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a b s t r a c tIt has been noticed that some chelating agents can enhance heterogeneous Fenton reactions, as well as homogeneous Fenton reactions. However, the mechanism of the enhanced heterogeneous Fenton reactions remains speculative, due to the ambiguous concurrence of homogeneous and heterogeneous reactions. In the present work, ethylene diamine tetraacetic acid (EDTA) was introduced to study the role of the chelating agent in the oxidation of dimethyl phthalate (DMP) in nano-

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“…pH is a key factor in heterogeneous catalytic reactions concerning the oxidation efficiency and the ROS generation mechanism [40]. Fig.…”

Section: Effect Of Initial Phsmentioning

confidence: 99%

EDTA enhanced heterogeneous Fenton oxidation of dimethyl phthalate catalyzed by Fe 3 O 4 : Kinetics and interface mechanism

Yang

Men

et al. 2015

Journal of Molecular Catalysis A: Chemical

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“…13) Hence, its removal improves heat transfer and reduces localized corrosion. 1) Some authors recently presented that the magnetite accelerates the corrosion of the carbon steel by a galvanic coupling. 4,5) Fushimi et al 4) showed that the hydrogen generation on the single crystal magnetite as well as the reduction of the magnetite was contributed to a galvanic corrosion of the carbon steel in sulfate solutions.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Magnetite on Carbon Steel in Fe(III)-Triethanolamine Solution and Its Corrosion Behavior

2015

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A dense and adhesive magnetite layer was successfully electrodeposited on a carbon steel in the Fe(III)-TEA solution. Electrochemical tests for the carbon steel and magnetite were conducted in an alkaline solution. These tests using the adherent magnetite specimens produced by electrodeposition is a new method to investigate the corrosion behavior of magnetite. The corrosion resistance of magnetite is superior to that of the carbon steel. When the magnetite and carbon steel are electrically contacted, the magnetite and carbon steel play the role of cathode and anode because the corrosion potential of the magnetite was higher than that of the carbon steel. If the magnetite and carbon steel are galvanically contacted to the equivalent area ratio (1 : 1), the corrosion rate of galvanic coupled carbon steel will increase by about 3.5 times than that of noncoupled carbon steel.

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“…Numerous micro-pores were clearly observed in the deposits with all the amines. The pores form when steam bubbles escape from a heated metal surface [20,31] and serve as a site for the accumulation of various chemical impurities [32][33][34]. The chemical impurities concentrated in the pores could adversely affect the SG integrity.…”

Section: Morphologies Of Depositsmentioning

confidence: 99%

Effects of Advanced Amines on Magnetite Deposition of Steam Generator Tubes in Secondary System

Lee

Hur

et al. 2021

Coatings

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Ethanolamine (ETA) is widely used to control the pH value in the secondary water of pressurized water reactors. However, it is necessary to consider other advanced amines which can replace ETA due to its serious human hazards and environmental treatment problems. The purpose of this study is to contemplate the effects of three advanced amines (ETA, 3-methoxypropylamine (MPA), and dimethylamine (DMA)) on the magnetite deposition behavior of a thermally treated (TT) Alloy 690 tubes by using a steam generator (SG) tube fouling loop in simulated secondary water. All particles were identified as a magnetite and were polyhedral or spherical in shape. When using ETA, MPA, and DMA, the average porosity of the deposits was about 34.7%, 33.0%, and 24.6%, respectively. The amount of deposits was largest when ETA was added, and it decreased by 41% when adding MPA and 55% when adding DMA. The mechanism of magnetite deposition was discussed in terms of zeta potentials of both the magnetite particles and the Alloy 690TT surface and magnetite solubility depending on the amines. To compare the potential for replacing ETA with other advanced amines, the various factors such as SG integrity, human hazards, and environmental treatment problems were discussed.

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Cited by 15 publications

References 16 publications

EDTA enhanced heterogeneous Fenton oxidation of dimethyl phthalate catalyzed by Fe 3 O 4 : Kinetics and interface mechanism

EDTA enhanced heterogeneous Fenton oxidation of dimethyl phthalate catalyzed by Fe 3 O 4 : Kinetics and interface mechanism

Electrodeposition of Magnetite on Carbon Steel in Fe(III)-Triethanolamine Solution and Its Corrosion Behavior

Effects of Advanced Amines on Magnetite Deposition of Steam Generator Tubes in Secondary System

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