Experimental study of As(III) oxidation by hydrogen peroxide

Molnar, L.; Vircikova, E.; Lech, Peter

doi:10.1016/0304-386x(94)90013-2

Cited by 31 publications

(8 citation statements)

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“…The oxidation of arsenic by oxygen under ambient conditions without the use of a catalyst, although thermodynamically feasible, is a prolonged chemical process . Some effective arsenic oxidation processes have been developed employing strong oxidants such as KMnO 4 , H 2 O 2 , SO 2 /O 2 , and O 3 to achieve suitable oxidation percentage and reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

Novel Continuous Column Process for As(III) Oxidation from Concentrated Acidic Solutions with Activated Carbon Catalysis

Mahandra

Ghahreman

2020

Ind. Eng. Chem. Res.

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This work pertains to a novel continuous column process for As(III) oxidation using commercial activated carbon as a promising catalyst in acidic solutions on a minipilot scale. Notable efficiency of arsenic oxidation is validated in continuous column tests treating 5 g/L As(III) acidic solutions with activated carbon in the presence of oxygen. Residence time, pH, dissolved oxygen, and initial As(III) concentration are proved to be the significant impacting parameters on the arsenic oxidation process. Insights into the oxidation pathway by Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) illustrate that the efficient oxidation of arsenic is attributed to the ample oxygen functionalities on the carbon surfaces, which play a role in the in situ formation of hydrogen peroxide. This study provides a promising process for the application of activated carbon in arsenic oxidation from highly concentrated arsenic waste solutions in the mining and metal industries.

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Section: Introductionmentioning

confidence: 99%

Novel Continuous Column Process for As(III) Oxidation from Concentrated Acidic Solutions with Activated Carbon Catalysis

Mahandra

Ghahreman

2020

Ind. Eng. Chem. Res.

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“…Chemicals such as chlorine, bleaching powder, ozone, hydrogen peroxide or potassium permanganate rapidly oxidize As(III) to As(V) under a wide range of conditions (Jekel, 1994;Molnar et al, 1994;Kim and Nriagu, 2000). Table 1 gives a summary of the benefits and drawbacks associated with the use of various oxidation technologies.…”

Section: Pre-treatmentmentioning

confidence: 99%

Technological options for the removal of arsenic with special reference to South East Asia

Jain¹,

Singh

2012

Journal of Environmental Management

137

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Arsenic contamination in ground water, used for drinking purpose, has been envisaged as a problem of global concern. However, arsenic contamination of ground water in parts of South East Asia is assuming greater proportions and posing a serious threat to the health of millions of people. A variety of treatment technologies based on oxidation, co-precipitation, adsorption, ion exchange and membrane process are available for the removal of arsenic from ground water. However, question remains regarding the efficiency and applicability/appropriateness of the technologies, particularly because of low influent arsenic concentration and differences in source water composition. Some of these methods are quite simple, but the disadvantage associated with them is that they produce large amounts of toxic sludge, which needs further treatment before disposal into the environment. Besides, the system must be economically viable and socially acceptable. In this paper an attempt has been made to review and update the recent advances made in the technological development in arsenic removal technologies to explore the potential of those advances to address the problem of arsenic contamination in South East Asia.

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“…27−29 The transformation of As(III) via cathodic polarization is also a possibility as a result of reduction of oxygen and formation of H 2 O 2 , 14 a known oxidant of As(III). 30 The As(V) so formed via anodic and/or cathodic polarization of As(III) can be easily electro-sorbed onto the anode surface since As(V) is mostly present as negatively charged species at the pH of groundwaters. The electrochemical oxidation of high concentrations of As(III) with subsequent electro-sorption of As(V) has been examined previously.…”

Section: Introductionmentioning

confidence: 99%

“…While untested to date, it is hypothesized that sequential removal of As(III) and As(V) may be achieved by DPSC with oxidation of aqueous As(III) via anodic and/or cathodic polarization and subsequent electro-sorption of As(V) at the anode. Anodic oxidation of As(III) may be initiated by direct electron transfer and/or by reaction with hydroxyl radicals generated on oxidation of H 2 O although the latter process requires high energy input. − The transformation of As(III) via cathodic polarization is also a possibility as a result of reduction of oxygen and formation of H 2 O 2 , a known oxidant of As(III) . The As(V) so formed via anodic and/or cathodic polarization of As(III) can be easily electro-sorbed onto the anode surface since As(V) is mostly present as negatively charged species at the pH of groundwaters.…”

Section: Introductionmentioning

confidence: 99%

Modified Double Potential Step Chronoamperometry (DPSC) Method for As(III) Electro-oxidation and Concomitant As(V) Adsorption from Groundwaters

Song

Garg

et al. 2019

Environ. Sci. Technol.

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Constrained by low energy efficiency and ineffectiveness in As(III) removal under circumneutral pH conditions by many exsiting technologies, As(III) removal has become an issue. In this work we present proof of concept of a modified double potential step chronoamperometry (DPSC) method of As(III) oxidation and concomitant As(V) electro-sorption from aqueous solution. Results show that in situ anodic As(III) oxidation, As(V) electro-sorption, and As(V) electro-desorption are affected by aqueous pH with high oxidation and sorption/desorption rates observed at the elevated pH. We particularly show that effective As(III) oxidation and concomitant As(V) adsorption are related to (i) the rapid oxidation of the deprotonated species compared to the protonated species and (ii) stronger electrochemical interaction between the multicharged As(V) species and the electrodes. At 1.2 V and an electric energy consumption of 0.06 kWh m–3, the total As concentration can be reduced from 150 to 15 μg L–1 using an electrochemical cell with electrode area of 10 × 8 cm2 and electro-sorption time of 120 min. On the basis of the experimental results, we have developed a mathematical model to describe the kinetics and mechanism of arsenic removal by the modified DPSC method with this model of use in predicting, and potentially optimizing, process performance under various conditions.

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Experimental study of As(III) oxidation by hydrogen peroxide

Cited by 31 publications

References 0 publications

Novel Continuous Column Process for As(III) Oxidation from Concentrated Acidic Solutions with Activated Carbon Catalysis

Novel Continuous Column Process for As(III) Oxidation from Concentrated Acidic Solutions with Activated Carbon Catalysis

Technological options for the removal of arsenic with special reference to South East Asia

Modified Double Potential Step Chronoamperometry (DPSC) Method for As(III) Electro-oxidation and Concomitant As(V) Adsorption from Groundwaters

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