Adsorption behavior of orange waste gel for some rare earth ions and its application to the removal of fluoride from water

Paudyal, Hari; Pangeni, Bimala; Ghimire, Kedar Nath; Inoue, Katsutoshi; Ohto, Keisuke; Kawakita, Hidetaka; Alam, Shafiq

doi:10.1016/j.cej.2012.04.061

Cited by 85 publications

(31 citation statements)

References 42 publications

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“…Furthermore, pectin mainly consists of α(1‐4)‐linked D‐galacturonic acid, and this carboxy group can strongly interact with the metal ions, such as heavy metal and alkaline earth metal ions . These properties, such as a strong interaction with metal ions, have been used as the ion‐exchange and removal materials of metal ions . However, as the pectin does not have a mechanical strength, the pectin‐containing material cannot be used for a long time under environmental and practical conditions.…”

Section: Introductionmentioning

confidence: 99%

Preparation of pectin‐inorganic composite material as accumulative material of metal ions

Yamada

Shiiba

2015

J of Applied Polymer Sci

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Pectin is one of the biopolymers in the cell walls of all plant tissues, but the pectin-containing materials have been discarded as industrial waste in food-processing factories. We prepared a water-insoluble pectin-inorganic composite material by mixing pectin and a silane coupling reagent, bis(3-trimethoxysilylpropyl)amine. The mechanical strength of the pectin-inorganic composite material was higher than that of the pectin material without the addition of an inorganic component. In addition, the thermal stability of the composite material increased with the addition of the inorganic component. Furthermore, when the pectin-inorganic composite materials were incubated in an aqueous solution of Cu(II), Zn(II), or In(III), these composite materials effectively accumulated not only the heavy metal ions, but also rare-earth metal ions. Additionally, based on the infrared (IR) measurements, the metal ion accumulative mechanism into the composite material is described. As a result, the IR spectra suggested an electrostatic interaction between the metal ion and carboxy group in the pectin.

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Section: Introductionmentioning

confidence: 99%

Preparation of pectin‐inorganic composite material as accumulative material of metal ions

Yamada

Shiiba

2015

J of Applied Polymer Sci

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“…1,2 Additionally, the pectin-containing materials have been discarded as industrial waste, such as the secondary product of fruit juice or sunflower oil, in a food-processing factory. 3 Therefore, pectin is inexpensive and can be used as a functional polysaccharide material, such as an absorbent of metal ions, 4,5 drug delivery system, 6,7 and biodegradable hydrogel. 8 Additionally, since pectin has many functional groups, such as a carboxyl group, pectin can immobilize various molecules in these groups.…”

Section: Introductionmentioning

confidence: 99%

Anhydrous proton conductor consisting of pectin–inorganic composite material

Yamada

Ogino

2015

J of Applied Polymer Sci

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An organic-inorganic proton conductive composite material consisting of a biopolymer was prepared by mixing the pectin, tetraethyl titanate, and imidazole. Although the pectin material without the composite dissolved in water, the pectin-inorganic composite material did not show water solubility. In addition, in the composite material, the pectin and imidazole formed an acidbase structure by an electrostatic interaction, and as a result, these composite materials showed a thermal stability at intermediate temperatures (100-2008C). Furthermore, these composite materials indicated the proton conductivity of 5.6 3 10 24 S cm 21 at 1808Cunder anhydrous conditions. The activation energy of the proton conduction under anhydrous conditions was 0.32-0.22 eV and these values were one order of magnitude higher than that of the typical humidified perfluorinated membrane, such as Nafion V R . The organic-inorganic composite material consisting of a biocomponent may have the potential to be utilized as a novel proton conductor under anhydrous conditions.

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“…2 d), which increased the specific surface area of adsorbents and the adsorption capacity on fluoride ion [27]. As shown in Fig.3, the energy dispersive X-ray (EDX) analysis spectrum of MCLRB after fluoride ion adsorption, there was an obvious content of fluoride ion in the EDX spectrum after fluoride adsorption, which illustrated MCLRB was an efficient adsorbent for fluoride ion adsorption [28]. The surface area and average pore diameter for MCLB and MCLRB were shown in Table 1.…”

Section: Accepted Manuscriptmentioning

confidence: 82%

Comparison of La3+ and mixed rare earths-loaded magnetic chitosan beads for fluoride adsorption

Peng

et al. 2018

International Journal of Biological Macromolecules

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La and mixed-rare earth magnetic chitosan beads (MCLB and MCLRB) were successfully prepared for fluoride removal, respectively. The adsorbents were characterized by scanning electron microscope and magnetic response. Batch experiments were carried out to investigate the adsorbent performance based on the influence of various factors such as adsorbent dosage, contact time, initial solution pH and co-existing anions on the fluoride adsorption. Results showed that MCLB and MCLRB followed the pseudo-second-order kinetic model with the correlation coefficient value of 0.9925 and 0.9985 respectively. The adsorption process was mainly chemical adsorption. The isotherm data was well fitted both Langmuir model and Freundlich model. The adsorption capacity of the adsorbents were 20.53 and 22.35mg/g respectively. The optimum pH value for fluoride ion removal was 5.0. The effects of co-existing anions on the fluoride sorption followed the decreasing order of CO>HCO>SO>NO>Cl. Fluoride adsorption on MCLB and MCLRB could be attributed to ion exchange between fluoride and OH groups with the FeO coordinate bond promotion. Our study revealed that MCLB and MCLRB performed strong adsorption capacity for fluoride ion. In particularly, MCLRB could be a more cost-effective adsorbent to remove fluoride from aqueous solution.

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Adsorption behavior of orange waste gel for some rare earth ions and its application to the removal of fluoride from water

Cited by 85 publications

References 42 publications

Preparation of pectin‐inorganic composite material as accumulative material of metal ions

Preparation of pectin‐inorganic composite material as accumulative material of metal ions

Anhydrous proton conductor consisting of pectin–inorganic composite material

Comparison of La3+ and mixed rare earths-loaded magnetic chitosan beads for fluoride adsorption

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