Arsenic oxidation by UV radiation combined with hydrogen peroxide

Sorlini, Sabrina; Gialdini, Francesca; Stefan, Mihaela I.

doi:10.2166/wst.2010.799

Cited by 20 publications

(10 citation statements)

References 6 publications

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“…Previous studies have investigated the oxidation of As(III) by UV/H 2 O 2 [21][22][23][24][25], and the removal of arsenic using EC [6,15,[26][27][28][29][30] and ECP [31,32]. Meanwhile, a limited number of papers have explored the PECP process mainly for the treatment of organics via •OH formation [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Arsenic Removal by Advanced Electrocoagulation Processes: The Role of Oxidants Generated and Kinetic Modeling

et al. 2020

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Arsenic (As) is a naturally occurring element in the environment that poses significant risks to human health. Several treatment technologies have been successfully used in the treatment of As-contaminated waters. However, limited literature has explored advanced electrocoagulation (EC) processes for As removal. The present study evaluates the As removal performance of electrocoagulation, electrochemical peroxidation (ECP), and photo-assisted electrochemical peroxidation (PECP) technologies at circumneutral pH using electroactive iron electrodes. The influence of As speciation and the role of oxidants in As removal were investigated. We have identified the ECP process to be a promising alternative for the conventional EC with around 4-fold increase in arsenic removal capacity at a competitive cost of 0.0060 $/m3. Results also indicated that the rate of As(III) oxidation at the outset of electrochemical treatment dictates the extent of As removal. Both ECP and PECP processes reached greater than 96% As(III) conversion at 1 C/L and achieved 86% and 96% As removal at 5 C/L, respectively. Finally, the mechanism of As(III) oxidation was evaluated, and results showed that Fe(IV) is the intermediate oxidant generated in advanced EC processes, and the contribution of •OH brought by UV irradiation is insignificant.

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Section: Introductionmentioning

confidence: 99%

Arsenic Removal by Advanced Electrocoagulation Processes: The Role of Oxidants Generated and Kinetic Modeling

et al. 2020

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“…The preoxidation of As(III) to As(V) is regarded as a critical process for decreasing As toxicity and improving total As removal using treatment methods such as adsorption and co-precipitation [1,2]. To date, a large number of chemical oxidants have been developed for highly efficient oxidation of As(III) to As(V), and include ozone [3], chlorine [4] and hydrogen peroxide [2,5,6]. Nevertheless, these oxidants are not environmentally friendly, producing toxic byproducts [7], and therefore it is highly desirable to explore other alternatives [8].…”

Section: Introductionmentioning

confidence: 99%

Morphology-dependent enhancement of arsenite oxidation to arsenate on birnessite-type manganese oxide

Hou

Xiang

Zheng

et al. 2017

Chemical Engineering Journal

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Birnessite-type manganese oxide is a highly efficient oxidant that has been investigated widely for As(III) oxidation.Nevertheless, As(III) oxidation rate is inevitably reduced due to favorable adsorption of coexisting ions and As(V) which passivate its surface. In this paper we explore a novel strategy to significantly improve As(III) oxidation rate by controlling birnessite morphology. Batch investigations revealed that As(III) oxidation was greatly improved with nanoflower-like birnessite (Bir-NF) compared to nanowire-(Bir-NW) and nanosheet-like (Bir-NS) birnessites.Changing birnessite morphology from nanosheet to nanoflower not only improved As(III) oxidation rate, from 1.4 to 24.7 μmol g -1 min -1 , but also reduced the antagonistic effects of As(V) and coexisting ion adsorption on As(III) removal. The origin of morphology-dependent enhancement of As(III) removal was experimentally and theoretically studied by As(V) adsorption on birnessites, phosphate adsorption kinetics, detection of dissolved Mn 2+ concentration, average Mn oxidation state, point of zero charge, and density functional theory (DFT) calculations. Results revealed that significant enhancement of As(III) oxidation activity in Bir-NF was attributed to its highly efficient contact between As(III) species and manganese oxide, as well as the rapid charge transfer from As to Mn atom due to its highest oxygen vacancy defect concentration, thus significantly promoting As(III) oxidation activity.

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“…Strong oxidants (e.g. potassium permanganate, chlorine, ozone, H 2 O 2 , UV and Fenton reagent) are often used in the pre-oxidation process to enhance the inherently slow oxidation process of As(III), [12][13][14] for example, taking 2-5 days in the presence of pure oxygen or 4-9 days in the presence of air to achieve the complete oxidation. [15] The main concern behind the addition of oxidants into waters is that this could cause the secondary pollution problems induced by oxidant residuals and/or oxidation by-products in groundwater and soil.…”

Section: Introductionmentioning

confidence: 99%

The oxidation of As(III) in groundwater using biological manganese removal filtration columns

Yang

Sun

et al. 2015

Environmental Technology

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Arsenic is known as a toxic element to humans, and has been reported to co-exist with iron and manganese in groundwater worldwide. The typical method for arsenic removal from groundwater is to oxidize trivalent (As(III)) to pentavalent (As(V)) followed by the As(V) removal. This study aims to evaluate the oxidization efficiency of As(III) in a mature biological manganese (Mn(2+)) removal filtration system with different elevated influent As(III) concentrations. The effects of influent Mn(2+) concentrations, influent As(III) concentrations, filtration rates and dissolved oxygen (DO) levels on the efficiency of As(III) oxidation were assessed. The results showed that As(III) oxidation can be simultaneously achieved with removing Mn(2+) in the filtration system. The oxidation efficiency was not impacted by increasing the influent As(III) concentration up to nearly 2500 µg L(-1), but the filtration rate was limited at 11 m h(-1) for maintaining the effluent As(III) concentration below 10 µg L(-1). The oxidation process followed first-order kinetics with the constant reaching 0.56-0.61 min(-1). The As(III) oxidation process was most likely to be mediated by the bacterial community initially developed for Mn(2+) removal in the filtration system, which performed the catalytic oxidation for As(III).

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Arsenic oxidation by UV radiation combined with hydrogen peroxide

Cited by 20 publications

References 6 publications

Arsenic Removal by Advanced Electrocoagulation Processes: The Role of Oxidants Generated and Kinetic Modeling

Arsenic Removal by Advanced Electrocoagulation Processes: The Role of Oxidants Generated and Kinetic Modeling

Morphology-dependent enhancement of arsenite oxidation to arsenate on birnessite-type manganese oxide

The oxidation of As(III) in groundwater using biological manganese removal filtration columns

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