Cadmium sorption characteristics of phosphorylated sago starch-extraction residue

Igura, Masato; Okazaki, Masanori

doi:10.1016/j.jhazmat.2010.01.142

Cited by 20 publications

(16 citation statements)

References 40 publications

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“…The increase intensity in the 1125–985 cm −1 region in the spectra for both chemically modified celluloses is a clear indication of the presence of phosphate group in the new synthesized biopolymers. The IR spectroscopy is not an equivocal technique for this investigation to conclude about the chemical modification of cellulose structure since the typical bands of phosphates are usually most pronounced in the area of the spectrum where the pulp already has several intense bands in the 900–1200 cm −1 interval [17,18,19,20,21]. …”

Section: Resultsmentioning

confidence: 99%

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Phosphated Cellulose as an Efficient Biomaterial for Aqueous Drug Ranitidine Removal

et al. 2014

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Crystalline cellulose chemically modified through a reaction with sodium trimetaphosphate (STMP) in an acidic or basic condition yielded Cel-P4 and Cel-P10. These phosphated solids were characterized by elemental analysis, X-ray diffraction (XRD), infrared (IR) spectroscopy, scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) at the solid state for phosphorus nucleus and dispersive X-ray energy. The elemental results demonstrated that the phosphorylation reaction was more efficient in the basic medium, as supported by the amount of phosphorous content. The synthesized biomaterials decreased in crystallinity in comparison to the precursor cellulose, with an increase in roughness and present two distinct phosphorus environments in the formed structure. The phosphated cellulose in an alkaline condition was applied to sorb the drug ranitidine. This process was applied in varying pH, time, temperature and concentration. The best sorption kinetic model to fit the experimental data was the pseudo-second-order with a coefficient correlation of 0.8976, and the Langmuir isotherm model was the most adjusted to the variation in concentration. The efficient drug sorption has a low dependence on temperature, with maximum values of 85.0, 82.0 mg and 85.7 mg·g−1 for Cel-P10 at 298, 308 and 318 K, respectively. The best sorption occurred at pH = 6 with a saturation time of 210 min.

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Section: Resultsmentioning

confidence: 99%

“…It has been observed that the intensity of the main peak for both biomaterials is distinct which could be due to analysis time of each material in the instrument. Both symmetrical sidebands approximately at 80 ppm and −80 ppm resulted from the rotational anisotropy power [15,17,22]. …”

Section: Resultsmentioning

confidence: 99%

Phosphated Cellulose as an Efficient Biomaterial for Aqueous Drug Ranitidine Removal

et al. 2014

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“…Phosphorylation for sago starch‐extraction residue was carried out according to the methods of Igura and Okazaki 21. Sago starch‐extraction residue obtained from Leyte in the Philippines was used as a raw material.…”

Section: Methodsmentioning

confidence: 99%

“…Recently some of the effective use of biological waste materials; such as rice straw, bagasse cotton stalk, and wood pulp have been reported 16–18. Sago starch‐extraction residue was used for the raw material of the production of biodegradable plastics,19, 20 the heavy metal sorbent,21 and other additional uses that are desirable.…”

Section: Introductionmentioning

confidence: 99%

“…The effective sorbent with chemical modification of agricultural by‐products17, 18, 22–27 is the techniques to generate efficient, low‐cost sorbents for the removal of heavy metal from water. The sago starch‐extraction residue could be treated in some way to make it an effective sorbent,21 which could be used for removal of heavy metals in wastewater. Phosphorylation, which is an esterification reaction, can be expected to impart heavy metal sorption capacity to sago starch‐extraction residue.…”

Section: Introductionmentioning

confidence: 99%

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Selective sorption of heavy metal on phosphorylated sago starch‐extraction residue

Igura

Okazaki

2011

J of Applied Polymer Sci

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ABSTRACT:The phosphorylated sago starch-extraction residue (P-SR) was produced for the removal of heavy metal from wastewater. The phosphoric ester in the phosphorylated residue was evaluated by means of infrared microspectrometry and solid-state NMR. In this study, the phosphorus contents of produced P-SR, phosphorylated cellulose (P-C), and phosphorylated sago starch were 31.7, 34.2, and 4.6 mg/g, respectively. The phosphorus contents of P-C and sago starch were clearly different because of the difference of each structure. The maximum sorption capacities of heavy metals (cadmium, lead, copper, and zinc) in single heavy metal sorption on P-SR were 0.20, 0.25, 0.36, and 0.24 mmol/g (Cu > Pb > Zn > Cd), respectively. On the other hand, the amount of sorbed heavy metals in coexisted heavy metal sorption on P-SR followed the order of Pb > Cu > Cd > Zn that was different from the relations of maximum sorption capacities for individual heavy metals. The heavy metal sorption behavior in single and coexisted heavy metal solution for P-SR were different and P-SR showed the intrinsic heavy metal sorption affinity, called as selective sorption.

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Phosphorylated cellulose/electrospun chitosan nanofibers media for removal of heavy metals from aqueous solutions

Brandès

Brouillette

Chabot

2020

J of Applied Polymer Sci

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Contamination of water resources by toxic heavy metals has significant impacts on environmental and human health. Their removal from aqueous media is essential to ensure water sustainability and to provide safe freshwater availability to population. Electrospun chitosan (CS) nonwoven mats are efficient at removing heavy metals from aqueous media. However, they suffer from low permeability and low-mechanical strength. They are also unable to remove contaminants in a nonselective way. A bilayer sorbent media made of a porous phosphorylated cellulose substrate covered by electrospun CS nanofibers was developed to overcome those weaknesses. The hydrophilic composite shows good water permeability and mechanical strength with appropriate thermal and chemical characteristics. Adsorption tests with Cd(II) indicate that pseudo-second order and Langmuir models best fitted experimental data, with a maximum adsorption capacity of 591 mg/g at 25 C. Adsorption with multielement samples containing Cr(VI), Cu(II), Cd(II), and Pb(II) also reveal their capability to remove them in a selective way. This mechanically resistant, hydrophilic, and permeable adsorbent media was able to capture both cationic and anionic metallic contaminants.

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Cadmium sorption characteristics of phosphorylated sago starch-extraction residue

Cited by 20 publications

References 40 publications

Phosphated Cellulose as an Efficient Biomaterial for Aqueous Drug Ranitidine Removal

Phosphated Cellulose as an Efficient Biomaterial for Aqueous Drug Ranitidine Removal

Selective sorption of heavy metal on phosphorylated sago starch‐extraction residue

Phosphorylated cellulose/electrospun chitosan nanofibers media for removal of heavy metals from aqueous solutions

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