Remoção de cromo (VI) de soluções aquosas utilizando o compósito magnético calcinado hidrotalcita-óxido de ferro: estudo cinético e de equilíbrio termodinâmico

Toledo, Thiago Vinícius; Bellato, Carlos Roberto; Pessoa, Kenia Dias; Fontes, Maurício Paulo Ferreira

doi:10.1590/s0100-40422013000300012

Cited by 23 publications

(15 citation statements)

References 19 publications

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“…The negative values of Gibbs free energy change confirm the feasibility of this process. This result suggests a spontaneous nature of the adsorption at the studied temperatures, and also potentializes the use of this adsorbent in water decontamination 15,49,50 . The negative enthalpy change indicates that the adsorption reaction was exothermic, thus, the interaction of chromium species and the membrane surface has left energy for the system 15 .…”

Section: Langmuir Modelmentioning

confidence: 53%

Nanofibrous Membranes for Low-Concentration CrVI Adsorption: Kinetic, Thermodynamic and the Influence on ZFL Cells Viability

et al. 2021

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There is a great demand to develop different techniques for the continuous removal, immobilization, and remediation of metallic ions from contaminated water. Human contamination by metallic ions could even occur by ingestion of seafood causing carcinogenic and mutagenic activities. In this study, a nanofibrous membrane of poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) produced by electrospinning technique and coated with polyaniline (PAni) was tested for the removal of chromium in low-concentration solutions. The viability of ZFL cells (zebrafish liver cells) was performed to evaluate the water quality enhancement after chromium adsorption. The results indicated that the nanofibrous membrane successfully adsorbed the chromium species in low-concentration ( e Q = 2.44 mg/g, at pH 4.5, room temperature (RT) and 24h) by Freundlich model and followed a pseudo-second-order kinetics model indicating a possible chemisorption in multilayers, at pH 4.5, RT and [Cr VI ] = 5.0 mg/L. At pH 2.0 (24h, RT and [Cr VI ] = 5.0 mg/L), the membrane adsorbed around 91.64% of Cr VI contaminants. The thermodynamic studies revealed that the process was spontaneous and exothermic. The cells viability demonstrated the efficiency of the membrane tested in the aquatic ecosystem protection; the viability increased 19.2% in 5.0 mg/L Cr VI solution. Thus, the results of this study shows that the nanofibrous membrane can be an alternative to remove low concentration of Cr VI from aqueous solutions.

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Section: Langmuir Modelmentioning

confidence: 53%

Nanofibrous Membranes for Low-Concentration CrVI Adsorption: Kinetic, Thermodynamic and the Influence on ZFL Cells Viability

et al. 2021

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“…Adsorpsi permukaan dan pertukaran anion dianggap sebagai proses fisikokimia yang paling efektif untuk menghilangkan oksi-anion berbahaya, seperti Arsen, dari air yang terkontaminasi bahkan dalam konsentrasi yang kecil (Toledo, Bellato, Pessoa, & Ferreira, 2013). Adsorben yang berasal dari biomassa, seperti yang berasal dari limbah pertanian merupakan salah satu adsorben alternatif yang digunakan untuk menghilangkan kandungan arsen dari air limbah (Ungureanu, Santos, Boaventura, & Botelho, 2015).…”

Section: Pendahuluanunclassified

Potensi Penggunaan Abu Terbang Cangkang Sawit sebagai Adsorben Logam Arsen dari Air Limbah Tambang

2020

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Arsenic is a dangerous compound that accumulates in nature as a result of anthropogenic activities, one of which is gold mining. Effluent originating from the remaining mining is simply abandoned even though it contains Arsenic which is above the threshold set by the Government of the Republic of Indonesia. The purpose of this study was to analyze the ability of palm shell fly ash to remove arsenic in the residual gold mining effluent. The technology applied in this study was absorption by direct mixing followed by settling and filtering. The maximum arsenic removal efficiency achieved in this study was valued at 81.98%. The longer the contact time between the palm shell fly ash and the waste sample, the less the amount of Arsenic in the waste water will be. The results of this study indicate that the method of removing arsenic from wastewater using palm shell fly ash is very effective, easy to apply and cheap in terms of the cost required.

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“…Layered double hydroxides (LDHs) or hydrotalcite-like anionic mineral clays have an octahedral structure derived from the mineral brucite (Mg(OH) 2 ) [8,9]. The general formula for ternary LDHs is [10].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

Almeida

Bellato

Mounteer

et al. 2015

Applied Surface Science

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Highlight► The catalysts composite TiO 2 /MgZnAl-5, was more efficient than TiO 2 P25.► The effects of different molar ratios zinc on the photocatalysts were investigated.► Synergistic effect between constituents of TiO 2 /MgZnAl-5 increases the photocatalysis.► TiO 2 /MgZnAl-5 exhibited the adsorption of light displacing the greater wavelength.► The catalyst composite TiO 2 /MgZnAl-5 can be reused for five consecutive cycles. AbstractPage 2 of 34 A c c e p t e d M a n u s c r i p t 2 A series of TiO 2 /MgZnAl photocatalysts, were successfully synthesized from ternary (Mg, Zn and Al) layered double hydroxides impregnated with TiO 2 nanoparticles by the co-precipitation method at variable pH with different Zn 2+ /Mg 2+ molar ratios . The composite photocatalysts were calcined at 500 °C resulting in the incorporation of oxide zinc, in the calcined MgZnAl LDH structure. Synergistic effect between ZnO and TiO 2 lead to significant enhancement of TiO 2 /MgZnAl photocatalytic activity. Composite photocatalysts were characterized by ICP-MS, N 2 adsorption/desorption, XRD, SEM, EDS, IR and UV-Vis DRS. Phenol in aqueous solution (50 mg/L) was used as a model compound for evoluation of UV-Vis (filter cutoff for λ > 300 nm) photocatalytic activity . The most efficient phocatalyst composite was obtained at a 5% Zn 2+ /Mg 2+ molar ratio , in the catalyst identified as TiO 2 /MgZnAl-5. This composite catalyst had high photocatalytic activity, completely destroying phenol and removing 80% of total organic carbon in solution after 360 min.The TiO 2 /MgZnAl-5 catalyst remained relatively stable, presenting a 15% decrease in phenol degradation efficiency after five consecutive photocatalytic cycles.

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Remoção de cromo (VI) de soluções aquosas utilizando o compósito magnético calcinado hidrotalcita-óxido de ferro: estudo cinético e de equilíbrio termodinâmico

Cited by 23 publications

References 19 publications

Nanofibrous Membranes for Low-Concentration CrVI Adsorption: Kinetic, Thermodynamic and the Influence on ZFL Cells Viability

Nanofibrous Membranes for Low-Concentration CrVI Adsorption: Kinetic, Thermodynamic and the Influence on ZFL Cells Viability

Potensi Penggunaan Abu Terbang Cangkang Sawit sebagai Adsorben Logam Arsen dari Air Limbah Tambang

Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

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