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Dive into the research topics where Giselle Santiago Cabral Raulino is active.

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Featured researches published by Giselle Santiago Cabral Raulino.


Journal of Environmental Management | 2012

BTEX removal from aqueous solutions by HDTMA-modified Y zeolite.

Carla B. Vidal; Giselle Santiago Cabral Raulino; Allen L. Barros; Ari Clecius Alves de Lima; Jefferson Pereira Ribeiro; Marçal Pires; Ronaldo Ferreira do Nascimento

Various technologies have been used for the treatment and remediation of areas contaminated by BTEX (benzene, toluene, ethylbenzene and xylenes), which are organic compounds that are of particular concern due to their toxicity. Potential applications of synthetic zeolites for environmental fieldwork have also been reported worldwide. In this work, a hexadecyltrimethyl ammonium (HDTMA) surfactant-modified synthetic zeolite was investigated for its efficiency in removing BTEX from aqueous solutions. Three surfactant-modified zeolites were synthesized, with amounts of surfactant corresponding to 50%, 100%, and 200% of the total cation-exchange capacity (CEC) of the synthetic zeolite Y. The results of the BTEX adsorption experiments onto both synthetic zeolite and surfactant-modified zeolites (SMZ) showed that the SMZ-100 (zeolite modified with surfactant levels at 100% of CEC) was the most efficient modified zeolite for BTEX removal. Kinetics studies indicated that the multicomponent adsorption equilibrium was reached within 6 h and followed pseudo-second-order kinetics. The Langmuir, Freundlich, Redlich-Peterson and Temkin models were used to evaluate the BTEX adsorption capacity by SMZ-100. The Temkin model was found to be suitable for all BTEX compounds in a multicomponent system. Regeneration cycles of the modified zeolite were also performed, and the results showed that the adsorbent could be used efficiently in as many as four adsorption cycles, except for benzene.


Environmental Technology | 2014

Treatment influence on green coconut shells for removal of metal ions: pilot-scale fixed-bed column

Giselle Santiago Cabral Raulino; Carla B. Vidal; Ari Clecius Alves de Lima; Diego de Quadros Melo; Juliene Tomé Oliveira; Ronaldo Ferreira do Nascimento

This work investigates copper, nickel and zinc ion biosorption in single- and multi-component systems in a fixed-bed column using green coconut shells (CS). Approximately 85% of biosorbents are in a particle size ranging from 0.25 to 2 mm. Operational parameters selected include a flow rate of 200 mL min−1 and a bed height of 100 cm, which were selected for a shorter execution time and good adsorption capacity. Empty-bed contact time and Thomas models were applied, showing a good fit with the experimental data. The column adsorption capacity increased after the green CS powder was treated in a column with NaOH at a concentration of 0.1 mol L−1. The highest values of adsorption capacities founded were 0.69, 0.45 and 0.39 mmol L−1 for Cu(II), Ni(II) and Zn(II), respectively, using green CS treated inside a column with NaOH of 0.1 M. The pH and chemical oxygen demand were monitored in the treatment solution and indicated that the adjustment of these parameters is necessary before disposal of these solutions. A study of desorption using an acid solution was carried out for recovery of metal ions.


Environmental Technology | 2016

Biosorption of metal ions using a low cost modified adsorbent (Mauritia flexuosa): experimental design and mathematical modeling

Diego de Quadros Melo; Carla B. Vidal; Thiago C. Medeiros; Giselle Santiago Cabral Raulino; Adriana Dervanoski; Márcio do Carmo Pinheiro; Ronaldo Ferreira do Nascimento

ABSTRACT Buriti fibers were subjected to an alkaline pre-treatment and tested as an adsorbent to investigate the adsorption of copper, cadmium, lead and nickel in mono- and multi-element aqueous solutions, the results showed an increase in the adsorption capacity compared to the unmodified Buriti fiber. The effects of pH, adsorbent mass, agitation rate and initial metal ions concentration on the efficiency of the adsorption process were studied using a fractional 24−1 factorial design, and the results showed that all four parameters influenced metal adsorption differently. Fourier transform infrared spectrometry and X-ray fluorescence analysis were used to identify the groups that participated in the adsorption process and suggest its mechanisms and they indicated the probable mechanisms involved in the adsorption process are mainly ion exchange. Kinetic and thermodynamic equilibrium parameters were determined. The adsorption kinetics were adjusted to the homogeneous diffusion model. The adsorption equilibrium was reached in 30 min for Cu2+ and Pb2+, 20 min for Ni2+ and instantaneously for Cd2+. The results showed a significant difference was found in the competitiveness for the adsorption sites. A mathematical model was used to simulate the breakthrough curves in multi-element column adsorption considering the influences of external mass transfer and intraparticle diffusion resistance.


Desalination and Water Treatment | 2015

Polymeric and silica sorbents on endocrine disruptors determination

Carla B. Vidal; Alexandra de Vasconcelos Feitosa; Germana Paiva Pessoa; Giselle Santiago Cabral Raulino; André Gadelha de Oliveira; André Bezerra dos Santos; Ronaldo Ferreira do Nascimento

ABSTRACTEndocrine disrupting determination at low concentration levels comprises one of the most important targets in environmental analytical chemistry. In spite of inherent high sensitivities obtained for HPLC, these techniques have some limitations depending on the contaminants. As a result, interest in preconcentration using solid–phase extraction (SPE) still continues increasingly for endocrine disrupting determinations by HPLC due to the high accuracy of this method. In this work, we evaluated three different adsorbents in preconcentration of endocrine disruptors in three different categories: pharmaceuticals (sulphamethoxazole, trimethoprim and diclofenac), hormones (estrone, 17β-estradiolacetate and 17β-estradiol) and plastic materials (bisphenol A) in multicomponent aqueous solution using the combination SPE -HPLC. The adsorbents investigated were such as modified silica (octadecylsilane)—DSC-18 (Supelco) and two polymers, a divinylbenzene-N-vinilpirolidona—Oasis® HLB (Waters) and a styrene-divin...


Desalination and Water Treatment | 2016

Multielement adsorption of metal ions using Tururi fibers (Manicaria Saccifera): experiments, mathematical modeling and numerical simulation

Carla B. Vidal; Diego de Quadros Melo; Giselle Santiago Cabral Raulino; Adriana Dervanoski da Luz; Cleuzir da Luz; Ronaldo Ferreira do Nascimento

AbstractA numerical and experimental study of the multielement adsorption of Cd2+, Cu2+, Ni2+, and Pb2+ metal ions in batch and column system were carried out in aqueous solution using Tururi fibers as adsorbent. The kinetics and thermodynamic equilibrium parameters were studied. The adsorption kinetics was fitted to the homogeneous diffusion model and the results showed good linear correlation coefficients. Furthermore, a mathematical model was built to describe the mass transfer kinetics for fixed bed column tests. The effects of constant adsorption equilibrium, external mass transfer, and intraparticle diffusion resistance on breakthrough curves were studied. The equations which describe the phenomenology were discretized using the finite volumes method with the weight upstream differencing scheme and central difference scheme formulations. The results for the breakthrough curves obtained through simulation showed good agreement compared with the experimental data.


Journal of Chemical & Engineering Data | 2013

Adsorption Equilibria of Cu2+, Zn2+, and Cd2+ on EDTA-Functionalized Silica Spheres

Diego de Quadros Melo; Vicente de Oliveira Sousa Neto; Juliene Tomé Oliveira; Allen L. Barros; Elis Cristina Chagas Gomes; Giselle Santiago Cabral Raulino; Elisane Longuinotti; Ronaldo Ferreira do Nascimento


Journal of Applied Polymer Science | 2016

Chemical modifications of lignocellulosic materials and their application for removal of cations and anions from aqueous solutions

Diego de Quadros Melo; Vicente de Oliveira Sousa Neto; Francisco Cláudio de Freitas Barros; Giselle Santiago Cabral Raulino; Carla B. Vidal; Ronaldo Ferreira do Nascimento


Journal of Applied Polymer Science | 2014

Removal of Cd2+, Cu2+, Ni2+, and Pb2+ ions from aqueous solutions using tururi fibers as an adsorbent

Diego de Quadros Melo; Carla B. Vidal; André Leandro da Silva; Raimundo Nonato Pereira Teixeira; Giselle Santiago Cabral Raulino; Thiago C. Medeiros; P. B. A. Fechine; Selma Elaine Mazzeto; Denis De Keukeleire; Ronaldo Ferreira do Nascimento


Journal of Chemical & Engineering Data | 2014

Experimental and Theoretical Approach to Multicomponent Adsorption of Selected Aromatics on Hydrophobically Modified Zeolite

Carla B. Vidal; Giselle Santiago Cabral Raulino; Adriana Dervanoski da Luz; Cleuzir da Luz; Ronaldo Ferreira do Nascimento; Denis De Keukeleire


Archive | 2014

Adsorção: aspectos teóricos e aplicações ambientais

Carla B. Vidal; Ari Clecius Alves de Lima; Ronaldo Ferreira do Nascimento; Giselle Santiago Cabral Raulino; Diego de Quadros Melo

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Carla B. Vidal

Federal University of Ceará

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Cleuzir da Luz

Universidade do Estado de Santa Catarina

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Germana Paiva Pessoa

Federal University of Ceará

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Adriana Dervanoski da Luz

Universidade do Estado de Santa Catarina

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