Removal Study of Crystal Violet and Methylene Blue From Aqueous Solution by Activated Carbon Embedded Zero-Valent Iron: Effect of Reduction Methods

Wang, Yongmei; Chen, Tiantian; Zhang, Xiaolin; Mwamulima, Teza

doi:10.3389/fenvs.2021.799264

Cited by 11 publications

(6 citation statements)

References 47 publications

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“…The pH PZC was found to be 9.2. This means that the adsorption of an anionic dye is favored at pH < pH PZC and, at the same time, due to the negatively charged surface of the adsorbent, it can be used for the adsorption of cationic dyes. , The results obtained for the CR adsorption are in good agreement with the pH PZC experiment, whereas the highest amount adsorbed for CV was recorded at neutral pH.…”

Section: Resultsmentioning

confidence: 99%

Iron–Iron Oxide Core–Shell Nanochains as High-Performance Adsorbents of Crystal Violet and Congo Red Dyes from Aqueous Solutions

et al. 2023

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The main aim of this work was to use the iron−iron oxide nanochains (Fe NCs) as adsorbents of the carcinogenic cationic crystal violet (CV) and anionic Congo red (CR) dyes from water. The investigated adsorbent was prepared by a magneticfield-induced reduction reaction, and it revealed a typical core−shell structure. It was composed of an iron core covered by a thin Fe 3 O 4 shell (<4 nm). The adsorption measurements conducted with UV−vis spectroscopy revealed that 15 mg of Fe NCs constituted an efficient dose to be used in the CV and CR treatment. The highest effectiveness of CV and CR removal was found for a contact time of 90 min at pH 7 and 150 min at pH 8, respectively. Kinetic studies indicated that the adsorption followed the pseudo-first-order kinetic model. The adsorption process followed the Temkin model for both dyes taking into account the highest value of the R 2 coefficient, whereas in the case of CR, the Redlich−Peterson model could be also considered. The maximal adsorption capacity estimated from the Langmuir isotherms for the CV and CR was 778.47 and 348.46 mg g −1 , respectively. Based on the Freundlich model, both dyes adsorbed on the Fe NCs through chemisorption, but Coulombic interactions between the dye and adsorbent cannot be excluded in the case of the CV dye. The obtained results proved that the investigated Fe NCs had an excellent adsorption ability for both dye molecules within five cycles of adsorption/desorption, and therefore, they can be considered as a promising material for water purification and environmental applications.

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Section: Resultsmentioning

confidence: 99%

Iron–Iron Oxide Core–Shell Nanochains as High-Performance Adsorbents of Crystal Violet and Congo Red Dyes from Aqueous Solutions

et al. 2023

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“…The issue of this communication is that the lack of true collaboration is the major challenge to the Fe 0 remediation research community. This section illustrates this by presenting five selected recent publications on the removal of methylene blue (MB) in Fe 0 /H 2 O systems [98][99][100][101][102]. These works were published more than three years after the MB method was presented in an overview article in the Journal of Environmental Management-Elsevier [103].…”

Section: Disregarding the State-of-the-art Knowledgementioning

confidence: 99%

“…The MB method itself was first published a decade ago [104,105]. While the MB method has roots in the historical work of Mitchell et al [106] and the evidence that iron oxides are poor adsorbents for MB [35], the five referenced papers [98][99][100][101][102] used MB as a model contaminant to characterize some aspects of the Fe 0 /H 2 O system. The following section summarizes the studies, and highlights avoidable mistakes by these authors.…”

Section: Disregarding the State-of-the-art Knowledgementioning

confidence: 99%

Metallic Iron for Water Remediation: Plenty of Room for Collaboration and Convergence to Advance the Science

Xiao

Ndé-Tchoupé

et al. 2022

Water

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Scientific collaboration among various geographically scattered research groups on the broad topic of “metallic iron (Fe0) for water remediation” has evolved greatly over the past three decades. This collaboration has involved different kinds of research partners, including researchers from the same organization and domestic researchers from non-academic organizations as well as international partners. The present analysis of recent publications by some leading scientists shows that after a decade of frank collaboration in search of ways to improve the efficiency of Fe0/H2O systems, the research community has divided itself into two schools of thought since about 2007. Since then, progress in knowledge has stagnated. The first school maintains that Fe0 is a reducing agent for some relevant contaminants. The second school argues that Fe0 in-situ generates flocculants (iron hydroxides) for contaminant scavenging and reducing species (e.g., FeII, H2, and Fe3O4), but reductive transformation is not a relevant contaminant removal mechanism. The problem encountered in assessing the validity of the views of both schools arises from the quantitative dominance of the supporters of the first school, who mostly ignore the second school in their presentations. The net result is that the various derivations of the original Fe0 remediation technology may be collectively flawed by the same mistake. While recognizing that the whole research community strives for the success of a very promising but unestablished technology, annual review articles are suggested as an ingredient for successful collaboration.

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“…The values of the coe cient of determination (R 2 ) and standard error of estimation (SE est ) obtained with the tting of adsorption data to different kinetic models are presented in Table1.It is clearly evident from the values that the adsorption kinetics of CV on to untreated-and Fe(III) treated-PNB could be best accounted by the pseudo-rst order kinetics as this model resulted in the coe cient of determination Jubair et al, 2020,Foroutan et al, 2021, Wang et al, 2021 have reported the suitability of pseudosecond order kinetics for adsorption of CV onto different bio-adsorbents. However, we noted the superiority of pseudo-rst order model over the pseudo-second order model to account the adsorption kinetics of CV adsorption onto different PNB preparations.Table1.…”

mentioning

confidence: 94%

“…Many plant-based wastes materials (Loulidi et al, 2020;Elsherif et al 2021., Homagai et al, 2022Imran et al, 2022) and chemically treated leaf powder (Al-shehri et al, 2021) have been tried for the removal CV dye from waters. To make the adsorption process more viable and cost-effective, a range of bio-based activated carbons (biochars) are synthesized from agricultural wastes (Mishra et al, 2021).Biochar is a carbon-rich solid product formed during pyrolysis from thermo chemically decomposed biomass at a predetermined temperature of around 400-500°C in the absence or limited supply of oxygen (Mohan et al, 2014).It contains functional groups like carboxyl, hydroxyl, and phenolic on its surface and possesses a high speci c surface area (Jung et al, 2013) and surface reactivity to result in enhanced adsorption capacity.Plant based biochars (Wathukarage et al, 2019;Khan et al, 2021), magnetic biochar Foroutan et al, 2021) and modi cations of activated carbon (Wang et al, 2021) have been evaluated for the scavenging CV from wastewaters. In the present investigation, we used pine needles biochar(PNB) produced by pyrolysis at 450°Cwhich is chemically stable as well as insolubleand also Fe(III) treated PNB which is directly used as an adsorbent for CV dye.This study reports the performance of Fe (III) treated PNB which is simple to prepare and adopt at the user's end for the effective removal ofdye contaminants.…”

Section: Introductionmentioning

confidence: 99%

Simple adsorptive removal of crystal violet, a triarylmethane dye, from synthetic wastewater using Fe (III)-treated pine needle biochar

Joshi

Srivastava

Bhatt

et al. 2023

Environ Monit Assess

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Untreated and Fe (III) treated, cost effective pine needle biochar (PNB) wereevaluatedat different pH forremoval of toxic crystal violet (CV) dye from synthetic wastewaters. Adsorption kinetics followed pseudo-rst order kineticsinvolving intra-particle diffusion process. Theadsorption rate constant increased with Fe-treatment of PNB especially at pH 7.0.Adsorption data of CV tted well to Freundlich adsorption isotherms and both adsorption capacity(ln K) and order of adsorption (1/n) of CV nearly doubled with Fe (III)treatment of PNB at pH 7.0. Desorption of adsorbed CV from both untreatedand Fe(III) treatedPNB could be eplained satisfactorily by third degree polynomial equations. Increase in ionic strength and rise in temperature enhanced dye adsorption onto untreated and Fe(III)treated PNB.Adsorption of CV was an endothermic spontaneous reaction with the increase in entropy of the system. FTIR spectra revealed that C = O of carboxylic acid aryls,C = O and C-O-C inlignin residues of PNB reacted with Fe (III)besides the formation of some iron oxyhydroxide minerals.The changes in FTIR con rmed the possible bonding of positively charged moiety of CV onto untreated and Fe treatedPNB. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) revealed the porous surfaces of PNB with the clear accumulation of Fe (III) after treatment and deposition of CV dye on surfaces and pores of PNB. Iron (III) treatedPNBat pH 7.0 can serve as anecofriendly adsorbent for e cient removal of CV dye from wastewaters.

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Removal Study of Crystal Violet and Methylene Blue From Aqueous Solution by Activated Carbon Embedded Zero-Valent Iron: Effect of Reduction Methods

Cited by 11 publications

References 47 publications

Iron–Iron Oxide Core–Shell Nanochains as High-Performance Adsorbents of Crystal Violet and Congo Red Dyes from Aqueous Solutions

Iron–Iron Oxide Core–Shell Nanochains as High-Performance Adsorbents of Crystal Violet and Congo Red Dyes from Aqueous Solutions

Metallic Iron for Water Remediation: Plenty of Room for Collaboration and Convergence to Advance the Science

Simple adsorptive removal of crystal violet, a triarylmethane dye, from synthetic wastewater using Fe (III)-treated pine needle biochar

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