Use of Ethylenediaminetetraacetic Acid as a Scavenger for Chromium from “Wet Blue” Leather Waste: Thermodynamic and Kinetics Parameters

Resende, José Evandro de; Gonçalves, Mateus A.; Oliveira, Luiz C.A.; Cunha, Elaine F. F. da; Ramalho, Teodorico C.

doi:10.1155/2014/754526

Cited by 11 publications

(7 citation statements)

References 41 publications

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“…EDTA is a water-soluble polymer commonly used as a chelating agent to dissociate cells from the extracellular matrix (ECM) by binding to divalent metal ions. Also, EDTA has been utilized as a complexing agent for the removal of metal ions [ 37 ]. EDTA has gained significant importance in nanoscience, being used as a stabilizer in the fabrication of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Role of capping agents in the application of nanoparticles in biomedicine and environmental remediation: recent trends and future prospects

et al. 2020

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Capping agents are of utmost importance as stabilizers that inhibit the over-growth of nanoparticles and prevent their aggregation/coagulation in colloidal synthesis. The capping ligands stabilize the interface where nanoparticles interact with their medium of preparation. Specific structural features of nanoparticles are attributed to capping on their surface. These stabilizing agents play a key role in altering the biological activities and environmental perspective. Stearic effects of capping agents adsorbed on the surface of nanoparticles are responsible for such changing physico-chemical and biological characteristics. Firstly, this novel review article introduces few frequently used capping agents in the fabrication of nanoparticles. Next, recent advancements in biomedicine and environmental remediation approaches of capped nanoparticles have been elaborated. Lastly, future directions of the huge impact of capping agents on the biological environment have been summarized.

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Section: Introductionmentioning

confidence: 99%

Role of capping agents in the application of nanoparticles in biomedicine and environmental remediation: recent trends and future prospects

et al. 2020

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“…Besides, the chromium ionic forms in chrome tanning liquid are all cations, which conforms to the Convington’s theory: Generally, the chrome tanning agents combined with the carboxyl groups rather than other functional group on collagen fibers in tanning process. In addition, the Gibbs energy change (Δ G (aq)) was −286.66 kcal/mol, which indicated that the complexation reaction between chromium and collagen fibers was favorable to occur …”

Section: Resultsmentioning

confidence: 99%

“…In addition, the Gibbs energy change (ΔG(aq)) was −286.66 kcal/mol, which indicated that the complexation reaction between chromium and collagen fibers was favorable to occur. 34 In the adjusting process of the CL system, a large amount of sulfuric acid was used to dissolve the mud cake, and the participation of acid can turn the precipitated chromium into ionic forms. However, the addition of sulfuric acid results also leads to low pH (below 1.5) and the low basicity of regenerated Cr agent.…”

Section: ■ Introductionmentioning

confidence: 99%

Mechanism and Effect of High-Basicity Chromium Agent Acting on Cr-Wastewater-Reuse System of Leather Industry

Cao

Wang

Zhou

et al. 2018

ACS Sustainable Chem. Eng.

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Chrome-containing waste is the major stumbling block for the leather industry. However, in current leather manufacturing, chrome tanning is difficult to replace due to the excellent characteristics it endows on the finished leather and because Cr agents play a key role in tanning. To reduce the increasing serious chrome pollution, this study establishes a Cr-wastewater loop system (CL system) to reuse Cr effluents through high-basicity chromium agent adjusting, and the mechanisms of Cr agent with different basicities affecting the CL system were explored. The basicity of Cr agent represented the number of free hydroxyls attached to the chromium atoms, which decided the binding capacity between Cr agent and collagen. Therefore, the existence forms of Cr complexes at different basicities was investigated, and the possible binding sites of Cr 3+ ions and chrome were calculated and analyzed by molecular docking. The result emphasized that highbasicity Cr agent was effective in treating Cr wastewater. The high-basicity Cr agent balances the existing forms of Cr complexes to enhance the quality of finished leather produced by CL system. After 20 cycles of Cr-wastewater reuse, Cr 3+ concentration in effluent was lower than 5 mg/L. It suggested that CL system was capable of removing chrome ions from Cr wastewater. Afterward, by analyzing the physicochemical properties, we saw that shrinkage temperature of the wet-blue produced from CL system reached 102 °C and the tensile strength was over 13 MPa, which was even to those of traditional tanning methods and meets national standards. Meantime, the organoleptic properties such as softness and grain smoothness are comparable to those of the wet-blue leather tanned by 33% basicity Cr agent as well. Therefore, the new CL system not only reduces chrome pollution from the tanning process but also ensures the high quality of leather.

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“…The main difficulty encountered in the disposal or use of tanned waste is the presence of heavy metals. Several studies to immobilize [7] or strengthen chromium fixation [8] on skins, have been evaluated and alternative chrome-free tanning systems have been made [9,10]. It is, therefore, not surprising that numerous studies have focused on reducing the environmental impact and making the process sustainable [11].…”

Section: Introductionmentioning

confidence: 99%

Selection of Tanned-Leather Waste in Recovering Novel Raw Material for Manufacturing Rubber Artifacts: Towards a Zero-Waste Condition

2020

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Zero-waste is an ambitious goal to encourage sustainable production, consumption optimum recycling and resource recovery. The recycling and resource recovery of chrome-tanned leather waste is a difficult proposition because of the three-dimensional chemical network of collagen, which renders leather waste incompatible to polymer matrices. Many attempts have been undertaken to reuse leather waste, most of them require technological processes and challenging chemical pretreatments, which make the reuse an economically disadvantageous industrial operation. The paper aims to show how a very fine separation of leather solid waste leads to raw materials suitable for mixtures with natural rubber, without any chemical pretreatment. In other words, the paper intends to be a stimulus to manage leather solid waste carefully to start a cleaner and more profitable production. In particular, various industrial compounds containing different concentrations of post-tanning dyeing, or chrome shaving or oil-tanning and natural rubber were vulcanized through a standard preparation. Some compounds were also reinforced with carbon black and the vulcanization kinetics were monitored through rheometer. Experimental results indicate that there exists an optimal concentration of waste such that post-tanning dyeing post-tanning and chrome shaving are suitable for manufacture floor mats, soles and heels while oil-tanning waste can be used for making hose or conveyor belts. The mechanical performances of the articles prepared by direct mixing with leather waste are the same as those of commercially distributed rubber products.

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Use of Ethylenediaminetetraacetic Acid as a Scavenger for Chromium from “Wet Blue” Leather Waste: Thermodynamic and Kinetics Parameters

Cited by 11 publications

References 41 publications

Role of capping agents in the application of nanoparticles in biomedicine and environmental remediation: recent trends and future prospects

Role of capping agents in the application of nanoparticles in biomedicine and environmental remediation: recent trends and future prospects

Mechanism and Effect of High-Basicity Chromium Agent Acting on Cr-Wastewater-Reuse System of Leather Industry

Selection of Tanned-Leather Waste in Recovering Novel Raw Material for Manufacturing Rubber Artifacts: Towards a Zero-Waste Condition

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