A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Sakti, Satya Candra Wibawa; Narita, Yasuyuki; Sasaki, Takahiro; Nuryono, Nuryono; Tanaka, Shunitz

doi:10.1016/j.jece.2015.05.004

Cited by 26 publications

(9 citation statements)

References 49 publications

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“…A novel pyridinium-diethylenetriamine magnetic chitosan (PDFMC) was prepared and used for magnetic separation of Cr(VI) from aqueous solution. The PDFMC worked well on removal of Cr(VI) in any condition of acidic, neutral, and basic solutions with the capacity ( q max ) of 176 mg/L (at pH 3, acidic), 124 mg/L (pH 6, near-neutral), and 86 mg/L (pH 9, basic) based on the Langmuir isotherm model [11]. Cellulose grafted to nanomagnetites was found to be an efficient biopolymer composite for catalysis of Friedel-Crafts reaction between isatins and indoles, leading to selective synthesis of 3-hydroxy-3- indolylindolin-2-ones [12].…”

Section: Introductionmentioning

confidence: 99%

Gd-DTPA Adsorption on Chitosan/Magnetite Nanocomposites

et al. 2016

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The synthesis of the chitosan/magnetite nanocomposites is presented. Composites were prepared by co-precipitation of iron(II) and iron(III) salts by aqueous ammonia in the 0.1 % chitosan solution. It was shown that magnetite synthesis in the chitosan medium does not affect the magnetite crystal structure. The thermal analysis data showed 4.6 % of mass concentration of chitosan in the hybrid chitosan/magnetite composite. In the concentration range of initial Gd-DTPA solution up to 0.4 mmol/L, addition of chitosan to magnetite increases the adsorption capacity and affinity to Gd-DTPA complex. The Langmuir and Freundlich adsorption models were applied to describe adsorption processes. Nanocomposites were characterized by scanning electron microscopy (SEM), differential thermal analysis (DTA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and specific surface area determination (ASAP) methods.

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Section: Introductionmentioning

confidence: 99%

Gd-DTPA Adsorption on Chitosan/Magnetite Nanocomposites

et al. 2016

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“…MP@SiO 2 showed ~6% weight loss due to desorption of physically adsorbed water and condensation of silanol groups of SiO 2 [41]. In contrast to them, MP@[Chi-SiO 2 ] and MP@[Chi-CPTMS(1/4)SiO 2 ] exhibited larger weight losses, which were 23.0 and 28.8 wt%, respectively, in the temperature between 250 and 800°C, due to combustion of organic moieties [42]. The larger weight loss for MP@[Chi-CPTMS(1/4)SiO 2 ] than that for MP@[Chi-…”

Section: Characterization Of Mp@[chi-cptms(1/4)-sio 2 ]mentioning

confidence: 98%

Chitosan-functionalized natural magnetic particle@silica modified with (3-chloropropyl)trimethoxysilane as a highly stable magnetic adsorbent for gold(III) ion

Nuryono

Miswanda

Sakti

et al. 2020

Materials Chemistry and Physics

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“…It is probably due to the presence of layer on MM surface while these silica hybrid layers have no magnetic property [6,14,21]. A lower Ms value of MM@SiO2/TB may be explained because of a higher molecular weight of TB that leads slower response of MM@SiO2/TB to the external magnetic field than that of MM@SiO2/AB.…”

Section: Magnetismmentioning

confidence: 99%

“…One of the gold separation methods as an ion, Au(III), is adsorption which has many advantages, including environmental-friendly, no hazardous waste, inexpensive, can be applied at a low concentration of metal ion [5] and the adsorbent can be used repeatedly [6]. Various types of adsorbents can be used in the process of Au(III) adsorption, such as nanoporous adsorbents [7], nanofiber membranes [8] and modified silica [5,[9][10][11].…”

Section: ■ Introductionmentioning

confidence: 99%

Coating of 2-Aminobenzimidiazole and 1-(o-Tolyl)biguanide Functionalized Silicas on Iron Sand Magnetic Material for Sorption of [AuCl<sub>4</sub>]<sup>–</sup>

et al. 2019

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Two novel materials of 2-aminobenzimidiazole (AB) and 1-(o-tolyl)biguanide (TB) modified silicas coated on the iron sand magnetic material (MM@SiO2/AB and MM@SiO2/TB) have been synthesized and were used to adsorb Au(III) from Au/Cu/Ni solution. Silica layering MM was modified with polyamino compounds via a sol-gel process using a sodium silicate solution, 3-chloropropyltrimethoxysilane (CPTS) and modifier compounds. Adsorption of Au(III) on MM@SiO2/AB and MM@SiO2/TB was investigated in a batch system by varying pH, initial concentration, contact time and the presence of other metal ions (Cu(II) and Ni(II)). The results showed that MM@SiO2/AB and MM@SiO2/TB were successfully synthesized through the sol-gel process using cross-linking agent CPTS. Adsorption of Au(III) on MM@SiO2/AB and MM@SiO2/TB decreased with the increase of pH and followed the Langmuir isotherm models with adsorption capacity of 17.15 and 9.44 mg/g, respectively. The adsorption kinetics fit to pseudo-second-order model with the rate constants of 1.16 × 10-2 and 1.46 × 10-2 g mg-1 min-1, respectively. MM@SiO2/AB and MM@SiO2/TB gave a high selectivity towards Au(III) in a mixture of Cu(II) and Ni(II). The desorption using thiourea 1 M solution in 1 M HCl of metal ions showed that percentage of Au(III) desorbed was higher than that of Cu(II) and Ni(II).

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A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Cited by 26 publications

References 49 publications

Gd-DTPA Adsorption on Chitosan/Magnetite Nanocomposites

Gd-DTPA Adsorption on Chitosan/Magnetite Nanocomposites

Chitosan-functionalized natural magnetic particle@silica modified with (3-chloropropyl)trimethoxysilane as a highly stable magnetic adsorbent for gold(III) ion

Coating of 2-Aminobenzimidiazole and 1-(o-Tolyl)biguanide Functionalized Silicas on Iron Sand Magnetic Material for Sorption of [AuCl<sub>4</sub>]<sup>–</sup>

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