Calcium hydroxyapatite microfibrillated cellulose composite as a potential adsorbent for the removal of Cr(VI) from aqueous solution

Hokkanen, Sanna; Bhatnagar, Amit; Repo, Eveliina; Lou, Song; Sillanpää, Mika

doi:10.1016/j.cej.2015.07.035

Cited by 234 publications

(95 citation statements)

References 31 publications

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“…Sips isotherm or Langmuir‐Freundlich isotherm model is considered as a combination of the Langmuir and Freundlich models and describes heterogeneous surface of adsorbent much better than these two . This isotherm model is written as follow:

q = q_{m} \frac{{italicbP}^{\frac{1}{n}}}{1 + {bP}^{\frac{1}{n}}}

where q m , n, and b were previously described.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of nitrogen doped activated carbon/polyaniline material for CO₂ adsorption

Peyravi

2017

Polymers for Advanced Techs

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q = q_{m} \frac{{italicbP}^{\frac{1}{n}}}{1 + {bP}^{\frac{1}{n}}}

where q m , n, and b were previously described.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of nitrogen doped activated carbon/polyaniline material for CO₂ adsorption

Peyravi

2017

Polymers for Advanced Techs

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“…Over recent years, hydroxyapatite (HA) and its composites have been extensively studied for its applications in removing heavy metal ions such as Pb 2+ , Hg 2+ , Cd 2+ and ampicillin in wastewater treatment [3,4,5]. Because of its excellent adsorption effect, HA has been used to remove metal ions and organic compounds from industrial wastewater.…”

Section: Introductionmentioning

confidence: 99%

Removal of Carmine from Aqueous Solution by Carbonated Hydroxyapatite Nanorods

2017

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In this study, carbonated hydroxyapatite (CHA) nanorods were prepared by a novel hydrothermal method. The crystallinity and chemical structure of synthesized CHA nanorods was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS), respectively. Carmine was selected as representative organic dyes to study the adsorption capacities of CHA nanorods. Mechanistic studies of carmine adsorption by CHA nanorods show that the adsorption processes both follow the pseudo-second-order kinetic model and fit the Langmuir isotherm model well. The CHA nanorods exhibited a high adsorption capacity of 85.51 mg/g for carmine at room-temperature. The experimental results prove that CHA nanorods can be promising absorbents for removing organic dye pollutants in wastewater from paper and textile plants.

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“…[3] Cr(III) is less toxic, relatively insoluble in aqueous systems, and is an essential micronutrient for normal glucose metabolism at low concentrations. [4] In contrast, Hexavalent chromium, Cr(VI) usually occurs as highly soluble and highly toxic chromate anions (CrO 4 2-or or Cr 2 O 7…”

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confidence: 97%

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe³⁺ impregnated biochar

Hong

Tian

Jiang

et al. 2016

Journal of Dispersion Science and Technology

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Biochar (BC) has been widely used as a low-cost adsorbent for the removal of contaminants from water and soil. However, the adsorption ability of BC towards heavy metal oxyanions (e.g. Cr(VI)) is relatively low due to the negatively charged surface of BC.In this study, pristine BC was impregnated with Fe 3+ to improve its Cr(VI) adsorption capability. Fe 3+ -impregnated BC (Fe 3+ -BC) was successfully synthesized by a simple impregnation method and used for the removal of Cr(VI) from aqueous solution. Various factors affecting the adsorption such as impregnation ratio, pH, adsorbent dosage, contact time, temperature, and the presence of humic acid were investigated in detail. Results showed that Fe 3+ -BC had strong adsorption ability to Cr(VI) with a maximum adsorption capacity of 197.80 mg/g, which were not only significantly higher than that of the pristine Journal of Dispersion Science and Technology 2 BC, but also were superior to many previously reported adsorbents. It was favorable for Cr(VI) adsorption under the condition of acidic and high temperature. The adsorption data obeyed Sips and Langmuir isotherms and the kinetic data were well described by the pseudo-first-order kinetic model. The results herein revealed that the Fe 3+ -impregnated BC had a good potential as a highly efficient material for adsorption of Cr(VI) from aqueous solution. GRAPHICAL ABSTRACT

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Calcium hydroxyapatite microfibrillated cellulose composite as a potential adsorbent for the removal of Cr(VI) from aqueous solution

Cited by 234 publications

References 31 publications

Synthesis of nitrogen doped activated carbon/polyaniline material for CO₂ adsorption

Synthesis of nitrogen doped activated carbon/polyaniline material for CO₂ adsorption

Removal of Carmine from Aqueous Solution by Carbonated Hydroxyapatite Nanorods

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe³⁺ impregnated biochar

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Calcium hydroxyapatite microfibrillated cellulose composite as a potential adsorbent for the removal of Cr(VI) from aqueous solution

Cited by 234 publications

References 31 publications

Synthesis of nitrogen doped activated carbon/polyaniline material for CO2 adsorption

Synthesis of nitrogen doped activated carbon/polyaniline material for CO2 adsorption

Removal of Carmine from Aqueous Solution by Carbonated Hydroxyapatite Nanorods

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe3+ impregnated biochar

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Product

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Synthesis of nitrogen doped activated carbon/polyaniline material for CO₂ adsorption

Synthesis of nitrogen doped activated carbon/polyaniline material for CO₂ adsorption

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe³⁺ impregnated biochar