Electrochemical removal of CuII in the presence of humic acid

Barbosa, Claudomiro Pinto; Malpass, Geoffroy Roger Pointer; Miwa, Douglas Waychi; Gomes, Leonardo Fernandes; Bertazzoli, Rodnei; Motheo, Artur J.

doi:10.1590/s0103-50532010000400010

Cited by 6 publications

(9 citation statements)

References 21 publications

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“…The removal efficiency (R%) and the quantity of metal ions adsorbed per gram of adsorbent was calculated using eqn (1) and (2). All experiments were carried out at 20 C except the temperature experiments.…”

Section: Adsorption Kinetics and Equilibrium Isotherm Of Metal Ions Omentioning

confidence: 99%

“…[1][2][3][4] Among these methods, adsorption is generally preferred due to its high efficiency, ease of handling and availability of different sorbents. Various methods have been developed for the heavy metals removal such as solvent extraction, membrane separation, precipitation, reduction, electrochemical treatment, adsorption, occulation, reverse osmosis and ion exchange.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of amidoxime surface-functionalized polyindole (ASFPI) nanofibers for Pb(ii) and Cd(ii) adsorption from aqueous solutions

et al. 2015

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Amidoxime surface-functionalized polyindole (ASFPI) nanofibers were prepared by electrospinning of chemically synthesized poly(5-cyanoindole) followed by surface modification. The as-prepared ASFPI nanofibers were characterized with FTIR, SEM, BET surface areas and water contact angle measurement.Meanwhile, the adsorption properties and mechanism of ASFPI nanofibers towards Pb(II) and Cd(II) in aqueous solution were mainly investigated by a batch method. It was found that ASFPI nanofibers showed a high affinity towards Pb(II) and Cd(II). The maximum adsorption capacities were found to be 307.44 and 108.49 mg g À1 for Pb(II) and Cd(II), which are markedly high values compared to other fiber adsorbents reported. The adsorption isotherms were better fitted with the Langmuir model rather thanFreundlich and Temkin models. The kinetics data analysis showed that the adsorption process could be described by a pseudo-second order kinetic model, suggesting a chemisorption process as the rate limiting step. Thermodynamic parameters revealed the spontaneity of the adsorption process and higher temperature favored adsorption. Regeneration tests showed that ASFPI nanofibers could be reused repetitively for 10 times with 80% of the initial adsorption capacity.

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Section: Adsorption Kinetics and Equilibrium Isotherm Of Metal Ions Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of amidoxime surface-functionalized polyindole (ASFPI) nanofibers for Pb(ii) and Cd(ii) adsorption from aqueous solutions

et al. 2015

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Section: Influence Of Nacl Concentration and Applied Potentialmentioning

confidence: 99%

“…Comparing with the obtained results without the membrane it can be seen that there is a decrease of 17.6% in the color removal at 1.8 V and 13% at 2.2 V. Again, it is observed that the best color removal was obtained at 2.2 V. These results indicate that the use of a membrane is capable of reducing the formation of ClO − as seen in previous papers. 41 The E EO values with and without the membrane are given in Figure 9.Total organic carbon (TOC) is a very important parameter applied to wastewater pollution analyses. 42 For the degradation of RO16 TOC removal was analyzed as function of potential applied, NaCl concentrations and use of a membrane.…”

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confidence: 99%

Electrochemical degradation of the dye reactive orange 16 using electrochemical flow-cell

Gomes¹,

Miwa²,

Malpass³

et al. 2011

J. Braz. Chem. Soc.

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As remoções eletroquímicas de cor e do conteúdo orgânico de soluções do corante laranja reativo 16 (RO16) foram efetuadas usando uma célula em fluxo e um eletrodo de trabalho de Pt. As influências das variáveis do sistema, tais como fluxo, concentração de NaCl, potencial aplicado e pH da solução, foram estudadas. A melhor remoção de cor foi de 93% (l = 493 nm) após 60 min de eletrólise potentiostática a 2,2 V vs. ERH, usando 1,00 g L -1 NaCl como eletrólito suporte. Os aumentos na concentração de NaCl e do potencial aumentam a velocidade de remoção de cor. A melhor remoção de carbono orgânico total (57%) foi obtida com a aplicação de 1,8 V, sem membrana de separação, indicando que as melhores condições para remoção de cor não são necessariamente as melhores para remover conteúdo orgânico. A eficiência de degradação diminui com a diminuição do pH da solução.Electrochemical removals of color and organic load from solutions containing the dye reactive orange 16 (RO16) were performed in an electrochemical flow-cell, using a platinum working electrode. The influence of the process variables flow-rate, such as NaCl concentration, applied potential and solution pH, were studied. The best color removal achieved was 93% (l = 493 nm) after 60 min at 2.2 V vs. RHE electrolysis, using 1.00 g L -1 NaCl as supporting electrolyte. The rises in the concentration of NaCl and applied potential increased the color removal rate. The best total organic carbon removal (57%) was obtained at 1.8 V, without the separating membrane, indicating that the ideal conditions for the color removal are not necessarily the same as those to remove the total organic carbon. The degradation efficiency decreased with the solution pH decrease.Keywords: decolorization, textile effluent, electrochemical degradation, reactive dye, Pt electrode IntroductionWhen untreated textile effluents are discharged into receiving water bodies many environmental problems can occur. The principal problems are that the presence of dyes (even at concentrations of < 1 ppm) that can cause considerable coloration in water courses, affect transparency to natural light (reducing photosynthesis), reduce gas solubility and may also present carcinogenic and mutagenic properties. 1,2Wide varieties of dyes are used in the textile industry and can be classified according to the manner in which they are fixed to the textile fiber (e.g., direct, reactive) or by their chemical structure (e.g., azo, anthraquinone). In the textile industry, reactive dyes are widely used due to their relatively easy application in the dyeing process and stability during wear. As a result of this stability, reactive dyes may require more complicated systems to achieve their removal from effluent flows. A number of methods presented in the literature are traditionally used to treat textile effluent and they are generally based on physical, chemical and biological treatments.3-5 Physical treatment methods tend to simply transfer the pollutant to a different phase and biological methods can be prolonged and ...

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“…The first is the indirect electrochemical degradation of various polluting substances using oxide electrodes (typically mixtures of RuO 2 and TiO 2 ) for the in situ generation of Cl 2 . The matrices investigated include pesticides such as atrazine [4] and carbaryl [5]; real textile waste [6,7] and Cu(II)-humic acid complexes [8]. It was noticed that significant efficiencies are obtained when in situ generated chlorine is used.…”

Section: Introductionmentioning

confidence: 99%