A comparison of fenton oxidation and photocatalyst reaction efficiency for humic acid degradation

Jung, Hye-Ju; Hong, Ji-Sook; Suh, Jeong-Kwon

doi:10.1016/j.jiec.2012.12.036

Cited by 33 publications

(7 citation statements)

References 15 publications

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“…It is researched that attendance of AC in interaction by TiO 2 is beneficial due to its burly adsorption capability. In the same way it advances the relocation rate of the interfacial change and lessens the rejoining rate of the holes and electrons [260,261]. This synergistic effect of the interaction of AC and TiO 2 has been previously been stated for deprivation of some organic compounds in the photocatalytic process.…”

Section: Tio 2 : Ac Photocatalyst Systemmentioning

confidence: 65%

“…Thus, the organic burning rate observed on TiO 2 : AC is like heading both with surface diffusion toxin particles with the photocatalytic process rate; because adsorption occurs gradually, the variation in relative pollutant proportion with irradiation time depends on both adsorption and photodecomposition, mainly at the start of ultraviolet treatment. It is stated that the variance of the proportion of phenol (as model of organic pollutants) remaining in the solution by ultraviolet treatment time is compared for TiO 2 : AC, which were prepared by hydrolysis of tetraisopropyl orthotitanate and heat treatment at 650 to 900 ∘ C. For example, we noted that, in the duration of first 1 hour, adsorption of pH occurs in native AC and after 3 hours, in the presence of UV irradiations saturation achieved [261]. Adsorption as well as the photodecomposition of pH takes place simultaneously, but on the other side the former is supposed to become the dominate method in the beginning, being similarly latter in the next stage [221,222] trend was based on two linear processes; the change of one process to the other takes place approximately in 1 hour of irradiation.…”

Section: Tio 2 : Ac Photocatalyst Systemmentioning

confidence: 99%

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Functionalized Activated Carbon Derived from Biomass for Photocatalysis Applications Perspective

Bagheri

Julkapli

Hamid

2015

International Journal of Photoenergy

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This review highlighted the developments of safe, effective, economic, and environmental friendly catalytic technologies to transform lignocellulosic biomass into the activated carbon (AC). In the photocatalysis applications, this AC can further be used as a support material. The limits of AC productions raised by energy assumption and product selectivity have been uplifted to develop sustainable carbon of the synthesis process, where catalytic conversion is accounted. The catalytic treatment corresponding to mild condition provided a bulk, mesoporous, and nanostructure AC materials. These characteristics of AC materials are necessary for the low energy and efficient photocatalytic system. Due to the excellent oxidizing characteristics, cheapness, and long-term stability, semiconductor materials have been used immensely in photocatalytic reactors. However, in practical, such conductors lead to problems with the separation steps and loss of photocatalytic activity. Therefore, proper attention has been given to develop supported semiconductor catalysts and certain matrixes of carbon materials such as carbon nanotubes, carbon microspheres, carbon nanofibers, carbon black, and activated carbons have been recently considered and reported. AC has been reported as a potential support in photocatalytic systems because it improves the transfer rate of the interface charge and lowers the recombination rate of holes and electrons.

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Section: Tio 2 : Ac Photocatalyst Systemmentioning

confidence: 65%

Section: Tio 2 : Ac Photocatalyst Systemmentioning

confidence: 99%

Functionalized Activated Carbon Derived from Biomass for Photocatalysis Applications Perspective

Bagheri

Julkapli

Hamid

2015

International Journal of Photoenergy

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“…This increased leaching promotes the formation of radicals with sufficient oxidative potential to degrade the organic contaminants [72]. However, when the aqueous solution reaches neutral pH values, the oxidation rate of the process is delayed by the formation of solid iron oxyhydroxides (Equations ( 1)-( 4)), which are weaker activating agents than Fe 2+ (aq), resulting in decreased rate of production of HO• radicals [22,26,56]. The initial raise followed by the decay of Fe 2+ concentrations in aqueous medium after 5 min of treatment (at pH 4.5 and 5.5) shown in Figure 1(b) may indicate that there is a fast initial step of Fe dissolution caused by H 2 O 2 oxidation according to Equation (1).…”

Section: Effect Of Initial Phmentioning

confidence: 99%

“…These chemical modifications can result in the overall decrease of Total Organic Carbon (TOC) and Disinfection Byproduct Formation Potentials (DBPFP) in the treated water [17,19]. And among the AOPs, the Fenton process has already been proposed to optimize the removal of several organic contaminants from waters [8,[20][21][22][23]. This process utilizes hydrogen peroxide (H 2 O 2 ) and soluble iron (II) salts to produce a highly reactive radical (HO•) capable of oxidizing organic compounds in solution.…”

Section: Introductionmentioning

confidence: 99%

Fenton pre-oxidation of natural organic matter in drinking water treatment through the application of iron nails

Santos

Teixeira

Zhou

et al. 2021

Environmental Technology

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This study investigated for the first time the efficiency of an advanced oxidation process (AOP) zero valent iron/hydrogen peroxide (ZVI/H 2 O 2 ) employing iron nails for the removal of Natural Organic Matter (NOM) from natural water of Regent's Park lake, London, UK. The low cost of nails and their easy separation from the water after the treatment make this AOP attractive for water utilities in low-and middle-income countries. The process was investigated as a pre-oxidation step for drinking water treatment. Results showed that UV254 removal in the natural water was lower than that of simulated water containing commercial humic acid (HA), indicating a matrix effect. Statistical analysis confirmed the maximum removal of dissolved organic carbon (DOC) in natural water depends on the initial pH (best at 4.5) and H 2 O 2 dosage (best at 100% excess of stoichiometric dosage). DOC and UV254 removals under this operational condition were 51% and 89%, respectively. Molecular weight (MW) and specific UV absorbance (SUVA254) were significantly reduced to 74% and 78%, respectively. Formation of Chloroform THM in natural water sample after the ZVI/H 2 O 2 process (initial pH 4.5) was below the limit for drinking water, and 48% less than the THM formation in the same water not subjected to pre-oxidation. Characterization of oxidation products on the iron-nail-ZVI surface after the ZVI/H 2 O 2 treatment by SEM, XRD, and XPS identified the formation of magnetite and lepidocrocite. Results suggest that the investigated ZVI/H 2 O 2 process is a promising technology for removing NOM and reducing THM formation during drinking water treatment.

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“…Accordingly, this set of preliminary experiments suggested important effects of light and air bubbling taking place in the degradation of NOM through the CWPO catalytic system in the presence of Al/Fe-PILCs. A priori, it established that the Al/Fe-PILC clay catalyst exhibits photocatalytic characteristics, possibly due to either or a combination of: (i) direct absorption of radiation by the active solid (purely photocatalytic activity), (ii) light absorption by the colored dissolved NOM (photo-sensitizing effect) [34] or (iii) taking into account that in both cases the catalytic process was assisted by hydrogen peroxide, the heterogeneous photo-Fenton process could be also involved. The main motivation of this study was just to determine which of these routes are mostly contributing to NOM's degradation under light irradiation by this catalytic system, and by means of what fraction of the natural sunlight (ultraviolet and/or visible).…”

Section: Cwpo Degradation Of Nom Under Optimal Conditionsmentioning

confidence: 99%

Visible-Light Enhanced Catalytic Wet Peroxide Oxidation of Natural Organic Matter in the Presence of Al/Fe-Pillared Clay

et al. 2021

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An Al/Fe-pillared clay catalyst (Al/Fe-PILC) prepared from low cost technical-grade reagents has been investigated in the photocatalytic Wet Peroxide Oxidation (photo-CWPO) of dissolved Natural Organic Matter (NOM) under circumneutral pH. The successful pillaring of the layered clay material was confirmed by X-ray diffraction (XRD), N2 adsorption at −196 °C, cation exchange capacity (CEC) and simultaneous thermal analysis (TGA/DSC). High levels of mineralization of the dissolved organic carbon and color removal of a synthetic NOM surrogate solution were achieved even under natural lab’s lighting and ambient temperature and pressure, whereas the absence of radiation (in dark) was found to strongly affect the performance of the degradation. The photo-CWPO of NOM activated by the Al/Fe-PILC clay catalyst under visible light irradiation (LED lamp, 450 and 550 nm peaks) displayed a DOC mineralization of 72% and color removal of 73% in just 210 min of irradiation at neutral pH, whereas both responses decayed under ultraviolet lightning (λ: 365 nm) to 41% and 58%, respectively. This behavior is ascribed to formation of triplet states of natural organic matter (3NOM*) by absorption of visible light, which seems to synergistically improve the rate-determining step of the heterogeneous Fenton process, namely reduction of Fe3+ into Fe2+ on the surface of the clay catalyst. Interestingly, experiments performed at neutral and pH 3.0 showed very similar efficiencies under visible light irradiation; these findings may really facilitate the application of the photo-CWPO process to assist conventional drinking water treatment plants in the removal of NOM before the typical disinfection by chlorine to produce safer drinking water.

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A comparison of fenton oxidation and photocatalyst reaction efficiency for humic acid degradation

Cited by 33 publications

References 15 publications

Functionalized Activated Carbon Derived from Biomass for Photocatalysis Applications Perspective

Functionalized Activated Carbon Derived from Biomass for Photocatalysis Applications Perspective

Fenton pre-oxidation of natural organic matter in drinking water treatment through the application of iron nails

Visible-Light Enhanced Catalytic Wet Peroxide Oxidation of Natural Organic Matter in the Presence of Al/Fe-Pillared Clay

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