlorophenol and chloride ions were determined by high performance liquid chromatography and ion chromatography, respectively. Pure nanosized nickel oxide was characterized by X-ray diffraction and scanning electron microscopy. The results showed that the optimum conditions (the complete 4-chlorophenol removal (100%) at 60 min) were obtained at a neutral pH, with 0.2 mol/L H2O2, and 0.05 g/L of nickel oxide. However, no pH effects were observed in the range of 4–10. Analytical profiles on 4-chlorophenol transformation were consistent with the best line fit of the first-order kinetics. Moreover, the degradation rate constant increased with both UV light intensity and decreasing initial concentration of 4-chlorophenol. Finally, the results of mineralization and chloride ions studies indicated that dechlorination was better accomplished but more time was required to completely mineralize 4-chlorophenol into water and carbon dioxide.

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“…In our previous work, we have succeeded in the degradation of 200 ppm phenol and 4-CP using a microwave-enhanced catalytic degradation (MECD) method under 30 min [36,39,40]. However, various factors can influence activity, such as the pH of 4-NP, and temperature and types of catalysts.…”

Section: Introductionmentioning

confidence: 99%

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

Lai

Yong

et al. 2011

Journal of Hazardous Materials

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Microwave-enhanced catalytic degradation of 4-chlorophenol over nickel oxides under low temperature

Cited by 22 publications

References 35 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

Photocatalytic degradation of 4-chlorophenol by UV/H2O2/NiO process in aqueous solution

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

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