Development of High Entropy Alloy (HEA) as Catalyst for Azo Dye Degradation in Fenton Process

Abstract Azo dye is widely used in the textile industry since it is cost effective and simple to use. However, it becomes a continuous source of environmental pollution due to its carcinogenicity and toxicity. Various methods had been used to remove the azo dye in solution. One of the famous and repeatedly used is Fenton process. The Fenton’s process is one of the advanced oxidation process where iron catalysed hydrogen peroxide to generate hydroxyl radical. Treating azo dyes in solution requires a catalyst to enhance the process of degradation. Herein, high entropy alloy (HEA) has been proposed as a catalytic material to enhance the performance of Fenton process for azo dye degradation. HEA has been reported as a promising catalyst due to its high surface area. The higher the number of active sites, the higher the rate of azo dye degradation as more active sites are available for adsorption of azo dyes. The results have shown that HEA can be used as a catalyst to fasten the Fenton’s reaction since the degradation time is proven to be shorter in the presence of HEA. The method derived from the result of this study will contribute in treating azo dyes for wastewater management in Fenton process.

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Role of Enzymes From Microbes in the Treatment of Recalcitrant From Industries

Research Advancements in Pharmaceutical, Nutritional, and Industrial Enzymology - Advances in Medical Technologies and Clinical Practice ◽

10.4018/978-1-5225-5237-6.ch018 ◽

2018 ◽

pp. 395-420

Author(s):

Veena Gayathri Krishnaswamy

Keyword(s):

Fresh Water ◽

Azo Dyes ◽

Azo Dye ◽

Dye Degradation ◽

Anthropogenic Activities ◽

Bacterial Degradation ◽

Wide Range ◽

Pharmaceutical Industries ◽

Degradation Of Azo Dye

The limited availability of fresh water is a global crisis. The growing consumption of fresh water due to anthropogenic activities has taken its toll on available water resources. Unfortunately, water bodies are still used as sinks for waste water from domestic and industrial sources. Azo dyes account for the majority of all dye stuffs, produced because they are extensively used in the textile, paper, food, leather, cosmetics, and pharmaceutical industries. Bacterial degradation of azo dyes under certain environmental conditions has gained momentum as a method of treatment, as these are inexpensive, eco-friendly, and can be applied to wide range of such complex dyes. The enzymatic approach has attracted much interest with regard to degradation of azo dyes from wastewater. The oxido-reductive enzymes are responsible for generating highly reactive free radicals that undergo complex series of spontaneous cleavage reactions, due to the susceptibility of enzymes to inactivation in the presence of the other chemicals. The oxidoreductive enzymes, such as lignin peroxidase, laccases, tyrosinase, azoreductase, riboflavin reductive, polyphenol oxidase, and aminopyrine n-demethylase, have been mainly utilized in the bacterial degradation of azo dye. Along with the reductive enzymes, some investigators have demonstrated the involvement in some other enzymes, such as Lignin peroxides and other enzymes. This chapter reviews the importance of enzymes in dye degradation.

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Large-scale and facile synthesis of a porous high-entropy alloy CrMnFeCoNi as an efficient catalyst

Journal of Materials Chemistry A ◽

10.1039/d0ta04940a ◽

2020 ◽

Vol 8 (35) ◽

pp. 18318-18326 ◽

Cited By ~ 1

Author(s):

Hailong Peng ◽

Yangcenzi Xie ◽

Zicheng Xie ◽

Yunfeng Wu ◽

Wenkun Zhu ◽

...

Keyword(s):

Catalytic Activity ◽

Surface Area ◽

Large Scale ◽

High Surface ◽

High Surface Area ◽

Catalytic Performance ◽

High Entropy Alloy ◽

Facile Synthesis ◽

Efficient Catalyst ◽

High Entropy

Porous high entropy alloy CrMnFeCoNi exhibited remarkable catalytic activity and stability toward p-nitrophenol hydrogenation. The enhanced catalytic performance not only resulted from the high surface area, but also from exposed high-index facets with terraces.

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Development of a novel high-entropy alloy with eminent efficiency of degrading azo dye solutions

Scientific Reports ◽

10.1038/srep34213 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 33

Author(s):

Z. Y. Lv ◽

X. J. Liu ◽

B. Jia ◽

H. Wang ◽

Y. Wu ◽

...

Keyword(s):

Azo Dye ◽

High Entropy Alloy ◽

High Entropy ◽

Dye Solutions

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Fast Site-to-site Electron Transfer of High-entropy Alloy Nanocatalyst Driving Redox Electrocatalysis

10.21203/rs.3.rs-48124/v1 ◽

2020 ◽

Author(s):

Hongdong Li ◽

Yi Han ◽

Huan Zhao ◽

Wenjing Qi ◽

Dan Zhang ◽

...

Keyword(s):

Electron Transfer ◽

Active Sites ◽

Methanol Oxidation Reaction ◽

High Entropy Alloy ◽

Oxidation Reactions ◽

Hydrogen Electrode ◽

Efficient Catalyst ◽

High Entropy ◽

Synthesis Strategy ◽

Reduction And Oxidation

Abstract Designing electrocatalysts with high-performance for both reduction and oxidation reactions faces severe challenges. Here, the uniform and small size (~3.4 nm) high-entropy alloys (HEAs) Pt18Ni26Fe15Co14Cu27 nanoparticles (NPs) are synthesized by a simple low-temperature (<250 oC) oil phase synthesis strategy at atmospheric pressure for the first time. The Pt18Ni26Fe15Co14Cu27/C catalyst exhibits excellent electrocatalytic performance for hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). The catalyst is one of the best performance achieved by state-of-the-art alkaline HER catalysts, which shows an ultrasmall overpotential of 11 mV at the current density of 10 mA cm-2, excellent activity (10.96 A mg-1Pt at -0.07 V vs. reversible hydrogen electrode) and stability in the alkaline medium. Furthermore, it is also the most efficient catalyst (15.04 A mg-1Pt) ever reported for MOR in alkaline solution. DFT calculations confirm the multi-active sites for both HER and MOR on the HEA surface as the key factor for both proton and intermediate transformation. Meanwhile, the construction of HEA surfaces supplies the fast site-to-site electron transfer for both reduction and oxidation processes.

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Investigating degradation metabolites and underlying pathway of azo dye “Reactive Black 5” in bioaugmented floating treatment wetlands

10.21203/rs.3.rs-351058/v1 ◽

2021 ◽

Author(s):

Nain Tara ◽

Mazhar Iqbal ◽

Fazale Habib ◽

Qaiser Mahmood Khan ◽

Samina Iqbal ◽

...

Keyword(s):

Azo Dyes ◽

Azo Dye ◽

Dye Degradation ◽

Treatment Wetlands ◽

Reactive Black 5 ◽

Acinetobacter Junii ◽

Degrading Bacteria ◽

Carcinogenic Effects ◽

Successful Removal ◽

Floating Treatment Wetlands

Abstract The direct discharge of azo dyes and/or their metabolites into the environment may exert toxic, mutagenic, and carcinogenic effects on exposed fauna and flora. In this study, we analyzed the metabolites produced during the degradation of an azo dye namely Reactive Black 5 (RB5) in the bacterial augmented-floating treatment wetlands (FTWs), followed by the investigation of their underlying toxicity. To this end, a FTWs system was developed by using a common wetland plant Phragmites australis in the presence of three dye-degrading bacteria (Acinetobacter junii strain NT-15, Pseudomonas indoloxydans strain NT-38, and Rhodococcus sp. strain NT-39). We found that the FTW system effectively degraded RB5 into at least 20 different metabolites with the successful removal of color (95.5%) from the water. The fish toxicity assay revealed the non-toxic characteristics of the metabolites produced after dye degradation. Our study suggests that bacterially aided FTWs could be a suitable option for the successful degradation of azo dyes, and the results presented in this study may help improve the overall textile effluent clean-up processes.

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Phylogenetically diverse bacteria isolated from tattoo inks, an azo dye-rich environment, decoloize a wide range of azo dyes

10.21203/rs.3.rs-540195/v1 ◽

2021 ◽

Author(s):

Seong Won Nho ◽

Xue Wen Cui ◽

Ohgew Kweon ◽

Jinshan Jin ◽

Huizhong Chen ◽

...

Keyword(s):

High Throughput ◽

Azo Dyes ◽

Azo Dye ◽

Dye Degradation ◽

Methyl Red ◽

Diverse Range ◽

Optical Absorbance ◽

Wide Range ◽

Systematic Understanding ◽

Tattoo Inks

Abstract Purpose: There has been an interest in the microbial azo dye degradation as an optional method for the treatment of azo dye-containing wastes. Tattoo ink is an extremely unique azo dye-rich environment, which never been explored in terms of microorganisms capable of degrading azo dyes. Previously, we isolated 81 phylogenetically diverse bacteria, belonging to 20 genera and 49 species, contaminated in tattoo inks. In this study, we investigated if these bacteria, which can survive in the azo dye-rich environment, have an ability to degrade azo dyes. Methods: We conducted a two-step azo dye degradation (or decolorization) assay. In step 1, a high-throughput degradability assay was done for 81 bacterial isolates using Methyl Red and Oragne II. In step 2, a further degradation assay was done for 10 selected bacteria with a representative of 11 azo dyes, including 3 commercial tattoo ink azo dyes. Degradation of azo dyes were calculated from measuring optical absorbance of souble dyes at specific wavelenths. Results: The initial high-throughput azo dye assay (step 1) showed that 79 isolates had a complete or partial degradation of azo dyes; >90% of Methyl Red and Orange II were degraded within 24 h, by 74 and 20 isolates, respectively. A further evaluation of azo dye degradability for 10 selected isolates in step 2 showed that the isolates, belonging to Bacillus , Brevibacillus , Paenibacillus , and Pseudomonas , exhibited an excellent decolorization ability for a wide range of azo dyes. Conclusions: This study showed that phylogenetically diverse bacteria, isolated from azo dye-rich tattoo inks, is able to degrade a diverse range of azo dyes, including 3 azo dyes used in commercial tattoo inks. Some of the strains would be good candidates for future studies to provide a systematic understanding of azo dye degradation mechanisms

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Nanoporous High-Entropy Alloy by Liquid Metal Dealloying

Metals ◽

10.3390/met10101396 ◽

2020 ◽

Vol 10 (10) ◽

pp. 1396 ◽

Cited By ~ 2

Author(s):

Artem Vladimirovich Okulov ◽

Soo-Hyun Joo ◽

Hyoung Seop Kim ◽

Hidemi Kato ◽

Ilya Vladimirovich Okulov

Keyword(s):

Liquid Metal ◽

Noble Metals ◽

High Surface ◽

High Surface Area ◽

Catalytic Performance ◽

High Entropy Alloy ◽

Rich Phase ◽

High Entropy ◽

Surface Areas ◽

Bcc Structure

High-entropy nanomaterials possessing high accessible surface areas have demonstrated outstanding catalytic performance, beating that found for noble metals. In this communication, we report about the synthesis of a new, nanoporous, high-entropy alloy (HEA) possessing open porosity. The nanoporous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%) was fabricated from a precursor (TaMoNbV)25Ni75 alloy (at%) by liquid metal dealloying using liquid magnesium (Mg). Directly after dealloying, the bicontinuous nanocomposite consisting of a Mg-rich phase and a phase with a bulk-centered cubic (bcc) structure was formed. The Mg-rich phase was removed with a 3M aqueous solution of nitric acid to obtain the open, porous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%). The ligament size of this nanoporous HEA is about 69 ± 9 nm, indicating the high surface area in this material.

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Azo dye degradation behavior of AlFeMnTiM (M = Cr, Co, Ni) high-entropy alloys

International Journal of Minerals Metallurgy and Materials ◽

10.1007/s12613-019-1716-x ◽

2019 ◽

Vol 26 (1) ◽

pp. 124-132 ◽

Cited By ~ 10

Author(s):

Shi-kai Wu ◽

Ye Pan ◽

Ning Wang ◽

Tao Lu ◽

Wei-ji Dai

Keyword(s):

Azo Dye ◽

Dye Degradation ◽

High Entropy Alloys ◽

Degradation Behavior ◽

High Entropy

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Engineering sub-2 nm ultrasmall high-entropy alloy nanoparticles with extremely superior performance for hydrogen evolution catalysis

10.21203/rs.3.rs-145497/v1 ◽

2021 ◽

Author(s):

Dingguo Xia ◽

Guang Feng ◽

Fanghua Ning ◽

Jin Song ◽

Huaifang Shang ◽

...

Keyword(s):

Hydrogen Evolution ◽

Active Sites ◽

Large Scale ◽

Catalytic Mechanism ◽

Theoretical Calculations ◽

Superior Performance ◽

High Entropy Alloy ◽

High Entropy ◽

Formidable Challenge ◽

The Us

Abstract The development of intrinsically effective and low-cost catalysts is critical for the large-scale commercial applications of electrocatalytic hydrogen production. Although various electrocatalysts have demonstrated high activities for hydrogen evolution reaction (HER), it remains a formidable challenge to develop an extremely efficient and durable catalyst for practical use, especially in acidic media. Here, we report quinary ultrasmall NiCoFePtRh high-entropy alloy (us-HEA) nanoparticles (NPs) with extremely superior performance for HER. The us-HEA NPs are well dispersed on the carbon supports, with an average diameter of 1.68 nm, which is the smallest size in the reported HEAs. The us-HEA/C achieves an ultrahigh mass activity of 28.3 A mg-1noble metals (much higher than that of other reported advanced catalysts) at -0.05 V (vs the reversible hydrogen electrode, RHE) for HER in 0.5 M H2SO4 solution, which is 40.4 and 74.5 times higher than those of the commercial Pt/C and Rh/C catalysts, respectively. Moreover, the us-HEA/C demonstrates the highest reported turnover frequency of 30.1 s−1 at 50 mV overpotential (41.8 times higher than that of the Pt/C catalyst) and excellent stability with no decay after 10,000 cycles. Both operando X-ray absorption spectroscopy and theoretical calculations reveal the true active sites and a synergistic effect among five elements, which endow us-HEA/C with significantly enhanced HER activity. This work not only provides a general and facile strategy for synthesizing us-HEA NPs, highlights HEAs as sufficiently advanced materials in energy electrocatalysis, but also acts as a guidance for elucidating the actual reaction process and catalytic mechanism of complex multi-element systems.

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Integrated Approach On Degaradtion Of Azo Dyes Using Laccase Enzyme And Nanoparticle With Its Interaction By In Silco Analysis

10.1101/677690 ◽

2019 ◽

Cited By ~ 1

Author(s):

Rajalakshmi Sridharan ◽

Veena Gayathri Krishnaswamy ◽

Archana Murali.K ◽

Revathy Rajagopal ◽

Thirumal Kumar. D ◽

...

Keyword(s):

Azo Dyes ◽

Azo Dye ◽

Dye Degradation ◽

In Silico Analysis ◽

Integrated Approach ◽

Combined Method ◽

Severe Damage ◽

Living Organisms ◽

Laccase Enzyme ◽

Silico Analysis

ABSTRACTAzo dyes, released by the textile industries causes severe damage to the environment and living organisms. The degradation of azo dyes is widely studied using enzymatic methods. Laccase, is a copper containing enzyme that degrades the azo dyes into less toxic compounds. In this work, Laccase enzyme produced by the alkaliphile Pseudomonas mendocina in the degradation of mixed azo dye showed 0.386 U/Ml activity at pH 8.5. Combination of enzymatic and green synthesised nanoparticle were used in the degradation mixed azo dye. Laccase used in the degradation of mixed azo dyes showed 58.46% in 72 hours while the photocatalytic degradation of mixed azo dyes showed 15.98%. The degradation of azo dyes using copper iodide nanoparticle resulted in 15.835% of mixed azo dye degradation. But it was noticed that combined method removed 62.35% of mixed azo dyes in 60 minutes. Interaction of laccase enzyme with azo dyes using in silico analysis predicted the binding energy of RR (−7.19 kcal/mol), RB (−8.57 kcal/mol) and RBL (−9.17 kcal/mol).

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