Adsorption of tannic acid on chitosan-montmorillonite as a function of pH and surface charge properties

An, Jong-Hyok; Dultz, Stefan

doi:10.1016/j.clay.2006.11.001

Cited by 206 publications

(95 citation statements)

References 15 publications

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“…What makes things even worse is that most of traditional Chinese medicines are derived from tanninscontained plants, which would be toxic for human when given by intravenous injection. Meanwhile, tannins in the surface and ground water is toxic to aquatic organism (An and Dultz 2007). Therefore, it is important to remove the tannins from traditional Chinese medicine and some kinds of foods.…”

Section: Introductionmentioning

confidence: 99%

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Modification of fish skin collagen film and absorption property of tannic acid

et al. 2011

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Fish collagen is a biomacromolecule material and is usually used as a clarifying agent. However, fish collagen is not recyclable, and sedimentation usually occurs in the clarification process using fish collagen so that the filtration process is inevitable. This work aimed to provide a recyclable modified fish skin collagen film (MFCF) for adsorption of tannic acids. The collagen from channel catfish skin was extracted and used for preparation of the fish skin collagen film (FCF) and MFCF. The result indicated that the mechanical properties of MFCF were improved by addition of 2 ml/L glycerol, 6 ml/L polyvinyl alcohol (PVA) and 2 ml/L glutaraldehyde in 15 g/L collagen solution. As the most important property of adsorption material, the hydroscopicity of MFCF was only 54%, significantly lower than that of FCF (295%). Therefore, MFCF would not collapse in water. The infrared and thermal properties of MFCF were also investigated in this work. Results indicated that, in comparison to FCF, the physical and chemical properties of MFCF had been improved significantly. MFCF had higher shrink temperature (79.3°C) and it did not collapse in distilled water at normal temperature. Furthermore, absorption and desorption properties of tannic acid were studied. MFCF showed good capability of absorption and desorption of tannic acid, which leaded to the suggestion that MFCF could have potential applications in adsorption material.

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Section: Introductionmentioning

confidence: 99%

“…Although some materials have been used to remove tannine in waste streams in chemical process industries or in natural waters (Chang and Juang 2005;An and Dultz 2007), collagen is still an appropriate material to clarify the tannine in foods and some traditional Chinese medicine for safety.…”

Section: Introductionmentioning

confidence: 99%

Modification of fish skin collagen film and absorption property of tannic acid

et al. 2011

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“…For instance, protonated amino groups in a chitosan-montmorillonite nanocomposite acted as anion-adsorption sites, showing preferential adsorption of the inorganic anions Cr(VI) and As(V) 187 or organic pollutants such as tannic acid. 188 The influence of pH in this material was very strong and the adsorption ability was reduced at extreme pH values.…”

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confidence: 98%

Hybrid and biohybrid silicate based materials: molecular vs. block-assembling bottom–up processes

2011

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“…Montmorillonite (MMT), the main component of bentonite, is a layered aluminosilicate mineral that belongs to the montmorillonite/smectite group of clay minerals. Chitosan/ montmorillonite composite prepared by different approaches has successfully employed to adsorb dye 30 , Cobalt (II) 31 , Copper (II) 32 , and tannic acid 33 . However, there have been few reports for using chitosan/montmorillonite composite as an adsorbent to remove silver ion from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Silver (I) From Aqueous Solution Using Chitosan/Montmorillonite Composite Beads

Jintakosol

Nitayaphat

2016

Mat. Res.

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Chitosan/montmorillonite (CTS-MMT) composite beads were used as adsorbents for the removal of silver ion (Ag + ) from aqueous solution. Equilibrium adsorption was achieved within 150 min at 3% MMT of chitosan solution. The optimum pH value for Ag + removal was found to be 6-7. The maximum adsorbent dosage for Ag + removal was 5 g/L. Under above maximum conditions the Ag + removal was 95.7%. The maximum adsorption capacities of CTS and CTS-MMT composite beads as obtained from Langmuir isotherm were found to be 38.46 and 43.48 mg/g, respectively. The adsorption kinetic agrees well with the pseudo second order model. The Ag + desorption of CTS-MMT composite bead was 17.39% at pH=4. SEM/EDX images confirm that after adsorption the Ag + were dispersed onto the composite bead surface. The adsorption and desorption experiment demonstrated that the CTS-MMT composite beads can be used as an effective adsorbents for removal of Ag + from aqueous solution.

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Adsorption of tannic acid on chitosan-montmorillonite as a function of pH and surface charge properties

Cited by 206 publications

References 15 publications

Modification of fish skin collagen film and absorption property of tannic acid

Modification of fish skin collagen film and absorption property of tannic acid

Hybrid and biohybrid silicate based materials: molecular vs. block-assembling bottom–up processes

Adsorption of Silver (I) From Aqueous Solution Using Chitosan/Montmorillonite Composite Beads

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