Heterogeneous photocatalytic mineralisation of phenols in aqueous solutions

Lathasree, S.; Rao, A. S.; Sivasankar, B.; Sadasivam, V.; Rengaraj, K.

doi:10.1016/j.molcata.2003.08.032

Cited by 249 publications

(123 citation statements)

References 13 publications

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“…In the acidic pH (pH 5), 4-CP was well adsorbed on the photocatalyst surface and showed higher degradation rate than alkaline pH. Lathasree et al [56] reported the photocatalytic degradation of phenol and chlorophenols with ZnO under UV light. Significant phenol degradation was achieved at neutral and mildly acidic pH.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

Chowdhury¹,

Nag²,

Ray³

2017

Phenolic Compounds - Natural Sources, Importance and Applications

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Phenolic compounds are found in surface and groundwater as well as wastewater from several industries. It is necessary to eliminate phenols and phenolic compounds from contaminated water before releasing into water bodies due to their toxicity to human beings. Photocatalytic degradation seems to be a promising technology for the degradation of several phenolic compounds. Complete mineralization of phenol and phenolic compound has been achieved with TiO 2 -based photocatalysts under both UV and visible-light irradiation. This chapter will evaluate the conventional processes and advanced oxidation processes for the degradation of phenol and phenolic compounds. The process economics and efficiencies of different advanced oxidation processes will also be discussed. The main focus of the chapter is photocatalytic degradation processes under UV and visible light along with a detailed review of several factors affecting degradation of phenol and phenolic compounds. Photocatalytic degradation process is governed by reactions with hydroxyl radical or superoxide ion. The extent of degradation depends on light sources (UV, visible, and solar), the type of photocatalyst, and experimental conditions (pH, photocatalyst dosage, initial concentration of phenolic compounds, light intensity, electron donor concentration, etc.). Visible-light-active photocatalysts are applied by several researchers to exploit sunlight and to make the photocatalysis process sustainable. In the future, using sunlight in place of UV could make photocatalysis economically more efficient.

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Section: Effect Of Solution Phmentioning

confidence: 99%

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

Chowdhury¹,

Nag²,

Ray³

2017

Phenolic Compounds - Natural Sources, Importance and Applications

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“…At a high m-cresol concentration, the presumption is that active sites are covered by m-cresol and its intermediates that can cause reduced generation of e --h + , which reduces photodegradation efficiency (Konstantinou, et al, 2004). The other possibility is that as the initial m-cresol concentration increases but the mass of photocatalyst, the intensity of light and illumination time are constant, then the •OH and O 2 2-species formed on the surface of photocatalyst are constant, so that the relative ratio of the •OH and O 2 2-for attacking m-cresol decreases and the % photodegradation decreases (Lathasree, et al, 2004). Another factor which may be responsible for the reduction in photocatalytic degradation rate is the competition between adsorbed m-cresol and H 2 O molecules for photodegraded h + .…”

Section: Effect Of M-cresol Concentrationmentioning

confidence: 99%

Photodegradation of m-cresol by Zinc Oxide under Visible-light Irradiation

Abdollahi¹,

Abdullah²,

Zainal³

et al. 2011

IJC

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The photodegradation of m-cresol was carried out under visible light (46% sunlight) by ZnO as photocatalyst. To measure the efficiency of photodegradation, the different variables studied included amount of photocatalyst, concentration of m-cresol and pH. The maximum amount of photocatalyst and concentration of m-cresol was 1.5 g/L and 25 ppm respectively. The photodegradation was favorable in the pH 6-9 range. The detected intermediates were 2-methyl-1,4-benzodiol, 2-methyl-para-benzoquinone, 3,5-dihydroxytoluene and 2,5-dihydroxy-benzaldehyde. TOC studies show that 78% of total organic carbon is removed from solution during irradiation time. This study indicates the great potential of ZnO to remove aqueous m-cresol under visible-light irradiation which is part of sunlight.

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“…Photocatalytic treatment of environmental pollutants such as polychlorinated phenolic chemicals is documented to be effective to the point of complete mineralisation [1][2][3][4][5]. Photocatalysis is an advanced oxidation process (AOP) technology that degrades organic classes of compound at near ambient conditions [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

Khuzwayo

Chirwa

2015

Journal of Hazardous Materials

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This study investigated, modelled and simulated the influence of multi-chlorohalogenation in heterogeneous photocatalytic degradation of substituted phenols (pentachlorophenol (PCP), trichlorophenol (TCP), dichlorophenol (DCP), and monochlorophenol (CP)). The LangmuirHinshelwood approach was applied to determine oxidation kinetics. Aquasim 2.0 computational software was used to model, simulate and estimate model parameters of the different chlorophenols. Chemical adsorption equilibrium isotherms for the four chlorophenols and phenol were studied and modelled for adsorption onto titanium dioxide (TiO 2 ) semiconductor catalyst. Langmuir adsorption parameters were determined and used to calculate adsorption constant and maximum adsorption capacity. The adsorption of chloride phenolics onto titanium dioxide catalyst increased in the order of 4-CP < DCP < Ph < TCP < PCP. Photocatalytic studies analysed the efficiency of oxidation and found improved degradation with higher chloride substituted phenolics in the order of PCP > TCP > DCP ≥ 4-CP. Photocatalytic parameters were calculated and estimated along with sensitivity and uncertainty analyses.

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Heterogeneous photocatalytic mineralisation of phenols in aqueous solutions

Cited by 249 publications

References 13 publications

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

Photodegradation of m-cresol by Zinc Oxide under Visible-light Irradiation

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

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