Adsorption of BTX (benzene, toluene, o-xylene, and p-xylene) from aqueous solutions by modified periodic mesoporous organosilica

Moura, Cícero Pessoa de; Vidal, Carla Bastos; Barros, Allen Lopes de; Costa, Luelc Souza da; Vasconcellos, L. C. G.; Dias, Francisco Santos; Nascimento, Ronaldo F.

doi:10.1016/j.jcis.2011.07.054

Cited by 79 publications

(40 citation statements)

References 32 publications

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“…Thus, the driving concentration gradient between the bulk solution and the solid surface is the main factor controlling the kinetics of the system. A similar trend of rapid initial and subsequent slower sorption was reported by many researchers [20][21][22].…”

Section: Biochar Characterizationsupporting

confidence: 87%

Biosorption behavior of Sr2+ using straw-derived biochar: equilibrium and isotherm study

Yakout

Elsherif

2016

Desalination and Water Treatment

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A B S T R A C TRice straw-derived biochars carbonize at different temperature (550, 650, 750˚C) used for Sr 2+ removal. Experimental parameters affecting the sorption process like pH, contact time, sorbent concentration, and temperature were investigated. Sorption profile showed an initial rapid uptake which decreased and became almost constant after one hour. Optimum Sr 2+ sorption was achieved at pH 6. Sorption kinetics good correlated with both pseudo-secondorder and Elovich kinetic equations. Isotherm model of Dubinin-Radushkevich provides the best correlation of Sr 2+ sorption. The present biochar shows better sorption performance (198 mg/g) of Sr 2+ than many types of sorbents. Adsorption of Sr 2+ on biochar was endothermic and increase upon solution temperature rises from 25 to 55˚C. Present investigation emphasized that the rice straw-based biochar exhibited a high potential for Sr 2+ removal from aqueous solution.

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Section: Biochar Characterizationsupporting

confidence: 87%

Biosorption behavior of Sr2+ using straw-derived biochar: equilibrium and isotherm study

Yakout

Elsherif

2016

Desalination and Water Treatment

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“…Breakthrough curves were determined as the relationship between concentration in the water sample passed through the sorbent and initial synthetic solution (C/C 0 ). For each sorbent-analyte system, the retention parameters were determined from the appropriate curve [6,18,23,24].…”

Section: Spe Experimentsmentioning

confidence: 99%

Polymeric and silica sorbents on endocrine disruptors determination

Vidal

Feitosa

Pessoa

et al. 2015

Desalination and Water Treatment

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A B S T R A C TEndocrine 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-divinylbenzene modified with butyrolactone-Strata-X™ (Phenomenex). The parameters selected to evaluate the best adsorbent were sample loaded, breakthrough volume, recovery and adsorption capacity. The results showed that the polymeric sorbents Oasis and Strata presented good separation and selective ability, then the most efficient sorbent for the described test was applied to the determination of endocrine disruptor (ED) in a wastewater real sample. Almost all endocrine disruptors studied in the present work were found and quantified in the effluent sample, suggesting the selected cartridge could be useful for preconcentration technique of endocrine disruptors in environmental analytical applications. Correlation analysis identified the adsorption parameters which had the most influence in efficiency of SPE adsorbents, such as initial ED concentration, breakthrough volume and recovery.

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“…Benzene is recognized as the most toxic member of BTEX, as it is a proven carcinogenic substance. An acute exposure by inhalation or ingestion can be lethal (Forte et al, 2007;Moura et al, 2011).…”

Section: Introductionmentioning

confidence: 99%