Alternative chelating agents: Evaluation of the ready biodegradability and complexation properties

Martins, João Carlos; Neto, Isabel F.F.; Pinto, Isabel S.S.; Soares, Eduardo V.; Barros, M. Teresa; Soares, Helena

doi:10.1080/10934529.2014.846706

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…1), is a constituent of bacterial spores. PDA revealed to be a ready-biodegradable compound according to the OECD guidelines (Martins et al 2014), and due to its ability to complex with metal ions, it has been studied for remediation of soils (Macauley and Hong 1995;Hong and Chen 1996), used in detergents and cleaning applications (Rattinger et al 1994;Boskamp 1990). It is mentioned as a component of a bleaching composition by Turner et al (1997), but the study was focused on the textile bleaching and was used in a hydrogen peroxide composition together with other compounds.…”

Section: Introductionmentioning

confidence: 99%

Pre-treatment of the paper pulp in the bleaching process using biodegradable chelating agents

Pinto¹,

Ascenso

Barros

et al. 2013

Int. J. Environ. Sci. Technol.

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The aim of this work was to study the application of two biodegradable chelating agents, pyridine-2,6-dicarboxylic acid (PDA) and methylglycinediacetic acid (MGDA), in the treatment of the pulp, prior to hydrogen peroxide bleaching. Such compounds must remove transition metals (Mn, Fe and Cu) from pulp, that catalyze the degradation of hydrogen peroxide, and Ca, which is also problematic due to the formation of precipitates that accumulate in the equipment. Computer simulations were first performed to study the best conditions for metal complexation, and optimum pH was defined as 5-5.5 for PDA and 6.5-7 for MGDA. Metals removal from the pulp, as well as the subsequent bleaching process (Q-P1-Paa-P2), were tested experimentally, and performances were compared to ethylenediaminetetracetic acid (EDTA). PDA removed both Mn and Ca efficiently, leaving most Mg in the pulp after first chelation stage, while MGDA had a lower Ca removal, even using a higher pH and concentration. Residual hydrogen peroxide and kappa number after peroxide stages showed a similar bleaching efficiency between the studied compounds and EDTA.

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Section: Introductionmentioning

confidence: 99%

Pre-treatment of the paper pulp in the bleaching process using biodegradable chelating agents

Pinto¹,

Ascenso

Barros

et al. 2013

Int. J. Environ. Sci. Technol.

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“…There are certain requirements toward these newly developing reagents . First, they should not harm the environment.…”

Section: Introductionmentioning

confidence: 99%

“…There are certain requirements toward these newly developing reagents. 12 First, they should not harm the environment. Ideally they should be completely biodegradable, and their production should not be accompanied by the formation of hazardous waste.…”

Section: Introductionmentioning

confidence: 99%

Novel Biodegradable Chelating Agents for Micronutrient Fertilization

Brusko,

Garifullin,

Geniyatullina

et al. 2023

J. Agric. Food Chem.

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Serious concerns about the negative impact of ethylenediaminetetraacetic acid (EDTA) on the environment resulted in severe restrictions imposed on this compound in many countries. One of the main concerns is related to the use of EDTA in agriculture as a chelator in microelement fertilizers: being introduced directly into the sawing fields, it penetrates into groundwater, with no chance to be captured/recycled. Respectively, there is an active search for environmentally friendly, biodegradable alternatives for this chelator. In this study, we proposed a biodegradable chelating agent, 2-((1,2-dicarboxyethyl)amino)pentanedioic acid (IGSA). It was synthesized in accordance with the principles of "green chemistry" from readily available nonhazardous precursors using water as a solvent; in addition, the method yields literally no waste. The synthesized chelator in the form of the crude reaction mixture was further used for preparing a multicomponent micronutrient fertilizer (B, Zn, Fe, Cu, Mn, and Mo). The fertilizer was shown to be highly biodegradable (72% in 28 days), while the EDTA-based product degraded only by 13%. The plant growing efficiency was tested on lettuce in the greenhouse experiments. The results were compared against the known commercial fertilizers based on EDTA and iminodisuccinic acid (IDS). The newly developed IGSA-based fertilizer significantly outperformed the EDTA-based fertilizer in lettuce biomass (1.4 and 1.6 times for root and foliar application, respectively). The total mineral uptake was almost two times higher (1.9 and 1.8 times for root and foliar treatments, respectively) compared to the EDTA-based complex and even slightly higher (1.2 and 1.1 times, respectively) compared to the IDS-based complex. Our work opens the doors for the industrial scale production and application of this fully "green", inexpensive microelement fertilizer that has the potential to replace the EDTA-based products.

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“…Chelating agents are often used as an extraction method for the removal of inorganics from biomass, including those that have these detrimental effects. One of the most common of these chelating agents is ethylenediaminetetraacetic acid (EDTA), which has shown high efficiency in heavy metal removal from preservative-treated wood. − This chelating agent, however, is not biodegradable and is hazardous to the environment, , causing its use to be restricted or banned for various applications in European countries . Alternatives to EDTA such as 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP) and 2,6-pyridine dicarboxylic acid (PDA) are gaining popularity for inorganic removal because of their extraction efficiency comparable to that of traditional chelating agents as well as their biodegradability .…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Process for Recovery of Wood Preservative from Used Copper Naphthenate-Treated Railroad Ties

Haber

Kim

Chmely

et al. 2017

ACS Sustainable Chem. Eng.

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Removal of copper naphthenate (CN) from used wooden railroad ties was investigated to improve the commercial viability of this biomass as a fuel source and avoid alternative disposal methods such as landfilling. Bench-scale thermal desorption of organic preservative components from CN-impregnated ties was followed by extraction of the copper fraction with ethylenediaminetetraacetic acid, 1hydroxy ethylidene-1,1-diphosphonic acid, or 2,6-pyridine dicarboxylic acid (PDA). Naphthenic acid (NA) and carrier oil were recovered at desorption temperatures between 225 and 300°C and could potentially be recycled to treat new ties. The thermal treatment also mimicked torrefaction, improving the biomass properties for use as a thermochemical conversion feedstock. Chelation with PDA, a biodegradable chelating agent, after desorption had the highest extraction efficiency of copper and other naturally present inorganics, extracting 100% of the copper from both the raw and 225°C-treated samples. Optimized desorbed material showed a 64% decrease in ash content when extracted with PDA; however, extraction efficiency decreased as desorption temperature increased, indicating that thermal treatment caused the inorganics to be less extractable. We concluded that the optimum desorption conditions were between 250 and 275°C for 45 min followed by extraction with PDA when considering both NA removal and inorganic extraction efficiency.

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Alternative chelating agents: Evaluation of the ready biodegradability and complexation properties

Cited by 8 publications

References 36 publications

Pre-treatment of the paper pulp in the bleaching process using biodegradable chelating agents

Pre-treatment of the paper pulp in the bleaching process using biodegradable chelating agents

Novel Biodegradable Chelating Agents for Micronutrient Fertilization

Environmentally Friendly Process for Recovery of Wood Preservative from Used Copper Naphthenate-Treated Railroad Ties

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