Removal of chromate from water by a new CTAB–silica gelatin composite

Venditti, Francesco; Ceglie, Andrea; Palazzo, Gerardo; Colafemmina, Giuseppe; Lopez, Francesco

doi:10.1016/j.jcis.2007.02.019

Cited by 62 publications

(72 citation statements)

References 28 publications

(29 reference statements)

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“…A plenty of relevant research works have been carried out very recently [1][2][3][4][5][6][7] emphasizing a great environmental concern about this issue. Chromium exists in two oxidation states as Cr(III) and Cr(VI).…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fixed-bed Column for Cr(VI) Removal from Aqueous Solution Using Schwertmannite

et al. 2008

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The fine particles of schwertmannite as an iron oxyhydroxide adsorbent has been suggested as a novel and strong Cr(VI) sorbent for treatment of Cr-contaminated industrial wastewater. The removal process was conducted in both batch and continuous trials. As a result of the batch experiments, the maximal adsorption capacity of the schwertmannite was obtained as 178 mg/g which was quite high amount in comparison with the usual applied Cr(VI) sorbents in the literatures. The continuous removal process involved a combination of a fixed bed column with a high gradient magnetic field which was firstly introduced as a novel designation of a fixed bed column to overcome the difficulties accompanied with the application of some especial fine particle adsorbents through the fixed-beds. The experimental results revealed that the magnetization force had a great function in this process to control the shape and the fitness of the bed during the sorption test as well as to simplify the experimental set-up.KEY WORDS: magnetic fixed bed column; Cr removal; high magnetic field; schwertmannite; wastewater treatment; electromagnetic processing of materials.tion, however, has some inherent limitations to be utilized as a continuous filtering system because of time-dependent plugging and saturation of its matrix.The most optimal configuration for continuous-flow sorption is the packed-bed column which gets gradually saturated from the feed to the solution exit end. High-quality fixed-bed column hardware is the subject of several US patents. In our study work, the experimental trials of the process have been conducted for many times by directly packing the column with the fine particle size of schwertmannite as the most strong Cr adsorbents. Extremely fine particles and mud like properties of the adsorbent, however, has caused a verity of problems to the system such as high pressure drop, mass transfer resistance and so on. To solve the problems dealing with the system, a magnetic fixed-bed column, as a novel designation of the fixed-bed columns, has been presented in this study. Moreover, the batch Cr(VI) adsorption data containing equilibrium models using the schwertmannite adsorbent and also the effect of pH on the adsorption to predict the sorption characteristics of the adsorbent have been given. Materials and MethodsAll chemicals used were of high purity and analytical grades. The schwertmannite powder as the chemical adsorbent of Cr(VI) in these experiments was made by homogenous hydrolysis of iron ferric salt (Fe 2 (SO 4 ) 3 · nH 2 O) according to the methods mentioned in our pervious work. 14)Stock solution of 130 mg/L of Cr(VI) for use in the fixed column experiment was prepared by dissolving of a known amount of K 2 Cr 2 O 7 in dionized water. In the batch mode adsorption trials, 50 mL of the solution with desired concentrations of Cr and the adsorbent were mixed in a bottle of 100 mL and shaken for about 5 h to reach to the equilibrium state. Then the yielded solution was filtered through a paper filter and then chromium c...

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Section: Introductionmentioning

confidence: 99%

Magnetic Fixed-bed Column for Cr(VI) Removal from Aqueous Solution Using Schwertmannite

et al. 2008

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“…Adsorption is an alternative technology because of its high effect, low cost and easy operation among the physicochemical treatment processes. Recently numerous alternative materials as adsorbents, which are good adsorbents and inexpensive, have increased much concern in sorption of heavy metals from wastewater including activated carbon [6] , activated slag [7] , iron oxide coated sand [8] , bagasse fly ash [9] , carbon nanotubes [10] , natural silicate minerals [11] , natural zeolites [12] , agricultural wastes [13] , microbial and plant derived biomass [14] , lignite [15] , wood sawdust [16] ， chitin and chitosan [17] . However, these materials are limited due to low efficiency, high cost or other shortage for practical application.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Adsorption Mechanism of Pb (II) Removal by Insolubilized Humic Acid in Polluted Water

Ma¹,

Wei

Zhao³

et al. 2014

IJEPP

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Abstract:The removal of Pb 2+ in the aqueous solutions by adsorption onto insolubilized humic acid (IHA) is investigated. The equilibrium isotherms were determined at pH 3.5 under constant ionic strength and at different temperatures. At the same time, the paper has also analyzed the adsorption experimental data by using three different isotherm models: Langmuir, Frendlich and Linear isotherm. As the result, it has obtained the optimal correlation for Frendlich isotherm equations. In addition, the paper has calculated the thermodynamic quantities ∆H in accordance with the Clausius-Claperyon , s theory. It means that the type of adsorption of Pb 2+ onto IHA is physisorption, rather than by chemical bonding. And finally, the adsorption equilibrium gained around 12 hours and a high and stable removal of heavy metals on insoluble humic acid has been obtained almost under the neutral conditions.

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“…Estas industrias producen efluentes que contienen gran cantidad de cromo en diversas formas de Cr(III) y Cr(VI) [36][37][38][39][40].…”

Section: Fuentes De Contaminación Por Cromounclassified

“…Finalmente, el lodo tiene que ser desecado y dispuesto correctamente. Sin embargo, este método es solamente eficaz para altas concentraciones de cromo y también tiene varias desventajas tales como una producción significativa de lodo, un coste cada vez mayor y lo más importante, las posibles consecuencias ambientales a largo plazo [1,16,22,36,58,64,65].…”

Section: "Tratamiento De Disoluciones Que Contienen Cromo Hexavalenteunclassified

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Tratamiento de disoluciones que contienen cromo hexavalente mediante electrocoagulación con ánodos de hierro

Núñez¹,

Guadalupe²

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Son muchas las personas que de una u otra manera han contribuido a la realización de esta tesis, y a todas ellas quiero expresarles mi agradecimiento.En el plano académico, quiero agradecer al Departamento de Ingeniería Química y Nuclear, por haberme brindado la oportunidad de completar mi formación, realizando la tesis doctoral en este grupo de investigación.A mis directores de tesis, Valentín y Tere por su ayuda, ideas, consejos, comentarios, paciencia y por depositar su confianza en mí, pero sobre todo por su excepcional calidad humana.A mis compañeros del departamento de Ingeniería Química y Nuclear, por su apoyo y ayuda durante esta investigación, que con el tiempo se han convertido en amigos, gracias a todos, en especial a Virginia, Isaac y Carlos que se han convertido en parte de mi familia y han compartido conmigo los buenos y malos momentos en estos años.A mis amigos de siempre, y a los que he ido encontrando en el camino, Dulce, Edith, Itzma, Xitlali, Faby y todos los que me han hecho olvidar por un momento todas mis preocupaciones para disfrutar de su compañía y su cariño, a todos ellos, muchísimas gracias.Agradezco muy especialmente a mi familia, a mis padres Humberto y Loli, por confiar en mi, por todo el amor que me dan y por darme alas para volar, sin ustedes esto no hubiera sido posible, a mi hermana Ani por apoyarme en todo momento y estar allí para mi siempre, a mis hermanos Beto y Alex por su apoyo y consejos, a mis abuelitas Dalia y Mary por ser mujeres excepcionales y un gran ejemplo para mi, a todos gracias por estar conmigo en todo momento y por enseñarme que merece la pena esforzarse para conseguir lo que se desea.A mi esposo Germán que me ha acompañado a lo largo de este proceso, gracias por escucharme, por no permitir que desespere, por tu apoyo, tu amor incondicional y simplemente por ser parte de mi vida.

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Removal of chromate from water by a new CTAB–silica gelatin composite

Cited by 62 publications

References 28 publications

Magnetic Fixed-bed Column for Cr(VI) Removal from Aqueous Solution Using Schwertmannite

Magnetic Fixed-bed Column for Cr(VI) Removal from Aqueous Solution Using Schwertmannite

Characterization and Adsorption Mechanism of Pb (II) Removal by Insolubilized Humic Acid in Polluted Water

Tratamiento de disoluciones que contienen cromo hexavalente mediante electrocoagulación con ánodos de hierro

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