Adsorption of dyes from aqueous solutions or suspensions with clay nano-adsorbents

Liu, Peng; Jia, Xu

doi:10.1016/j.seppur.2007.07.007

Cited by 251 publications

(83 citation statements)

References 80 publications

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“…In this sense, several low-cost materials have been used as adsorbents to treat dye-containing wastewater [19][20][21][22][23] . Among them, clay minerals have been used as a potential adsorbents for this purpose 23,24 .…”

Section: Introductionmentioning

confidence: 99%

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

et al. 2017

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This study investigated the potential of Brazilian kaolin as a low-cost adsorbent for the removal of Malachite Green (MG) from colored effluents. The morphology, chemical structure and surface properties of the adsorbent were investigated by characterization techniques such as X-ray diffraction, N2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy, X-ray fluorescence spectrometry, scanning electron microscopy, thermogravimetric analysis and particle size distribution. A possible technological application of raw kaolin is the MG removal from aqueous media, which was investigated using batch adsorption experiments. The adsorption kinetics was studied using the pseudo-first order, pseudo-second order and Elovich models. The adsorption isotherms were studied using the Langmuir, Freundlich and Sips models. The Elovich model was the more adequate to represent the adsorption kinetic, while the equilibrium was well represented by the Langmuir model. The maximum adsorption capacity, at pH of 6.3 and temperature of 25ºC, was 128 mg g -1 , and this satisfactory result may be associated with some adsorbent properties. Therefore, the results revealed that raw kaolin can be utilized as a promising low-cost adsorbent to remove MG from colored effluents.

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Section: Introductionmentioning

confidence: 99%

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

et al. 2017

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“…Natural clays are studied for removal of inorganic ions [1][2][3] and organic molecules/ions from aqueous solution [4][5][6][7][8]. Natural material is a cheaper option, but most of the natural materials are less porous and have less BET (Brunauer-Emmett-Teller) surface area.…”

Section: Introductionmentioning

confidence: 99%

Removal of arsenic from synthetic and natural groundwater using acid‐activated laterite

Maiti

Basu

2010

Env Prog and Sustain Energy

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Acid-activated laterite (AAL) is used to remove arsenic from synthetic and natural groundwater. Physicochemical characteristics of AAL, such as BET (Brunauer-Emmett-Teller) surface area, pore volume, pore volume distribution, zero point of charge, and chemical composition, are studied and compared with raw laterite (RL). The BET surface area and pore volume of AAL are obtained as 45.4 6 2.7 m 2 g 21 and 0.063 6 0.007 mL g 21 , respectively. Zero point of charge of AAL is found to be 5.70 6 0.22. Arsenite and arsenate adsorption on AAL are examined under varying process parameters such as adsorbent dose, contact time, temperature, particle size, initial arsenic concentration, and competitive ions in batch mode. Arsenic adsorption capacity of AAL increases by two-to threefold compared with RL. The kinetic data fit better to pseudo-second-order model. Transport properties, such as external mass transfer coefficient and effective pore diffusivity of arsenic species, are obtained from shrinking core model fit to experimental kinetic data. Continuous fixed bed column mode adsorption of arsenic on AAL is performed. About 200 bed volume (21 L) of arsenic contaminated groundwater (total arsenic: 378 6 8.9 lg L 21 ) has been treated at a breakthrough concentration of 50 lg L 21 of arsenic by using column height of 20 cm (weight of adsorbent: 125 g).

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“…Clay are composed of the octahedral (Al 3+ , Fe 2+ , Fe 3+ , or Mg 2+ ) and tetrahedral (Si 4+ ) structures depending on the type of clay [1]. There are several classes of clays such as smectites (montmorillonite, saponite), mica (illite), kaolinite, serpentine, pylophyllite (talc), vermiculite and sepiolite [2].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2016

International Journal of Chemical and Process Engineering Resea

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A study of the characteristics of clay from El-Sheikh Fadl Village, El-Minia Contribution/ OriginalityThe paper's primary contribution is finding that the structure, chemical composition and exchangeable ion type of montmorillonite are responsible for several properties, including a large chemically active surface area. and lowcost adsorbents might be a suitable local alternative for elimination of heavy metal ions and basic dyestuffs from aqueous solutions

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Adsorption of dyes from aqueous solutions or suspensions with clay nano-adsorbents

Cited by 251 publications

References 80 publications

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

Removal of arsenic from synthetic and natural groundwater using acid‐activated laterite

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