Effect of boron on reactivity and apparent corrosion rate of microscale zerovalent irons

Velimirović, Milica; Larsson, Per‐Olof; Simons, Queenie; Bastiaens, Leen

doi:10.1016/j.jece.2017.03.029

Cited by 5 publications

(6 citation statements)

References 47 publications

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“…For example, the very first test by Reardon [36] is 28 years old and has been cited only 386 times, an average of 14 times per year. This is practically insignificant in a context where hundreds of articles on Fe 0 remediation are published every year [107][108][109][110][111]. The Reardon test [36] requires large quantities of Fe 0 (about 500 g) and sophisticated equipment to monitor the H 2 evolution [34,42,90,110].…”

Section: Current Approaches To Address Fe 0 Qualitymentioning

confidence: 99%

“…This is practically insignificant in a context where hundreds of articles on Fe 0 remediation are published every year [107][108][109][110][111]. The Reardon test [36] requires large quantities of Fe 0 (about 500 g) and sophisticated equipment to monitor the H 2 evolution [34,42,90,110]. The Phen test using 1,10-Phenanthroline to complex Fe II from iron corrosion suffers from the toxicity of this chemical.…”

Section: Current Approaches To Address Fe 0 Qualitymentioning

confidence: 99%

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Developing the Ascorbic Acid Test: A Candidate Standard Tool for Characterizing the Intrinsic Reactivity of Metallic Iron for Water Remediation

Cui¹,

Xiao

Tao³

et al. 2023

Water

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Granular metallic iron (gFe0) materials have been widely used for eliminating a wide range of pollutants from aqueous solutions over the past three decades. However, the intrinsic reactivity of gFe0 is rarely evaluated and existing methods for such evaluations have not been standardized. The aim of the present study was to develop a simple spectrophotometric method to characterize the intrinsic reactivity of gFe0 based on the extent of iron dissolution in an ascorbic acid (AA—0.002 M or 2 mM) solution. A modification of the ethylenediaminetetraacetic acid method (EDTA method) is suggested for this purpose. Being an excellent chelating agent for FeII and a reducing agent for FeIII, AA sustains the oxidative dissolution of Fe0 and the reductive dissolution of FeIII oxides from gFe0 specimens. In other words, Fe0 dissolution to FeII ions is promoted while the further oxidation to FeIII ions is blocked. Thus, unlike the EDTA method that promotes Fe0 oxidation to FeIII ions, the AA method promotes only the formation of FeII species, despite the presence of dissolved O2. The AA test is more accurate than the EDTA test and is considerably less expensive. Eight selected gFe0 specimens (ZVI1 through ZVI8) with established diversity in intrinsic reactivity were tested in parallel batch experiments (for 6 days) and three of these specimens (ZVI1, ZVI3, ZVI5) were further tested for iron leaching in column experiments (for 150 days). Results confirmed the better suitability (e.g., accuracy in assessing Fe0 dissolution) of the AA test relative to the EDTA test as a powerful screening tool to select materials for various field applications. Thus, the AA test should be routinely used to characterize and rationalize the selection of gFe0 in individual studies.

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Section: Current Approaches To Address Fe 0 Qualitymentioning

confidence: 99%

Section: Current Approaches To Address Fe 0 Qualitymentioning

confidence: 99%

Developing the Ascorbic Acid Test: A Candidate Standard Tool for Characterizing the Intrinsic Reactivity of Metallic Iron for Water Remediation

Cui¹,

Xiao

Tao³

et al. 2023

Water

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“…In addition, mZVIs removed chlorinated aliphatic hydrocarbons more effectively than nZVIs when the ZVI material was used singly for field applications according to 112 field case studies provided in the literatures [ 13 ]. Recently, less expensive mZVI particles have been developed as a substitute for nZVIs to effectively degrade chlorinated hydrocarbons because of the high cost of nZVI and shortened lifetime due to high surface reactivity and fast corrosion rate with water [ 13 , 14 , 15 ]. The objective of this work was to evaluate the effectiveness of the highly porous sponge ZVI micro-particles in reducing CCl 4 under laboratory conditions.…”

Section: Introductionmentioning

confidence: 99%

Degradation Characteristics of Carbon Tetrachloride by Granular Sponge Zero Valent Iron

Zhu

Han

et al. 2021

IJERPH

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Granular sponge zero valent iron (ZVI) was employed to degrade carbon tetrachloride (CCl4). The effects of acidic washing, initial solution pH, and ZVI dosage on CCl4 degradation were investigated. Results showed that CCl4 was effectively removed by ZVI and approximately 75% of CCl4 was transformed into chloroform through hydrogenolysis. The rate of chloroform transformation was slower compared to that of CCl4, resulting in chloroform accumulation. CCl4 degradation was a pseudo first-order process. The observed pseudo first-order reaction rate constant (kobs) for CCl4 and chloroform were 0.1139 and 0.0109 h−1, respectively, with a ZVI dosage of 20 g/L and an initial CCl4 concentration of 20 mg/L. Surface acidic washing had a negligible effect on CCl4 degradation with ZVI. The kobs for CCl4 degradation increased linearly with increasing ZVI dosage and the optimal dosage of ZVI was 20 g/L based on the surface area-normalized rate constants. The negative relationship between kobs and the solution pH indicated that the degradation of CCl4 by ZVI performed better under weakly acidic conditions.

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“…Specific surface areas of microparticles are generally lower than 2 m² g -1 (Wang and Zhang 1997;Lien and Zhang 2001). However, the reactivity is not only linked to the specific surface area but also the chemical composition and presence of impurities on the surface, such as carbon, oxygen, sulfur or boron content (Lin and Lo 2005;Velimirovic et al 2013aVelimirovic et al , 2017. Standardized experiments have shown that the specific reaction rate constant (k SA ) for COCs degradation with mZVI particles are in the same order of magnitude than those obtained with nZVI particles, while iron corrosion occurs slowly (Velimirovic et al 2013b(Velimirovic et al , 2014.…”

Section: Nanoscale and Microscale Particlesmentioning

confidence: 99%

In Situ Chemical Reduction of Chlorinated Organic Compounds

Rodrigues

Betelu

Colombano

et al. 2020

Applied Environmental Science and Engineering for a Sustainable Future

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Chlorinated organic compounds (COCs) are common anthropogenic contaminants of soil and groundwater. COCs were industrially produced for different applications, such as dry cleaning, degreasing, or as pesticides. The presence of COCs in the environment is a major concern because of their toxicity and persistence.The most widely used method for their remediation is the conventional pump-and-treat system. However, this technology can hardly achieve a complete remediation because of geological characteristics and the presence of pore space pollution/adsorbed pollution, leading to a residual saturation. Hence, in addition to the improvement of pump-and-treat systems, in situ chemical processes have been largely developed. These chemical processes involve the injection of chemical reagents for the removal of residual source pollution and/or the treatment of plume contamination. Chemical degradation of COCs can be achieved by oxidative or reductive processes. If chemical oxidation has been first developed for in situ application, chemical reduction is one of the most important emerging remediation techniques for COCs treatment. Due to the electronegative character of chlorine substituents, COCs can effectively be transformed via reductive pathways. Moreover, reductive dechlorination has shown higher efficiency on highly chlorinated compounds. This chapter focuses on the presentation of the chemical reduction of the most common COCs pollutants, followed by kinetic and mechanistic approaches related to the use of iron-based particles. Developments on in situ chemical reduction technologies in order to enhance remediation rates are also exposed. Influence of environmental conditions for in situ applications is then developed. Finally, a case study is presented.

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Effect of boron on reactivity and apparent corrosion rate of microscale zerovalent irons

Cited by 5 publications

References 47 publications

Developing the Ascorbic Acid Test: A Candidate Standard Tool for Characterizing the Intrinsic Reactivity of Metallic Iron for Water Remediation

Developing the Ascorbic Acid Test: A Candidate Standard Tool for Characterizing the Intrinsic Reactivity of Metallic Iron for Water Remediation

Degradation Characteristics of Carbon Tetrachloride by Granular Sponge Zero Valent Iron

In Situ Chemical Reduction of Chlorinated Organic Compounds

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